Application: knotify4 (4.0)
KDE Platform Version: 4.4.5 (KDE 4.4.5)
Qt Version: 4.6.3
Operating System: Linux 2.6.35-rc6-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

-- Information about the crash:
I have noticed that knotify is crashing on some notifications, sometimes. For me, I have seen the knotify crashes when korganizer reminders pop-up.
I haven't seen knotify crashing in other notifications like kmail.

The crash can be reproduced some of the time.

 -- Backtrace:
Application: KNotify (knotify4), signal: Aborted
[Current thread is 1 (Thread 0x7f7f4ea15760 (LWP 3724))]

Thread 7 (Thread 0x7f7f379d2710 (LWP 3968)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f7f4c0fd498 in _L_lock_9590 () from /lib/libc.so.6
#2  0x00007f7f4c0fb881 in *__GI___libc_free (mem=0x7f7f4c3e1e40) at malloc.c:3737
#3  0x00007f7f379deef3 in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#4  0x00007f7f3ca2b26c in gst_ring_buffer_open_device () from /usr/lib/libgstaudio-0.10.so.0
#5  0x00007f7f3ca325e5 in ?? () from /usr/lib/libgstaudio-0.10.so.0
#6  0x00007f7f3d2dad5c in gst_element_change_state (element=0x7f7f4c3e1e40, transition=128) at gstelement.c:2546
#7  0x00007f7f3d2ddecb in gst_element_set_state_func (element=0x161fbe0, state=GST_STATE_READY) at gstelement.c:2502
#8  0x00007f7f3d2cbba9 in gst_bin_element_set_state (element=0x1806000, transition=<value optimized out>) at gstbin.c:2136
#9  gst_bin_change_state_func (element=0x1806000, transition=<value optimized out>) at gstbin.c:2435
#10 0x00007f7f3d2dad5c in gst_element_change_state (element=0x7f7f4c3e1e40, transition=128) at gstelement.c:2546
#11 0x00007f7f3d2ddecb in gst_element_set_state_func (element=0x1806000, state=GST_STATE_READY) at gstelement.c:2502
#12 0x00007f7f3d2cbba9 in gst_bin_element_set_state (element=0x1806170, transition=<value optimized out>) at gstbin.c:2136
#13 gst_bin_change_state_func (element=0x1806170, transition=<value optimized out>) at gstbin.c:2435
#14 0x00007f7f3d2dad5c in gst_element_change_state (element=0x7f7f4c3e1e40, transition=128) at gstelement.c:2546
#15 0x00007f7f3d2ddecb in gst_element_set_state_func (element=0x1806170, state=GST_STATE_PAUSED) at gstelement.c:2502
#16 0x00007f7f3dae7fe0 in Phonon::Gstreamer::MediaObject::connectAudio (this=0x18287a0, pad=0x1859800) at ../../gstreamer/mediaobject.cpp:373
#17 0x00007f7f3dae8f9b in Phonon::Gstreamer::MediaObject::newPadAvailable (this=0x18287a0, pad=0x1859800) at ../../gstreamer/mediaobject.cpp:182
#18 0x00007f7f483c750e in g_closure_invoke (closure=0x1682aa0, return_value=0x0, n_param_values=3, param_values=0x1894050, invocation_hint=0x7f7f379d1650) at /glib2.0-2.25.11/gobject/gclosure.c:766
#19 0x00007f7f483de999 in signal_emit_unlocked_R (node=0x18344e0, detail=<value optimized out>, instance=<value optimized out>, emission_return=<value optimized out>, 
    instance_and_params=<value optimized out>) at /glib2.0-2.25.11/gobject/gsignal.c:3252
#20 0x00007f7f483e0116 in g_signal_emit_valist (instance=0x1838170, signal_id=<value optimized out>, detail=0, var_args=0x7f7f379d1840) at /glib2.0-2.25.11/gobject/gsignal.c:2983
#21 0x00007f7f483e0943 in g_signal_emit (instance=0x7f7f4c3e1e40, signal_id=128, detail=22569728) at /glib2.0-2.25.11/gobject/gsignal.c:3040
#22 0x00007f7f320d9b68 in ?? () from /usr/lib/gstreamer-0.10/libgstdecodebin2.so
#23 0x00007f7f320dae30 in ?? () from /usr/lib/gstreamer-0.10/libgstdecodebin2.so
#24 0x00007f7f3d2ef734 in handle_pad_block (pad=0x1a5e4e0) at gstpad.c:3986
#25 0x00007f7f3d2f1c08 in gst_pad_push_event (pad=0x1a5e4e0, event=0x18a1180) at gstpad.c:4931
#26 0x00007f7f355ccdf0 in ?? () from /usr/lib/gstreamer-0.10/libgstvorbis.so
#27 0x00007f7f355cd79b in ?? () from /usr/lib/gstreamer-0.10/libgstvorbis.so
#28 0x00007f7f3d2f3f8d in gst_pad_chain_data_unchecked (pad=0x18a3dc0, is_buffer=1, data=0x18a1ca0) at gstpad.c:4176
#29 0x00007f7f3d2f484e in gst_pad_push_data (pad=0x1a5e060, is_buffer=1, data=0x18a1ca0) at gstpad.c:4405
#30 0x00007f7f32728dc6 in gst_single_queue_push_one (pad=<value optimized out>) at gstmultiqueue.c:919
#31 gst_multi_queue_loop (pad=<value optimized out>) at gstmultiqueue.c:1101
#32 0x00007f7f3d31dabb in gst_task_func (task=0x1884810) at gsttask.c:271
#33 0x00007f7f48f6957f in g_thread_pool_thread_proxy (data=<value optimized out>) at /glib2.0-2.25.11/glib/gthreadpool.c:314
#34 0x00007f7f48f676b4 in g_thread_create_proxy (data=0x1881050) at /glib2.0-2.25.11/glib/gthread.c:1897
#35 0x00007f7f497f28ba in start_thread (arg=<value optimized out>) at pthread_create.c:300
#36 0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#37 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f7f345c3710 (LWP 3975)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f7f3d088629 in gst_data_queue_push (queue=0x18a18a0, item=0x189fc90) at gstdataqueue.c:419
#2  0x00007f7f32727f7b in gst_multi_queue_chain (pad=<value optimized out>, buffer=<value optimized out>) at gstmultiqueue.c:1169
#3  0x00007f7f3d2f3f8d in gst_pad_chain_data_unchecked (pad=0x7f7f2c02a4a0, is_buffer=1, data=0x18a20b0) at gstpad.c:4176
#4  0x00007f7f3d2f484e in gst_pad_push_data (pad=0x1886600, is_buffer=1, data=0x18a20b0) at gstpad.c:4405
#5  0x00007f7f3640b1d8 in ?? () from /usr/lib/gstreamer-0.10/libgstogg.so
#6  0x00007f7f3640d286 in ?? () from /usr/lib/gstreamer-0.10/libgstogg.so
#7  0x00007f7f3640df8a in ?? () from /usr/lib/gstreamer-0.10/libgstogg.so
#8  0x00007f7f364103a3 in ?? () from /usr/lib/gstreamer-0.10/libgstogg.so
#9  0x00007f7f36410a22 in ?? () from /usr/lib/gstreamer-0.10/libgstogg.so
#10 0x00007f7f3d31dabb in gst_task_func (task=0x1884910) at gsttask.c:271
#11 0x00007f7f48f6957f in g_thread_pool_thread_proxy (data=<value optimized out>) at /glib2.0-2.25.11/glib/gthreadpool.c:314
#12 0x00007f7f48f676b4 in g_thread_create_proxy (data=0x7f7f2c023db0) at /glib2.0-2.25.11/glib/gthread.c:1897
#13 0x00007f7f497f28ba in start_thread (arg=<value optimized out>) at pthread_create.c:300
#14 0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f7f34dc4710 (LWP 4839)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f7f4c0fd498 in _L_lock_9590 () from /lib/libc.so.6
#2  0x00007f7f4c0fb881 in *__GI___libc_free (mem=0x7f7f4c3e1e40) at malloc.c:3737
#3  0x00007f7f48f5c88b in magazine_cache_trim (ix=<value optimized out>, magazine_chunks=<value optimized out>, count=<value optimized out>) at /glib2.0-2.25.11/glib/gslice.c:626
#4  magazine_cache_push_magazine (ix=<value optimized out>, magazine_chunks=<value optimized out>, count=<value optimized out>) at /glib2.0-2.25.11/glib/gslice.c:657
#5  0x00007f7f48f5ca63 in private_thread_memory_cleanup (data=<value optimized out>) at /glib2.0-2.25.11/glib/gslice.c:724
#6  0x00007f7f497f1ed9 in __nptl_deallocate_tsd () at pthread_create.c:155
#7  0x00007f7f497f28c8 in start_thread (arg=<value optimized out>) at pthread_create.c:307
#8  0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f7f35fd6710 (LWP 4840)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f7f4c0fd498 in _L_lock_9590 () from /lib/libc.so.6
#2  0x00007f7f4c0fb881 in *__GI___libc_free (mem=0x7f7f4c3e1e40) at malloc.c:3737
#3  0x00007f7f4d462aba in destroy_current_thread_data (p=0x1a35f30) at thread/qthread_unix.cpp:115
#4  0x00007f7f497f1ed9 in __nptl_deallocate_tsd () at pthread_create.c:155
#5  0x00007f7f497f28c8 in start_thread (arg=<value optimized out>) at pthread_create.c:307
#6  0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f7f355c5710 (LWP 6573)):
#0  __pthread_mutex_lock_full (mutex=0x7f7f2c03cab0) at pthread_mutex_lock.c:303
#1  0x00007f7f47961bae in pa_mutex_lock (m=0x7f7f2c03cab0) at pulsecore/mutex-posix.c:90
#2  0x00007f7f4a7cd8e1 in thread (userdata=0x7f7f2c000d70) at pulse/thread-mainloop.c:92
#3  0x00007f7f47962710 in internal_thread_func (userdata=0x7f7f2c022230) at pulsecore/thread-posix.c:72
#4  0x00007f7f497f28ba in start_thread (arg=<value optimized out>) at pthread_create.c:300
#5  0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f7f33dc2710 (LWP 6574)):
#0  0x00007f7f4c149103 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7f4a7cdadf in poll_func (ufds=0x7f7f1c001500, nfds=2, timeout=-1, userdata=0x15862b0) at pulse/thread-mainloop.c:75
#2  0x00007f7f4a7bdb76 in pa_mainloop_poll (m=0x1a2fa20) at pulse/mainloop.c:879
#3  0x00007f7f4a7bef59 in pa_mainloop_iterate (m=0x1a2fa20, block=<value optimized out>, retval=0x0) at pulse/mainloop.c:961
#4  0x00007f7f4a7bf010 in pa_mainloop_run (m=0x1a2fa20, retval=0x0) at pulse/mainloop.c:979
#5  0x00007f7f4a7cd8eb in thread (userdata=0x1a41470) at pulse/thread-mainloop.c:94
#6  0x00007f7f47962710 in internal_thread_func (userdata=0x1a411c0) at pulsecore/thread-posix.c:72
#7  0x00007f7f497f28ba in start_thread (arg=<value optimized out>) at pthread_create.c:300
#8  0x00007f7f4c15401d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7f4ea15760 (LWP 3724)):
[KCrash Handler]
#5  0x00007f7f4c0b7175 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f7f4c0b9f80 in *__GI_abort () at abort.c:92
#7  0x00007f7f4c0ed2bb in __libc_message (do_abort=<value optimized out>, fmt=<value optimized out>) at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
#8  0x00007f7f4c0f6b16 in malloc_printerr (action=3, str=0x7f7f4c1ada60 "double free or corruption (fasttop)", ptr=<value optimized out>) at malloc.c:6267
#9  0x00007f7f4c0fb88c in *__GI___libc_free (mem=<value optimized out>) at malloc.c:3739
#10 0x00007f7f4a7d2b2e in pa_xfree (p=0x1a2edc0) at pulse/xmalloc.c:131
#11 0x00007f7f4a7af970 in prepend_per_user (l=0x7f7f2c0488e0) at pulse/context.c:648
#12 0x00007f7f4a7b17fb in pa_context_connect (c=0x7f7f2c044ef0, server=0x7f7f2c024320 "", flags=PA_CONTEXT_NOAUTOSPAWN, api=0x0) at pulse/context.c:1007
#13 0x00007f7f379dec9a in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#14 0x00007f7f3ca2b26c in gst_ring_buffer_open_device () from /usr/lib/libgstaudio-0.10.so.0
#15 0x00007f7f3ca325e5 in ?? () from /usr/lib/libgstaudio-0.10.so.0
#16 0x00007f7f3d2dad5c in gst_element_change_state (element=0xe8c, transition=3724) at gstelement.c:2546
#17 0x00007f7f3d2ddecb in gst_element_set_state_func (element=0x7f7f2c036800, state=GST_STATE_READY) at gstelement.c:2502
#18 0x00007f7f3dae0af8 in Phonon::Gstreamer::DeviceManager::canOpenDevice (this=<value optimized out>, element=0x7f7f2c036800) at ../../gstreamer/devicemanager.cpp:149
#19 0x00007f7f3dae0e4e in Phonon::Gstreamer::DeviceManager::createAudioSink (this=0x162a9f0, category=<value optimized out>) at ../../gstreamer/devicemanager.cpp:243
#20 0x00007f7f3dadaf91 in AudioOutput (this=0x7f7f2c0429c0, backend=<value optimized out>, parent=0x1582170) at ../../gstreamer/audiooutput.cpp:56
#21 0x00007f7f3dade42b in Phonon::Gstreamer::Backend::createObject (this=0x1620910, c=<value optimized out>, parent=0x1582170, args=<value optimized out>) at ../../gstreamer/backend.cpp:132
#22 0x00007f7f4dfc0392 in Phonon::Factory::createAudioOutput (parent=0x1582170) at ../../phonon/factory.cpp:343
#23 0x00007f7f4dfb6936 in Phonon::AudioOutputPrivate::createBackendObject (this=0x161be50) at ../../phonon/audiooutput.cpp:133
#24 0x00007f7f4dfb3cd4 in Phonon::AudioOutputPrivate::init (this=0x161be50, c=Phonon::NotificationCategory) at ../../phonon/audiooutput.cpp:106
#25 0x000000000040d0c1 in Player (this=0x1554e18) at ../../knotify/notifybysound.cpp:59
#26 PlayerPool::getPlayer (this=0x1554e18) at ../../knotify/notifybysound.cpp:99
#27 0x000000000040d5fe in NotifyBySound::notify (this=0x15002f0, eventId=443, config=0x7ffff0887610) at ../../knotify/notifybysound.cpp:243
#28 0x0000000000408d23 in KNotify::emitEvent (this=0x7ffff08888c0, e=0x7f7f2c046770) at ../../knotify/knotify.cpp:179
#29 0x0000000000408fe2 in KNotify::event (this=0x7ffff08888c0, event=<value optimized out>, appname=<value optimized out>, contexts=<value optimized out>, title=<value optimized out>, 
    text=<value optimized out>, image=..., actions=..., timeout=-1, winId=0) at ../../knotify/knotify.cpp:128
#30 0x000000000040931f in KNotifyAdaptor::event (this=0x150ac80, event=..., fromApp=..., contexts=<value optimized out>, title=..., text=<value optimized out>, image=..., actions=..., timeout=-1, 
    winId=0) at ../../knotify/knotify.cpp:236
#31 0x0000000000409ffb in KNotifyAdaptor::qt_metacall (this=0x150ac80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff08879a0) at ./knotify.moc:227
#32 0x00007f7f4d890421 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:904
#33 0x00007f7f4d89168b in QDBusConnectionPrivate::activateCall (this=<value optimized out>, object=0x150ac80, flags=273, msg=...) at qdbusintegrator.cpp:816
#34 0x00007f7f4d89210d in QDBusConnectionPrivate::activateObject (this=<value optimized out>, node=<value optimized out>, msg=..., pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1364
#35 0x00007f7f4d8923a8 in QDBusActivateObjectEvent::placeMetaCall (this=0x7f7f2c034b60) at qdbusintegrator.cpp:1477
#36 0x00007f7f4d561e89 in QObject::event (this=0x7ffff08888c0, e=0x7f7f2c034b60) at kernel/qobject.cpp:1248
#37 0x00007f7f4c8f232c in QApplicationPrivate::notify_helper (this=0x13fc990, receiver=0x7ffff08888c0, e=0x7f7f2c034b60) at kernel/qapplication.cpp:4302
#38 0x00007f7f4c8f880b in QApplication::notify (this=0x7ffff08888f0, receiver=0x7ffff08888c0, e=0x7f7f2c034b60) at kernel/qapplication.cpp:4185
#39 0x00007f7f4e420836 in KApplication::notify (this=0x7ffff08888f0, receiver=0x7ffff08888c0, event=0x7f7f2c034b60) at ../../kdeui/kernel/kapplication.cpp:302
#40 0x00007f7f4d55215c in QCoreApplication::notifyInternal (this=0x7ffff08888f0, receiver=0x7ffff08888c0, event=0x7f7f2c034b60) at kernel/qcoreapplication.cpp:726
#41 0x00007f7f4d555804 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x13d5830) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#42 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x13d5830) at kernel/qcoreapplication.cpp:1367
#43 0x00007f7f4d57bbd3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#44 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#45 0x00007f7f48f3e1f2 in g_main_dispatch (context=0x13f9800) at /glib2.0-2.25.11/glib/gmain.c:2119
#46 g_main_context_dispatch (context=0x13f9800) at /glib2.0-2.25.11/glib/gmain.c:2672
#47 0x00007f7f48f42148 in g_main_context_iterate (context=0x13f9800, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at /glib2.0-2.25.11/glib/gmain.c:2750
#48 0x00007f7f48f422fc in g_main_context_iteration (context=0x13f9800, may_block=1) at /glib2.0-2.25.11/glib/gmain.c:2813
#49 0x00007f7f4d57b713 in QEventDispatcherGlib::processEvents (this=0x13d5340, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#50 0x00007f7f4c9a214e in QGuiEventDispatcherGlib::processEvents (this=0xe8c, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#51 0x00007f7f4d550a82 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#52 0x00007f7f4d550e5c in QEventLoop::exec (this=0x7ffff0888810, flags=) at kernel/qeventloop.cpp:201
#53 0x00007f7f4d555aeb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#54 0x0000000000407f0f in main (argc=<value optimized out>, argv=<value optimized out>) at ../../knotify/main.cpp:73

Reported using DrKonqi