Fix truncated exe file name in .NET core mini dump file name#123192
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barosiak merged 6 commits intodotnet:mainfrom Jan 21, 2026
Merged
Fix truncated exe file name in .NET core mini dump file name#123192barosiak merged 6 commits intodotnet:mainfrom
barosiak merged 6 commits intodotnet:mainfrom
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Pull request overview
This PR fixes the truncated executable file name issue in mini dump file names on Linux. When DOTNET_DbgMiniDumpName is set to %e.dmp, the executable name was being truncated to 15 characters because it was read from /proc/<pid>/status which uses a 16-byte buffer. The fix changes the code to first attempt reading the full executable path from /proc/<pid>/exe symlink (which has no length limit), falling back to the original /proc/<pid>/status method if that fails.
Changes:
- Add logic to read executable name from
/proc/<pid>/exesymlink before falling back to/proc/<pid>/status - Extract basename from the full path obtained via
readlink - Maintain backward compatibility by keeping the original status-based method as fallback
noahfalk
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Jan 16, 2026
Co-authored-by: Noah Falk <[email protected]>
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/ba-g Known issue #123260 closed. No need to run another round of CI |
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When creating mini dumps on Linux with the DOTNET_DbgMiniDumpName set to %e.dmp, the exe file name (%e) gets truncated to 15 characters as it's read from /proc/<pid>/status, which stores it in a 16-byte buffer.
This PR changes it, so that the executable name is read from /proc/<pid>/exe, with no length limit, and if that fails, then it fallbacks to reading from /proc/<pid>/status.
Tested locally by a local single-file test in the diagnostics repo, which will be added after these changes flow into the diagnostics repo.
Fix #83419