[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

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stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
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[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
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stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

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stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

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stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

@stephentoub
stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

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stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

@stephentoub
stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

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Needs package authoring.

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LGTM

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Thanks for taking care of the package authoring, @ericstj.

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stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
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stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

@ericstj

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Needs package authoring.

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LGTM

@stephentoub

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Thanks for taking care of the package authoring, @ericstj.

@stephentoub
stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
@stephentoub
stephentoub deleted the backport99632 branch May 29, 2024 01:41
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, '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 content

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync - #102376

Merged
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632
May 29, 2024
Merged

[release/8.0] Fix cancellation unregistration in DataflowBlock.OutputAvailableAsync#102376
stephentoub merged 2 commits into
dotnet:release/8.0-stagingfrom
stephentoub:backport99632

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OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.

The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.

Backport of #99632

Customer Impact

Unbounded memory growth if a long-lived CancellationToken is used with OutputAvailableAsync; each call would end up rooting a small object into the token.

Testing

Normal CI testing, plus local stress testing to show that the leak no longer exists.

Risk

Low

…dotnet#99632)
OutputAvailableAsync is not unregistering from the supplied CancellationToken. If a cancelable token is supplied and is long lived, each call with that token to OutputAvailableAsync will add another callback into that token, and that will continue to grow until either the token is dropped or has been cancellation requested. For a long-lived cancellation token, this is akin to a leak.
The implementation was trying to be too clever in avoiding an additional continuation that was previously there. However, this continuation makes it a lot easier to avoid possible deadlocks that can occur if a cancellation request comes in concurrently with a message being pushed. Instead of trying to avoid it, just use an async method, which still incurs the extra task but does so with less allocation and greatly simplifies the code while also fixing the issue, as all cleanup can now be done in the continuation as part of the async method.
@stephentoubstephentoub added the Servicing-consider Issue for next servicing release review label May 17, 2024
@stephentoubstephentoub added this to the 8.0.x milestone May 17, 2024
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@ericstjericstj added Servicing-approved Approved for servicing release and removed Servicing-consider Issue for next servicing release review labels May 22, 2024
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Approved in mail.

@ericstj

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Needs package authoring.

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LGTM

@stephentoub

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Thanks for taking care of the package authoring, @ericstj.

@stephentoub
stephentoub merged commit 48a9496 into dotnet:release/8.0-stagingMay 29, 2024
@stephentoub
stephentoub deleted the backport99632 branch May 29, 2024 01:41
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