Application: kmix (4) KDE Platform Version: 4.7.95 (4.8 RC1 (4.7.95) (Compiled from sources) Qt Version: 4.7.4 Operating System: Linux 3.1.0-gentoo-r1 x86_64 Distribution: "Gentoo Base System release 2.0.3" -- Information about the crash: Using: KDE 4.7.95 KMix from git (2011-12-31, 09:00 UTC) PulseAudio 0.9.22 Qt 4.7.4 - What I was doing when the application crashed: → Placed the cursor on the kmix systray icon → Scrolled the mousewheel to increase the volume → Clicked on the kmix icon as nothing happened to change the volume in the popup → Used the mousewheel on the stream whose volume I wanted to increase → kmix crashed - Unusual behavior I noticed: → The systray icon showed a completely different (5%) volume than the actual volume of the stream (66%) → Scrolling down made the volume jump to 66% for a splitsecond, then back to 5% where it was stuck then, not possible to modify the volume using the mousewheel → Using the mousewheel on the stream in the popup changes the volume, but the slider doesn't move The crash can be reproduced some of the time. -- Backtrace: Application: KMix (kmix), signal: Segmentation fault [Current thread is 1 (Thread 0x7f7448b6c780 (LWP 13436))] Thread 2 (Thread 0x7f7428277700 (LWP 13437)): #0 0x00007f744846c2fb in *__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f743c1a0585 in g_main_context_poll (n_fds=1, fds=0xad2c50, timeout=<optimized out>, context=0xad10a0, priority=<optimized out>) at gmain.c:3402 #2 g_main_context_iterate (context=0xad10a0, block=1, dispatch=1, self=<optimized out>) at gmain.c:3084 #3 0x00007f743c1a09a4 in g_main_context_iteration (context=0xad10a0, may_block=1) at gmain.c:3152 #4 0x00007f74452d5b74 in QEventDispatcherGlib::processEvents (this=0xad0fb0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424 #5 0x00007f74452ae268 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149 #6 0x00007f74452ae45f in QEventLoop::exec (this=0x7f7428276dc0, flags=...) at kernel/qeventloop.cpp:201 #7 0x00007f74451d76a1 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498 #8 0x00007f7445292450 in QInotifyFileSystemWatcherEngine::run (this=0xacf3b0) at io/qfilesystemwatcher_inotify.cpp:248 #9 0x00007f74451d9ae3 in QThreadPrivate::start (arg=0xacf3b0) at thread/qthread_unix.cpp:331 #10 0x00007f7444f4ea35 in start_thread (arg=0x7f7428277700) at pthread_create.c:301 #11 0x00007f744847443d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 1 (Thread 0x7f7448b6c780 (LWP 13436)): [KCrash Handler] #6 0x0000000000000000 in ?? () #7 0x00007f744877760d in MDWSlider::increaseOrDecreaseVolume (this=0xa99c00, decrease=false) at /var/tmp/portage/kde-base/kmix-9999/work/kmix-9999/kmix/gui/mdwslider.cpp:949 #8 0x00007f744877773e in MDWSlider::eventFilter (this=<optimized out>, obj=<optimized out>, e=<optimized out>) at /var/tmp/portage/kde-base/kmix-9999/work/kmix-9999/kmix/gui/mdwslider.cpp:1166 #9 0x00007f74452aee39 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0xa99850, event=0x7fff3fd79c60) at kernel/qcoreapplication.cpp:902 #10 0x00007f7445eef1d8 in QApplicationPrivate::notify_helper (this=0x636e20, receiver=0xa99850, e=0x7fff3fd79c60) at kernel/qapplication.cpp:4477 #11 0x00007f7445ef3cce in QApplication::notify (this=<optimized out>, receiver=0xa99850, e=0x7fff3fd79c60) at kernel/qapplication.cpp:4097 #12 0x00007f7447a21590 in KApplication::notify (this=0x628c70, receiver=0xa99850, event=0x7fff3fd79c60) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95/kdeui/kernel/kapplication.cpp:311 #13 0x00007f74452aece0 in QCoreApplication::notifyInternal (this=0x628c70, receiver=0xa99850, event=0x7fff3fd79c60) at kernel/qcoreapplication.cpp:787 #14 0x00007f7445f51d31 in sendSpontaneousEvent (event=0x7fff3fd79c60, receiver=0xa99850) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218 #15 QETWidget::translateWheelEvent (this=<optimized out>, global_x=<optimized out>, global_y=<optimized out>, delta=120, buttons=..., modifiers=..., orient=Qt::Vertical) at kernel/qapplication_x11.cpp:4502 #16 0x00007f7445f636bc in QETWidget::translateMouseEvent (this=0xa89290, event=0x7fff3fd7a6f0) at kernel/qapplication_x11.cpp:4279 #17 0x00007f7445f61c1f in QApplication::x11ProcessEvent (this=0x628c70, event=0x7fff3fd7a6f0) at kernel/qapplication_x11.cpp:3590 #18 0x00007f7445f867af in x11EventSourceDispatch (s=0x63a8a0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146 #19 0x00007f743c1a00a2 in g_main_dispatch (context=0x638de0) at gmain.c:2441 #20 g_main_context_dispatch (context=0x638de0) at gmain.c:3011 #21 0x00007f743c1a07e8 in g_main_context_iterate (context=0x638de0, block=1, dispatch=1, self=<optimized out>) at gmain.c:3089 #22 0x00007f743c1a09a4 in g_main_context_iteration (context=0x638de0, may_block=1) at gmain.c:3152 #23 0x00007f74452d5b3c in QEventDispatcherGlib::processEvents (this=0x6033b0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422 #24 0x00007f7445f864c6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204 #25 0x00007f74452ae268 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149 #26 0x00007f74452ae45f in QEventLoop::exec (this=0x7fff3fd7a9f0, flags=...) at kernel/qeventloop.cpp:201 #27 0x00007f74452b1b59 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064 #28 0x00007f7448765a8c in kdemain (argc=1, argv=0x7fff3fd7afb8) at /var/tmp/portage/kde-base/kmix-9999/work/kmix-9999/kmix/apps/main.cpp:76 #29 0x00007f74483c5040 in __libc_start_main (main=0x400781 <main(int, char**)>, argc=1, ubp_av=0x7fff3fd7afb8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3fd7afa8) at libc-start.c:226 #30 0x00000000004006e1 in _start () Reported using DrKonqi
Analysis: Affected line is MDWSlider::increaseOrDecreaseVolume (this=0xa99c00, decrease=false) at /var/tmp/portage/kde-base/kmix-9999/work/kmix-9999/kmix/gui/mdwslider.cpp:949 long inc = volP.volumeSpan() / Mixer::VOLUME_STEP_DIVISOR; It could crash if the reference points to 0. It should not be possible, but the stacktrace looks like it: #6 0x0000000000000000 in ?? ()
This might be an issue with a specific control, e.g. a capture-only control. I know that capture-only controls are somewhat buggy in the Tray (The "unusual behavior" description allows this assumption). I'd like to verify this: For further insight into this, please post the following information: - Which sound backend is used. Please copy the output from KMix menu => Help => Hardware information - The ouput of "amixer" (or "amixer -c 1" or any other number that corresponds to the affected soundcard). - Please try to change the master channel (via context-menu of dock icon) to something else, try again, and report back
I wasn't able yet to reproduce the crash again, but what's odd: The volume isn't locked to 5% when scrolling over the tray icon, but is able to switch between 0% and 5%, but nothing more. Changing the master channel doesn't change much in this behaviour, it is always the same after switching the master channel/restarting kmix: → The used icon indicates 0%-5% volume → Hovering the icon shows the actual volume in the tooltip → Scrolling on the icon locks the volume to 0%-5% Requested information: Hardware Information: Sound drivers supported: PulseAudio + ALSA + OSS + MPRIS2 Sound drivers used: PulseAudio Output of 'amixer' (only 1 soundcard available): Simple mixer control 'Master',0 Capabilities: pvolume pswitch penum Playback channels: Front Left - Front Right Limits: Playback 0 - 74 Mono: Front Left: Playback 56 [76%] [-18.00dB] [on] Front Right: Playback 56 [76%] [-18.00dB] [on] Simple mixer control 'PCM',0 Capabilities: pvolume penum Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [0.00dB] Front Right: Playback 255 [100%] [0.00dB] Simple mixer control 'Mic',0 Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive penum Capture exclusive group: 0 Capture channels: Front Left - Front Right Limits: Capture 0 - 80 Front Left: Capture 1 [1%] [-73.00dB] [on] Front Right: Capture 1 [1%] [-73.00dB] [on] Simple mixer control 'Mic 1',0 Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive penum Capture exclusive group: 0 Capture channels: Front Left - Front Right Limits: Capture 0 - 80 Front Left: Capture 0 [0%] [-74.00dB] [off] Front Right: Capture 0 [0%] [-74.00dB] [off] Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',1 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',2 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on]
Hmm, Pulseaudio backend. Not sure what to make out of this, but I will check.
*** Bug 294142 has been marked as a duplicate of this bug. ***
I have this problem too, and I'm almost shure that this problem occurs after pulseaudio restart. Every time I restart pulseaudio server, kmix crashes on attempt to change volume.
Merging all bug reports that have a backtrace that indicates access to a dead/destroyed MixDevice to Bug 290742 *** This bug has been marked as a duplicate of bug 290742 ***