[sr-dev] [kamailio/kamailio] http_async_client: memory mismanagement (#1407)

Giacomo Vacca notifications at github.com
Thu Sep 27 14:58:09 CEST 2018

I've been able to reproduce the crash that lead to Dragos analysis and this PR, both in debian 8 and in CentOS 7.

But I tracked it down to a different cause, which is `libcurl` crashing when using the threaded resolver for DNS lookups. This happens even with latest `libcurl`.

The work around this was building `libcurl` with `c-ares` resolver, and that proved to solve the issue. This included tests under heavy load (hundreds of requests per second).

I meant to write my findings to the libcurl mailing list and ask for corroboration or indications, but I haven't had time yet, as bringing up the failing and working scenarios in a clean way to be shared with that ml is very time consuming.

For what concerns this specific Pull Request I haven't done any test/verification. I don't have it in the environments with the c-ares fix and there are no crashes, so perhaps it's not needed.
The only thing I can suggest is that next time I do the load testing, I use the patch in this PR to verify there are no side effects.

You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-dev/attachments/20180927/6b9f060e/attachment.html>

More information about the sr-dev mailing list