file-5.46 segfault on Cygwin (only)

[Andrey Repin]

Greetings, raf!

> The current version of file/libmagic on Cygwin is 5.46.

> It crashes when trying to analyse the zipfile
> CookieAutoDelete@kennydo.com.xpi (a Firefox addon).
> This is without decompressing the zipfile to allow
> further analsis.

$ file --version; file CookieAutoDelete@kennydo.com.xpi
file-5.46
magic file from /usr/share/misc/magic
CookieAutoDelete@kennydo.com.xpi: Zip archive data, at least v2.0 to extract, compression method=deflate


> It's here for reference (raf.org/tmp/CookieAutoDelete@kennydo.com.xpi).

> Strangely, 5.46 on macOS and Debian don't crash with this file.
> It's just the 5.46 on Cygwin.

Try the usual:

1. Shut down every cygwin process.
2. ps ax to verify.
3. Re-run cygwin setup.
4. Try rebase-trigger full if that didn't help.

> I compiled 5.46 on Cygwin myself to see if it's something
> wrong just with the Cygwin package of file-devel but that
> crashed too.

> 5.47 on all three systems doesn't crash, so that's good.

> So, if anyone here has anything to do with packaging file-devel
> for Cygwin, please update the package to 5.47. Thanks.


-- 
With best regards,
Andrey Repin
Sunday, May 24, 2026 11:45:06

Sorry for my terrible english...