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

[Dan Shelton]

On Mon, 2 Feb 2026 at 14:40, Corinna Vinschen via Cygwin
<cygwin@cygwin.com> wrote:
>
> 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?

Windows NFSv3 client (the builtin one, not the newer NFSv4.1 one).

Dan
-- 
Dan Shelton - Cluster Specialist Win/Lin/Bsd