Sometimes after pressing exit button in Steam or shutting down PC while Steam is running, system hangs.
Journalctl shows kernel panic.
SIGKILL on Steam process also can trigger it. PC specs Kernel panic trace
Sounds like the xpad driver in your kernel is faulty and can crash on closing the device; you should report a bug on the linux-input mailing list instead.
Sometimes after pressing exit button in Steam or shutting down PC while Steam is running, system hangs.
Journalctl shows kernel panic.
SIGKILL on Steam process also can trigger it.
PC specs
Kernel panic trace