following is backtrace:

#0  qm_detach_free (frag=0x7f91a4656170, qm=<optimized out>) at mem/q_malloc.c:269

        prev = 0x7f91a4656170

        next = 0x0

#1  qm_malloc (qm=0x7f91a429b000, size=3840) at mem/q_malloc.c:386

        f = 0x7f91a4656170

        hash = -1536859792

#2  0x000000000050977f in shm_malloc (size=3832) at parser/../mem/shm_mem.h:262

        p = <optimized out>

#3  sip_msg_shm_clone (org_msg=0x7f91ae9d7630, sip_msg_len=0x7fff56a2dde0, clone_lumps=0) at sip_msg_clone.c:502

        len = 3832

        hdr = <optimized out>

        new_hdr = <optimized out>

        last_hdr = <optimized out>

        via = <optimized out>

        prm = <optimized out>

        to_prm = <optimized out>

        new_to_prm = <optimized out>

        new_msg = <optimized out>

        p = <optimized out>

        __FUNCTION__ = "sip_msg_shm_clone"

#4  0x00007f91ac989062 in build_cell (p_msg=0x7f91ae9d7630) at h_table.c:372

        new_cell = 0x7f91a4656180

        sip_msg_len = <optimized out>

        old = <optimized out>

        cbs = <optimized out>

        cbs_tmp = <optimized out>

        xold = <optimized out>

#5  0x00007f91ac9b5fc6 in new_t (p_msg=0x7f91ae9d7630) at t_lookup.c:1357

        new_cell = <optimized out>

#6  t_newtran (p_msg=0x7f91ae9d7630) at t_lookup.c:1497

        lret = <optimized out>

        my_err = <optimized out>

        canceled = <optimized out>

        __FUNCTION__ = "t_newtran"

#7  0x00007f91ac9a99e0 in t_forward_cancel (p_msg=0x7f91ae9d7630, proxy=0x0, proto=0, tran=0x7fff56a2e2c0) at t_fwd.c:1607

        t_invite = <optimized out>

        t = 0x0

        ret = <optimized out>

        new_tran = <optimized out>

        dst = {send_sock = 0x63371f, to = {s = {sa_family = 54224, sa_data = "\003\255\221\177\000\000\020\300\220\256\221\177\000"}, sin = {sin_family = 54224, 

              sin_port = 44291, sin_addr = {s_addr = 32657}, sin_zero = "\020\300\220\256\221\177\000"}, sin6 = {sin6_family = 54224, sin6_port = 44291, 

              sin6_flowinfo = 32657, sin6_addr = {__in6_u = {__u6_addr8 = "\020\300\220\256\221\177\000\000\070\261W\000\000\000\000", __u6_addr16 = {49168, 44688, 

                    32657, 0, 45368, 87, 0, 0}, __u6_addr32 = {2928721936, 32657, 5747000, 0}}}, sin6_scope_id = 0}}, id = 0, proto = 96 '`', send_flags = {

            f = 225 '\341', blst_imask = 162 '\242'}}

        host = {s = 0x0, len = 0}

        port = <optimized out>

        __FUNCTION__ = "t_forward_cancel"

#8  0x00007f91ac99ae15 in t_relay_to (p_msg=0x7f91ae9d7630, proxy=0x0, proto=0, replicate=0) at t_funcs.c:264

        ret = 0

        new_tran = <optimized out>

        t = <optimized out>

        dst = {send_sock = 0x0, to = {s = {sa_family = 0, sa_data = '\000' <repeats 13 times>}, sin = {sin_family = 0, sin_port = 0, sin_addr = {s_addr = 0}, 

              sin_zero = "\000\000\000\000\000\000\000"}, sin6 = {sin6_family = 0, sin6_port = 0, sin6_flowinfo = 0, sin6_addr = {__in6_u = {

                  __u6_addr8 = '\000' <repeats 15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0, 0}}}, sin6_scope_id = 0}}, id = 0, 

          proto = 64 '@', send_flags = {f = 243 '\363', blst_imask = 162 '\242'}}

        port = <optimized out>

        host = {s = 0x7fff56a2eab8 "0[*\244\221\177", len = -1398876638}

        __FUNCTION__ = "t_relay_to"