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AccessViolationException in ArrayDictionary #858
Description
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Microsoft.Build.Collections.ArrayDictionary`2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Add(System.__Canon, System.__Canon)
at Microsoft.Build.Logging.StructuredLogger.BuildEventArgsReader.CreateDictionary(System.Collections.Generic.List`1<System.ValueTuple`2<Int32,Int32>>)
at Microsoft.Build.Logging.StructuredLogger.BuildEventArgsReader.ReadNameValueList()
at Microsoft.Build.Logging.StructuredLogger.BuildEventArgsReader.PreprocessRecordsTillNextEvent(System.Func`2<Microsoft.Build.Logging.StructuredLogger.BinaryLogRecordKind,Boolean>)
at Microsoft.Build.Logging.StructuredLogger.BuildEventArgsReader.Read()
at Microsoft.Build.Logging.StructuredLogger.BinLogReader.Replay(System.IO.Stream, Microsoft.Build.Logging.StructuredLogger.Progress)
at Microsoft.Build.Logging.StructuredLogger.BinaryLog.ReadBuild(System.IO.Stream, Microsoft.Build.Logging.StructuredLogger.Progress, Byte[], Microsoft.Build.Logging.StructuredLogger.ReaderSettings)
at Microsoft.Build.Logging.StructuredLogger.BinaryLog.ReadBuild(System.String, Microsoft.Build.Logging.StructuredLogger.Progress, Microsoft.Build.Logging.StructuredLogger.ReaderSettings)
at Microsoft.Build.Logging.StructuredLogger.BinaryLog.ReadBuild(System.String, Microsoft.Build.Logging.StructuredLogger.Progress)
at Microsoft.Build.Logging.StructuredLogger.BinaryLog.ReadBuild(System.String)
at BinlogTool.BinlogToolCommandBase.ReadBuild(System.String, Boolean)
at BinlogTool.ListNuget.Run(System.String, System.String)
at BinlogTool.Program.Main(System.String[])
Activity
BenjaminBrienen commentedon Apr 15, 2025
We also encountered this
KirillOsenkov commentedon Apr 15, 2025
I don't have the foggiest idea what could be causing an AV here:
MSBuildStructuredLog/src/StructuredLogger/BinaryLogger/BuildEventArgsReader.Viewer.cs
Line 28 in ba0729b
Looks like a .NET runtime bug honestly, since it's very rare and intermittent.
Reading a binlog is an incredibly CPU intensive operation with a ton of parallelism that is saturating your CPUs. I can imagine this bug only surfacing under extreme load.
Or am doing something stupid somewhere, but I just can't see what it could be.
KirillOsenkov commentedon Apr 15, 2025
If possible, try to capture a dump of the process state when this happens.
You can use this registry setting and for every crashed process a dump will appear in C:\CrashDumps:
https://github.com/KirillOsenkov/dotfiles/blob/main/LocalDumps.reg
Don't forget to create the C:\CrashDumps directory first, of course.
Once we have a dump, we can look at what's going on using a native debugger. A managed debugger alone won't show what's going on here.
KirillOsenkov commentedon Apr 15, 2025
I forgot that I opened the bug initially. Well, I suppose I'll remember to grab a dump next time I see this.
KirillOsenkov commentedon Oct 9, 2025
The exact crash is in the Add method:
MSBuildStructuredLog/src/StructuredLogger/BinaryLogger/BuildEventArgsReader.Viewer.cs
Line 35 in ba0729b