(gdb) t a a bt

Thread 8 (Thread 1077):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6b5f063 in ?? () from /lib/libc.so.6
#2  0xb6b5f2aa in readdir64 () from /lib/libc.so.6
#3  0xb603c4bb in next_file_helper (enumerator=0x822b370, cancellable=0x0, error=0xa27e80cc) at glocalfileenumerator.c:285
#4  g_local_file_enumerator_next_file (enumerator=0x822b370, cancellable=0x0, error=0xa27e80cc) at glocalfileenumerator.c:336
#5  0xb5fa5712 in next_files_thread (res=0x87b9450, object=0x822b370, cancellable=0x0) at gfileenumerator.c:640
#6  0xb5fc61ca in run_in_thread (job=0x87503d0, c=0x0, _data=0x880b5f0) at gsimpleasyncresult.c:843
#7  0xb5fb6b44 in io_job_thread (data=0x87503d0, user_data=0x0) at gioscheduler.c:180
#8  0xb6cd73ab in g_thread_pool_thread_proxy (data=0x8624dd0) at gthreadpool.c:319
#9  0xb6cd4e30 in g_thread_create_proxy (data=0x8924440) at gthread.c:1962
#10 0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#11 0xb6b99c3e in clone () from /lib/libc.so.6

Thread 7 (Thread 1068):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6c3051c in pthread_cond_wait () from /lib/libpthread.so.0
#2  0xb5a7d4f1 in PR_WaitCondVar () from /usr/lib/libnspr4.so
#3  0xb67946da in threadLoop (arg=0x82cca20) at jsgc.cpp:2084
#4  js::GCHelperThread::threadMain (arg=0x82cca20) at jsgc.cpp:2070
#5  0xb5a83a12 in ?? () from /usr/lib/libnspr4.so
#6  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#7  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 6 (Thread 1067):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6b8f465 in poll () from /lib/libc.so.6
#2  0xb5ee6b83 in ?? () from /usr/lib/libpulse.so.0
#3  0xb5ed33ca in pa_mainloop_poll () from /usr/lib/libpulse.so.0
#4  0xb5ed4cc4 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#5  0xb5ed4da4 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#6  0xb5ee6924 in ?? () from /usr/lib/libpulse.so.0
#7  0xb3c20e75 in ?? () from /usr/lib/libpulsecommon-0.9.22.so
#8  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#9  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 5 (Thread 1071):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6c308d4 in pthread_cond_timedwait () from /lib/libpthread.so.0
#2  0xb5dc300f in g_cond_timed_wait_posix_impl (cond=0xb1d4e0e8, entered_mutex=0x8624c40, abs_time=0xabbff198) at gthread-posix.c:242
#3  0xb6c7d594 in g_async_queue_pop_intern_unlocked (queue=0x8624e08, try=0, end_time=0xabbff198) at gasyncqueue.c:415
#4  0xb6cd73e7 in g_thread_pool_wait_for_new_task (data=0x8624dd0) at gthreadpool.c:274
#5  g_thread_pool_thread_proxy (data=0x8624dd0) at gthreadpool.c:308
#6  0xb6cd4e30 in g_thread_create_proxy (data=0x8624e30) at gthread.c:1962
#7  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#8  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 4 (Thread 1065):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6b8f465 in poll () from /lib/libc.so.6
#2  0xb6cbc03c in g_poll (fds=0x82228b8, nfds=1, timeout=-1) at gpoll.c:132
#3  0xb6cabb27 in g_main_context_poll (context=0x8224c00, block=1, dispatch=1, self=<value optimized out>) at gmain.c:3402
#4  g_main_context_iterate (context=0x8224c00, block=1, dispatch=1, self=<value optimized out>) at gmain.c:3084
#5  0xb6cac193 in g_main_loop_run (loop=0x8223ff0) at gmain.c:3297
#6  0xb364963b in ?? () from /usr/lib/gio/modules/libdconfsettings.so
#7  0xb6cd4e30 in g_thread_create_proxy (data=0x8222928) at gthread.c:1962
#8  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#9  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 3 (Thread 1066):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6b8f465 in poll () from /lib/libc.so.6
#2  0xb6cbc03c in g_poll (fds=0xb1d4ff48, nfds=3, timeout=-1) at gpoll.c:132
#3  0xb6cabb27 in g_main_context_poll (context=0x82b9998, block=1, dispatch=1, self=<value optimized out>) at gmain.c:3402
#4  g_main_context_iterate (context=0x82b9998, block=1, dispatch=1, self=<value optimized out>) at gmain.c:3084
#5  0xb6cac193 in g_main_loop_run (loop=0x82b9888) at gmain.c:3297
#6  0xb602696d in gdbus_shared_thread_func (user_data=0x82b9938) at gdbusprivate.c:276
#7  0xb6cd4e30 in g_thread_create_proxy (data=0xb2705dc0) at gthread.c:1962
#8  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#9  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 2 (Thread 1078):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb6c308d4 in pthread_cond_timedwait () from /lib/libpthread.so.0
#2  0xb5dc300f in g_cond_timed_wait_posix_impl (cond=0xb1d4e0e8, entered_mutex=0x8624c40, abs_time=0xa1fe7198) at gthread-posix.c:242
#3  0xb6c7d594 in g_async_queue_pop_intern_unlocked (queue=0x8624e08, try=0, end_time=0xa1fe7198) at gasyncqueue.c:415
#4  0xb6cd73e7 in g_thread_pool_wait_for_new_task (data=0x8624dd0) at gthreadpool.c:274
#5  g_thread_pool_thread_proxy (data=0x8624dd0) at gthreadpool.c:308
#6  0xb6cd4e30 in g_thread_create_proxy (data=0xb2709820) at gthread.c:1962
#7  0xb6c2bd23 in ?? () from /lib/libpthread.so.0
#8  0xb6b99c3e in clone () from /lib/libc.so.6

Thread 1 (Thread 1064):
#0  0xb6732884 in array_extra (cx=0x830e760, mode=MAP, argc=<value optimized out>, vp=0xac8fd140) at jsarray.cpp:2838
#1  0xb67a75ee in CallJSNative (cx=0x830e760, entryFrame=0xac8fd110, inlineCallCount=0, interpMode=JSINTERP_NORMAL) at jscntxtinlines.h:701
#2  js::Interpret (cx=0x830e760, entryFrame=0xac8fd110, inlineCallCount=0, interpMode=JSINTERP_NORMAL) at jsinterp.cpp:4799
#3  0xb67b4553 in js::RunScript (cx=0x830e760, script=0x84c3b28, fp=0xac8fd110) at jsinterp.cpp:653
#4  0xb67b6491 in js::Invoke (cx=0x830e760, argsRef=..., flags=8192) at jsinterp.cpp:740
#5  0xb677fe96 in js::CallOrConstructBoundFunction (cx=0x830e760, argc=1, vp=0xac8fd0d0) at jsfun.cpp:2319
#6  0xb67b659a in CallJSNative (cx=0x830e760, argsRef=..., flags=0) at jscntxtinlines.h:701
#7  js::Invoke (cx=0x830e760, argsRef=..., flags=0) at jsinterp.cpp:703
#8  0xb67b69a6 in js::ExternalInvoke (cx=0x830e760, thisv=..., fval=..., argc=1, argv=0xbfabe520, rval=0xbfabe58c) at jsinterp.cpp:863
#9  0xb6721113 in JS_CallFunctionValue (cx=0x830e760, obj=0x0, fval=18446462631691609664, argc=1, argv=0xbfabe520, rval=0xbfabe58c) at jsapi.cpp:5145
#10 0xb6a14574 in gjs_call_function_value (context=0x830e760, obj=0x0, fval=18446462631691609664, argc=1, argv=0xbfabe520, rval=0xbfabe58c) at gjs/jsapi-util.c:1203
#11 0xb6a20916 in gjs_closure_invoke (closure=0x86b3c20, argc=1, argv=0xbfabe520, retval=0xbfabe58c) at gi/closure.c:267
#12 0xb6a2af53 in closure_marshal (closure=0x86b3c20, return_value=0x0, n_param_values=1, param_values=0x87d1550, invocation_hint=0xbfabe6c4, marshal_data=0xbb) at gi/value.c:124
#13 0xb6d80fe8 in g_closure_invoke (closure=0x86b3c20, return_value=0x0, n_param_values=1, param_values=0x87d1550, invocation_hint=0xbfabe6c4) at gclosure.c:774
#14 0xb6d94d01 in signal_emit_unlocked_R (node=0x822bc20, detail=0, instance=0x867f150, emission_return=0x0, instance_and_params=0x87d1550) at gsignal.c:3342
#15 0xb6d9d4e0 in g_signal_emit_valist (instance=0x867f150, signal_id=187, detail=0,
    var_args=0xbfabe880 "\364\017@\267\364\017@\267P\361g\b\254諿\207D5\267P\361g\b\330R\030\b\235\237\065\267\364\017@\267\364\017@\267\340-s\b\314諿x\256\065\267P\361g\b\206") at gsignal.c:3003
#16 0xb6d9d673 in g_signal_emit (instance=0x867f150, signal_id=187, detail=0) at gsignal.c:3060
#17 0xb734ac35 in _clutter_actor_queue_only_relayout (self=0x867f150) at ./clutter-actor.c:5757
#18 0xb7354487 in clutter_actor_queue_relayout (self=0x867f150) at ./clutter-actor.c:5777
#19 0xb735ae78 in clutter_actor_real_hide (self=0x8732db8) at ./clutter-actor.c:1357
#20 0xb76f6c5f in st_widget_hide (actor=0x8732db8) at st/st-widget.c:753
#21 0xb6d824e4 in g_cclosure_marshal_VOID__VOID (closure=0x822ba68, return_value=0x0, n_param_values=1, param_values=0x87b5c80, invocation_hint=0xbfabeaa4, marshal_data=0xb76f6c00) at gmarshal.c:85
#22 0xb6d7fa68 in g_type_class_meta_marshal (closure=0x822ba68, return_value=0x0, n_param_values=1, param_values=0x87b5c80, invocation_hint=0xbfabeaa4, marshal_data=0x4c) at gclosure.c:885
#23 0xb6d80fe8 in g_closure_invoke (closure=0x822ba68, return_value=0x0, n_param_values=1, param_values=0x87b5c80, invocation_hint=0xbfabeaa4) at gclosure.c:774
#24 0xb6d9427d in signal_emit_unlocked_R (node=0x822baa8, detail=0, instance=0x8732db8, emission_return=0x0, instance_and_params=0x87b5c80) at gsignal.c:3202
#25 0xb6d9d4e0 in g_signal_emit_valist (instance=0x8732db8, signal_id=184, detail=0, var_args=0xbfabec60 "\220\355\253\277\004") at gsignal.c:3003
#26 0xb6d9d673 in g_signal_emit (instance=0x8732db8, signal_id=184, detail=0) at gsignal.c:3060
#27 0xb7356895 in clutter_actor_hide (self=0x8732db8) at ./clutter-actor.c:1401
#28 0xb5e0a71f in ffi_call_SYSV () from /usr/lib/libffi.so.5
#29 0xb5e0a55f in ffi_call () from /usr/lib/libffi.so.5
#30 0xb6a22bea in gjs_invoke_c_function (context=0x830e760, function=<value optimized out>, obj=0xac7f0d38, js_argc=0, js_argv=0xac8fd0d0, js_rval=0xbfabefa8) at gi/function.c:648
#31 0xb6a23616 in function_call (context=0x830e760, js_argc=0, vp=0xac8fd0c0) at gi/function.c:970
#32 0xb67b6625 in CallJSNative (cx=0x830e760, argsRef=..., flags=0) at jscntxtinlines.h:701
#33 js::Invoke (cx=0x830e760, argsRef=..., flags=0) at jsinterp.cpp:696
#34 0xb679df88 in js::Interpret (cx=0x830e760, entryFrame=0xac8fd090, inlineCallCount=0, interpMode=JSINTERP_NORMAL) at jsinterp.cpp:4810
#35 0xb67b4553 in js::RunScript (cx=0x830e760, script=0x8499590, fp=0xac8fd090) at jsinterp.cpp:653
#36 0xb67b6491 in js::Invoke (cx=0x830e760, argsRef=..., flags=8192) at jsinterp.cpp:740
#37 0xb677fe96 in js::CallOrConstructBoundFunction (cx=0x830e760, argc=2, vp=0xac8fd020) at jsfun.cpp:2319
#38 0xb67b659a in CallJSNative (cx=0x830e760, argsRef=..., flags=0) at jscntxtinlines.h:701
#39 js::Invoke (cx=0x830e760, argsRef=..., flags=0) at jsinterp.cpp:703
#40 0xb67b69a6 in js::ExternalInvoke (cx=0x830e760, thisv=..., fval=..., argc=2, argv=0xbfabf780, rval=0xbfabf7e8) at jsinterp.cpp:863
#41 0xb6721113 in JS_CallFunctionValue (cx=0x830e760, obj=0x0, fval=18446462631691610784, argc=2, argv=0xbfabf780, rval=0xbfabf7e8) at jsapi.cpp:5145
#42 0xb6a14574 in gjs_call_function_value (context=0x830e760, obj=0x0, fval=18446462631691610784, argc=2, argv=0xbfabf780, rval=0xbfabf7e8) at gjs/jsapi-util.c:1203
#43 0xb6a20916 in gjs_closure_invoke (closure=0x86aac00, argc=2, argv=0xbfabf780, retval=0xbfabf7e8) at gi/closure.c:267
#44 0xb6a2af53 in closure_marshal (closure=0x86aac00, return_value=0x0, n_param_values=2, param_values=0x862cec8, invocation_hint=0xbfabf920, marshal_data=0x166) at gi/value.c:124
#45 0xb6d80fe8 in g_closure_invoke (closure=0x86aac00, return_value=0x0, n_param_values=2, param_values=0x862cec8, invocation_hint=0xbfabf920) at gclosure.c:774
#46 0xb6d94ab4 in signal_emit_unlocked_R (node=0x86403b0, detail=0, instance=0x86a82a8, emission_return=0x0, instance_and_params=0x862cec8) at gsignal.c:3272
#47 0xb6d9d4e0 in g_signal_emit_valist (instance=0x86a82a8, signal_id=358, detail=0,
    var_args=0xbfabfae0 "\364oq\267\250\202j\b(\373\253\277upp\267\200\242j\b@Up\267Pzc\b0\337t\bDt\276\263\364_ﵸ\202j\bPzc\b8\374\253\277`\322r\267\353op\267\364_\357\265\b\315W\b \374\253\277\070\374\253\277\a\n\355\265\030\256j\bt\373\253\277\250\202j\b_\201\336\265p3c\b") at gsignal.c:3003
#48 0xb6d9d673 in g_signal_emit (instance=0x86a82a8, signal_id=358, detail=0) at gsignal.c:3060
#49 0xb77055f6 in _set_default_source (control=0x86a82a8, stream=<value optimized out>) at gvc/gvc-mixer-control.c:547
#50 0xb7707075 in update_default_source_from_name (context=0x86aae18, i=0xbfabfb74, userdata=0x86a82a8) at gvc/gvc-mixer-control.c:637
#51 update_server (context=0x86aae18, i=0xbfabfb74, userdata=0x86a82a8) at gvc/gvc-mixer-control.c:670
#52 _pa_context_get_server_info_cb (context=0x86aae18, i=0xbfabfb74, userdata=0x86a82a8) at gvc/gvc-mixer-control.c:1356
#53 0xb5ed0a07 in ?? () from /usr/lib/libpulse.so.0
#54 0xb3c0bd46 in ?? () from /usr/lib/libpulsecommon-0.9.22.so
#55 0xb3c0c5c6 in pa_pdispatch_run () from /usr/lib/libpulsecommon-0.9.22.so
#56 0xb5ec50ff in ?? () from /usr/lib/libpulse.so.0
#57 0xb3c10e72 in ?? () from /usr/lib/libpulsecommon-0.9.22.so
#58 0xb3bfc5c8 in ?? () from /usr/lib/libpulsecommon-0.9.22.so
#59 0xb5ef906b in ?? () from /usr/lib/libpulse-mainloop-glib.so.0
#60 0xb6cab3f2 in g_main_dispatch (context=0x80a7ed0) at gmain.c:2441
#61 g_main_context_dispatch (context=0x80a7ed0) at gmain.c:3011
#62 0xb6cabc08 in g_main_context_iterate (context=0x80a7ed0, block=1, dispatch=1, self=<value optimized out>) at gmain.c:3089
#63 0xb6cac193 in g_main_loop_run (loop=0x80a7ff0) at gmain.c:3297
#64 0xb76246d0 in meta_run () from /usr/lib/libmutter.so.0
#65 0x0804a99d in main (argc=1, argv=0xbfac0134) at main.c:571