Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?

assuming a new user identity via  su, thereby starting a new
interactive bash session, and entering the first command

   * What was the outcome of this action?

bash bails with

malloc: unknown:0: assertion botched
malloc: block on free list clobbered
last command: exit
Aborting...

leaving the terminal misconfigured in the process as well; note
that there was no exit command given at all - bash made that up

   * What outcome did you expect instead?

an interactive bash session that lives beyond the first command (line)

*** End of the template - remove these template lines ***

Control: tags -1 moreinfo

This does not seem to happen in Debian 12 with bash version 5.2.15-2.

Can you still reproduce this issue?