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Message-ID: <fc1bdd5b-7732-4430-a130-70ef662acd36@dronecode.org.uk>
Date: Sun, 1 Feb 2026 17:08:11 +0000
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Subject: Re: git fsck complains about error:
 refs/tags/.cyg000000000559e25517156b51cf219f51/libgcj-2.95.0: badRefName:
 invalid refname format?!
To: Dan Shelton <dan DOT f DOT shelton AT gmail DOT com>, cygwin AT cygwin DOT com
References: <CAAvCNcDzoq3skCwRuYa2LLTTA3xsnK+eDLB8_SegJZinatMUSg AT mail DOT gmail DOT com>
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From: Jon Turney via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
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On 31/01/2026 18:42, Dan Shelton via Cygwin wrote:
> Hello, on Cygwin 3.6.6-1.x86_64 on CYGWIN_NT-10.0-19045/Win10 I get
> these errors from git fsck when working on a clean clone of the
> gcc.git repro:
> 
> git fsck
> error: refs/tags/.cyg000000000559e25517156b51cf219f51/libgcj-2.95.1:
> badRefName: invalid refname format
> error: refs/tags/.cyg000000000559e25517156b51cf219f51/libgcj-2.95.0:
> badRefName: invalid refname format
> error: refs/tags/.cyg000000000559e25817156b51cf219f51/libf2c-0.5.22:
> badRefName: invalid refname format
> error: refs/tags/.cyg000000000559e25817156b51cf219f51/libf2c-0.5.21:
> badRefName: invalid refname format
> 
> git fsck then exits with error code 8, breaking our scripts.
> 
> Is this a Cygwin bug or feature running wild?
Yes.

These .cygXXX files are made by the cygwin DLL (I think it's something 
like a hardlink to the running executable so we can fork even if it's 
deleted, but I might well be misremembering the details) and are 
supposed to get automatically removed.

Obviously, 'git fsck' objects to their presence, but it is safe to 
remove them.


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