Seeing this on multiple PRs:
2026-06-09T19:58:42.0544708Z Compiling generated managed-to-native sources with emcc -O2 ...
2026-06-09T19:58:42.5837769Z [1/3] callhelpers-pinvoke.cpp -> callhelpers-pinvoke.o [took 0.52s]
2026-06-09T19:58:42.6555515Z [2/3] callhelpers-interp-to-managed.cpp -> callhelpers-interp-to-managed.o [took 0.60s]
2026-06-09T19:58:42.7308959Z [3/3] callhelpers-reverse.cpp -> callhelpers-reverse.o [took 0.67s]
2026-06-09T19:58:42.7432963Z Linking CoreCLR WASM with initial memory 33554432 bytes.
2026-06-09T19:58:42.7435788Z Linking with emcc -O2. This may take a while ...
2026-06-09T19:58:44.1657941Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_GetManagedStackTrace. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.1659111Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_CallDelegate. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.1660028Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_CompleteTask. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.1660942Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_ReleaseJSOwnedObjectByGCHandle. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.1661809Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_BindAssemblyExports. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.1662677Z wasm-ld : error : C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so: undefined symbol: SystemInteropJS_CallJSExport. Required by BrowserHost_ExternalAssemblyProbe [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.2031904Z emcc : error : 'D:/a/_work/1/s/src/mono/browser/emsdk/bin\wasm-ld.exe -o D:\a\_work\1\s\artifacts\obj\mono\Wasm.Console.Node.Sample\browser.wasm.Release\wasm\for-publish\dotnet.native.wasm D:\a\_work\1\s\artifacts\obj\mono\Wasm.Console.Node.Sample\browser.wasm.Release\wasm\for-publish\callhelpers-pinvoke.o D:\a\_work\1\s\artifacts\obj\mono\Wasm.Console.Node.Sample\browser.wasm.Release\wasm\for-publish\callhelpers-reverse.o D:\a\_work\1\s\artifacts\obj\mono\Wasm.Console.Node.Sample\browser.wasm.Release\wasm\for-publish\callhelpers-interp-to-managed.o D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libBrowserHost.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libcoreclr_static.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libnativeresourcestring.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libgcinfo_unix_wasm.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libcoreclrminipal.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libcoreclrpal.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libminipal.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.Native.Browser.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.Runtime.InteropServices.JavaScript.Native.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.Native.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.Globalization.Native.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libicuuc.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libicui18n.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libicudata.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.IO.Compression.Native.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libz.a D:\a\_work\1\s\artifacts\bin\microsoft.netcore.app.runtime.browser-wasm\Release\runtimes\browser-wasm\native\libSystem.Native.TimeZoneData.a --export=__stack_pointer --error-limit=0 -LD:\a\_work\1\s\src\mono\browser\emsdk\emscripten\cache\sysroot\lib\wasm32-emscripten -lGL-getprocaddr -lal -lhtml5 -lbulkmemory -lstubs -lc -ldlmalloc -lcompiler_rt-wasm-sjlj -lc++-except -lc++abi-except -lunwind-except -lsockets -mllvm -combiner-global-alias-analysis=false -mllvm -wasm-enable-sjlj -mllvm -disable-lsr -mllvm -wasm-enable-eh -mllvm -exception-model=wasm C:\Users\CLOUDT~1\AppData\Local\Temp\tmpqm0a9ffblibemscripten_js_symbols.so --export=free --export=htons --export=malloc --export=sbrk --export=memalign --export=posix_memalign --export=memset --export=ntohs --export=stackAlloc --export=stackRestore --export=stackSave --export=__stack_pointer --export=stackAlloc --export=__funcs_on_exit --export=__trap --export=__wasm_call_ctors --export=BrowserHost_CreateHostContract --export=BrowserHost_InitializeDotnet --export=BrowserHost_ExecuteAssembly --export=BrowserHost_ShutdownDotnet --export=SystemInteropJS_GetManagedStackTrace --export=SystemInteropJS_CallDelegate --export=SystemInteropJS_CompleteTask --export=SystemInteropJS_ReleaseJSOwnedObjectByGCHandle --export=SystemInteropJS_BindAssemblyExports --export=SystemInteropJS_CallJSExport --export=SystemJS_ExecuteTimerCallback --export=SystemJS_ExecuteBackgroundJobCallback --export=SystemJS_ExecuteFinalizationCallback --export=SystemJS_ExecuteDiagnosticServerCallback --export=GetDotNetRuntimeContractDescriptor --export=_exit --export=stackSave --export=stackRestore --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=fflush --export-table --growable-table -z stack-size=2097152 --max-memory=2147483648 --initial-memory=33554432 --no-entry --table-base=1 --global-base=1024' failed (returned 1) [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.2280521Z D:\a\_work\1\s\src\mono\browser\build\BrowserWasmApp.CoreCLR.targets(643,5): error MSB3073: The command ""D:\a\_work\1\s\src\mono\browser\emsdk\emscripten\emcc" -fwasm-exceptions -msimd128 "@D:\a\_work\1\s\artifacts\obj\mono\Wasm.Console.Node.Sample\browser.wasm.Release\wasm\for-publish\emcc-link.rsp"" exited with code 1. [D:\a\_work\1\s\src\mono\sample\wasm\console-node\Wasm.Console.Node.Sample.csproj]
2026-06-09T19:58:44.3561395Z
2026-06-09T19:58:44.3629303Z Build FAILED.
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1456473&view=results
Build error leg or test failing: browser-wasm windows checked CoreCLR_ReleaseLibraries
Error Message
Fill the error message using step by step known issues guidance.
{
"ErrorMessage": "undefined symbol: SystemInteropJS_GetManagedStackTrace",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1456473
Error message validated: [undefined symbol: SystemInteropJS_GetManagedStackTrace]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/10/2026 11:30:22 AM UTC
Report
Summary
| 24-Hour Hit Count |
7-Day Hit Count |
1-Month Count |
| 54 |
108 |
108 |
Seeing this on multiple PRs:
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1456473&view=results
Build error leg or test failing: browser-wasm windows checked CoreCLR_ReleaseLibraries
Error Message
Fill the error message using step by step known issues guidance.
{ "ErrorMessage": "undefined symbol: SystemInteropJS_GetManagedStackTrace", "BuildRetry": false, "ExcludeConsoleLog": false }Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1456473
Error message validated:
[undefined symbol: SystemInteropJS_GetManagedStackTrace]Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/10/2026 11:30:22 AM UTC
Report
Summary