Bug 407796

Summary: System tray crashing frequently causing icons to disappear
Product: [Frameworks and Libraries] frameworks-kded Reporter: Sipho Mateke <siphomateke>
Component: generalAssignee: David Faure <faure>
Status: RESOLVED DUPLICATE    
Severity: crash CC: arojas, kdelibs-bugs-null
Priority: NOR    
Version First Reported In: 5.58.0   
Target Milestone: ---   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Sipho Mateke 2019-05-21 10:52:55 UTC 
SUMMARY
The system tray is crashing and disappearing frequently. It seems to crash whenever any of the following happens:
- a program attempts to update its system tray icon
- the keyboard brightness, touchpad, or volume keys are pressed
- PrtSc is pressed

Note: When I say system tray, I mean whatver controls the icons from programs like Akregator, Kmail, Telegram, etc. The actual system tray widget does not crash and still shows other icons like Wi-Fi, Clipboard and Audio Volume.

Probably related, I can no longer toggle the touchpad or change brightness using the dedicated keyboard keys. Volume control still works, however. Additionally, after the system tray disappears, I can no longer open system activity using Ctrl+Esc. I assume all these are breaking because they are managed by KDE Daemon which keeps crashing.

STEPS TO REPRODUCE - METHOD 1
1. Open Akregator
2. Make sure Akregator is set to show a tray icon
3. Quit Akregator
4. Open and quit Akregator a few times

OBSERVED RESULT
Each time Akregator is quit and then opened the system tray crashes and disappears.

STEPS TO REPRODUCE - METHOD 2
1. Open a program that uses the system tray to make sure it's working
2. Attempt to toggle the touchpad, change volume, adjust brightness or take a screenshot using the appropriate keyboard keys

OBSERVED RESULT
When one of the aforementioned keys is pressed, the system tray crashes and disappears.

EXPECTED RESULT
The system tray should not disappear.

SOFTWARE/OS VERSIONS
Ubuntu: Kubuntu 19.04 with beta PPA
Linux kernel: 5.0.0-15-generic
KDE Plasma Version: 5.15.90
KDE Frameworks Version: 5.58.0
Qt Version: 5.12.2

ADDITIONAL INFORMATION
Information about crash caused by restarting Akregator:

Application: kded5 (kded5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb19251a100 (LWP 3118))]

Thread 6 (Thread 0x7fb1819b7700 (LWP 3123)):
#0  0x00007fb196cd5729 in __GI___poll (fds=0x7fb1780041a0, nfds=1, timeout=9951) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb194a3fcb6 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb194a3fddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb195ae0063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb195a8b5bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb1958d62c6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb1958d7612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb19561f182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fb196ce1b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fb1826cc700 (LWP 3122)):
#0  0x00007fb196cd5729 in __GI___poll (fds=0x556969259500, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb194a3fcb6 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb194a40042 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb189373c76 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fb194a6898d in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb19561f182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fb196ce1b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fb182ecd700 (LWP 3121)):
#0  0x00007fb196cd5729 in __GI___poll (fds=0x556969274fa0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb194a3fcb6 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb194a3fddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb194a3fe21 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb194a6898d in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb19561f182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fb196ce1b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb18a881700 (LWP 3120)):
#0  0x00007fb196cd5729 in __GI___poll (fds=0x7fb18402bf80, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb194a3fcb6 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb194a3fddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb195ae0063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb195a8b5bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb1958d62c6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb195df9565 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fb1958d7612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fb19561f182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007fb196ce1b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb19126c700 (LWP 3119)):
#0  0x00007fb196cd5729 in __GI___poll (fds=0x7fb19126bca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb1949d3917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb1949d553a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb191e5c6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fb1958d7612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb19561f182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fb196ce1b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb19251a100 (LWP 3118)):
[KCrash Handler]
#5  0x00007fb1949d5326 in xcb_wait_for_reply () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#6  0x00007fb171b2a075 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#7  0x00007fb171b2239a in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#8  0x00007fb171b1c62f in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#9  0x00007fb171b3834d in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#10 0x00007fb195ab6426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fb195ab6426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fb171b2b058 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#13 0x00007fb195ab6426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fb195ac1bd9 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fb195ac1f21 in QSocketNotifier::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fb1966c2551 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fb1966c9930 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fb195a8c8e9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fb195ae0c85 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fb194a3faae in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007fb194a3fd48 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fb194a3fddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fb195ae0047 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fb195a8b5bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fb195a935e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fb196dbc0cb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kded5.so
#27 0x00007fb196beab6b in __libc_start_main (main=0x556967a0f050, argc=1, argv=0x7ffe00fb9418, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe00fb9408) at ../csu/libc-start.c:308
#28 0x0000556967a0f08a in  ()
[Inferior 1 (process 3118) detached]



Information about crash caused by pressing a one of the keyboard volume control keys:

Application: kded5 (kded5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0f3e771100 (LWP 16300))]

Thread 10 (Thread 0x7f0f1f7fe700 (LWP 16309)):
#0  0x00007f0f4187c916 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f0f1f7fdc10, expected=0, futex_word=0x55a944d514f4) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f0f4187c916 in __pthread_cond_wait_common (abstime=0x7f0f1f7fdcc0, mutex=0x55a944d514a0, cond=0x55a944d514c8) at pthread_cond_wait.c:533
#2  0x00007f0f4187c916 in __pthread_cond_timedwait (cond=0x55a944d514c8, mutex=0x55a944d514a0, abstime=0x7f0f1f7fdcc0) at pthread_cond_wait.c:667
#3  0x00007f0f41b346b5 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41b347e6 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41b31de1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f0f177fe700 (LWP 16308)):
#0  0x00007f0f4187c916 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f0f177fdc10, expected=0, futex_word=0x55a944d51020) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f0f4187c916 in __pthread_cond_wait_common (abstime=0x7f0f177fdcc0, mutex=0x55a944d50fd0, cond=0x55a944d50ff8) at pthread_cond_wait.c:533
#2  0x00007f0f4187c916 in __pthread_cond_timedwait (cond=0x55a944d50ff8, mutex=0x55a944d50fd0, abstime=0x7f0f177fdcc0) at pthread_cond_wait.c:667
#3  0x00007f0f41b346b5 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41b347e6 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41b31de1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f0f1ffff700 (LWP 16307)):
#0  0x00007f0f4187c916 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f0f1fffec10, expected=0, futex_word=0x55a944d50bf0) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f0f4187c916 in __pthread_cond_wait_common (abstime=0x7f0f1fffecc0, mutex=0x55a944d50ba0, cond=0x55a944d50bc8) at pthread_cond_wait.c:533
#2  0x00007f0f4187c916 in __pthread_cond_timedwait (cond=0x55a944d50bc8, mutex=0x55a944d50ba0, abstime=0x7f0f1fffecc0) at pthread_cond_wait.c:667
#3  0x00007f0f41b346b5 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41b347e6 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41b31de1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f0f2cf0f700 (LWP 16306)):
#0  0x00007f0f4187c916 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f0f2cf0ec10, expected=0, futex_word=0x55a944d50840) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f0f4187c916 in __pthread_cond_wait_common (abstime=0x7f0f2cf0ecc0, mutex=0x55a944d507f0, cond=0x55a944d50818) at pthread_cond_wait.c:533
#2  0x00007f0f4187c916 in __pthread_cond_timedwait (cond=0x55a944d50818, mutex=0x55a944d507f0, abstime=0x7f0f2cf0ecc0) at pthread_cond_wait.c:667
#3  0x00007f0f41b346b5 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41b347e6 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41b31de1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f0f2dc45700 (LWP 16305)):
#0  0x00007f0f40c964a6 in g_main_context_query () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f0f40c96c37 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f40c96ddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0f41d37063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41ce25bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41b2d2c6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f0f2ea2a700 (LWP 16304)):
#0  0x00007f0f42f27fb4 in __GI___libc_read (nbytes=16, buf=0x7f0f2ea29cd0, fd=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f0f42f27fb4 in __GI___libc_read (fd=16, buf=0x7f0f2ea29cd0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f0f40cdd550 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0f40c9678f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0f40c96c60 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0f40c97042 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f0f355c8c76 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7  0x00007f0f40cbf98d in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f0f2f22b700 (LWP 16303)):
#0  0x00007f0f42f2c729 in __GI___poll (fds=0x55a944c44730, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f0f40c96cb6 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f40c96ddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0f40c96e21 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0f40cbf98d in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f0f36ad6700 (LWP 16302)):
#0  0x00007f0f40c96b91 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f0f40c96ddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f41d37063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f0f41ce25bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0f41b2d2c6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f42050565 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f0f3d4c3700 (LWP 16301)):
#0  0x00007f0f42f2c729 in __GI___poll (fds=0x7f0f3d4c2ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f0f40c2a917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f0f40c2c53a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f0f3e0b36a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f0f41b2e612 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0f41876182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f0f42f38b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f0f3e771100 (LWP 16300)):
[KCrash Handler]
#5  0x00007f0f40c2c326 in xcb_wait_for_reply () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#6  0x00007f0f1e544075 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#7  0x00007f0f1e53c39a in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#8  0x00007f0f1e53662f in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#9  0x00007f0f1e55234d in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#10 0x00007f0f41d0d426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f0f41d0d426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f0f1e545058 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kded_touchpad.so
#13 0x00007f0f41d0d426 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f0f41d18bd9 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f0f41d18f21 in QSocketNotifier::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f0f42919551 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f0f42920930 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f0f41ce38e9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f0f41d37c85 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f0f40c96aae in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f0f40c96d48 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f0f40c96ddc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f0f41d37047 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f0f41ce25bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f0f41cea5e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f0f430130cb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kded5.so
#27 0x00007f0f42e41b6b in __libc_start_main (main=0x55a943509050, argc=1, argv=0x7ffe31193638, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe31193628) at ../csu/libc-start.c:308
#28 0x000055a94350908a in  ()
[Inferior 1 (process 16300) detached]
Comment 1 Antonio Rojas 2019-05-21 11:00:43 UTC 

*** This bug has been marked as a duplicate of bug 407614 ***
Comment 2 Sipho Mateke 2019-05-21 11:06:37 UTC 
Agh, sorry for the duplicate. I should have searched for bugs relating to the touchpad crashing. I did search for system tray icons disappearing but didn't find anything.