Bug 378790

Summary:	discover halts or crashes when pressing backspace in the search textbox
Product:	[Applications] Discover	Reporter:	Carmelo Piccione <carmelo.piccione>
Component:	discover	Assignee:	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 Carmelo Piccione 2017-04-14 23:53:23 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:

Searching for content, eg "hang" for google hangouts.  Pressing backspace to make it "han" would often freeze the app. 

- Unusual behavior I noticed:

Freezing of the app or full crash.

The crash can be reproduced sometimes.

-- 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 0x7fd1d16918c0 (LWP 5569))]

Thread 9 (Thread 0x7fd17a7fc700 (LWP 5587)):
#0  0x00007fd1c78f855d in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd1c78fab53 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb49b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd1cd875f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd1cd64cfe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd1c9a2c6da in start_thread (arg=0x7fd17a7fc700) at pthread_create.c:456
#9  0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7fd197fff700 (LWP 5578)):
#0  0x00007fd1ccc44cad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c793fb30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb042 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1c78fb514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd1cd875f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd1cd64cfe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd1c9a2c6da in start_thread (arg=0x7fd197fff700) at pthread_create.c:456
#10 0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7fd19d7c9700 (LWP 5576)):
#0  0x00007fd1ccc4918d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c78fb576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb902 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd19f3c1476 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fd1c7922f65 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd1c9a2c6da in start_thread (arg=0x7fd19d7c9700) at pthread_create.c:456
#6  0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fd19dfca700 (LWP 5575)):
#0  0x00007fd1ccc4918d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c78fb576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1c78fb6d1 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd1c7922f65 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd1c9a2c6da in start_thread (arg=0x7fd19dfca700) at pthread_create.c:456
#6  0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fd1ae6c0700 (LWP 5574)):
#0  0x00007fd1ccc44cad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c793fb30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb042 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1c78fb514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd1cd875f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd1cd64cfe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd1d0a294c6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd1c9a2c6da in start_thread (arg=0x7fd1ae6c0700) at pthread_create.c:456
#11 0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fd1b4851700 (LWP 5572)):
#0  0x00007fd1cd648df9 in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007fd1cd875809 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd1c78faf89 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1c78fb514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd1cd875f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd1cd64cfe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd1ce1d6df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd1c9a2c6da in start_thread (arg=0x7fd1b4851700) at pthread_create.c:456
#11 0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fd1b5a62700 (LWP 5571)):
#0  0x00007fd1ccc4918d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c78fb576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd1cd875f2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd1cd64cfe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd1cf4ab5c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd1c9a2c6da in start_thread (arg=0x7fd1b5a62700) at pthread_create.c:456
#9  0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fd1be3ff700 (LWP 5570)):
#0  0x00007fd1ccc4918d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd1c7490c62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd1c74928d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd1c0956ed9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fd1cd651c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd1c9a2c6da in start_thread (arg=0x7fd1be3ff700) at pthread_create.c:456
#6  0x00007fd1ccc5517f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fd1d16918c0 (LWP 5569)):
[KCrash Handler]
#6  0x00007fd1cd821821 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd1d0aaa6c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fd1d0ab34a3 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fd1d0ab36e1 in QQuickItem::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fd1ced8b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007fd1ced92b11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fd1cd8218a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fd1d0aaa6c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fd1d0ab34a3 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fd1d0ab36e1 in QQuickItem::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fd1ced8b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fd1ced92b11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fd1cd8218a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fd1d0aaa6c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fd1d0ab34a3 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fd1d0ab36e1 in QQuickItem::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007fd1ced8b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007fd1ced92b11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007fd1cd8218a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fd1d0aaa6c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007fd1d0ab34a3 in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007fd1d0ab36e1 in QQuickItem::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007fd1ced8b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007fd1ced92b11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fd1cd8218a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007fd1d0ac6143 in QQuickWindow::sendEvent(QQuickItem*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#32 0x00007fd1d0ac646f in QQuickWindow::keyPressEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#33 0x00007fd1ce603475 in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#34 0x00007fd1d0ace245 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#35 0x00007fd1ced8b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007fd1ced92b11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#37 0x00007fd1cd8218a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007fd1ce5f3d18 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#39 0x00007fd1ce5f9285 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#40 0x00007fd1ce5d723b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#41 0x00007fd1c098d830 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#42 0x00007fd1c78fb377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fd1c78fb5e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007fd1c78fb68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007fd1cd875f0f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007fd1cd81f88a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007fd1cd827ffc in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00005592fff05b16 in  ()
#49 0x00007fd1ccb6d3f1 in __libc_start_main (main=0x5592fff05410, argc=1, argv=0x7ffd7d5695c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd7d5695b8) at ../csu/libc-start.c:291
#50 0x00005592fff05d5a in _start ()

Reported using DrKonqi

Comment 1 Dan Leinir Turthra Jensen 2017-04-18 10:59:44 UTC

Thank you for the backtrace - made it much easier to confirm that this was, in fact, the same bug :) (not entirely clear, don't blame you at all for the duplicate)

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