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wasm lanes fail with log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018) #126714
{
"ErrorMessage": "log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018)",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
ChromeDriver was started successfully on port 46709.
[04:23:22] info: Running in: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/146.0.0.0 Safari/537.36
[04:23:22] info: Running at: http://127.0.0.1:40169/index.html?arg=--run&arg=WasmTestRunner.dll&arg=Common.Tests.dll&arg=-notrait&arg=category%3dIgnoreForCI&arg=-notrait&arg=category%3dOuterLoop&arg=-notrait&arg=category%3dfailing&arg=-verbosity&arg=Info
[04:23:22] info: could not load /runArgs.json: 404. Ignoring
[04:23:22] info: Incoming arguments: --run WasmTestRunner.dll Common.Tests.dll -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing -verbosity Info
[04:23:22] info: Application arguments: --run WasmTestRunner.dll Common.Tests.dll -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing -verbosity Info
[04:23:23] info: log error: Failed to load System.Private.CoreLib.dll (error code 0x80131018)
[04:23:23] info: log error: Path: /System.Private.CoreLib.dll
[04:23:23] info: log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018)
[04:23:23] info: coreclr_initialize failed - Error: 0x80131018
[04:23:23] info: WASM EXIT -1
[04:23:23] info: Waiting to flush log messages with a timeout of 120 secs ..
[04:23:23] info: DOTNET: Aborting startup, reason: Error: Failed to initialize CoreCLR
[04:23:23] fail: Application has finished with exit code -1 but 0 was expected
[04:23:23] info: Closing 1 browser tabs before setting the main tab to config page and quitting.
Known issue validation
Build: 🔎https://dev.azure.com/dnceng-public/public/_build/results?buildId=1371487 Error message validated:[log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018)] Result validation: ✅ Known issue matched with the provided build. Validation performed at: 4/9/2026 3:36:07 PM UTC
Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1371487
Build error leg or test failing: WasmTestOnChrome-CLR-ST-Invariant.Tests.WorkItemExecution
Pull request: #126657
Error Message
Fill the error message using step by step known issues guidance.
{ "ErrorMessage": "log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018)", "ErrorPattern": "", "BuildRetry": false, "ExcludeConsoleLog": false }Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1371487
Error message validated:
[log error: Error message: Could not load file or assembly '/System.Private.CoreLib.dll'. The module was expected to contain an assembly manifest. (0x80131018)]Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/9/2026 3:36:07 PM UTC
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Summary