[Pkg-zsh-devel] Bug#1105830: Bug#1105830: /bin/zsh: invalid memory access in wcs_nicechar_sel?

[Rob Leslie]

> On Jun 1, 2025, at 2:00 PM, Michael Prokop <mika at debian.org> wrote:
> 
>>> FTR, there's zsh 5.9-4+b6 with:
>>> 
>>> | * Binary-only non-maintainer upload for amd64; no source changes.
>>> | * Rebuild for outdated Built-Using (glibc/2.36-9+deb12u5)
>>> 
>>> And latest Debian point-release 12.11 provides libc6
>>> v2.36-9+deb12u10, wondering whether this would change anything,
>>> assuming that it's even reproducible in some way at all.
>> 
>> It looks like libc6 2.36-9+deb12u10 was installed on one machine on 2025-03-15 and a coredump followed on 2025-05-17, so that didn’t seem to change anything.
> 
> Was the system rebooted in between?
> Was the system fully upgraded to what Debian v12 provides?

Yes, the system was fully upgraded and rebooted after each upgrade.

> Do the ~13 occurences you observed so far have anything in common?

The only thing I can think is that they were all most likely running a tmux client process (i.e. tmux -u attach -t 1) when they were terminated. All the machines have the byobu package installed and run tmux at login.

If you were to try to reproduce, you could install the byobu package and start it from ~/.zprofile like this:

_byobu_sourced=1 . /usr/bin/byobu-launch 2>/dev/null || true

Then connect to the machine remotely via ssh in a local window and perhaps simulate dropping the connection by closing the window?

Thanks,
  -rob