Program terminated with signal 11, Segmentation fault.
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#0  0xb7ef225b in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt full
#0  0xb7ef225b in strlen () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#1  0xb7ec1812 in vfprintf () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb7ee2c04 in vsnprintf () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3  0x0815d68e in __ast_str_helper (buf=0xb79bb270, max_len=8192, append=0, fmt=0xb7a81638 "Null stimer in proc_session_timer - %s\n", ap=0xb79bb294 ": \"4��\233���\025\b\233�") at utils.c:1491
        res = 136849960
        need = 258721
        offset = 0
#4  0x080ee791 in ast_log (level=3, file=0xb7a72114 "chan_sip.c", line=18562, function=0xb7a81624 "proc_session_timer", fmt=0xb7a81638 "Null stimer in proc_session_timer - %s\n") at logger.c:1040
        __res = -1208598810
        logmsg = (struct logmsg *) 0x0
        buf = (struct ast_str *) 0x8282a28
        tm = {tm_sec = -1214530672, tm_min = -1214533064, tm_hour = -1208598810, tm_mday = 136366236, tm_mon = -1209615860, tm_year = -1214533016, tm_wday = 135642541, tm_yday = 1, tm_isdst = 2088,
  tm_gmtoff = -1214533032, tm_zone = 0xb7fcaff4 "\234�\024", tm_usec = 0}
        tv = {tv_sec = 1214253411, tv_usec = 258721}
        res = 0
        ap = 0xb79bb294 ": \"4��\233���\025\b\233�"
        __PRETTY_FUNCTION__ = "ast_log"
#5  0xb7a6038b in proc_session_timer (vp=0x82e4e18) at chan_sip.c:18562
        p = (struct sip_pvt *) 0x82e4e18
        sendreinv = 0
        __PRETTY_FUNCTION__ = "proc_session_timer"
#6  0x08148838 in ast_sched_runq (con=0xb7b326b0) at sched.c:365
        current = (struct sched *) 0xb6457970
        tv = {tv_sec = 1214253411, tv_usec = 259719}
        numevents = 0
        res = 0
        __PRETTY_FUNCTION__ = "ast_sched_runq"
#7  0xb7a5fbff in do_monitor (data=0x0) at chan_sip.c:18465
        res = 1
        dialog = (struct sip_pvt *) 0x0
        t = 1214253411
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#8  0x0815c3b9 in dummy_start (data=0xb7b38878) at utils.c:872
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {-1209565196, 0, -1214530672, -1214532648, 593936529, 1065697262}, __mask_was_saved = 0}}, __pad = {0xb79bb490, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x8075009 <ast_unregister_thread>
        __cancel_arg = (void *) 0xb79bbb90
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0xb7a5f7a0 <do_monitor>, data = 0x0, name = 0xb7b38910 "do_monitor", ' ' <repeats 11 times>, "started at [18493] chan_sip.c restart_monitor()"}
        lock_info = (struct thr_lock_info *) 0x820c090
        mutex_attr = {__size = "\001\000\000", __align = 1}
        __PRETTY_FUNCTION__ = "dummy_start"
#9  0xb7e684fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#10 0xb7f56e5e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.