[kamailio/kamailio] http_client/http_async_client crash at startup if used with tls and openssl 1.1 (Issue #2912)
### Description
When attempting to use either http_client or http_async_client with tls support enabled and openssl version 1.1.x, Kamailio crashes at startup.
If openssl is reverted to version 1.0.2r as described in #1860, the issue does not occur.
#### Reproduction
On a system using openssl version 1.1.x (e.g. 1.1.1l) start Kamailio 5.5.2 with this config file for http_client failure:
[kamailio.cfg.txt](https://github.com/kamailio/kamailio/files/7442436/kamailio.cfg.txt)
To test http_async_client, load pv.so and http_async_client.so instead of http_client.so.
#### Debugging Data
[bt.txt](https://github.com/kamailio/kamailio/files/7442493/bt.txt)
#### Log Messages
[kam.log.txt](https://github.com/kamailio/kamailio/files/7442496/kam.log.txt)
### Additional Information
* **Kamailio Version**:
[kamversion.txt](https://github.com/kamailio/kamailio/files/7442506/kamversion.txt)
* **Operating System**:
Linux 5.4.0-89-generic #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
[os.txt](https://github.com/kamailio/kamailio/files/7442509/os.txt)
confirmed, reproduced with docker focal image
output of ```kamailio -ddd``` [k.log](https://github.com/kamailio/kamailio/files/7581879/k.log)
``` libcurl4: 7.68.0-1ubuntu2.7 libssl1.1: 1.1.1f-1ubuntu2.9 ```
@grumvalski do you have any clues why this is happening?
Unfortunately I had no chance to look at it. Everywhere where I'm using tls and http_async_client or http_client I'm sticking to libssl1.0.x. I'll try to look at it as I can.
I got a bit of time to look at it on an Ubuntu 20.04 and it seems a similar case to one that was solved a while ago:
* https://github.com/kamailio/kamailio/issues/2560#issuecomment-777590116
In short, kamailio has to be started with `--atexit=no` cli param.
I added a note in the readme of the tls module:
* https://github.com/kamailio/kamailio/commit/8dc18cab5bc32c1d34a9113242d230b7...
I tested with the minimal config from the description of this issues, it crashes without `--atexit=no` and with it goes till errors related to not finding the certificate/key files.
This fixes the issue for me. Thank you.
Thanks for testing and reporting back! Probably the cli param has to be added to systemd units, iirc, it was done for rpms.
I am closing it.
Closed #2912.
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Daniel-Constantin Mierla -
Federico Cabiddu
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kdanderso
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Victor Seva