Bug#1108192: dpkg: segfault in dpkg-trigger

Control: tag -1 unreproducible moreinfo

Hi!

On Sun, 2025-06-22 at 14:38:40 -0400, Noah Meyerhans wrote:
> Package: dpkg
> Version: 1.22.20
> Severity: normal

> This may be a usage error on my part, but it should probably not be
> segfaulting either way.  While investigating a possible solution to
> #1108166, I encountered the following segfault in dpkg-trigger:
> 
> root@satest-trixie:~# dpkg-trigger --by-package=sa-compile --no-await --no-act sa-compile-upgrade
> [  721.686463] dpkg-trigger[5137]: segfault at c0 ip 00007f8b7d127d8a sp 00007fffe1a0dc90 error 4 in libc.so.6[64d8a,7f8b7d0e
> b000+165000] likely on CPU 0 (core 0, socket 0)
> [  721.688762] Code: 00 e8 ea 3d 02 00 48 89 f9 e9 a5 fa ff ff 66 90 41 57 41 56 41 55 41 54 49 89 d4 55 48 89 f5 53 48 89 fb
>  48 81 ec f8 00 00 00 <8b> 87 c0 00 00 00 64 4c 8b 2c 25 28 00 00 00 4c 89 ac 24 e8 00 00
> Segmentation fault

I tried that invocation on a minimal sid chroot, with the sa-compile
package installed, and I could not reproduce the segfault. If you can
still reproduce that, could you send at least the dpkg status file and
the /var/lib/dpkg/triggers/ directory? If that contains sensitive data,
feel free to send it privately to me.

Also if you could also send a backtrace that would be great.

Thanks,
Guillem