Application: kmix (4)
KDE Platform Version: 4.8.2 (4.8.2)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-24-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I have had two crashes so far today since installing Kubuntu 12.04 yesterday (I never noticed this problem with 11.10).  The first time an MP3 file was playing in Amarok, but I was not doing anything that I was not making any changes in any multimedia application at the time.  The second time, Amarok had been paused for an hour or more and I was doing some cleanup in KTorrent.  Both times after restarting I checked the Phonon settings in System Settings and discovered that the list of devices for all settings on the Device Preference tab had been replaced with "PulseAudio Sound Server".  I have three sound devices, CMI8788 that I normally use for Playback, ICE1712 that I occasionally use for recording, and a built-in device on the motherboard that is not connected to anything and never used.  After the first KMix crash I rebooted the system in order to get sound working again.  I have not done so yet this time because I have some background processes running that I don't want to interrupt, but I haven't figured out another way to restart Phonon or the appropriate system.

- Custom settings of the application:
The only thing I am aware of that is unusual about my system is the three sound devices, so I set the preferred order in System Settings to CMI8788, ICE1712, and Built-in for Audio Playback, and ICE1712, CMI8788, and Built-in for Audio Recording.  I've also added the following lines in /etc/modprobe.d/alsa-base.conf because I cannot get Flash to work without them:

options snd-virtuoso index=0
options snd-hda-intel index=1
options snd-ice1712 index=2

The crash does not seem to be reproducible.

-- Backtrace:
Application: KMix (kdeinit4), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd416860780 (LWP 3791))]

Thread 3 (Thread 0x7fd3f4cc3700 (LWP 3795)):
#0  0x00007fd414099b03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fd4113c5ff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd4113c6124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd4154e8426 in QEventDispatcherGlib::processEvents (this=0x7fd3f00008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fd4154b7c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd4154b7ed7 in QEventLoop::exec (this=0x7fd3f4cc2d10, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fd4153b6fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007fd4154979ff in QInotifyFileSystemWatcherEngine::run (this=0x1ab9260) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fd4153b9fcb in QThreadPrivate::start (arg=0x1ab9260) at thread/qthread_unix.cpp:298
#9  0x00007fd404c7ab74 in ?? () from /usr/lib/nvidia-current-updates/libGL.so.1
#10 0x00007fd411a86e9a in start_thread (arg=0x7fd3f4cc3700) at pthread_create.c:308
#11 0x00007fd4140a54bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fd3ebffe700 (LWP 3796)):
#0  __pthread_mutex_lock (mutex=0x7fd3e4000a80) at pthread_mutex_lock.c:127
#1  0x00007fd411401561 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd4113c5824 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd4113c5f6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd4113c6124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd4154e8426 in QEventDispatcherGlib::processEvents (this=0x7fd3e40008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fd4154b7c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fd4154b7ed7 in QEventLoop::exec (this=0x7fd3ebffdd10, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fd4153b6fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007fd4154979ff in QInotifyFileSystemWatcherEngine::run (this=0x1c0a480) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007fd4153b9fcb in QThreadPrivate::start (arg=0x1c0a480) at thread/qthread_unix.cpp:298
#11 0x00007fd404c7ab74 in ?? () from /usr/lib/nvidia-current-updates/libGL.so.1
#12 0x00007fd411a86e9a in start_thread (arg=0x7fd3ebffe700) at pthread_create.c:308
#13 0x00007fd4140a54bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd416860780 (LWP 3791)):
[KCrash Handler]
#6  0x000000000060d620 in QString::shared_null ()
#7  0x00007fd400593e26 in MDWSlider::update (this=0x1bd51c0) at ../../kmix/gui/mdwslider.cpp:1001
#8  0x00007fd40058f64b in ViewDockAreaPopup::refreshVolumeLevels (this=<optimized out>) at ../../kmix/gui/viewdockareapopup.cpp:168
#9  0x00007fd4154cd281 in QMetaObject::activate (sender=0x1bf4840, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#10 0x00007fd4154cd281 in QMetaObject::activate (sender=0x1bf2bf0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#11 0x00007fd400568b0c in Mixer_Backend::readSetFromHW (this=0x1bf2bf0) at ../../kmix/backends/mixer_backend.cpp:155
#12 0x00007fd400578df5 in sink_cb (c=<optimized out>, i=<optimized out>, eol=<optimized out>) at ../../kmix/backends/mixer_pulse.cpp:191
#13 0x00007fd405108944 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#14 0x00007fd40431b693 in ?? () from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
#15 0x00007fd40431ba03 in pa_pdispatch_run () from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
#16 0x00007fd4050febdd in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#17 0x00007fd4043202a9 in ?? () from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
#18 0x00007fd404eecab3 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0
#19 0x00007fd4113c5c9a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007fd4113c6060 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007fd4113c6124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fd4154e83bf in QEventDispatcherGlib::processEvents (this=0x180aaa0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#23 0x00007fd4148e3d5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#24 0x00007fd4154b7c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#25 0x00007fd4154b7ed7 in QEventLoop::exec (this=0x7fff81010b10, flags=...) at kernel/qeventloop.cpp:204
#26 0x00007fd4154bcf67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#27 0x00007fd4005803e2 in kdemain (argc=3, argv=0x179d320) at ../../kmix/apps/main.cpp:76
#28 0x00000000004086a4 in launch (argc=3, _name=0x182cf28 "kmix", args=<optimized out>, cwd=0x0, envc=<optimized out>, envs=<optimized out>, reset_env=false, tty=0x0, avoid_loops=false, startup_id_str=0x40b31e "0") at ../../kinit/kinit.cpp:746
#29 0x0000000000409a16 in handle_launcher_request (sock=8, who=<optimized out>) at ../../kinit/kinit.cpp:1238
#30 0x0000000000409f47 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1431
#31 0x000000000040532f in main (argc=4, argv=0x7fff00000001, envp=0x7fff81012280) at ../../kinit/kinit.cpp:1919

Possible duplicates by query: bug 299361, bug 298528, bug 295835.

Reported using DrKonqi