-- Started music on hold, class 'default', on SIP/8522-00000132
    -- Stopped music on hold on SIP/XLITE0001-0000012f
    -- Stopped music on hold on SIP/8522-00000132
astrid*CLI> core show locks

=======================================================================
=== Currently Held Locks ==============================================
=======================================================================
===
=== <pending> <lock#> (<file>): <lock type> <line num> <function> <lock name> <lock addr> (times locked)
===
=== Thread ID: -1292625008 (do_monitor           started at [24470] chan_sip.c restart_monitor())
=== ---> Lock #0 (chan_sip.c): MUTEX 23964 handle_request_do &netlock 0xb6796e80 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753d10]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== ---> Lock #1 (channel.c): MUTEX 6211 ast_do_masquerade channels 0x8d4e0c8 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/sbin/asterisk(ast_do_masquerade+0x6e) [0x80b8fba]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== ---> Lock #2 (channel.c): MUTEX 6214 ast_do_masquerade original 0xbd98f48 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/sbin/asterisk(ast_do_masquerade+0x99) [0x80b8fe5]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== ---> Lock #3 (channel.c): MUTEX 6234 ast_do_masquerade clonechan 0xb24bf7d0 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_trylock+0x92) [0x8118289]
        /usr/sbin/asterisk(__ao2_trylock+0x4a) [0x80859da]
        /usr/sbin/asterisk(ast_do_masquerade+0x307) [0x80b9253]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== ---> Waiting for Lock #4 (chan_sip.c): MUTEX 6164 sip_fixup p 0xb24bab10 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/lib/asterisk/modules/chan_sip.so [0xb66fb007]
        /usr/sbin/asterisk(ast_do_masquerade+0x1800) [0x80ba74c]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== --- ---> Locked Here: chan_sip.c line 27632 (sip_set_rtp_peer)
=== -------------------------------------------------------------------
===
=== Thread ID: -1315861616 (pbx_thread           started at [ 5035] pbx.c ast_pbx_start())
=== ---> Lock #0 (chan_sip.c): MUTEX 27632 sip_set_rtp_peer p 0xb24bab10 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/lib/asterisk/modules/chan_sip.so [0xb676b386]
        /usr/sbin/asterisk [0x81580f0]
        /usr/sbin/asterisk(ast_rtp_instance_bridge+0x82c) [0x8158ebf]
        /usr/sbin/asterisk(ast_channel_bridge+0xdcf) [0x80bd4c9]
        /usr/sbin/asterisk(ast_bridge_call+0xd0b) [0x80f5013]
        /usr/lib/asterisk/modules/app_dial.so [0xb66c0cb5]
        /usr/lib/asterisk/modules/app_dial.so [0xb66c1694]
        /usr/sbin/asterisk(pbx_exec+0x1ea) [0x8135f44]
        /usr/sbin/asterisk [0x813f044]
        /usr/sbin/asterisk(ast_spawn_extension+0x53) [0x8140a2f]
        /usr/lib/asterisk/modules/app_macro.so [0xb64745fe]
        /usr/lib/asterisk/modules/app_macro.so [0xb6475854]
        /usr/sbin/asterisk(pbx_exec+0x1ea) [0x8135f44]
        /usr/sbin/asterisk [0x813f044]
        /usr/sbin/asterisk(ast_spawn_extension+0x53) [0x8140a2f]
        /usr/sbin/asterisk [0x81413e4]
        /usr/sbin/asterisk [0x8142e83]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== ---> Waiting for Lock #1 (pbx.c): MUTEX 9467 pbx_builtin_getvar_helper chan 0xb24bf7d0 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/sbin/asterisk(pbx_builtin_getvar_helper+0x5e) [0x8150d38]
        /usr/lib/asterisk/modules/chan_sip.so [0xb66fa369]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67109b0]
        /usr/lib/asterisk/modules/chan_sip.so [0xb676b7c7]
        /usr/lib/asterisk/modules/chan_sip.so [0xb66fb0f6]
        /usr/sbin/asterisk(ast_do_masquerade+0xa67) [0x80b99b3]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== --- ---> Locked Here: channel.c line 6234 (ast_do_masquerade)
=== -------------------------------------------------------------------
===
=== Thread ID: -1316602992 (pbx_thread           started at [ 5035] pbx.c ast_pbx_start())
=== ---> Waiting for Lock #0 (channel.c): MUTEX 6211 ast_do_masquerade channels 0x8d4e0c8 (1)
        /usr/sbin/asterisk(ast_bt_get_addresses+0x19) [0x811e5b6]
        /usr/sbin/asterisk(__ast_pthread_mutex_lock+0x92) [0x8117f3d]
        /usr/sbin/asterisk(__ao2_lock+0x4a) [0x8085888]
        /usr/sbin/asterisk [0x8086583]
        /usr/sbin/asterisk(__ao2_callback+0x56) [0x8086a50]
        /usr/sbin/asterisk(__ao2_unlink+0x40) [0x8086393]
        /usr/sbin/asterisk(ast_do_masquerade+0x3dc) [0x80b9328]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674b605]
        /usr/lib/asterisk/modules/chan_sip.so [0xb674c50d]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6752feb]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6754321]
        /usr/lib/asterisk/modules/chan_sip.so [0xb6753adf]
        /usr/sbin/asterisk(ast_io_wait+0x14d) [0x811285b]
        /usr/lib/asterisk/modules/chan_sip.so [0xb67559dd]
        /usr/sbin/asterisk [0x8194a22]
        /lib/i686/cmov/libpthread.so.0 [0xb731e4c0]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb754e84e]
=== --- ---> Locked Here: channel.c line 6211 (ast_do_masquerade)
=== -------------------------------------------------------------------
===
=======================================================================