[SR-Users] Best practices for troubleshooting deadlocks?

Hello, Very occasionally, we encounter what appear to be deadlocks in all UDP receiver threads. All Kamailio processes are running, but no SIP messages are being processed. On one of our high-volume installation, this happens extremely infrequently -- maybe once every month or two. On these occasions, the operator restarts the proxy before we get a chance to go in and figure out what's going on. So, I'm trying to provide the operator with a procedure to execute prior to restarting the proxy on these occasions, so that we can see a snapshot of where the receiver threads are stuck. As far as I can tell, unless Kamailio itself segfaults, there's no specific PID that one can attach GDB to in order to get an overhead snapshot of all the child processes. Here's what I came up with: --------------------------------------------- #!/bin/bash kamcmd -s /tmp/kamailio_ctl ps > thread_log.txt echo >> thread_log.txt while read PID; do gdb --pid=$PID<<EOF>>thread_log.txt set print elements 0 thread apply all bt full generate-core-file detach EOF done < <(kamcmd -s /tmp/kamailio_ctl ps | grep 'udp receiver' | awk '{print $1}') --------------------------------------------- As far as I can tell, this should give me the most ample visibility into the state of the threads, with further core dumps to inspect if follow-up is needed. Hopefully this will result in some fixes back to the project. However, if there are any other suggestions for information to grab in such a scenario, I'm all ears. Thanks in advance! -- Alex -- Alex Balashov | Principal | Evariste Systems LLC 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/