Bug 391712

Application: plasmashell (5.12.3)

Qt Version: 5.9.4
Frameworks Version: 5.43.0
Operating System: Linux 4.15.0-10-generic x86_64
Distribution: Ubuntu Bionic Beaver (development branch)

-- Information about the crash:
On a desktop PC, 64-bit, AMD A6-6400K APU with Radeon graphics

Since upgrading from 17.10 to 18.04 Beta 1:

- What I was doing when the application crashed:
Logged in, with no applications started, clicked on Application Launcher button on the default panel, causes plasma to crash.  After plasma restarts, clicking Application Launcher causes another crash.

- Unusual behavior I noticed:
Screen went black and panel disappeared.  Both returned after a few seconds

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f532dcdf800 (LWP 1483))]

Thread 10 (Thread 0x7f5250fc7700 (LWP 3071)):
#0  0x00007f532724cbf9 in __GI___poll (fds=0x7f524c006070, nfds=1, timeout=3379005) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5321d442c9 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5321d443dc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5327ba355b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5327b4867a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f532796728a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5253967747 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5326ad76db in start_thread (arg=0x7f5250fc7700) at pthread_create.c:463
#9  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f52660c7700 (LWP 2630)):
#0  0x00007f5321d897d8 in g_private_get () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f5321d6c200 in g_thread_self () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5321d443cd in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5327ba355b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5327b4867a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f532796728a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f532b6bf086 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5326ad76db in start_thread (arg=0x7f52660c7700) at pthread_create.c:463
#9  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f5277956700 (LWP 2360)):
#0  0x00007f5326add9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5622a8af7410) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5326add9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5622a8af73c0, cond=0x5622a8af73e8) at pthread_cond_wait.c:502
#2  0x00007f5326add9f3 in __pthread_cond_wait (cond=0x5622a8af73e8, mutex=0x5622a8af73c0) at pthread_cond_wait.c:655
#3  0x00007f5300a0e64b in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f5300a0e377 in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f5326ad76db in start_thread (arg=0x7f5277956700) at pthread_create.c:463
#6  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f5278157700 (LWP 2359)):
#0  0x00007f5326add9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5622a88f0a04) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5326add9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5622a88f09b0, cond=0x5622a88f09d8) at pthread_cond_wait.c:502
#2  0x00007f5326add9f3 in __pthread_cond_wait (cond=0x5622a88f09d8, mutex=0x5622a88f09b0) at pthread_cond_wait.c:655
#3  0x00007f5300a0e64b in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f5300a0e377 in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f5326ad76db in start_thread (arg=0x7f5278157700) at pthread_create.c:463
#6  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f530338f700 (LWP 2355)):
#0  0x00007f5326add9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f532d6b0fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5326add9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f532d6b0f68, cond=0x7f532d6b0f90) at pthread_cond_wait.c:502
#2  0x00007f5326add9f3 in __pthread_cond_wait (cond=0x7f532d6b0f90, mutex=0x7f532d6b0f68) at pthread_cond_wait.c:655
#3  0x00007f532d3ba5f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f532d3ba639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f5326ad76db in start_thread (arg=0x7f530338f700) at pthread_create.c:463
#6  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f530d73f700 (LWP 2328)):
#0  0x00007f532724cbf9 in __GI___poll (fds=0x7f52fc003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5321d442c9 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5321d443dc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5327ba355b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5327b4867a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f532796728a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f532ab0ea45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5326ad76db in start_thread (arg=0x7f530d73f700) at pthread_create.c:463
#9  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f530f5a7700 (LWP 1552)):
#0  0x00007f532724cbf9 in __GI___poll (fds=0x7f5304004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5321d442c9 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5321d443dc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5327ba355b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5327b4867a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f532796728a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f532ab0ea45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5326ad76db in start_thread (arg=0x7f530f5a7700) at pthread_create.c:463
#9  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f53152df700 (LWP 1494)):
#0  0x00007f5321d89be9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f5321d43833 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5321d441fb in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5321d443dc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5327ba355b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5327b4867a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f532796728a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5328025d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f5326ad76db in start_thread (arg=0x7f53152df700) at pthread_create.c:463
#10 0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f531789f700 (LWP 1490)):
#0  0x00007f532724cbf9 in __GI___poll (fds=0x7f531789eca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f532c2d3747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f532c2d553a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f531a2721c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f532796c1cd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5326ad76db in start_thread (arg=0x7f531789f700) at pthread_create.c:463
#6  0x00007f532725988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f532dcdf800 (LWP 1483)):
[KCrash Handler]
#6  0x00007f5327176e97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007f5327178801 in __GI_abort () at abort.c:79
#8  0x00007f5327957007 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f525f89c1f6 in  () at /usr/lib/x86_64-linux-gnu/libKF5ActivitiesStats.so.1
#10 0x00007f525f880249 in KActivities::Stats::ResultSet::ResultSet(KActivities::Stats::Query) () at /usr/lib/x86_64-linux-gnu/libKF5ActivitiesStats.so.1
#11 0x00007f525faf5977 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/kicker/libkickerplugin.so
#12 0x00007f525faf0789 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/kicker/libkickerplugin.so
#13 0x00007f525fb1cb69 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/kicker/libkickerplugin.so
#14 0x00007f525fb1e245 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/kicker/libkickerplugin.so
#15 0x00007f532aac19e9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f532aa3e3c1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007f532aa3fd7e in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00007f532aa40a59 in QV4::QObjectMethod::callInternal(QV4::CallData*, QV4::Scope&) const () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007f532aa5989d in QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, int, QV4::CallData*) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f5264020436 in  ()
#21 0x00007f52fc09de98 in  ()
#22 0x0000000000000000 in  ()

Reported using DrKonqi