Hello! we have kamailio 5.2.3 and openssl 1.1.0f. wss connections incoming to kamailio and outgoing sip connections, after some time http request check not getting answer from kamailio. Netstat show increase recieve tcp buffer on connections of kamailio. We set up script which after not response of http check, run SIGSEGV of main process of kamailio. gdb) bt full #0 0x00007fb779279450 in futex_wait (private=<optimized out>, expected=1, futex_word=0x7fb6f78cb964) at ../sysdeps/unix/sysv/linux/futex-internal.h:61 __ret = -512 err = <optimized out> #1 futex_wait_simple (private=<optimized out>, expected=1, futex_word=0x7fb6f78cb964) at ../sysdeps/nptl/futex-internal.h:135 No locals. #2 __pthread_rwlock_wrlock_slow (rwlock=0x7fb6f78cb958) at pthread_rwlock_wrlock.c:67 waitval = 1 result = 0 futex_shared = <optimized out> #3 0x00007fb77995eee9 in CRYPTO_THREAD_write_lock () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 No symbol table info available. #4 0x00007fb779907896 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 No symbol table info available. #5 0x00007fb77990807e in CRYPTO_free_ex_data () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 No symbol table info available. #6 0x00007fb779c65a09 in SSL_free () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1 No symbol table info available. #7 0x00007fb777c022d6 in tls_h_tcpconn_clean (c=0x7fb6fbb73d58) at tls_server.c:655 extra = 0x7fb6fba1a6d0 __func__ = "tls_h_tcpconn_clean" #8 0x0000559ddff2966f in _tcpconn_free (c=0x7fb6fbb73d58) at core/tcp_main.c:1339 __func__ = "_tcpconn_free" #9 0x0000559ddff3c5f7 in tcpconn_put_destroy (tcpconn=0x7fb6fbb73d58) at core/tcp_main.c:3017 __func__ = "tcpconn_put_destroy" #10 0x0000559ddff3e0f2 in send_fd_queue_run (q=0x559de0518bc0 <send2child_q>) at core/tcp_main.c:3210 p = 0x7fb77e19e2c8 t = 0x7fb77e19e2c8 __func__ = "send_fd_queue_run" #11 0x0000559ddff4f61c in tcp_main_loop () at core/tcp_main.c:4548 si = 0x0 r = 10 __func__ = "tcp_main_loop" #12 0x0000559ddfe4e85d in main_loop () at main.c:1753 i = 3 pid = 0 si = 0x0 si_desc = "udp receiver child=2 sock=127.0.0.1:5060 (127.0.0.1:5060)\000\065\060\066\060)\000\000\000\000\200\000\000\000\000\000\000\000\002\000\000\000\000\006\000\000\000\000\000\000\000O \254\177\267\177\000\000p\324\067?\375\177\000\000\060\000\000\000\060\000\000\000\020\325\067?\375\177\000\000\360k\255}\267\177\000" nrprocs = 3 woneinit = 1 __func__ = "main_loop" #13 0x0000559ddfe554ce in main (argc=13, argv=0x7ffd3f37d7a8) at main.c:2696 cfg_stream = 0x559de1c10010 c = -1 r = 0 tmp = 0x7ffd3f37deba "" tmp_len = 32765 port = 1060623840 proto = 32695 options = 0x559de01c2a50 ":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:" ret = -1 seed = 33232859 ---Type <return> to continue, or q <return> to quit--- rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 0 n_lst = 0x0 p = 0xf0b5ff <error: Cannot access memory at address 0xf0b5ff> st = {st_dev = 19, st_ino = 13222, st_nlink = 2, st_mode = 16832, st_uid = 108, st_gid = 112, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0, st_atim = { tv_sec = 1560780032, tv_nsec = 539855841}, st_mtim = {tv_sec = 1565076521, tv_nsec = 998570962}, st_ctim = {tv_sec = 1565076521, tv_nsec = 998570962}, __glibc_reserved = {0, 0, 0}} __func__ = "main" Maybe our problem correlate with https://github.com/kamailio/kamailio/issues/1860