Asterisk 13 problem call processing

I 'm running Asterisk 13.30 ( Freepbx distro version ) on a VM server :
CPU : 8 cores
The server often works properly but sometimes asterisk stop the call processing with this error :

in this situation, “asterisk -r” command does not respond and just show bash prompt.

no core dump file generated .howto getting a backtrace or find the cause of the problem in this state?,taskprocessorbackups,etc.

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