It seems that it is caused by an infinite loop of request to itself. That case
normally is captured by using maxfwd module to handle Max-Forwards header and
avoid looping. You should consider adding that in your config, you can see how
it is done in the default kamailio.cfg.
In this case, somehow the length of the outgoing branch request buffer ended up
negative (the invite_len), resulting in an inappropriate size of the buffer
needed to build the correspinding CANCEL. I added safety checks can catch it
with the commit:
*
https://github.com/kamailio/kamailio/commit/c45913497f222c67bcccdbc8724b25bb083c556f
Now is only in the master branch, in a couple of days I will backport if no
issue is reported.
Meanwhile you can test by cherry picking locally the commit in branch 5.2 and
report if works ok or not.
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