Bug 379120

Summary: Discover Applications would crash when clicking back button
Product: [Applications] Discover Reporter: Cruz Medina <cruzhm77>
Component: discoverAssignee: Aleix Pol <aleixpol>
Status: RESOLVED DUPLICATE    
Severity: crash CC: admin
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.9.4   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Cruz Medina 2017-04-23 13:54:02 UTC 
Application: plasma-discover (5.9.4)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-19-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
When I would view an application then click the back button, the application would crash.  I could restart the program and repeat several times in a row.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc8342e1440 (LWP 3887))]

Thread 10 (Thread 0x7fc790ff9700 (LWP 3927)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc830284b4b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fc8336ca495 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fc8336cad8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc82c65e6da in start_thread (arg=0x7fc790ff9700) at pthread_create.c:456
#6  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7fc7ed2fb700 (LWP 3902)):
#0  0x00007fc82f876cad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc82a553b30 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f042 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc82a50f514 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc8304a7f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc83027efe3 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc82c65e6da in start_thread (arg=0x7fc7ed2fb700) at pthread_create.c:456
#10 0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7fc7fccd3700 (LWP 3897)):
#0  0x00007fc82f87b18d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc82a50f576 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc8304a7f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc83027efe3 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc82c65e6da in start_thread (arg=0x7fc7fccd3700) at pthread_create.c:456
#8  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7fc7fe9a3700 (LWP 3895)):
#0  0x00007fc82a50c55f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc82a50ea0b in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f49b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc82a50f902 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc800793476 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007fc82a536f65 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fc82c65e6da in start_thread (arg=0x7fc7fe9a3700) at pthread_create.c:456
#7  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fc7ff1a4700 (LWP 3894)):
#0  0x00007fc82f87b18d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc82a50f576 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc82a50f6d1 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc82a536f65 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc82c65e6da in start_thread (arg=0x7fc7ff1a4700) at pthread_create.c:456
#6  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fc8118b5700 (LWP 3893)):
#0  0x00007fc82a554ef4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc82a50f696 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc8304a7f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc83027efe3 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc83365b4c6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc82c65e6da in start_thread (arg=0x7fc8118b5700) at pthread_create.c:456
#8  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fc8135ef700 (LWP 3891)):
#0  0x00007fc82f87b18d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc82a50f576 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc8304a7f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc83027efe3 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc830e08df5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc82c65e6da in start_thread (arg=0x7fc8135ef700) at pthread_create.c:456
#9  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fc818b98700 (LWP 3890)):
#0  0x00007fc82a554ed9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc82a50ea79 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc82a50f49b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc8304a7f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc83027efe3 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc8320dd5c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc82c65e6da in start_thread (arg=0x7fc818b98700) at pthread_create.c:456
#10 0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fc821884700 (LWP 3889)):
#0  0x00007fc82f87b18d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc82a0a4c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc82a0a68d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc82440eed9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc830283c98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc82c65e6da in start_thread (arg=0x7fc821884700) at pthread_create.c:456
#6  0x00007fc82f88717f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fc8342e1440 (LWP 3887)):
[KCrash Handler]
#6  0x00007fc830453821 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc8336dc469 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fc8336e5357 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fc8336e56e1 in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fc8319bd35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007fc8319c4b11 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fc8304538a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fc8336dc469 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fc8336e5357 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fc8336e56e1 in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fc8319bd35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fc8319c4b11 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fc8304538a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fc8336f8143 in QQuickWindow::sendEvent(QQuickItem*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fc8336f858f in QQuickWindow::keyReleaseEvent(QKeyEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fc831235475 in QWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007fc833700245 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007fc8319bd35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007fc8319c4b11 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007fc8304538a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fc831225d18 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#27 0x00007fc83122b285 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#28 0x00007fc83120923b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#29 0x00007fc824445830 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#30 0x00007fc82a50f377 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007fc82a50f5e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007fc82a50f68c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007fc8304a7f0f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007fc83045188a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007fc830459ffc in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00005563fc8d1b16 in ?? ()
#37 0x00007fc82f79f3f1 in __libc_start_main (main=0x5563fc8d1410, argc=1, argv=0x7ffce57e3e08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffce57e3df8) at ../csu/libc-start.c:291
#38 0x00005563fc8d1d5a in _start ()

Possible duplicates by query: bug 379112, bug 379084, bug 378917, bug 378790, bug 378339.

Reported using DrKonqi
Comment 1 Dan Leinir Turthra Jensen 2017-04-24 10:09:56 UTC 
Thank you for the report. This has been fixed, but not yet released.

*** This bug has been marked as a duplicate of bug 378339 ***