Application: kmix (4)
KDE Platform Version: 4.8.1 (4.8.1)
Qt Version: 4.8.0
Operating System: Linux 3.2.0-20-generic x86_64
Distribution: Ubuntu precise (development branch)

-- Information about the crash:
- What I was doing when the application crashed:

I have JUST made this machine, it started out a couple of hours ago as Kubuntu-12.04-BETA-1, I did a FULL upgrade and rebooted.  Then I happened to plug in a USB Audio device (as there were no audio devices at all before this) and BOOM, kmix crashes.  Simple and I bet repeatable.  To get good debugging I had to ad packages that the bug reporter did not load:

apt-get install libpulse-mainloop-glib0-dbg libpulse0-dbg libpulsedsp-dbg
apt-get install libglib2.0-0-dbg

  Then looking around I see lots of crashes soon AFTER the calls to mdwslider, which seems like a good place to look first.

  Enjoy.

-- Backtrace:
Application: KMix (kmix), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc8e6abf780 (LWP 1803))]

Thread 3 (Thread 0x7fc8c6a77700 (LWP 1807)):
#0  0x00007fc8e6377b03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fc8dc1820e6 in g_main_context_poll (n_fds=1, fds=0x7fc8c0002bb0, timeout=-1, context=0x7fc8c00009a0, priority=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3417
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7fc8c00009a0, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3118
#3  g_main_context_iterate (context=0x7fc8c00009a0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
#4  0x00007fc8dc182214 in g_main_context_iteration (context=0x7fc8c00009a0, may_block=1) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3184
#5  0x00007fc8e30fda96 in QEventDispatcherGlib::processEvents (this=0x7fc8c00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fc8e30cd2f2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fc8e30cd547 in QEventLoop::exec (this=0x7fc8c6a76dd0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fc8e2fccf97 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007fc8e30ad06f in QInotifyFileSystemWatcherEngine::run (this=0x23c51c0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007fc8e2fcffbb in QThreadPrivate::start (arg=0x23c51c0) at thread/qthread_unix.cpp:298
#11 0x00007fc8dcce8e9a in start_thread (arg=0x7fc8c6a77700) at pthread_create.c:308
#12 0x00007fc8e63834bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fc8c606b700 (LWP 1817)):
#0  __GI___poll (fds=0x7fc8b40029b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:85
#1  0x00007fc8dc1820e6 in g_main_context_poll (n_fds=1, fds=0x7fc8b40029b0, timeout=-1, context=0x7fc8b40009a0, priority=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3417
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7fc8b40009a0, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3118
#3  g_main_context_iterate (context=0x7fc8b40009a0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
#4  0x00007fc8dc182214 in g_main_context_iteration (context=0x7fc8b40009a0, may_block=1) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3184
#5  0x00007fc8e30fda96 in QEventDispatcherGlib::processEvents (this=0x7fc8b40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fc8e30cd2f2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fc8e30cd547 in QEventLoop::exec (this=0x7fc8c606add0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fc8e2fccf97 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007fc8e30ad06f in QInotifyFileSystemWatcherEngine::run (this=0x21095c0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007fc8e2fcffbb in QThreadPrivate::start (arg=0x21095c0) at thread/qthread_unix.cpp:298
#11 0x00007fc8dcce8e9a in start_thread (arg=0x7fc8c606b700) at pthread_create.c:308
#12 0x00007fc8e63834bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc8e6abf780 (LWP 1803)):
[KCrash Handler]
#6  0x000000000242a440 in ?? ()
#7  0x00007fc8e66a3e26 in MDWSlider::update (this=0x2451700) at ../../kmix/gui/mdwslider.cpp:1001
#8  0x00007fc8e669f64b in ViewDockAreaPopup::refreshVolumeLevels (this=<optimized out>) at ../../kmix/gui/viewdockareapopup.cpp:168
#9  0x00007fc8e30e28f1 in QMetaObject::activate (sender=0x23ea620, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#10 0x00007fc8e30e28f1 in QMetaObject::activate (sender=0x240cfc0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#11 0x00007fc8e6678b0c in Mixer_Backend::readSetFromHW (this=0x240cfc0) at ../../kmix/backends/mixer_backend.cpp:155
#12 0x00007fc8e6688df5 in sink_cb (c=<optimized out>, i=<optimized out>, eol=<optimized out>) at ../../kmix/backends/mixer_pulse.cpp:191
#13 0x00007fc8e4a60944 in context_get_sink_info_callback (pd=<optimized out>, command=<optimized out>, tag=<optimized out>, t=0x249c790, userdata=0x23f5cf0) at pulse/introspect.c:280
#14 0x00007fc8dc6a0693 in run_action (pd=0x245da00, r=0x241d3c0, command=2, ts=0x249c790) at pulsecore/pdispatch.c:279
#15 0x00007fc8dc6a0a03 in pa_pdispatch_run (pd=0x245da00, packet=<optimized out>, creds=0x247aa60, userdata=0x23e8600) at pulsecore/pdispatch.c:331
#16 0x00007fc8e4a56bdd in pstream_packet_callback (p=<optimized out>, packet=0x2434740, creds=0x247aa60, userdata=0x23e8600) at pulse/context.c:335
#17 0x00007fc8dc6a52a9 in do_read (p=0x247a910) at pulsecore/pstream.c:809
#18 do_something (p=0x247a910) at pulsecore/pstream.c:177
#19 0x00007fc8e4844ab3 in dispatch_func (source=0x23f5230, callback=<optimized out>, userdata=<optimized out>) at pulse/glib-mainloop.c:584
#20 0x00007fc8dc181d8a in g_main_dispatch (context=0x2073e30) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:2515
#21 g_main_context_dispatch (context=0x2073e30) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3052
#22 0x00007fc8dc182150 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x2073e30, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3123
#23 g_main_context_iterate (context=0x2073e30, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
#24 0x00007fc8dc182214 in g_main_context_iteration (context=0x2073e30, may_block=1) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3184
#25 0x00007fc8e30fda2f in QEventDispatcherGlib::processEvents (this=0x2039ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#26 0x00007fc8e3de8b1e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007fc8e30cd2f2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007fc8e30cd547 in QEventLoop::exec (this=0x7fffd8f08d70, flags=...) at kernel/qeventloop.cpp:204
#29 0x00007fc8e30d25d7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#30 0x00007fc8e66903e2 in kdemain (argc=1, argv=0x7fffd8f092f8) at ../../kmix/apps/main.cpp:76
#31 0x00007fc8e62b276d in __libc_start_main (main=0x400630 <main(int, char**)>, argc=1, ubp_av=0x7fffd8f092f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd8f092e8) at libc-start.c:226
#32 0x0000000000400661 in _start ()

This bug may be a duplicate of or related to bug 290742, bug 283194.

Possible duplicates by query: bug 296937, bug 296919, bug 296886, bug 296880, bug 296863.

Reported using DrKonqi