I have similar crash with 5.7.2 also. My backtrace is the following:

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Reading symbols from /usr/local/sbin/kamailio...
[New LWP 2136176]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/local/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f /etc/kamailio/kam'.
Program terminated with signal SIGABRT, Aborted.
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007f005489d859 in __GI_abort () at abort.c:79
#2 0x00005586f8958fd8 in qm_debug_check_frag (qm=0x7f0033444000, f=0x7f0033d878b8, file=0x7f0053828be1 "tls: tls_init.c", line=405, efile=0x5586f8af4f99 "core/mem/q_malloc.c", eline=511) at core/mem/q_malloc.c:129
#3 0x00005586f895d7c1 in qm_free (qmp=0x7f0033444000, p=0x7f0033d878f0, file=0x7f0053828be1 "tls: tls_init.c", func=0x7f005382a410 <func.23589> "ser_free", line=405, mname=0x7f0053828b52 "tls") at core/mem/q_malloc.c:511
#4 0x00005586f8969410 in qm_shm_free (qmp=0x7f0033444000, p=0x7f0033d878f0, file=0x7f0053828be1 "tls: tls_init.c", func=0x7f005382a410 <func.23589> "ser_free", line=405, mname=0x7f0053828b52 "tls") at core/mem/q_malloc.c:1350
#5 0x00007f00537d0287 in ser_free (ptr=0x7f0033d878f0, fname=0x7f0053785398 "../ssl/record/ssl3_buffer.c", fline=176) at tls_init.c:405
#6 0x00007f0053741580 in ?? () from /lib/x86_64-linux-gnu/libssl.so.1.1
#7 0x00007f005373e687 in ?? () from /lib/x86_64-linux-gnu/libssl.so.1.1
#8 0x00007f005375669a in SSL_free () from /lib/x86_64-linux-gnu/libssl.so.1.1
#9 0x00007f0053805f7f in tls_h_tcpconn_clean_f (c=0x7f0033cf8be0) at tls_server.c:703
#10 0x00005586f86f183c in _tcpconn_free (c=0x7f0033cf8be0) at core/tcp_main.c:1583
#11 0x00005586f8708164 in tcpconn_put_destroy (tcpconn=0x7f0033cf8be0) at core/tcp_main.c:3336
#12 0x00005586f870e0c1 in handle_tcp_child (tcp_c=0x7f0053a6cd40, fd_i=-1) at core/tcp_main.c:3806
#13 0x00005586f871a7f9 in handle_io (fm=0x7f0053dd9528, ev=1, idx=-1) at core/tcp_main.c:4623
#14 0x00005586f86dc17b in io_wait_loop_epoll (h=0x5586f8b81dc0 <io_h>, t=5, repeat=0) at core/io_wait.h:1070
#15 0x00005586f871e28f in tcp_main_loop () at core/tcp_main.c:4908
#16 0x00005586f861e69f in main_loop () at main.c:1859
#17 0x00005586f8628e93 in main (argc=14, argv=0x7ffcd38c3938) at main.c:3086

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