(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1  0x00007fa59a93b4a3 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
#2  0x00007fa59a8eed06 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007fa59a8c17d3 in __GI_abort () at abort.c:79
#4  0x00000000006fac4e in qm_debug_check_frag (qm=0x7fa588343000, f=0x7fa58cf9ff40, file=0x7fa59871b6e5 "tlsa: ../tls/tls_init.c", line=326, efile=0x881b19 "core/mem/q_malloc.c", eline=511) at core/mem/q_malloc.c:129
#5  0x00000000006fee76 in qm_free (qmp=0x7fa588343000, p=0x7fa58cf9ff78, file=0x7fa59871b6e5 "tlsa: ../tls/tls_init.c", func=0x7fa59871d090 <__func__.0> "ser_free", line=326, mname=0x7fa59871b6e0 "tlsa")
    at core/mem/q_malloc.c:511
#6  0x000000000070997c in qm_shm_free (qmp=0x7fa588343000, p=0x7fa58cf9ff78, file=0x7fa59871b6e5 "tlsa: ../tls/tls_init.c", func=0x7fa59871d090 <__func__.0> "ser_free", line=326, mname=0x7fa59871b6e0 "tlsa")
    at core/mem/q_malloc.c:1350
#7  0x00007fa59844d337 in ser_free (ptr=0x7fa58cf9ff78, fname=0x7fa59874ea41 "crypto/stack/stack.c", fline=415) at ../tls/tls_init.c:326
#8  0x00007fa598486561 in ssl_cert_clear_certs () from /usr/local/lib64/kamailio/modules/tlsa.so
#9  0x00007fa598486600 in ssl_cert_free () from /usr/local/lib64/kamailio/modules/tlsa.so
#10 0x00007fa5984946f4 in SSL_free () from /usr/local/lib64/kamailio/modules/tlsa.so
#11 0x00007fa598472a64 in tls_h_tcpconn_clean_f (c=0x7fa58cee7e90) at ../tls/tls_server.c:701
#12 0x000000000066ec91 in _tcpconn_free (c=0x7fa58cee7e90) at core/tcp_main.c:1582
#13 0x000000000066ece6 in _tcpconn_rm (c=0x7fa58cee7e90) at core/tcp_main.c:1593
#14 0x0000000000695c77 in tcpconn_destroy_all () at core/tcp_main.c:4766
#15 0x0000000000697e76 in destroy_tcp () at core/tcp_main.c:4952
#16 0x000000000041f243 in cleanup (show_status=1) at main.c:580
#17 0x0000000000420ac1 in shutdown_children (sig=15, show_status=1) at main.c:704
#18 0x0000000000423a67 in handle_sigs () at main.c:802
#19 0x00000000004308b1 in main_loop () at main.c:1900
#20 0x000000000043995c in main (argc=13, argv=0x7ffe4cbd5b98) at main.c:3078