Bug#1020559: libc6: After upgrading libc6 expr is crashing with "stack smashing detected"

[Vasudev Kamath <vasudev-debian@copyninja.info>]

Aurelien Jarno <aurelien@aurel32.net> writes:

> Hi,
>
> On 2022-09-26 09:45, Vasudev Kamath wrote:
>> And post removing /usr/lib version of libc it seems to work fine and no
>> crash is happening.
>> 
>> └─(09:44:30 on master)──> expr                                                                                                                                              1 ↵ ──(Mon,Sep26)─┘
>> expr: missing operand
>> Try 'expr --help' for more information.
>> ┌─(~/.emacs.d)─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(vasudeva.sk@bhrigu:pts/8)─┐
>> └─(09:44:39 on master)──>
>
> Thanks for all the details. It's great that your system is now fixed. Do
> you have an idea why libc6 2.34 ended up in /usr/lib/x86_64-linux-gnu?
> I do not see any explanation from the glibc side. Did you attempt a
> usrmerge migration that failed after moving some files, or do you think
> it's unrelated? 
>

I seriously did not have a clue why system was in this state. I had
installed system back in 2019 and just keep updating. Also it was not
just glibc, a whole bunch of packages were in this state and it took me a
while to fix the entire system. (Had to write script to automate entire
process).

I don't remember me attempting to install usrmerge but not sure if it
came via some dependency and failed to install. Feels weird why system
was in such a state.

Cheers,
Vasudev