[Bug]: Racing `container build` commands can fail on buildkit container cold start. · Issue #2001 · apple/container

I have done the following

I have searched the existing issues
If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out.

We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests.

Build lifecycle tests remain serial.

Problem description

With build tests moved to the parallel pass:

rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration

Errors:

 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues.

Environment

- OS: 26
- Xcode: 26
- Container: main

Code of Conduct

I agree to follow this project's Code of Conduct

blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks"); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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Please reload this page. apple /containerPublic Notifications You must be signed in to change notification settings Fork 1.8k Star 49.6k Code Issues310 Pull requests202 Discussions Actions Projects Security and quality6 Insights Additional navigation options Code Issues Pull requests Discussions Actions Projects Security and quality Insights [Bug]: Racing container build commands can fail on buildkit container cold start. #2001 Copy link Copy link Closed Bug #2002 Closed [Bug]: Racing container build commands can fail on buildkit container cold start.#2001 Bug #2002 Copy link Assignees Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Milestone 2026-07 Description jglogan opened on Jul 23, 2026 Issue body actions I have done the following I have searched the existing issues If possible, I've reproduced the issue using the 'main' branch of this project Steps to reproduce When running experiments to parallelize the container build CLI integration tests, the first builds tend to fail because all are trying to start the builder, and the case of the builder existing simply errors out. We should handle this error gracefully, and ensure that it's handled properly by parallelizing build tests. Build lifecycle tests remain serial. Problem description With build tests moved to the parallel pass: rm -rf ./test-logs ./test-temp ; make APP_ROOT=./test-data LOG_ROOT=./test-logs PRESERVE_KERNELS=true all test integration Errors: Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:65:17: Expectation failed: (result.status → 1) == 0􀄵 build with tar export to directory should succeed􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:67:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 tar file should exist at out.tar􀢄 Test testBuildExportTarToDirectory() recorded an issue at TestCLIBuilderTarExport.swift:70:17: Expectation failed: (result.output → "").contains(expectedTar.string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarToDirectory-4ac0172e/C3A8E163-F776-4CE6-AECE-35677254FE6E/exports/out.tar")􀄵 output should reference out.tar􁁛 Test testInitImageFlagInHelp() passed after 117.908 seconds.􀢄 Test testBuildExportTarToDirectory() failed after 118.459 seconds with 3 issues.􁁛 Test testStartIdempotent() passed after 118.709 seconds.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:96:17: Expectation failed: (r1.status → 1) == 0􀄵 first build should succeed􀢄 Test testBuildExportTarInvalidDest() recorded an issue at TestCLIBuilderTarExport.swift:121:17: Expectation failed: (result.error → "Warning! Running debug build. Performance may be degraded.Error: internalError: "failed to create container" (cause: "exists: "container already exists: buildkit"")").contains("dest field is required")􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:97:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar")􁁛 Test testAnonymousVolumeMixedWithNamedVolume() passed after 118.811 seconds.􀢄 Test testBuildExportTarInvalidDest() failed after 118.968 seconds with 1 issue.􀢄 Test testBuildExportTarMultipleRuns() recorded an issue at TestCLIBuilderTarExport.swift:101:17: Expectation failed: (FileManager.default → <NSFileManager: 0x10512afc0>).fileExists(atPath: exportDir.appending("out.tar.1").string → "/Users/john/projects/jglogan/container/.test-scratch/testBuildExportTarMultipleRuns-53e71eb8/B9AD16A3-DD1E-430E-8571-CE268A5E9993/exports/out.tar.1")􀄵 second tar should exist at out.tar.1􁁛 Test testExecDetachProcessRunning() passed after 119.000 seconds.􀢄 Test testBuildExportTarMultipleRuns() failed after 119.153 seconds with 3 issues. Environment - OS: 26 - Xcode: 26 - Container: main Code of Conduct I agree to follow this project's Code of Conduct Reactions are currently unavailable Metadata Metadata Assignees jglogan Labels builderIssues and features associated with container image buildingIssues and features associated with container image building Type Bug Projects No projects Milestone 2026-07 Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time.