"Read out of buffer" in DecodeForwardIteratorRecord

[jnm2]

One of the PDB's I'm processing throws this InvalidOperationException.

Microsoft.DiaSymReader.Converter.dll!Microsoft.CodeAnalysis.Debugging.CustomDebugInfoReader.ReadInt16(System.Collections.Immutable.ImmutableArray<byte> bytes, ref int offset) Line 551	C#
Microsoft.DiaSymReader.Converter.dll!Microsoft.CodeAnalysis.Debugging.CustomDebugInfoReader.DecodeForwardIteratorRecord(System.Collections.Immutable.ImmutableArray<byte> bytes) Line 209	C#
Microsoft.DiaSymReader.Converter.dll!Microsoft.DiaSymReader.Tools.PdbConverterWindowsToPortable.Convert(Microsoft.DiaSymReader.ISymUnmanagedReader5 symReader, System.Reflection.PortableExecutable.PEReader peReader, System.IO.Stream targetPdbStream, System.Reflection.Metadata.BlobContentId pdbId) Line 311	C#
Microsoft.DiaSymReader.Converter.dll!Microsoft.DiaSymReader.Tools.PdbConverterWindowsToPortable.Convert(System.Reflection.PortableExecutable.PEReader peReader, System.IO.Stream sourcePdbStream, System.IO.Stream targetPdbStream) Line 55	C#
Microsoft.DiaSymReader.Converter.dll!Microsoft.DiaSymReader.Tools.PdbConverter.ConvertWindowsToPortable(System.Reflection.PortableExecutable.PEReader peReader, System.IO.Stream sourcePdbStream, System.IO.Stream targetPdbStream) Line 91	C#

This is the line:

symreader-converter/src/Microsoft.DiaSymReader.Converter/PdbConverterWindowsToPortable.cs

Line 311 in 106d955

dynamicLocals = CustomDebugInfoReader.DecodeDynamicLocalsRecord(record.Data);

I'm not seeing a file for Microsoft.CodeAnalysis.Debugging.CustomDebugInfoReader in this repo somehow even though it's in Microsoft.DiaSymReader.Converter.dll.

It's a Windows PDB. I can share it privately. I wouldn't expect it to be invalid because was compiled recently by a major software tools vendor.

[tmat]

It's linked in from a source package published from Roslyn repo. You should be able to step thru and let Source Link fetch the source :)

It is possible that older Windows PDBs might have bad debug info. We have had bugs in the compiler/pdb writer. If you can share the PDB, please send me a link to tomat microsoft com

[jnm2]

I had stepped through but I wasn't sure which repo to look in. That makes sense.

Emailed, thank you!

[tmat]

Got it