git fsck complains about error: refs/tags/.cyg000000000559e25517156b51cf219f51/libgcj-2.95.0: badRefName: invalid refname format?!

Corinna Vinschen corinna-cygwin@cygwin.com
Mon Feb 2 13:40:49 GMT 2026


On Feb  2 13:24, Dan Shelton via Cygwin wrote:
> I'm not sure whether the Cygwin code is correct. I did a peek with a
> kernel debugger, and I see that FILE_RENAME_INFORMATION.RootDirectory
> is always NULL if a file gets renamed to .cyg000000000xxxx. But if I
> try that with NTFS or SMB, the NtSetInformationFile() to set
> FileRenameInformation always fails.

Your testcase is incorrect, unfortunately. 

>     fri->FileNameLength = (wcslen(dstfile)+1)*sizeof(wchar_t);

For NT file paths, never count the trailing \0 to the length:

      fri->FileNameLength = wcslen(dstfile) * sizeof (WCHAR);

With that, your testcase works fine for me.

On which filesystem did you see the problem?


Corinna


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