Place async resumption info in read-write section outside Windows for AOT by jakobbotsch · Pull Request #123433 · dotnet/runtime

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch · 2026-01-21T14:05:29Z

ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that #123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary.

Fix#121871

Rework `allocMem` to support allocating an arbitrary number of data chunks. The motivation is to allow ilc to put async resumption info chunks into sections that support relocations to .text, but additionally will allow for sharing read only data between multiple functions.

This reverts commit 056f51b.

jakobbotsch · 2026-02-01T11:57:08Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-01T11:57:24Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-02T14:23:56Z

Looks like there are some failures to investigate.

jakobbotsch · 2026-02-02T14:35:57Z

I think we are already running into the problem above (#123433 (comment)). Basically JIT assumes that constant data will be close and generates code/relocs to load the address of the resumption info as if that is the case.

Copilot

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

jakobbotsch · 2026-02-02T20:57:25Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2026-02-02T20:57:43Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2026-02-03T11:58:55Z

+ {
+ emitRecordRelocation(dst - sizeof(code_t), dstAddr, CorInfoReloc::ARM64_PAGEBASE_REL21);
+ }



cc @shushanhf @dotnet/samsung. You likely will need a similar change for loongarch64 and RISCV64.
In summary we can now have data that is not allocated together with the code so for those you will need to emit relocs.

Thanks, I will do it.

jakobbotsch · 2026-02-03T12:00:53Z

/ba-g x64 infra timeouts -- these jobs succeeded on the previous run with only arm64 changes since them

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

… reference dotnet#123433.

… AOT (dotnet#123433) ELF/MachO do not support relocations from read-only sections into the .text section. We generate such relocations when creating async resumption info. Now that dotnet#123378 is in we can teach ilc/crossgen2 to place these pieces of data in a read-write section when necessary. Fixdotnet#121871

jakobbotsch added 12 commits January 20, 2026 14:31

Fix some docs, do some CSEs
e8abae4

Bump JIT-EE GUID
2b64b66

Fix RISCV64/LA64 builds
2a2eee9

Fix alignment for interpreter allocation
e173739

Use "1" alignment for "default" alignment
5989a20

Use binary search for emitDataOffsetToPtr
bda074b

Run jit-format
843c87b

Fix build
7506a46

Remove functional change
056f51b

Revert "Remove functional change"
f0b7e8a
This reverts commit 056f51b.

Place async resumption info in read-write section outside Windows
e2f56c0

github-actionsBot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jan 21, 2026

dotnet-policy-serviceBot assigned jakobbotsch Jan 21, 2026

New ClassCode
1b06d01

jakobbotsch mentioned this pull request Jan 22, 2026
Add allocMem support for allocating multiple data chunks #123378
Merged

jkotas mentioned this pull request Jan 24, 2026
Runtime-async Exception.ToString() #122722
Merged

jakobbotsch mentioned this pull request Jan 27, 2026
Run async tests on native AOT ARM64 #123668
Closed

jakobbotsch added 3 commits January 27, 2026 14:57

Merge branch 'main' of github.com:dotnet/runtime into fix-121871-2
438a9d4

Resolve conflicts, enable async tests on NAOT arm64
01cb4ac

Fix bad merge
6a813a1

jakobbotsch closed this Jan 27, 2026

jakobbotsch reopened this Jan 27, 2026

build-analysisBot mentioned this pull request Jan 28, 2026
[Wasm] The request was canceled due to the configured HttpClient.Timeout of 100 seconds elapsing #123572
Open

jakobbotsch closed this Jan 28, 2026

jakobbotsch reopened this Jan 28, 2026

jakobbotsch marked this pull request as ready for review January 28, 2026 17:22

build-analysisBot mentioned this pull request Jan 30, 2026
XHarness package install failure on iOS due to devicectl NSPOSIXErrorDomain error 49 #123796
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EgorBo approved these changes Jan 31, 2026
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This was referenced Feb 1, 2026
Unable to pull image from mcr.microsoft.com #117164
Closed
Test failure: GC/API/GC/GetTotalAllocatedBytes/GetTotalAllocatedBytes.cmd #121482
Closed

jakobbotsch added 2 commits February 2, 2026 16:14

Merge branch 'main' of github.com:dotnet/runtime into fix-121871-2
5dd427f

Emit relocs for resumption info addresses
ab929cc

CopilotAI review requested due to automatic review settings February 2, 2026 19:00

Copilotstarted reviewing on behalf of jakobbotsch February 2, 2026 19:01 View session

CopilotAI reviewed Feb 2, 2026
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build-analysisBot mentioned this pull request Feb 3, 2026
[android] Android.Device_Emulator.JIT.Test failing on emulators with CoreCLR #112633
Open

jakobbotsch commented Feb 3, 2026
View reviewed changes

jakobbotsch merged commit 1bea004 into dotnet:mainFeb 3, 2026
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jakobbotsch deleted the fix-121871-2 branch February 3, 2026 12:05

EgorBo mentioned this pull request Feb 3, 2026
JIT: Standardize Compiler* field naming to m_compiler #123926
Merged

shushanhf added a commit to shushanhf/runtime that referenced this pull request Feb 4, 2026
[LoongArch64] Place async resumption info in read-write section which…
beda21f
… reference dotnet#123433.

dotnet-maestroBot mentioned this pull request Feb 5, 2026
[main] Source code updates from dotnet/runtime dotnet/dotnet#4680
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jakobbotsch mentioned this pull request Feb 5, 2026
MacOS arm64 NAOT runtime-async - bad ResumeInfo written (causing failure on StackTraceTests) #124015
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shushanhf added a commit to shushanhf/runtime that referenced this pull request Feb 10, 2026
[LoongArch64] Place async resumption info in read-write section which…
9d18d82
… reference dotnet#123433.

shushanhf mentioned this pull request Feb 10, 2026
[LoongArch64] Place async resumption info in read-write section which reference #123433 #124213
Merged

shushanhf added a commit to shushanhf/runtime that referenced this pull request Feb 10, 2026
[LoongArch64] Place async resumption info in read-write section which…
4913f41
… reference dotnet#123433.

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