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Observation: most of these faults are in tls_accept() even before the SSL * object is shared and used by multiple workers (in the steady state) — this is strange as we normally associate OpenSSL “problems” with using SSL * in multiple processes.
It seems to be related to (1) error handling and/or (2) handshaking with asymmetric keys.
If anyone is in a position to try with PSK it would be an interesting data point (not sure if kamailio's tls.so can be used with PSK though...).
I have reproduced similar crashes with OpenSSL 3.0.x and most of them occur in tls_accept() in various places with both RSA/ECDSA keys.
For workarounds: you can try tls_wolfssl (disclaimer: I am the contributor of this module) or tlsa/OpenSSL 1.1.1. I don't recommend tlsa/OpenSSL 3.x.x as I can reproduce such crashes in that scenario. For 5.7.2/3 you would have to build these modules yourself.
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