=======================================================================
=== Currently Held Locks ==============================================
=======================================================================
===
=== <pending> <lock#> (<file>): <lock type> <line num> <function> <lock name> <lock addr> (times locked)
===
=== Thread ID: 0xb6e91b90 (do_monitor           started at [25036] chan_sip.c restart_monitor())
=== ---> Lock #0 (chan_sip.c): MUTEX 24551 handle_request_do &netlock 0x1d3f80 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x77) [0x811ab97]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b0072]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b20a4]
        /usr/sbin/asterisk(ast_io_wait+0x90) [0x8115a90]
        /usr/lib/asterisk/modules/chan_sip.so [0x16fc5c]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== ---> Lock #1 (chan_sip.c): MUTEX 22802 handle_request_refer p 0x9fe9170 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x77) [0x811ab97]
        /usr/lib/asterisk/modules/chan_sip.so [0x19a181]
        /usr/lib/asterisk/modules/chan_sip.so [0x1af1f2]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b0e80]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b20a4]
        /usr/sbin/asterisk(ast_io_wait+0x90) [0x8115a90]
        /usr/lib/asterisk/modules/chan_sip.so [0x16fc5c]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== ---> Lock #2 (channel.c): MUTEX 6300 ast_do_masquerade channels 0x9c0daf8 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x77) [0x811ab97]
        /usr/sbin/asterisk(ast_do_masquerade+0x6f) [0x80b9aef]
        /usr/lib/asterisk/modules/chan_sip.so [0x19a6eb]
        /usr/lib/asterisk/modules/chan_sip.so [0x1af1f2]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b0e80]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b20a4]
        /usr/sbin/asterisk(ast_io_wait+0x90) [0x8115a90]
        /usr/lib/asterisk/modules/chan_sip.so [0x16fc5c]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== ---> Tried and failed to get Lock #3 (channel.c): MUTEX 6323 ast_do_masquerade clonechan 0xb6e1978 (0)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_trylock+0x76) [0x811d086]
        /usr/sbin/asterisk(ast_do_masquerade+0xde) [0x80b9b5e]
        /usr/lib/asterisk/modules/chan_sip.so [0x19a6eb]
        /usr/lib/asterisk/modules/chan_sip.so [0x1af1f2]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b0e80]
        /usr/lib/asterisk/modules/chan_sip.so [0x1b20a4]
        /usr/sbin/asterisk(ast_io_wait+0x90) [0x8115a90]
        /usr/lib/asterisk/modules/chan_sip.so [0x16fc5c]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]

=== -------------------------------------------------------------------
===
=== Thread ID: 0x1e4cb90 (pbx_thread           started at [ 5079] pbx.c ast_pbx_start())
=== ---> Lock #0 (channel.c): MUTEX 4749 ast_write chan 0xad3ba860 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_trylock+0x76) [0x811d086]
        /usr/sbin/asterisk(ast_write+0x47) [0x80bb5d7]
        /usr/sbin/asterisk [0x80c1037]
        /usr/sbin/asterisk(ast_channel_bridge+0xc82) [0x80c2132]
        /usr/sbin/asterisk(ast_bridge_call+0x347) [0x80f2d07]
        /usr/lib/asterisk/modules/app_dial.so [0x39a862]
        /usr/lib/asterisk/modules/app_dial.so [0x39ce59]
        /usr/sbin/asterisk(pbx_exec+0xcb) [0x8144b6b]
        /usr/sbin/asterisk [0x81537fd]
        /usr/sbin/asterisk [0x8156b54]
        /usr/sbin/asterisk [0x81589f0]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== -------------------------------------------------------------------
===
=== Thread ID: 0x54a0b90 (pbx_thread           started at [ 5079] pbx.c ast_pbx_start())
=== ---> Lock #0 (channel.c): MUTEX 3714 __ast_read chan 0xb6e1978 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x77) [0x811ab97]
        /usr/sbin/asterisk [0x80bed5d]
        /usr/sbin/asterisk [0x80c0cd5]
        /usr/sbin/asterisk(ast_channel_bridge+0xc82) [0x80c2132]
        /usr/sbin/asterisk(ast_bridge_call+0x347) [0x80f2d07]
        /usr/lib/asterisk/modules/app_dial.so [0x39a862]
        /usr/lib/asterisk/modules/app_dial.so [0x39ce59]
        /usr/sbin/asterisk(pbx_exec+0xcb) [0x8144b6b]
        /usr/sbin/asterisk [0x81537fd]
        /usr/sbin/asterisk [0x8156b54]
        /usr/sbin/asterisk [0x81589f0]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== ---> Waiting for Lock #1 (chan_sip.c): MUTEX 7234 sip_read p 0x9fe9170 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x1a) [0x811fada]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x77) [0x811ab97]
        /usr/lib/asterisk/modules/chan_sip.so [0x125eb7]
        /usr/sbin/asterisk [0x80bfefb]
        /usr/sbin/asterisk [0x80c0cd5]
        /usr/sbin/asterisk(ast_channel_bridge+0xc82) [0x80c2132]
        /usr/sbin/asterisk(ast_bridge_call+0x347) [0x80f2d07]
        /usr/lib/asterisk/modules/app_dial.so [0x39a862]
        /usr/lib/asterisk/modules/app_dial.so [0x39ce59]
        /usr/sbin/asterisk(pbx_exec+0xcb) [0x8144b6b]
        /usr/sbin/asterisk [0x81537fd]
        /usr/sbin/asterisk [0x8156b54]
        /usr/sbin/asterisk [0x81589f0]
        /usr/sbin/asterisk [0x8199ec1]
        /lib/libpthread.so.0 [0x676832]
        /lib/libc.so.6(clone+0x5e) [0x5b6e0e]
=== --- ---> Locked Here: chan_sip.c line 22802 (handle_request_refer)
=== -------------------------------------------------------------------
===
=======================================================================