[sr-dev] [kamailio/kamailio] Deadlocks after ungracefully terminated TLS connections (#2395)

[Daniel-Constantin Mierla]

I see that libmysqlclient is linked against libssl 1.0, so doesn't seem to be mixed libs.

A blocked process can block the instance, if they acquired other mutexes (e.g., a mutex used to protect other tcp/tls connections). In the traces, only one process seems to be blocked, so for some cases it should still work, but not easy to say which should work and what is locked.

Probably the db_mysql commits will be backported before the next 5.2.x release.

In master branch I also aded `kamctl pstrap` command to use ps for getting the list of pids for kamailio and write the gdb backtrace file.

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