feat: add zombie-reaper.py to handle zombie qemu left-overs

[okurz]

Related issue: https://progress.opensuse.org/issues/201144

[Martchus]

The script name should probably reflect that this is about s390x and qemu processes specifically.

I think it is part of the normal operation that qemu processes are in the zombie state for a very short time (until the parent process reads the exit status). It is probably unlikely that the script will take action in those cases but it isn't ideal.

[okurz]

The script name should probably reflect that this is about s390x and qemu processes specifically.

done

I think it is part of the normal operation that qemu processes are in the zombie state for a very short time (until the parent process reads the exit status). It is probably unlikely that the script will take action in those cases but it isn't ideal.

hm, not sure if that is realistic but ok :) Made the script reasonably more complicated by doing the following

• look for zombies
• if any found, sleep 10s
• look for same zombie PIDs again, if found, trigger reboot + job restart

[perlpunk]

• look for same zombie PIDs again, if found, trigger reboot + job restart

and then, to be safe, check if it's not a meanwhile newly started process with the same PID ;-)

[okurz]

• look for same zombie PIDs again, if found, trigger reboot + job restart

and then, to be safe, check if it's not a meanwhile newly started process with the same PID ;-)

done