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Thread 641 (Thread 0xb75a0b90 (LWP 10047)):
#0  0xb7f68424 in __kernel_vsyscall ()
#1  0xb7b1dc99 in __lll_lock_wait () from /lib/i686/cmov/libpthread.so.0
#2  0xb7b190d3 in _L_lock_291 () from /lib/i686/cmov/libpthread.so.0
#3  0xb7b18b36 in pthread_mutex_lock () from /lib/i686/cmov/libpthread.so.0
#4  0xb7d599c6 in pthread_mutex_lock () from /lib/i686/cmov/libc.so.6
#5  0x08084703 in _ao2_lock (user_data=0xb13be360, file=0xb372ca82 "chan_sip.c", func=0xb373fce5 "cb_extensionstate", line=12981, var=0xb37317ea "p")
    at /usr/src/asterisk-1.6.2.14/include/asterisk/lock.h:582
#6  0xb36f0971 in cb_extensionstate (context=0xb277e968 "extensions", exten=0xb27ca8d4 "336", state=0, data=0xb13be360) at chan_sip.c:12981
#7  0x0814e206 in handle_statechange (datap=0xb2e6c050) at pbx.c:3926
#8  0x081a649f in tps_processing_function (data=0x8c5faf8) at taskprocessor.c:310
#9  0x081ba032 in dummy_start (data=0x8bf7bb8) at utils.c:968
#10 0xb7b174c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#11 0xb7d4b6de in clone () from /lib/i686/cmov/libc.so.6

Thread 636 (Thread 0xb31e4b90 (LWP 10053)):
#0  0xb7f68424 in __kernel_vsyscall ()
#1  0xb7b1dc99 in __lll_lock_wait () from /lib/i686/cmov/libpthread.so.0
#2  0xb7b190d3 in _L_lock_291 () from /lib/i686/cmov/libpthread.so.0
#3  0xb7b18b36 in pthread_mutex_lock () from /lib/i686/cmov/libpthread.so.0
#4  0xb7d599c6 in pthread_mutex_lock () from /lib/i686/cmov/libc.so.6
#5  0x0814dc6d in ast_rdlock_contexts () at /usr/src/asterisk-1.6.2.14/include/asterisk/lock.h:582
#6  0x08158e44 in ast_hint_extension (c=0xfffffe00, context=0x8230a90 "\002", exten=0x80 <Address 0x80 out of bounds>) at pbx.c:3776
#7  0x08158e76 in ast_get_hint (hint=0xb31e3168 "x1\036�\006\232շ\214V�\b\001", hintsize=80, name=0x0, namesize=0, c=0x0, context=0xb1a2aaae "hints", 
    exten=0xb1a2aaf0 "336") at pbx.c:4179
#8  0xb36efd12 in transmit_state_notify (p=0xb13be360, state=1, full=1, timeout=0) at chan_sip.c:11305
#9  0xb36f0b51 in cb_extensionstate (context=0xb1a2aaae "hints", exten=0xb1a2aaf0 "336", state=1, data=0xb13be360) at chan_sip.c:13000
#10 0xb3714761 in handle_response (p=0xb13be360, resp=200, rest=0xc1ecf90 "OK", req=0xb31e3cd8, seqno=551) at chan_sip.c:18868
#11 0xb3719a0b in handle_incoming (p=0xb13be360, req=0xb31e3cd8, sin=0xb31e4218, recount=0xb31e3ca8, nounlock=0xb31e3ca4) at chan_sip.c:22019
#12 0xb371c1d1 in handle_request_do (req=0xb31e3cd8, sin=0xb31e4218) at chan_sip.c:22401
#13 0xb371f9ab in sipsock_read (id=0x8c62e20, fd=14, events=1, ignore=0x0) at chan_sip.c:22298

#14 0x0811d28e in ast_io_wait (ioc=0xb6e94ec8, howlong=5) at io.c:288
#15 0xb372a296 in do_monitor (data=0x0) at chan_sip.c:22860
#16 0x081ba032 in dummy_start (data=0xb6ea4ab8) at utils.c:968
#17 0xb7b174c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#18 0xb7d4b6de in clone () from /lib/i686/cmov/libc.so.6