[sr-dev] [kamailio/kamailio] coredumps possibly generated by DMQ in kamailio v5.1.4 (#1594)

[Daniel-Constantin Mierla]

@charlesrchance - the core2 is generated when sending a KDMQ request, the core1 is generated during cleanup at shut down.

The first thing to sort out with core2 is why sending KDMQ it is done in main process -- either it is a kamailio with fork=no or some procedure done at startup. Sending happens when dialog hash table is still null.

I pushed a safety patch, but overall, dealing with sip traffic should be avoided in main process -- not sure if it is related to dmq in general or the dmq extension for dialog.

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