I had sent you the strace output in private mail. Since this morning I got the SIGSEGV also with my own repository, but only for 3 hosts of about 400. No other repos except for
deb http://deb.debian.org/debian/ buster main contrib non-free deb-src http://deb.debian.org/debian/ buster main contrib non-free deb http://security.debian.org/ buster/updates main contrib non-free deb-src http://security.debian.org/ buster/updates main contrib non-free are in sources.list of these 3 hosts. This started pretty weird: Using clusterssh I had upgraded about 30 Debian hosts (Buster and Bullseye, real hardware and LXC containers) in parallel, including these 3 containers. All succeeded. When I pressed 'f' and entered no pattern these 3 hosts died with a SIGSEGV for the first time. Reproducible. Restarting aptitude did not help, they died on 'f' again. I ran aptitude forget-new on the command line. This succeeded. Since then these 3 hosts die immediately on running aptitude, not waiting for 'f' or any other input. Hope this helps Regards Harri