SIGKILL is almost always sent by systemd-oomd (or the kernel OOM killer). That's the most likely explanation. Theoretically it could also be sent by systemd if a service didn't quit quickly enough following a SIGTERM. Maybe it could also be sent by mutter if a program is unresponsive?

WebKitGTK doesn't use SIGKILL to clean up after itself. The parent process just closes its IPC socket to the child process, then the child should either (a) exit normally, or (b) crash itself, if its watchdog thread detects the main thread has hung.

On Wed, Jan 31 2024 at 11:08:16 AM +01:00:00, Milan Crha <mc...@redhat.com> wrote:
Jan 31 10:49:23 localhost.localdomain xdg-desktop-por[2697]: Realtime
error: Could not map pid: Could not determine pid namespace: Could not
find instance-id in process's /.flatpak-info

This one is https://bugs.webkit.org/show_bug.cgi?id=238403 (fixed recently)

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