[wasm R2R] Assert failure: codeLength > 0 #131924

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1. VincentBu

   added

   blocking-outerloopBlocking the 'runtime-coreclr outerloop' and 'runtime-libraries-coreclr outerloop' runsBlocking the 'runtime-coreclr outerloop' and 'runtime-libraries-coreclr outerloop' runs

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4. jkotas

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   arch-wasmWebAssembly architectureWebAssembly architecture

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5. dotnet-policy-service commented on Aug 6, 2026

   

   dotnet-policy-serviceBot

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   Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
   See info in area-owners.md if you want to be subscribed.
6. jkotas

   changed the title [-]Assert failure: codeLength > 0[/-] [+][wasm R2R] Assert failure: codeLength > 0[/+] on Aug 6, 2026
7. AndyAyersMS

   self-assigned this

   on Aug 7, 2026
8. AndyAyersMS commented on Aug 7, 2026

   

   AndyAyersMS

   on Aug 7, 2026

   Last edited by AndyAyersMS

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   Leaf methods have no VIP updates so were reporting in unwind as having zero length. But this messes up range-based IP lookups, as now multiple functions can "cover" a given global VIP ... one nonzero-length and some number of zero length.

   Fix is to never report a function as zero length. It is ok to over-estimate the VIP range. Will have a PR up shortly

   No, that's not the problem, we already report nonzero length. The problem lies elsewhere. It has something to do with having composite images in the process -- seems like intra-composite calls are bypassing GetEntryPoint and so not setting up the right runtime VIP data.

   Probably best to leave this one for @davidwrighton's return.
9. AndyAyersMS

   added this to the 11.0.0 milestone on Aug 7, 2026
10. AndyAyersMS

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    untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

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11. VincentBu commented on Aug 10, 2026

    

    VincentBu

    on Aug 10, 2026

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    Failed in: runtime-coreclr outerloop 20260809.3

    Failed tests:

    coreclr browser wasm Checked @ (Ubuntu.2604.Amd64.Open)[email protected]/dotnet-buildtools/prereqs:ubuntu-26.04-helix-webassembly-amd64@sha256:0be8725e08b6d0f58ec0290f3f3b70c449123e78b2b33853e9049df84b912fa8
    - readytorun/fieldlayout/fieldlayout/fieldlayout.cmd
    coreclr browser wasm Checked no_tiered_compilation @ (Ubuntu.2604.Amd64.Open)[email protected]/dotnet-buildtools/prereqs:ubuntu-26.04-helix-webassembly-amd64@sha256:0be8725e08b6d0f58ec0290f3f3b70c449123e78b2b33853e9049df84b912fa8
    - readytorun/fieldlayout/fieldlayout/fieldlayout.cmd
    
    

    Error message:

    Out-of-process wrapper failed with exit code 1.
    BEGIN EXECUTION
    in takeLock
    19:17:25
    Response file: /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/composite-r2r.wasm.rsp
    /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/IL-CG2/fieldlayout.dll
    /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/IL-CG2/TestLibrary.dll
    -o:/root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/composite-r2r.wasm
    -O
    --targetarch:wasm
    --targetos:browser
    --verify-type-and-field-layout
    --method-layout:random
    --codegenopt:JitWasmNyiToR2RUnsupported=1
    -r:/root/helix/work/correlation/System.*.dll
    -r:/root/helix/work/correlation/Microsoft.*.dll
    -r:/root/helix/work/correlation/xunit.*.dll
    -r:/root/helix/work/correlation/mscorlib.dll
    -r:/root/helix/work/correlation/netstandard.dll
    Running CrossGen2:  /root/helix/work/correlation/crossgen2/crossgen2 @/root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/composite-r2r.wasm.rsp  --composite   -f wasm
    Emitting R2R Wasm file: /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/composite-r2r.wasm
    Emitting R2R Wasm file: /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/fieldlayout.wasm
    Emitting R2R Wasm file: /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/TestLibrary.wasm
    Running R2RDump:  dotnet /root/helix/work/correlation/R2RDump/R2RDump.dll --header --sc --in /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/fieldlayout.wasm --out /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/fieldlayout.wasm.r2rdump --val --rp /root/helix/work/correlation
    Running R2RDump:  dotnet /root/helix/work/correlation/R2RDump/R2RDump.dll --header --sc --in /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/TestLibrary.wasm --out /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/TestLibrary.wasm.r2rdump --val --rp /root/helix/work/correlation
    19:17:25
    in ReleaseLock
    in takeLock
    in ReleaseLock
    in takeLock
    Running with node
    CORE_ROOT: /root/helix/work/correlation
    ExePath: /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/fieldlayout.dll
    CLRTestExecutionArguments:
    node version: v23.11.1
    Timeout in ms: 900000
    Running: node --experimental-wasm-exnref --stack-size=8192 /root/helix/work/correlation/corerun.js -c /root/helix/work/correlation -p System.Reflection.Metadata.MetadataUpdater.IsSupported=false -p System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true /root/helix/work/workitem/e/readytorun/fieldlayout/fieldlayout/fieldlayout.dll
    ASSERT FAILED
    	Expression: codeLength > 0
    	Location:   /__w/1/s/src/coreclr/vm/eetwain.cpp:1634
    	Function:   GetFunctionSize
    	Process:    42
    Frame (InlinedCallFrame): 0x4fe9dc
        Skipping 0x4fe9dc
    Frame (PrestubMethodFrame): 0x4fec5c
        Skipping 0x4fec5c
    Frame (PrestubMethodFrame): 0x4fef3c
        Skipping 0x4fef3c
    Frame (PrestubMethodFrame): 0x4ff20c
        Skipping 0x4ff20c
    Frame (PrestubMethodFrame): 0x4ff4ec
        Skipping 0x4ff4ec
    ASSERT FAILED
    	Expression: IsExecutingOnAltStack() || (curSP <= m_pFrame && m_pFrame < m_CacheStackBase) || m_pFrame == (Frame*) -1
    	Location:   /__w/1/s/src/coreclr/vm/threads.h:1134
    	Function:   GetFrame
    	Process:    42
    Frame (InlinedCallFrame): 0x4fe9dc
        Skipping 0x4fe9dc
    Frame (PrestubMethodFrame): 0x4fec5c
        Skipping 0x4fec5c
    Frame (PrestubMethodFrame): 0x4fef3c
        Skipping 0x4fef3c
    Frame (PrestubMethodFrame): 0x4ff20c
        Skipping 0x4ff20c
    Frame (PrestubMethodFrame): 0x4ff4ec
        Skipping 0x4ff4ec
    Aborted(native code called abort())
    wasm://wasm/01bde4b6:1
    
    
    RuntimeError: unreachable
        at wasm://wasm/01bde4b6:wasm-function[18584]:0x5d4650
        at abort (file:///root/helix/work/correlation/corerun.js:482:5)
        at __abort_js (file:///root/helix/work/correlation/corerun.js:6267:24)
        at wasm://wasm/01bde4b6:wasm-function[101]:0x9af9
        at wasm://wasm/01bde4b6:wasm-function[190]:0xf662
        at wasm://wasm/01bde4b6:wasm-function[252]:0x10be2
        at wasm://wasm/01bde4b6:wasm-function[256]:0x10
    

    Stack trace:

       at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 135
       at Xunit.Assert.True(Boolean condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 117
       at TestLibrary.OutOfProcessTest.ImportPrecomputedResult(String assemblyPath, String testPathPrefix) in /__w/1/s/src/tests/Common/CoreCLRTestLibrary/OutOfProcessTest.cs:line 285
       at TestLibrary.OutOfProcessTest.RunOutOfProcessTest(String assemblyPath, String testPathPrefix) in /__w/1/s/src/tests/Common/CoreCLRTestLibrary/OutOfProcessTest.cs:line 84
       at Program.<<Main>$>g__TestExecutor7|0_8(StreamWriter tempLogSw, StreamWriter statsCsvSw, StreamWriter outOfProcessPlanWriter, <>c__DisplayClass0_0&)
    
12. AndyAyersMS

    assigned

    davidwrighton

    and unassigned

    AndyAyersMS

    on Aug 10, 2026
13. davidwrighton

    closed this as completedin #132172on Aug 12, 2026
14. pull

    added a commit that references this issue on Aug 12, 2026

    Fix WASM R2R virtual IP initialization (dotnet#132172)

    ...

    This issue will close once commit 6190b8e is merged into the 'main' branch.

    6190b8e
15. pavelsavara

    added a commit that references this issue on Aug 19, 2026

    JIT: Guard named intrinsic lookup

    ...

    This issue will close once commit fa5fd36 is merged into the 'main' branch.

    fa5fd36
16. AndyAyersMS

    added a commit that references this issue on Aug 19, 2026

    JIT: Guard named intrinsic lookup (#132523)

    ...

    This issue will close once commit 28b604a is merged into the 'main' branch.

    28b604a
17. github-actions

    locked and limited conversation to collaborators on Sep 12, 2026