Attach **kamailio syslog** when crash:
#### BEFORE_patch.syslog
```
Aug 26 13:45:42 SIP-B03 kernel: [29523793.119992] kamailio[106903]: segfault at 0 ip
00007fdc4c1e03bf sp 00007ffff51d9450 error 4 in libjson.so.0.1.0[7fdc4c1dc000+9000]
Aug 26 13:45:42 SIP-B03 /home/pkg/kamailio/sbin/kamailio[106853]: ALERT: <core>
[main.c:728]: handle_sigs(): child process 106903 exited by a signal 11
```
#### AFTER_patch.syslog
```
Aug 26 13:53:49 SIP-B03 /home/pkg/kamailio/sbin/kamailio[108633]: : <core>
[mem/f_malloc.c:562]: fm_free(): BUG: fm_free: bad pointer 0x7fc30000000b (out of memory
block!), called from jsonrpc-c: jsonrpc_io.c: free_pipe_cmd(553) - aborting
Aug 26 13:53:50 SIP-B03 /home/pkg/kamailio/sbin/kamailio[108583]: ALERT: <core>
[main.c:728]: handle_sigs(): child process 108633 exited by a signal 6
```
---
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https://github.com/kamailio/kamailio/issues/296#issuecomment-134872654