[sr-dev] [kamailio/kamailio] dead lock and 100% CPU ussage on shutdown (#2795)

[Daniel-Constantin Mierla]

If it happens that the process setting the alarm for `exit_timeout` crashes and another one is in lock/busy loop, then it is somehow really bad luck. Not sure what would be an easy solution, maybe having a watcher process not doing anything, not even at startup/shutdown (PRs are welcome). If it is something that happens always, then there is another crash causing this behaviour.

Maybe systemd has some option for `stop` to `kill` it after a while if the process refuses to stop.

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