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

[Laszlo]

Thanks so far!

```
$ ldd /usr/lib/x86_64-linux-gnu/libmysqlclient.so.20
	linux-vdso.so.1 =>  (0x00007ffdb0fc4000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff76e52c000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff76e312000)
	libssl.so.1.0.0 => /lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007ff76e0a9000)
	libcrypto.so.1.0.0 => /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (0x00007ff76dc64000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff76da47000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff76d6c5000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff76d3bc000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff76d1a6000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff76cddc000)
	/lib64/ld-linux-x86-64.so.2 (0x00007ff76ece7000)
```

In failure mode 1, I see only 1 process stuck in libmysqlclient, in failure mode 2 only 3. Could that explain Kamailio to be deadlocked completely (on either TLS or UDP level) even though there are more workers available?

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