coreclr debug session ends silently on x64 Linux when debugging application with large assembly load — vsdbg DBI-Callback thread crashes in libmscordaccore.so

[fraguada]

Type: Bug

Issue Description

Environment:

• Extension: ms-dotnettools.csharp 2.130.5 (linux-x64)
• vsdbg: ~/.vscode/extensions/ms-dotnettools.csharp-2.130.5-linux-x64/.debugger/vsdbg
• .NET: 9.0.3 (also reproduced with 9.0.1 and 9.0.2)
• OS: Ubuntu 24.04 x86_64

A coreclr launch configuration exits silently — no terminated or exited event, no error in the Debug Console — when the target .NET 9 application loads a large number of assemblies at runtime (~316 managed assemblies + many native .so libraries via a third-party SDK). With "engineLogging": true, the session stops producing output after the last assembly load notification; no further protocol messages are received from vsdbg.

The target process itself continues running normally — only vsdbg is affected.

sudo dmesg reveals the cause — vsdbg's own DBI-Callback thread crashing inside libmscordaccore.so:

[  778.946248] DBI-Callback[10410]: segfault at 0 ip 00007bcc8ce067b5 sp 00007bcc8cbfc940 error 4 in libmscordaccore.so[2057b5,7bcc8ccae000+1a5000] likely on CPU 9 (core 9, socket 0)
[  778.946259] Code: 0a e4 ff 48 63 0c 8a 48 01 d1 ff e1 4c 8b 6d d0 49 8b bd 98 00 00 00 48 89 7d a0 be 08 00 00 00 ba 01 00 00 00 e8 6b 96 f2 ff <48> 8b 00 49 89 44 dd 78 48 8b 45 c8 48 85 c0 74 0c 48 8b 4d a0 48
[ 1993.518127] DBI-Callback[18733]: segfault at 0 ip 00007acf156067b5 sp 00007acf153fc940 error 4 in libmscordaccore.so[2057b5,7acf154ae000+1a5000] likely on CPU 9 (core 9, socket 0)
[ 1993.518136] Code: 0a e4 ff 48 63 0c 8a 48 01 d1 ff e1 4c 8b 6d d0 49 8b bd 98 00 00 00 48 89 7d a0 be 08 00 00 00 ba 01 00 00 00 e8 6b 96 f2 ff <48> 8b 00 49 89 44 dd 78 48 8b 45 c8 48 85 c0 74 0c 48 8b 4d a0 48
[ 2021.466030] DBI-Callback[19191]: segfault at 0 ip 000072f9e04067b5 sp 000072f9c6ffa940 error 4 in libmscordaccore.so[2057b5,72f9e02ae000+1a5000] likely on CPU 8 (core 8, socket 0)
[ 2021.466041] Code: 0a e4 ff 48 63 0c 8a 48 01 d1 ff e1 4c 8b 6d d0 49 8b bd 98 00 00 00 48 89 7d a0 be 08 00 00 00 ba 01 00 00 00 e8 6b 96 f2 ff <48> 8b 00 49 89 44 dd 78 48 8b 45 c8 48 85 c0 74 0c 48 8b 4d a0 48

• Faulting instruction 48 8b 00 = MOV RAX, [RAX] — null dereference in vsdbg's DBI-Callback thread
• All three crashes are at identical offset 2057b5 with byte-for-byte identical faulting code — fully deterministic
• Two of the three crashes occurred with justMyCode: true — the setting has no effect on the crash
• The crash was also observed with .NET 9.0.1 at offset 2056d5

Attempted configuration mitigations (none successful):

• justMyCode: true — no effect, crash still occurs (verified in dmesg)
• DOTNET_DbgEnableMiniDump: "0" — no effect
• enableStepFiltering: false — no effect

Steps to Reproduce

Not reproducible:
While I can reproduce this on different x86_64 systems with my application, I have not been able to create a reproduction that I can share. I tried loading many dynamic assemblies, or assemblies from disk, and vsdbg worked fine.
This has been an issue for two or three years with my application, and it is why my dev environment is arm64, since debugging works fine there with the same application and setup.

• "type": "lldb" on the same binary — works correctly
• linux-arm64 with the arm64 extension build (ms-dotnettools.csharp-2.130.5-linux-arm64) — coreclr debugging works correctly there with the same application

Two issues here:

• The crash in libmscordaccore.so is a runtime/DAC bug — filed at [https://github.com/libmscordaccore.so null pointer dereference in DBI-Callback thread on x64 Linux (.NET 9, all patches) runtime#126081]
• vsdbg should catch crashes in its own internal threads (such as DBI-Callback) and report a meaningful error to the user rather than silently dropping the debug session with no event or message

Expected Behavior

vsdbg should not crash on x86_64

Actual Behavior

vsdbg crashes on x86_64

Workaround

Use "type": "lldb" in the VS Code launch configuration until upstream is fixed. Alternatively, debug on linux-arm64 — the arm64 build of vsdbg (ms-dotnettools.csharp-2.130.5-linux-arm64) does not exhibit this crash and coreclr debugging works correctly there with the same application.

Extension version: 2.130.5
VS Code version: Code 1.112.0 (07ff9d6178ede9a1bd12ad3399074d726ebe6e43, 2026-03-17T18:09:23Z)
OS version: Linux x64 6.17.0-1012-oem snap
Modes:

Logs

C# LSP Trace Logs log

Details

Environment Information

VSCode version: 1.112.0
C# Extension: 2.130.5
Using OmniSharp: false

Dotnet Information

Host:
Version: 10.0.5
Architecture: x64
Commit: a612c2a105
RID: linux-x64

.NET SDKs installed:
No SDKs were found.

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.5 [/home/fraguada/.config/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/10.0.5x64aspnetcore/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.5 [/home/fraguada/.config/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/10.0.5x64aspnetcore/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_CLI_UI_LANGUAGE [en-US]
DOTNET_MULTILEVEL_LOOKUP [0]
DOTNET_NOLOGO [true]
DOTNET_ROOT [/usr/share/dotnet]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
cmake-tools	ms-vscode	1.22.28	ms-vscode.cmake-tools-1.22.28
copilot-chat	GitHub	0.40.1	github.copilot-chat-0.40.1
cpp-devtools	ms-vscode	0.4.6	ms-vscode.cpp-devtools-0.4.6
cpptools	ms-vscode	1.30.5	ms-vscode.cpptools-1.30.5-linux-x64
cpptools-extension-pack	ms-vscode	1.5.1	ms-vscode.cpptools-extension-pack-1.5.1
cpptools-themes	ms-vscode	2.0.0	ms-vscode.cpptools-themes-2.0.0
csdevkit	ms-dotnettools	3.10.4	ms-dotnettools.csdevkit-3.10.4-linux-x64
csharp	ms-dotnettools	2.130.5	ms-dotnettools.csharp-2.130.5-linux-x64
gitblame	waderyan	12.1.0	waderyan.gitblame-12.1.0
remote-explorer	ms-vscode	0.5.0	ms-vscode.remote-explorer-0.5.0
vscode-catch2-test-adapter	matepek	4.22.3	matepek.vscode-catch2-test-adapter-4.22.3
vscode-containers	ms-azuretools	2.4.1	ms-azuretools.vscode-containers-2.4.1
vscode-docker	ms-azuretools	2.0.0	ms-azuretools.vscode-docker-2.0.0
vscode-dotnet-runtime	ms-dotnettools	3.0.0	ms-dotnettools.vscode-dotnet-runtime-3.0.0
vscode-lldb	vadimcn	1.12.1	vadimcn.vscode-lldb-1.12.1

C# Settings

Setting	Value
preferCSharpExtension	false
compilerDiagnosticScope	openFiles
analyzerDiagnosticScope	openFiles
enableXamlTools	true
useServerGC	true

System Info

Item	Value
CPUs	Intel(R) Core(TM) Ultra 9 285 (24 x 1716)
GPU Status	2d_canvas: unavailable_software GPU0: VENDOR= 0xffff [Google Inc. (Google)], DEVICE=0xffff [ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver-5.0.0)], DRIVER_VENDOR=SwANGLE, DRIVER_VERSION=5.0.0 ACTIVE Machine model name: Machine model version: direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: disabled_off webnn: unavailable_software
Load (avg)	1, 1, 1
Memory (System)	125.13GB (112.15GB free)
Process Argv	--no-sandbox --force-user-env --ozone-platform=x11 --crash-reporter-id f43cb1d1-2757-43d3-bde8-b6076bc53f4d
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	ubuntu:GNOME
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

A/B Experiments

vsliv368cf:30146710
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
6abeh943:31336334
envsdeactivate2:31464701
cloudbuttont:31379625
aihoversummaries_f:31469309
3efgi100_wstrepl:31403338
56b7f661:31457055
use-responses-api:31390855
je187915:31401257
ec5jj548:31422691
cp_cls_t_966_ss:31454198
4je02754:31466945
find_all_ref_in_bg_f:31469307
8hhj4413:31478653
ge8j1254_inline_auto_hint_haiku:31431912
38bie571_auto:31478677
cp_cls_c_1081:31454833
ia-use-proxy-models-svc:31452481
e9c30283:31461165
test_treatment2:31471001
ts_provider_enabled:31458190
control_6dc23131:31467998
idci7584:31464702
showingstats:31481873
534a6447:31478749
nes-extended-on:31455476
chat:31457767
8hig5102:31480529
8a2c4887_5_3_codex_prompt:31475326
bg_compact_c:31481651
c-off:31481340
cpptoolsoff-v2:31475362
hover1:31474145
db0gd219:31481871
po_split_t:31481793
ddid_c:31478207
getcmakediagnosticsoff:31481767
nes-perm-reb-1:31481660

[gregg-miskelly]

@fraguada to do anything with this issue (and I am guessing the .NET issue) we would need at least a symbolized call stack, though a coredump would be more helpful.

Two possible ways to gather a core dump:

1: .NET dump environment variables

If you start VS Code with the .NET Dump environment, I believe these will get inherited by vsdbg/vsdbg-ui.

Something like:

export DOTNET_DbgMiniDumpName='/example/folder/here/%e-%p.core'
export DOTNET_DbgEnableMiniDump=1

2: ulimit

If you change the way you are debugging with vsdbg to set the following in your launch.json:

{
   "version": "0.2.0",
   "configurations": [
        {
            "debugServer": 4711,
            "console": "internalConsole"
            "...": "...",
        },
        { "...": "..." }
    ]
}

Then you can have VS Code connect to a vsdbg-ui process that you started. So, you can do so in a shell with ulimit and core_pattern set so that Linux will write out a coredump.

Once you have a core dump, if you are using a version of .NET compiled by Microsoft you can use the dotnet-symbol global tool to download matching symbols, and then load the dump using lldb or GDB (or the VS code extensions that use them such as the C++ extension). If you are using a version of the .NET Runtime compiled by someone else (example: Canonical's version) then I am not sure how to download symbols.

[fraguada]

@gregg-miskelly That took a bit of poking around to figure it out. Is this of any use?

The DBI-Callback thread (LWP 61736) crashes with SIGSEGV. After copying .dbg files from dotnet-symbol output and re-running GDB:

Abriged:

#0  MemoryRead64 (addr=0x0) at unwinder/amd64/unwinder.cpp:30
#1  OOPStackUnwinderAMD64::UnwindPrologue (... IntegerAddress = 0x0 ...) at unwinder/amd64/unwinder.cpp:754
#2  OOPStackUnwinderAMD64::VirtualUnwind at unwinder/amd64/unwinder.cpp:1617
#3  OOPStackUnwinderAMD64::Unwind (pContext=0x72c1f0b2f650) at unwinder/amd64/unwinder.cpp:255
#4  DacUnwindStackFrame at unwinder/amd64/unwinder.cpp:207
#5  Thread::VirtualUnwindCallFrame at stackwalk.cpp:637
#6  EECodeManager::EnsureCallerContextIsValid at eetwain.cpp:1033
#7  StackFrameIterator::ResetRegDisp at stackwalk.cpp:1301
#8  DacDbiInterfaceImpl::SetStackWalkCurrentContext at dacdbiimplstackwalk.cpp:193
#9  CordbStackWalk::SetContextWorker (tmpCtx.ContextFlags=1048587, tmpCtx.Rbp=0, all integer regs=0) at rsstackwalk.cpp:401
#10 CordbStackWalk::SetContext at rsstackwalk.cpp:355
#11 ShimStackWalk::CheckInternalFrame at shimstackwalk.cpp:1220
#12 ShimStackWalk::Populate at shimstackwalk.cpp:265
#13 ShimStackWalk::ShimStackWalk at shimstackwalk.cpp:33
#14 ShimProcess::LookupOrCreateShimStackWalk at shimprocess.cpp:1498
#15 CordbThread::FindFrame at rsthread.cpp:1402
#16 UpdateFrame at shimcallback.cpp:106
#17 ShimProxyCallback::Exception::ExceptionEvent::Dispatch at shimcallback.cpp:1184
#18 CordbProcess::DispatchRCEvent at process.cpp:4763
#19 CordbRCEventThread::FlushQueuedEvents at process.cpp:10349
#20-21 CordbRCEventThread::ThreadProc (the "DBI-Callback" thread) at process.cpp:10607
#22 CorUnix::CPalThread::ThreadEntry at thread.cpp:1744
#23 start_thread / #24 clone3

full

warning: Can't open file /memfd:doublemapper (deleted) during file-backed mapping note processing

warning: Can't open file /dev/shm/sem.qqSQFm (deleted) during file-backed mapping note processing

warning: Can't open file /dev/shm/sem.HtDEPL (deleted) during file-backed mapping note processing

warning: core file may not match specified executable file.
[New LWP 61736]
[New LWP 61703]
[New LWP 61705]
[New LWP 61704]
[New LWP 61713]
[New LWP 61714]
[New LWP 61726]
[New LWP 61738]
[New LWP 61728]
[New LWP 61707]
[New LWP 61744]
[New LWP 61710]
[New LWP 61719]
[New LWP 61720]
[New LWP 61721]
[New LWP 61737]
[New LWP 61715]
[New LWP 61701]
[New LWP 61706]
[New LWP 61697]
[New LWP 61742]
[New LWP 61729]
[New LWP 61780]
[New LWP 61717]
[New LWP 61699]
[New LWP 61711]
[New LWP 61718]
[New LWP 61702]
[New LWP 61723]
[New LWP 61724]

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.ubuntu.com>
Enable debuginfod for this session? (y or [n]) [answered N; input not from terminal]
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/home/fraguada/.vscode/extensions/ms-dotnettools.csharp-2.130.5-linux-x64/.debu'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  MemoryRead64 (addr=0x0) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:30

warning: 30     /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp: No such file or directory
[Current thread is 1 (Thread 0x72c2113ff6c0 (LWP 61736))]
[Switching to thread 1 (Thread 0x72c2113ff6c0 (LWP 61736))]
#0  MemoryRead64 (addr=0x0) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:30
30      in /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp
#0  MemoryRead64 (addr=0x0) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:30
No locals.
#1  OOPStackUnwinderAMD64::UnwindPrologue (ImageBase=ImageBase@entry=125532246966272, ControlPc=ControlPc@entry=125532247181952, FrameBase=18446744073709551360, FunctionEntry=FunctionEntry@entry=0x72c2113fcb0c, ContextRecord=ContextRecord@entry=0x72c1f0b2f650, ContextPointers=ContextPointers@entry=0x0, FinalFunctionEntry=0x72c2113fca20) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:754
        ChainCount = 0
        IntegerRegister = 0x72c1f0b2f6c8
        FloatingRegister = 0x72c1f0b2f7f0
        Index = 5
        MachineFrame = 0 '\000'
        PrologOffset = 336
        UnwindInfo = 0x72c22c0337f0
        UnwindOp = <optimized out>
        OpInfo = 5
        IntegerAddress = 0x0
        FrameOffset = <optimized out>
        ReturnAddress = <optimized out>
        StackAddress = <optimized out>
        FloatingAddress = <optimized out>
#2  0x000072c211605cda in OOPStackUnwinderAMD64::VirtualUnwind (HandlerType=HandlerType@entry=0, ImageBase=125532246966272, ControlPc=ControlPc@entry=125532247181952, FunctionEntry=FunctionEntry@entry=0x72c2113fcb0c, ContextRecord=ContextRecord@entry=0x72c1f0b2f650, HandlerData=HandlerData@entry=0x0, EstablisherFrame=0x72c2113fcb00, ContextPointers=0x0, HandlerRoutine=0x0) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:1617
        EpilogueOffset = <optimized out>
        FrameRegister = <optimized out>
        FoundHandler = 0x0
        UnwindInfo = 0x72c22c0337f0
        PrologOffset = <optimized out>
        FrameOffset = <optimized out>
        Index = <optimized out>
        UnwindOp = <optimized out>
        InEpilogue = <optimized out>
        EpilogueSize = <optimized out>
        Status = <optimized out>
        BranchTarget = <optimized out>
        PrimaryFunctionEntry = <optimized out>
        IntegerRegister = <optimized out>
        Displacement = <optimized out>
        IntegerAddress = <optimized out>
        RegisterNumber = <optimized out>
        RelativePc = <optimized out>
        UnwindVersion = <optimized out>
#3  0x000072c211604d9c in OOPStackUnwinderAMD64::Unwind (pContext=0x72c1f0b2f650) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:255
        functionEntry = {BeginAddress = 215344, EndAddress = 216378, UnwindInfoAddress = 216380}
        hr = <optimized out>
        uControlPC = 125532247181952
        uImageBase = 8
        EstablisherFrame = 18446744073709551360
#4  DacUnwindStackFrame (pContext=0x72c1f0b2f650, pContextPointers=0x72c1f0b30370) at /__w/1/s/src/coreclr/unwinder/amd64/unwinder.cpp:207
        res = <optimized out>
#5  0x000072c21150ef4e in Thread::VirtualUnwindCallFrame (pContext=0x72c1f400d260, pContextPointers=0x8, pCodeInfo=0x1) at /__w/1/s/src/coreclr/vm/stackwalk.cpp:637
        uControlPc = <optimized out>
#6  0x000072c211512e9f in EECodeManager::EnsureCallerContextIsValid (pRD=0x72c1f0b2ea00, pCodeInfo=0x0, flags=<optimized out>) at /__w/1/s/src/coreclr/vm/eetwain.cpp:1033
No locals.
#7  0x000072c211510bdf in StackFrameIterator::ResetRegDisp (this=0x72c1f0b2da90, pRegDisp=<optimized out>, fIsFirst=<optimized out>) at /__w/1/s/src/coreclr/vm/stackwalk.cpp:1301
        curSP = <optimized out>
        curPc = 125532247181952
        retVal = <optimized out>
#8  0x000072c211515754 in DacDbiInterfaceImpl::SetStackWalkCurrentContext (this=<optimized out>, vmThread=..., pSFIHandle=0x72c1f0b2da90, flag=SET_CONTEXT_FLAG_ACTIVE_FRAME, pContext=0x72c1f0afa610) at /__w/1/s/src/coreclr/debug/daccess/dacdbiimplstackwalk.cpp:193
        __dacHolder = {m_pOldContainer = 0x0, m_pOldAllocator = 0x0}
        pIter = 0x72c1f0b2da90
        pRD = 0x8
        pContext2 = 0x72c1f0b2dde0
        fSuccess = <optimized out>
#9  0x000072c22c16f952 in CordbStackWalk::SetContextWorker (this=this@entry=0x72c1f0afa5d0, flag=flag@entry=SET_CONTEXT_FLAG_ACTIVE_FRAME, contextSize=contextSize@entry=1232, context=context@entry=0x72c2113fd6e0 "") at /__w/1/s/src/coreclr/debug/di/rsstackwalk.cpp:401
        tmpCtx = {P1Home = 0, P2Home = 0, P3Home = 0, P4Home = 0, P5Home = 0, P6Home = 0, ContextFlags = 1048587, MxCsr = 0, SegCs = 0, SegDs = 0, SegEs = 0, SegFs = 0, SegGs = 0, SegSs = 0, EFlags = 0, Dr0 = 0, Dr1 = 0, Dr2 = 0, Dr3 = 0, Dr6 = 0, Dr7 = 0, Rax = 0, Rcx = 0, Rdx = 0, Rbx = 0, Rsp = 140735687540512, Rbp = 0, Rsi = 0, Rdi = 0, R8 = 0, R9 = 0, R10 = 0, R11 = 0, R12 = 0, R13 = 0, R14 = 0, R15 = 0, Rip = 125532247181952, {FltSave = {ControlWord = 0, StatusWord = 0, TagWord = 0 '\000', Reserved1 = 0 '\000', ErrorOpcode = 0, ErrorOffset = 0, ErrorSelector = 0, Reserved2 = 0, DataOffset = 0, DataSelector = 0, Reserved3 = 0, MxCsr = 0, MxCsr_Mask = 0, FloatRegisters = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, XmmRegisters = {{Low = 0, High = 0} <repeats 16 times>}, Reserved4 = '\000' <repeats 95 times>}, {Header = {{Low = 0, High = 0}, {Low = 0, High = 0}}, Legacy = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, Xmm0 = {Low = 0, High = 0}, Xmm1 = {Low = 0, High = 0}, Xmm2 = {Low = 0, High = 0}, Xmm3 = {Low = 0, High = 0}, Xmm4 = {Low = 0, High = 0}, Xmm5 = {Low = 0, High = 0}, Xmm6 = {Low = 0, High = 0}, Xmm7 = {Low = 0, High = 0}, Xmm8 = {Low = 0, High = 0}, Xmm9 = {Low = 0, High = 0}, Xmm10 = {Low = 0, High = 0}, Xmm11 = {Low = 0, High = 0}, Xmm12 = {Low = 0, High = 0}, Xmm13 = {Low = 0, High = 0}, Xmm14 = {Low = 0, High = 0}, Xmm15 = {Low = 0, High = 0}}}, VectorRegister = {{Low = 0, High = 0} <repeats 26 times>}, VectorControl = 0, DebugControl = 0, LastBranchToRip = 0, LastBranchFromRip = 0, LastExceptionToRip = 0, LastExceptionFromRip = 0}
        pSrcContext = <optimized out>
        pDAC = 0x72c1f400f940
#10 0x000072c22c170035 in CordbStackWalk::SetContext (this=0x72c1f0afa5d0, flag=SET_CONTEXT_FLAG_ACTIVE_FRAME, contextSize=1232, context=0x72c2113fd6e0 "") at /__w/1/s/src/coreclr/debug/di/rsstackwalk.cpp:355
        __lockHolder = {<BaseHolder<RSLock*, FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>, 0ul, &CompareDefault>> = {<FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>> = {<HolderBase<RSLock*>> = {m_value = 0x72c1f400c380}, <No data fields>}, m_acquired = 1}, <No data fields>}
        _____Neuter_Status_Already_Marked = 0
        __exceptionHolder = {<NativeExceptionHolderBase> = {_vptr$NativeExceptionHolderBase = 0x72c22c1f1460 <vtable for NativeExceptionHolderCatchAll+16>, m_head = 0x72c1f0000c20, m_next = 0x72c2113fe778}, <No data fields>}
        __autoCleanupTry = {m_refState = @0x72c2113fd190}
        __pExceptionRaw = <optimized out>
        __state = {m_dwFlags = 0, m_pExceptionPtr = 0x0}
        hr = 0
        __pThis = <optimized out>
#11 0x000072c22c147d74 in ShimStackWalk::CheckInternalFrame (this=<optimized out>, pNextStackFrame=<optimized out>, pStackWalkInfo=pStackWalkInfo@entry=0x72c2113fdc10, pThread3=<optimized out>, pSW=0x72c1f0b07538) at /__w/1/s/src/coreclr/debug/di/shimstackwalk.cpp:1220
        pTmpSW = {<BaseSmartPtr<ICorDebugStackWalk, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f0afa5f8}, <No data fields>}
        ctx = {P1Home = 0, P2Home = 0, P3Home = 0, P4Home = 0, P5Home = 0, P6Home = 0, ContextFlags = 1048587, MxCsr = 0, SegCs = 0, SegDs = 0, SegEs = 0, SegFs = 0, SegGs = 0, SegSs = 0, EFlags = 0, Dr0 = 0, Dr1 = 0, Dr2 = 0, Dr3 = 0, Dr6 = 0, Dr7 = 0, Rax = 0, Rcx = 0, Rdx = 0, Rbx = 0, Rsp = 140735687540512, Rbp = 0, Rsi = 0, Rdi = 0, R8 = 0, R9 = 0, R10 = 0, R11 = 0, R12 = 0, R13 = 0, R14 = 0, R15 = 0, Rip = 125532247181952, {FltSave = {ControlWord = 0, StatusWord = 0, TagWord = 0 '\000', Reserved1 = 0 '\000', ErrorOpcode = 0, ErrorOffset = 0, ErrorSelector = 0, Reserved2 = 0, DataOffset = 0, DataSelector = 0, Reserved3 = 0, MxCsr = 0, MxCsr_Mask = 0, FloatRegisters = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, XmmRegisters = {{Low = 0, High = 0} <repeats 16 times>}, Reserved4 = '\000' <repeats 95 times>}, {Header = {{Low = 0, High = 0}, {Low = 0, High = 0}}, Legacy = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, Xmm0 = {Low = 0, High = 0}, Xmm1 = {Low = 0, High = 0}, Xmm2 = {Low = 0, High = 0}, Xmm3 = {Low = 0, High = 0}, Xmm4 = {Low = 0, High = 0}, Xmm5 = {Low = 0, High = 0}, Xmm6 = {Low = 0, High = 0}, Xmm7 = {Low = 0, High = 0}, Xmm8 = {Low = 0, High = 0}, Xmm9 = {Low = 0, High = 0}, Xmm10 = {Low = 0, High = 0}, Xmm11 = {Low = 0, High = 0}, Xmm12 = {Low = 0, High = 0}, Xmm13 = {Low = 0, High = 0}, Xmm14 = {Low = 0, High = 0}, Xmm15 = {Low = 0, High = 0}}}, VectorRegister = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 126458882868302}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 7}, {Low = 4614118017888944128, High = 0}, {Low = 0, High = 4614118020909956096}, {Low = 0, High = 128}, {Low = 126177280786480, High = -136}, {Low = 16, High = 0}, {Low = 126177838619392, High = 126458882873108}, {Low = 126177347945568, High = 126177840955410}, {Low = 126177415061024, High = 128}, {Low = 0, High = 126177838619664}, {Low = 126177838619424, High = 12884901889}, {Low = 126177838619472, High = 126178288788793}, {Low = 126177838619504, High = 126177292385304}, {Low = 0, High = 0}, {Low = 4614118020909956096, High = 126177838619672}, {Low = 126177838619536, High = 126178288788499}, {Low = 126177292385216, High = 26061471864}, {Low = 4614118020909956096, High = 126177838619664}}, VectorControl = 126177838619672, DebugControl = 8589934593, LastBranchToRip = 126177838619600, LastBranchFromRip = 8589934593, LastExceptionToRip = 126177838619600, LastExceptionFromRip = 126178288761817}
        sp = <optimized out>
        frameAddr = <optimized out>
        hr = <optimized out>
        fIsInternalFrameFirst = 0
#12 0x000072c22c147118 in ShimStackWalk::Populate (this=this@entry=0x72c1f0af32b0) at /__w/1/s/src/coreclr/debug/di/shimstackwalk.cpp:265
        pFrame = {<BaseSmartPtr<ICorDebugFrame, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f0af9688}, <No data fields>}
        pThread3 = {<BaseSmartPtr<ICorDebugThread3, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f4013fc8}, <No data fields>}
        pSW = {<BaseSmartPtr<ICorDebugStackWalk, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f0b07538}, <No data fields>}
        chainInfo = {m_leafNativeContext = {P1Home = 0, P2Home = 0, P3Home = 0, P4Home = 0, P5Home = 0, P6Home = 0, ContextFlags = 1048587, MxCsr = 0, SegCs = 0, SegDs = 0, SegEs = 0, SegFs = 0, SegGs = 0, SegSs = 0, EFlags = 0, Dr0 = 0, Dr1 = 0, Dr2 = 0, Dr3 = 0, Dr6 = 0, Dr7 = 0, Rax = 0, Rcx = 0, Rdx = 0, Rbx = 0, Rsp = 140735687538336, Rbp = 0, Rsi = 0, Rdi = 0, R8 = 0, R9 = 0, R10 = 0, R11 = 0, R12 = 0, R13 = 0, R14 = 0, R15 = 0, Rip = 125534284295812, {FltSave = {ControlWord = 0, StatusWord = 0, TagWord = 0 '\000', Reserved1 = 0 '\000', ErrorOpcode = 0, ErrorOffset = 0, ErrorSelector = 0, Reserved2 = 0, DataOffset = 0, DataSelector = 0, Reserved3 = 0, MxCsr = 0, MxCsr_Mask = 0, FloatRegisters = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, XmmRegisters = {{Low = 0, High = 0} <repeats 16 times>}, Reserved4 = '\000' <repeats 95 times>}, {Header = {{Low = 0, High = 0}, {Low = 0, High = 0}}, Legacy = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, Xmm0 = {Low = 0, High = 0}, Xmm1 = {Low = 0, High = 0}, Xmm2 = {Low = 0, High = 0}, Xmm3 = {Low = 0, High = 0}, Xmm4 = {Low = 0, High = 0}, Xmm5 = {Low = 0, High = 0}, Xmm6 = {Low = 0, High = 0}, Xmm7 = {Low = 0, High = 0}, Xmm8 = {Low = 0, High = 0}, Xmm9 = {Low = 0, High = 0}, Xmm10 = {Low = 0, High = 0}, Xmm11 = {Low = 0, High = 0}, Xmm12 = {Low = 0, High = 0}, Xmm13 = {Low = 0, High = 0}, Xmm14 = {Low = 0, High = 0}, Xmm15 = {Low = 0, High = 0}}}, VectorRegister = {{Low = 0, High = 0} <repeats 11 times>, {Low = 0, High = 126458892282098}, {Low = 126177683442704, High = 126177838620824}, {Low = 126177838620816, High = 126177838620816}, {Low = 126178623150728, High = 126458892281474}, {Low = 0, High = 0}, {Low = 126177838620824, High = 126458892283516}, {Low = 151, High = 126177683442704}, {Low = 126177838620824, High = -192}, {Low = 0, High = 126177286624720}, {Low = 126177838620880, High = 126458882874830}, {Low = 184, High = 0}, {Low = 0, High = 0}, {Low = 61736, High = 0}, {Low = 126177683445712, High = 126458892236952}, {Low = 126177683445784, High = 126177683443728}}, VectorControl = 126177683444120, DebugControl = 126458892268115, LastBranchToRip = 126177683443728, LastBranchFromRip = 126458894954610, LastExceptionToRip = 126458892548864, LastExceptionFromRip = 126177683442760}, m_leafManagedContext = {P1Home = 126177838621096, P2Home = 126458894968010, P3Home = 126458892548864, P4Home = 126177683442704, P5Home = 126177838621096, P6Home = 126458892289359, ContextFlags = 1048587, MxCsr = 29377, SegCs = 0, SegDs = 4415, SegEs = 29378, SegFs = 0, SegGs = 15, SegSs = 0, EFlags = 0, Dr0 = 126177838621136, Dr1 = 126177292429424, Dr2 = 0, Dr3 = 126177292426832, Dr6 = 126177292435616, Dr7 = 0, Rax = 126458892259339, Rcx = 126177683443728, Rdx = 126178623122368, Rbx = 5273192104771712903, Rsp = 140735687535024, Rbp = 126177292435616, Rsi = 126458892324800, Rdi = 126177683443728, R8 = 126177292425792, R9 = 126177292435616, R10 = 126458890949543, R11 = 289399360, R12 = 126178623145456, R13 = 0, R14 = 126177838621544, R15 = 126177292431152, Rip = 125532189242310, {FltSave = {ControlWord = 0, StatusWord = 0, TagWord = 0 '\000', Reserved1 = 0 '\000', ErrorOpcode = 0, ErrorOffset = 0, ErrorSelector = 0, Reserved2 = 0, DataOffset = 0, DataSelector = 0, Reserved3 = 0, MxCsr = 0, MxCsr_Mask = 0, FloatRegisters = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, XmmRegisters = {{Low = 19, High = 126177292426832}, {Low = 126177292431152, High = 126458890951003}, {Low = 19, High = 2}, {Low = 125253479079936, High = 129}, {Low = 13312, High = 126177292433744}, {Low = 126177280792160, High = 126177838621904}, {Low = 4, High = 126177280796032}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 126177838621776, High = 126177838621856}, {Low = 126177841157488, High = 4879858519422410263}, {Low = 4001553479441880199, High = 4}, {Low = 126177280792160, High = 126177348071784}, {Low = 126177280796032, High = 1}, {Low = 0, High = 126178313177242}, {Low = 2, High = 125253479079936}}, Reserved4 = "\201\000\000\000\000\000\000\000\0004\000\000\000\000\000\000P\271\261\360\301r\000\000`\026\000\360\301r\000\000\320\344?\021\302r\000\000\004\000\000\000\000\000\000\000\200%\000\360\301r", '\000' <repeats 26 times>, "ȏ\037,\302r\000\000\001\000\000\000\n\000\000"}, {Header = {{Low = 0, High = 0}, {Low = 0, High = 0}}, Legacy = {{Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}, {Low = 0, High = 0}}, Xmm0 = {Low = 19, High = 126177292426832}, Xmm1 = {Low = 126177292431152, High = 126458890951003}, Xmm2 = {Low = 19, High = 2}, Xmm3 = {Low = 125253479079936, High = 129}, Xmm4 = {Low = 13312, High = 126177292433744}, Xmm5 = {Low = 126177280792160, High = 126177838621904}, Xmm6 = {Low = 4, High = 126177280796032}, Xmm7 = {Low = 0, High = 0}, Xmm8 = {Low = 0, High = 0}, Xmm9 = {Low = 126177838621776, High = 126177838621856}, Xmm10 = {Low = 126177841157488, High = 4879858519422410263}, Xmm11 = {Low = 4001553479441880199, High = 4}, Xmm12 = {Low = 126177280792160, High = 126177348071784}, Xmm13 = {Low = 126177280796032, High = 1}, Xmm14 = {Low = 0, High = 126178313177242}, Xmm15 = {Low = 2, High = 125253479079936}}}, VectorRegister = {{Low = 0, High = 126178313177756}, {Low = 0, High = 19}, {Low = 126177292430672, High = 126177415049104}, {Low = 126177415049144, High = 5643388865447173127}, {Low = 18446744072285311411, High = 126177415048992}, {Low = 126177415049056, High = 2}, {Low = 2, High = 126177838622032}, {Low = 126177838621920, High = 126177841378416}, {Low = 126177841378456, High = 126177415056976}, {Low = 18446744073575378792, High = 126177415048992}, {Low = 2, High = 2}, {Low = 0, High = 126177841377856}, {Low = 126177838622592, High = 126177840913973}, {Low = 57174604644352, High = 0}, {Low = 126177838622832, High = 126177838622704}, {Low = 2, High = 126177415048992}, {Low = 2, High = 126177415056976}, {Low = 0, High = 126177348071808}, {Low = 126177838621953, High = 126177347946352}, {Low = 126177280789600, High = 126177347972592}, {Low = 126177347977528, High = 126177415052976}, {Low = 0, High = 126177415052512}, {Low = 126177838622128, High = 126178313180682}, {Low = 126177838622144, High = -192}, {Low = 0, High = 126458882788732}, {Low = 126177838622192, High = 126177838622432}}, VectorControl = 126177415057472, DebugControl = 590571298254, LastBranchToRip = 18446744073452759312, LastBranchFromRip = 126177415057432, LastExceptionToRip = 126177415057468, LastExceptionFromRip = 126177415057468}, m_rootFP = {m_sp = 0x7fff94a9bdf8}, m_reason = CHAIN_ENTER_UNMANAGED, m_fNeedEnterManagedChain = true, m_fLeafNativeContextIsValid = true}
        swInfo = {m_pChildFrame = {<BaseSmartPtr<ICorDebugNativeFrame2, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x0}, <No data fields>}, m_pConvertedInternalFrame2 = {<BaseSmartPtr<ICorDebugInternalFrame2, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x0}, <No data fields>}, m_ppInternalFrame2 = {<BaseRSPtrArray<ICorDebugInternalFrame2, RSExtSmartPtr<ICorDebugInternalFrame2> >> = {m_pArray = 0x72c1f0af2fc8, m_cElements = 3}, <No data fields>}, m_cChain = 0, m_cFrame = 16, m_firstFrameInChain = 0, m_cInternalFrames = 3, m_curInternalFrame = 2, m_internalFrameType = STUBFRAME_M2U, m_fExhaustedAllStackFrames = false, m_fProcessingInternalFrame = false, m_fSkipChain = false, m_fLeafFrame = false, m_fHasConvertedFrame = false, m_fHasException = false}
        hr = <optimized out>
#13 0x000072c22c146d12 in ShimStackWalk::ShimStackWalk (this=0x72c1f0af32b0, pProcess=0x72c1f800d790, pThread=0x72c1f4013fb8) at /__w/1/s/src/coreclr/debug/di/shimstackwalk.cpp:33
No locals.
#14 0x000072c22c107df6 in ShimProcess::LookupOrCreateShimStackWalk (this=0x72c1f800d790, pThread=0x72c1f4013fb8) at /__w/1/s/src/coreclr/debug/di/shimprocess.cpp:1498
        pNewSW = {<Wrapper<ShimStackWalk*, &DoNothing, &Delete, 0ul, &CompareDefault, true>> = {<BaseWrapper<ShimStackWalk*, FunctionBase<ShimStackWalk*, &DoNothing, &Delete>, 0ul, &CompareDefault>> = {<BaseHolder<ShimStackWalk*, FunctionBase<ShimStackWalk*, &DoNothing, &Delete>, 0ul, &CompareDefault>> = {<FunctionBase<ShimStackWalk*, &DoNothing, &Delete>> = {<HolderBase<ShimStackWalk*>> = {m_value = 0x72c1f800d7c0}, <No data fields>}, m_acquired = 1}, <No data fields>}, <No data fields>}, <No data fields>}
        pSW = 0x0
#15 0x000072c22c151c8e in CordbThread::FindFrame (this=<optimized out>, ppFrame=0x72c2113fe7a0, fp=...) at /__w/1/s/src/coreclr/debug/di/rsthread.cpp:1402
        __ch = {<BaseHolder<RSLock*, FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>, 0ul, &CompareDefault>> = {<FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>> = {<HolderBase<RSLock*>> = {m_value = 0x72c1f400c460}, <No data fields>}, m_acquired = 1}, <No data fields>}
        _____Neuter_Status_Already_Marked = 0
        __proc_for_ATT = 0x72c1f400c0d0
        pSSW = <optimized out>
#16 0x000072c22c109054 in UpdateFrame (pThread=pThread@entry=0x72c1f4013fb8, pOldFrame=0x72c1f402b358) at /__w/1/s/src/coreclr/debug/di/shimcallback.cpp:106
        fp = {m_sp = 0x1}
        pThread2 = 0x72c1f400d260
        pFrame = 0x72c1f402b330
        __exceptionHolder = {<NativeExceptionHolderBase> = {_vptr$NativeExceptionHolderBase = 0x72c22c1f1460 <vtable for NativeExceptionHolderCatchAll+16>, m_head = 0x72c1f0000c20, m_next = 0x72c2113fe840}, <No data fields>}
        __autoCleanupTry = {m_refState = @0x72c2113fe790}
        __pExceptionRaw = <optimized out>
        __state = {m_dwFlags = 0, m_pExceptionPtr = 0x0}
        pNewFrame = {<BaseSmartPtr<ICorDebugFrame, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x0}, <No data fields>}
#17 0x000072c22c10e492 in ShimProxyCallback::Exception(ICorDebugAppDomain*, ICorDebugThread*, ICorDebugFrame*, unsigned int, CorDebugExceptionCallbackType, unsigned int)::ExceptionEvent::Dispatch(ManagedEvent::DispatchArgs) (this=0x72c1f402b390, args=...) at /__w/1/s/src/coreclr/debug/di/shimcallback.cpp:1184
No locals.
#18 0x000072c22c0f5e03 in CordbProcess::DispatchRCEvent (this=this@entry=0x72c1f400c0d0) at /__w/1/s/src/coreclr/debug/di/process.cpp:4763
        __exceptionHolder = {<NativeExceptionHolderBase> = {_vptr$NativeExceptionHolderBase = 0x72c22c1f1460 <vtable for NativeExceptionHolderCatchAll+16>, m_head = 0x72c1f0000c20, m_next = 0x0}, <No data fields>}
        __autoCleanupTry = {m_refState = @0x72c2113fe858}
        __pExceptionRaw = <optimized out>
        __state = {m_dwFlags = 0, m_pExceptionPtr = 0x0}
        inverseLockHolder = {<BaseHolder<RSLock*, FunctionBase<RSLock*, &RSLock::HolderLeave, &RSLock::HolderEnter>, 0ul, &CompareDefault>> = {<FunctionBase<RSLock*, &RSLock::HolderLeave, &RSLock::HolderEnter>> = {<HolderBase<RSLock*>> = {m_value = 0x72c1f400c380}, <No data fields>}, m_acquired = 1}, <No data fields>}
        args = {m_pCallback1 = 0x72c1f800be80, m_pCallback2 = 0x72c1f800be88, m_pCallback3 = 0x72c1f800be90, m_pCallback4 = 0x72c1f800be98}
        lockHolder = {<BaseHolder<RSLock*, FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>, 0ul, &CompareDefault>> = {<FunctionBase<RSLock*, &RSLock::HolderEnter, &RSLock::HolderLeave>> = {<HolderBase<RSLock*>> = {m_value = 0x72c1f400c380}, <No data fields>}, m_acquired = 1}, <No data fields>}
        __pahCallback = {m_oldCount = 0, m_type = DB_IPCE_INVALID_EVENT, m_pHolder = 0x0}
        pEvent = {<Wrapper<ManagedEvent*, &DoNothing, &Delete, 0ul, &CompareDefault, true>> = {<BaseWrapper<ManagedEvent*, FunctionBase<ManagedEvent*, &DoNothing, &Delete>, 0ul, &CompareDefault>> = {<BaseHolder<ManagedEvent*, FunctionBase<ManagedEvent*, &DoNothing, &Delete>, 0ul, &CompareDefault>> = {<FunctionBase<ManagedEvent*, &DoNothing, &Delete>> = {<HolderBase<ManagedEvent*>> = {m_value = 0x72c1f402b390}, <No data fields>}, m_acquired = <optimized out>}, <No data fields>}, <No data fields>}, <No data fields>}
        h = {m_p = 0x72c1f400c0d0}
        hr = <optimized out>
        hrCallback = 0
        pShim = {<BaseSmartPtr<ShimProcess, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f800d790}, <No data fields>}
#19 0x000072c22c0ff4b8 in CordbRCEventThread::FlushQueuedEvents (this=this@entry=0x72c1f800cbe0, process=process@entry=0x72c1f400c0d0) at /__w/1/s/src/coreclr/debug/di/process.cpp:10349
        pShim = {<BaseSmartPtr<ShimProcess, &HolderRSAddRefExternal, &HolderRSReleaseExternal>> = {m_ptr = 0x72c1f800d790}, <No data fields>}
#20 0x000072c22c0ffd62 in CordbRCEventThread::ThreadProc (this=0x72c1f800cbe0) at /__w/1/s/src/coreclr/debug/di/process.cpp:10607
        hashFind = {iBucket = 11, iNext = 4294967295}
        pHashTable = <optimized out>
        pProcess = 0x72c1f400c0d0
        i = 1
        dwStatus = <optimized out>
        waitSet = {0xc, 0x48, 0x0 <repeats 18 times>, 0x3633373136000000, 0x4008a3e4b410fc00, 0x0, 0x21000, 0x4000000, 0x72c1f4000000, 0x72c2113fecc0, 0x730380caa080 <alloc_new_heap+208>, 0x72c2113fed40, 0x730380cac4de <_int_malloc+3950>, 0x21000, 0x21000, 0x72c2113fee53, 0x0, 0x20000, 0x730380cac4de <_int_malloc+3950>, 0x1000, 0x0, 0x72c2113fed00, 0x4008a3e4b410fc00, 0x0, 0xd, 0xd, 0x0, 0x10, 0x4008a3e4b410fc00, 0x72c2113fed60, 0x2, 0x72c2113fed90, 0x72c211614fad <LOADCallDllMainSafe(_MODSTRUCT*, unsigned int, void*)+141>, 0x72c21165f5f8 <vtable for NativeExceptionHolder<LOADCallDllMainSafe(_MODSTRUCT*, unsigned int, void*)::$_0>+16>, 0x72c1f0000c20, 0x0, 0x72c2113fed40, 0x72c2113fed54, 0x72c2113fed58, 0xffffffff1169d3d0, 0x72c2113fed60, 0x72c1f800b8d0, 0x2, 0x0, 0xffffffff00000001, 0x4008a3e4b410fc00, 0x0}
        rgProcessSet = {0x0, 0x72c1f400c0d0, 0x0 <repeats 62 times>}
        waitCount = 2
#21 0x000072c22c0ffe09 in CordbRCEventThread::ThreadProc (parameter=0x72c1f400d260) at /__w/1/s/src/coreclr/debug/di/process.cpp:10673
        pThread = 0x72c1f400d260
#22 0x000072c21163896e in CorUnix::CPalThread::ThreadEntry (pvParam=0x72c1f800ce50) at /__w/1/s/src/coreclr/pal/src/thread/thread.cpp:1744
        cpuSet = {__bits = {16777215, 0 <repeats 15 times>}}
        pThread = 0x72c1f800ce50
        st = <optimized out>
        palError = <optimized out>
        pvPar = 0x72c1f400d260
        retValue = <optimized out>
        pfnStartRoutine = <optimized out>
        fail = <optimized out>
#23 0x0000730380c9caa4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447
        ret = <optimized out>
        pd = <optimized out>
        out = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {126177838626496, 6928631812084615268, 126177838626496, -192, 0, 126177859580560, 6928631812063643748, 7179953866482141284}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#24 0x0000730380d29c6c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
No locals.

ContextFlags = 0x10000B includes CONTEXT_INTEGER, but all integer registers (Rax, Rbx, Rbp, etc.) are zero — they were never actually copied. OOPStackUnwinderAMD64::UnwindPrologue then tries to read from IntegerAddress = 0x0, causing the null dereference.

This matches the root cause described in dotnet/runtime#115668, fixed by dotnet/runtime#116617 ("Copy integer registers on AMD64 architecture for debugger stackwalking"), merged to .NET 10 only. A backport to .NET 9 is tracked in dotnet/runtime#126083.

The crash is silent from the user's perspective — vsdbg's DBI-Callback thread crashes, the debugger disconnects (or never attaches), and VS Code shows no error. This is the UX issue: the user sees nothing useful.

Note, this is fixed in .net10. I have requested that it be backported to .net9. Installing .net10 sdk and runtime, and switching my app (temporarily) to use .net10 allows me to debug on vscode x64.

[gregg-miskelly]

Great! There is nothing that vsdbg can do about that crash, so I will resolve this as external.