Assertion failed '!"Unexpected well known arg to method GDV candidate"

https://dev.azure.com/dnceng-public/public/_build/results?buildId=1266373&view=ms.vss-test-web.build-test-results-tab&runId=35337768&resultId=209882&paneView=dotnet-dnceng.dnceng-build-release-tasks.helix-test-information-tab

windows x64 fullpgo method profiling

set DOTNET_TieredCompilation=1
set DOTNET_ReadyToRun=0
set DOTNET_TC_QuickJitForLoops=1
set DOTNET_TieredPGO=1
set DOTNET_JitDelegateProfiling=1
set DOTNET_JitVTableProfiling=1

  Discovering: System.Text.Json.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Text.Json.Tests (found 10198 of 10271 test cases)
  Starting:    System.Text.Json.Tests (parallel test collections = on [4 threads], stop on fail = off)

Assert failure(PID 44644 [0x0000ae64], Thread: 22492 [0x57dc]): Assertion failed '!"Unexpected well known arg to method GDV candidate"' in 'JsonSerializerApiValidation:<SerializeNullException>b__9_1():this' during 'Importation' (IL size 25; hash 0xed53ad00; Tier1)

    File: D:\a\_work\1\s\src\coreclr\jit\importercalls.cpp:7446
    Image: C:\h\w\AB6F09F9\p\dotnet.exe

@JulieLeeMSFT

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@hez2010

Also several failures in net11.0-windows-Release-x64-fullpgo_random_gdv_methodprofiling_only-Windows.10.Amd64.Open

DOTNET_JitClassProfiling=0
DOTNET_JitDelegateProfiling=1
DOTNET_JitRandomGuardedDevirtualization=1
DOTNET_JitRandomlyCollect64BitCounts=1
DOTNET_JitVTableProfiling=1
DOTNET_ReadyToRun=0
DOTNET_TC_QuickJitForLoops=1
DOTNET_TieredCompilation=1
DOTNET_TieredPGO=1

  Discovering: System.IO.Compression.Brotli.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.IO.Compression.Brotli.Tests (found 109 of 120 test cases)
  Starting:    System.IO.Compression.Brotli.Tests (parallel test collections = on [4 threads], stop on fail = off)

Assert failure(PID 16680 [0x00004128], Thread: 14112 [0x3720]): Assertion failed '!"Unexpected well known arg to method GDV candidate"' in 'System.IO.Compression.CompressionStreamUnitTestBase:RoundTripWithZLibCompressionOptions(System.String,System.IO.Compression.ZLibCompressionOptions):this' during 'Importation' (IL size 176; hash 0x03f009b8; Tier1-OSR)

    File: D:\a\_work\1\s\src\coreclr\jit\importercalls.cpp:7446

Maybe related to #123434? -- fyi @hez2010

@jakobbotsch

I just took a deeper look. The well-known arg here is AsyncContinuation.
We are trying to GDV an async call System.IO.Stream:DisposeAsync.

I believe it's related to #123448 as it enabled runtime async for all library tests.

cc @jakobbotsch

@hez2010

Thanks for looking @hez2010! This is just missing a switch case I think.

Fix JIT assertion for AsyncContinuation in GDV compatibility check (#…

Fix JIT assertion for AsyncContinuation in GDV compatibility check (d…

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Assertion failed '!"Unexpected well known arg to method GDV candidate" #123653

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Assertion failed '!"Unexpected well known arg to method GDV candidate" #123653

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dotnet-policy-service commented on Jan 27, 2026

AndyAyersMS commented on Jan 27, 2026

hez2010 commented on Jan 27, 2026

hez2010 commented on Jan 27, 2026

jakobbotsch commented on Jan 27, 2026

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