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JIT: Assertion failed '(refPosition->refType == RefTypeUpperVectorRestore) || (genCountBits(candidates) == 1)' during 'LSRA build intervals' #85426

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jakobbotsch opened this issue Apr 26, 2023 · 3 comments · Fixed by #85566
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JIT: Assertion failed '(refPosition->refType == RefTypeUpperVectorRestore) || (genCountBits(candidates) == 1)' during 'LSRA build intervals' #85426

jakobbotsch opened this issue Apr 26, 2023 · 3 comments · Fixed by #85566
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@kunalspathak
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arch-arm64 area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI blocking-clean-ci-optional Blocking optional rolling runs JitStress CLR JIT issues involving JIT internal stress modes
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8.0.0

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@jakobbotsch
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libraries-jitstress is hitting this in a few jobs, for example https://dev.azure.com/dnceng-public/public/_build/results?buildId=252833&view=ms.vss-test-web.build-test-results-tab&runId=4908054&resultId=177607&paneView=debug

Assert failure(PID 28 [0x0000001c], Thread: 396 [0x018c]): Assertion failed '(refPosition->refType == RefTypeUpperVectorRestore) || (genCountBits(candidates) == 1)' in 'System.Buffers.ProbabilisticMap:IndexOfAnyVectorized(byref,byref,int,System.ReadOnlySpan`1[ushort]):int' during 'LSRA build intervals' (IL size 203; hash 0x36e94114; Tier1)

    File: /__w/1/s/src/coreclr/jit/lsra.cpp Line: 12346
    Image: /root/helix/work/correlation/dotnet

I was able to get a partial jitdump (it hit segfault after printing this) which I've attached.

out.txt
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Apr 26, 2023
@ghost ghost added the untriaged New issue has not been triaged by the area owner label Apr 26, 2023
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ghost commented Apr 26, 2023

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

libraries-jitstress is hitting this in a few jobs, for example https://dev.azure.com/dnceng-public/public/_build/results?buildId=252833&view=ms.vss-test-web.build-test-results-tab&runId=4908054&resultId=177607&paneView=debug

Assert failure(PID 28 [0x0000001c], Thread: 396 [0x018c]): Assertion failed '(refPosition->refType == RefTypeUpperVectorRestore) || (genCountBits(candidates) == 1)' in 'System.Buffers.ProbabilisticMap:IndexOfAnyVectorized(byref,byref,int,System.ReadOnlySpan`1[ushort]):int' during 'LSRA build intervals' (IL size 203; hash 0x36e94114; Tier1)

    File: /__w/1/s/src/coreclr/jit/lsra.cpp Line: 12346
    Image: /root/helix/work/correlation/dotnet

I was able to get a partial jitdump (it hit segfault after printing this) which I've attached.

out.txt

Author: jakobbotsch
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area-CodeGen-coreclr
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@jakobbotsch jakobbotsch added blocking-clean-ci-optional Blocking optional rolling runs JitStress CLR JIT issues involving JIT internal stress modes and removed untriaged New issue has not been triaged by the area owner labels Apr 26, 2023
@jakobbotsch jakobbotsch mentioned this issue Apr 26, 2023
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@BruceForstall BruceForstall added this to the 8.0.0 milestone Apr 27, 2023
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New assert related to arm64 consecutive registers support.

@kunalspathak
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I will take a look.

@jakobbotsch jakobbotsch mentioned this issue Apr 27, 2023
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@kunalspathak kunalspathak mentioned this issue Apr 30, 2023
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arch-arm64 area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI blocking-clean-ci-optional Blocking optional rolling runs JitStress CLR JIT issues involving JIT internal stress modes
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Do not set pre-decided consecutive registers as busy (again) kunalspathak/runtime
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@jakobbotsch @BruceForstall @kunalspathak