Bug 384332

Summary:	amarok crash when toggling non-started amarok
Product:	[Applications] amarok	Reporter:	Darin McBride <Tanktalus>
Component:	Playback	Assignee:	Amarok Bugs <amarok-bugs-null>
Status:	RESOLVED FIXED
Severity:	crash	CC:	matej
Priority:	NOR	Keywords:	drkonqi
Version First Reported In:	kf5
Target Milestone:	2.9
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Darin McBride 2017-09-04 03:21:19 UTC

Application: amarok (2.8-git)
 (Compiled from sources)
Qt Version: 5.7.1
Frameworks Version: 5.34.0
Operating System: Linux 4.12.5-gentoo x86_64
Distribution: "NAME=Gentoo"

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

I ran "amarok -t" to play/pause amarok. However, amarok wasn't running, and so the process I was launching crashed.

What I expected: well, not crashing anyway. I was hoping it would notice amarok wasn't running, launch it, and toggle that (i.e., play).

The crash can be reproduced every time.

-- Backtrace:
Application: Amarok (amarok), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3e6deeb740 (LWP 18731))]

Thread 3 (Thread 0x7f3e689e9700 (LWP 18733)):
#0  0x00007f3e7f7ab45d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f3e77e910bc in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f3e5c003020, timeout=-1, context=0x7f3e5c000990) at /var/tmp/portage/dev-libs/glib-2.50.3-r1/work/glib-2.50.3/glib/gmain.c:4228
#2  g_main_context_iterate (context=context@entry=0x7f3e5c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.50.3-r1/work/glib-2.50.3/glib/gmain.c:3924
#3  0x00007f3e77e911cc in g_main_context_iteration (context=0x7f3e5c000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.50.3-r1/work/glib-2.50.3/glib/gmain.c:3990
#4  0x00007f3e8015f4ac in QEventDispatcherGlib::processEvents (this=0x7f3e5c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f3e80102372 in QEventLoop::exec (this=this@entry=0x7f3e689e8e50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007f3e7ff10f2b in QThread::exec (this=this@entry=0x7f3e7a5b2240 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507
#7  0x00007f3e7a52d6e8 in QDBusConnectionManager::run (this=0x7f3e7a5b2240 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007f3e7ff16b89 in QThreadPrivate::start (arg=0x7f3e7a5b2240 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#9  0x00007f3e7e6353b4 in start_thread (arg=0x7f3e689e9700) at pthread_create.c:333
#10 0x00007f3e7f7b455d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f3e6aa4a700 (LWP 18732)):
#0  0x00007f3e7f7ab45d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f3e736de952 in poll (__timeout=-1, __nfds=1, __fds=0x7f3e6aa49d60) at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x1b87c30, cond=cond@entry=0x1b87c70, vector=vector@entry=0x0, count=count@entry=0x0) at /var/tmp/portage/x11-libs/libxcb-1.12-r2/work/libxcb-1.12/src/xcb_conn.c:479
#3  0x00007f3e736e1169 in xcb_wait_for_event (c=0x1b87c30) at /var/tmp/portage/x11-libs/libxcb-1.12-r2/work/libxcb-1.12/src/xcb_in.c:693
#4  0x00007f3e6cde3389 in QXcbEventReader::run (this=0x1b95d40) at qxcbconnection.cpp:1343
#5  0x00007f3e7ff16b89 in QThreadPrivate::start (arg=0x1b95d40) at thread/qthread_unix.cpp:368
#6  0x00007f3e7e6353b4 in start_thread (arg=0x7f3e6aa4a700) at pthread_create.c:333
#7  0x00007f3e7f7b455d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f3e6deeb740 (LWP 18731)):
[KCrash Handler]
#6  QWeakPointer<Phonon::MediaObject>::data (this=0x30) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:604
#7  EngineController::playPause (this=0x0) at /var/tmp/portage/media-sound/amarok-9999/work/amarok-9999/src/EngineController.cpp:607
#8  0x00007f3e81e52fcb in App::handleCliArgs (this=this@entry=0x7ffe621ace50, cwd=...) at /var/tmp/portage/media-sound/amarok-9999/work/amarok-9999/src/App.cpp:313
#9  0x00007f3e81e5321e in App::newInstance (this=0x7ffe621ace50) at /var/tmp/portage/media-sound/amarok-9999/work/amarok-9999/src/App.cpp:605
#10 0x00007f3e81e536c8 in App::continueInit (this=this@entry=0x7ffe621ace50) at /var/tmp/portage/media-sound/amarok-9999/work/amarok-9999/src/App.cpp:424
#11 0x0000000000408647 in main (argc=2, argv=<optimized out>) at /var/tmp/portage/media-sound/amarok-9999/work/amarok-9999/src/main.cpp:346

Reported using DrKonqi

Comment 1 Myriam Schweingruber 2017-09-21 10:35:48 UTC

Hm, are you sure these sources are the kf5 version (pre-alpha), not the kde4 one? The kf5 versions is in such an early stage no distro should have it at all, not even in preview.

Comment 2 Darin McBride 2017-09-21 16:22:02 UTC

Yes, I've been running amarok from git for years and years. I get that it's not production-ready, that's always the risk of going straight to the git repo. On the other hand, I've reported a number of pre-release bugs over the years which have helped (I think) get them fixed before being released.

Gentoo has "build from git" as an option for a number of packages, amarok being one.  And there it's specifying the branch to be "kf5", so I'm pretty sure this is the kf5 branch :)  It generally works, too. A couple of minor hiccups here and there, but I get my music, I'm happy.  This particular bug isn't a major impediment or anything, but I thought that you'd want to know about a crash :)

Comment 3 Myriam Schweingruber 2017-09-21 23:34:02 UTC

Thank you for the feedback. Running from git is not the issue, its using pre-released versions as those can break at any time. FWIW, current git from the kde4 branch is much more stable and also runs on Plasma5

Comment 4 Darin McBride 2017-11-13 17:47:22 UTC

Having recompiled git today at commit c9b5bbb727068c2ec616678d1cbc6316c854b530 , this seems to be resolved. Awesome job! Thanks!