The most important part of the backtrace - frame 0 - is missing.
If you can reproduce it, is the new core printing the same kind of backtrace, with fame 0
not showing relevant information?
If yes, can you try with debug=3 in kamailio configuration file and paste here the logs
message while executing the http query?
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https://github.com/kamailio/kamailio/issues/432#issuecomment-162669929