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microsoft / clrmd

Microsoft.Diagnostics.Runtime is a set of APIs for introspecting processes and dumps.
MIT License
1.05k stars 256 forks source link

Implement /proc/pid fallback on Linux #1253

Closed kevingosse closed 5 months ago

kevingosse commented 5 months ago

I ran into a situation where createdump was able to read the memory of the crashing process but ClrMD failed with an UnauthorizedAccessException. After digging deeper, it looks like createdump fallbacks to reading /proc/<pid>/mem when process_vm_readv returns EPERM:

https://github.com/dotnet/runtime/blob/15e98e58e6023be3121dcb0ed2e701d1d5cd098e/src/coreclr/debug/createdump/crashinfounix.cpp#L514-L531

I don't actually know why process_vm_readv fails (it's in an ARM64 CI agent running docker), but the fallback fixes it.

leculver commented 5 months ago

Apologies for the delay here. I have been focused on other work, then was on vacation.