Hi Bastian, I found the fix for the stack smash. I sent to denemo's official maintainer and that patch is also merged with upstream repository. I will link the commit and bug report.
https://savannah.gnu.org/bugs/?func=detailitem&item_id=67002#options https://git.savannah.gnu.org/cgit/denemo.git/commit/?id=c111f4339a9f4f3238676cc1391fe9ef194a1679 With these changes when tried on my s390x machine, autopkgtest is passing. Thanks, Pranav