Bug 417684

Summary: Krunner random crash
Product: [Plasma] krunner Reporter: Lucas <lcsprz>
Component: generalAssignee: Kai Uwe Broulik <kde>
Status: RESOLVED WORKSFORME    
Severity: crash CC: alexander.lohnau
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.12.9   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Lucas 2020-02-15 02:39:44 UTC 
Application: krunner (5.12.9)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-76-generic x86_64
Distribution: Ubuntu 18.04.4 LTS

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

Just opened Krunner and started typing "slack". It happened before and kept happening until I logged out / restarted my PC.

The crash can be reproduced every time.

-- Backtrace:
Application: krunner (krunner), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
__lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
[Current thread is 1 (Thread 0x7f68adeae800 (LWP 5457))]

Thread 15 (Thread 0x7f685d7fa700 (LWP 12449)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f685d7fa700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f685dffb700 (LWP 12448)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f685dffb700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f685e7fc700 (LWP 12447)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f685e7fc700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f685effd700 (LWP 12446)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f685effd700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f685f7fe700 (LWP 12445)):
[KCrash Handler]
#6  0x00007f68a9796e97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007f68a9798801 in __GI_abort () at abort.c:79
#8  0x00007f68a97e1897 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f68a990eb9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181
#9  0x00007f68a97e890a in malloc_printerr (str=str@entry=0x7f68a9910870 "double free or corruption (out)") at malloc.c:5350
#10 0x00007f68a97efe75 in _int_free (have_lock=0, p=0x7f684812ade0, av=0x7f68a9b43c40 <main_arena>) at malloc.c:4278
#11 0x00007f68a97efe75 in __GI___libc_free (mem=0x7f684812adf0) at malloc.c:3124
#12 0x00007f68a49b3dc3 in  () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#13 0x00007f68a49bc440 in  () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#14 0x00007f68a49b3be9 in KService::~KService() () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#15 0x00007f68a49d07a6 in KServiceTypeTrader::applyConstraints(QList<QExplicitlySharedDataPointer<KService> >&, QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#16 0x00007f68a49d08fa in KServiceTypeTrader::defaultOffers(QString const&, QString const&) const () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#17 0x00007f68a49d0c29 in KServiceTypeTrader::query(QString const&, QString const&) const () at /usr/lib/x86_64-linux-gnu/libKF5Service.so.5
#18 0x00007f687342f270 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/krunner_services.so
#19 0x00007f68828f66d0 in Plasma::AbstractRunner::performMatch(Plasma::RunnerContext&) () at /usr/lib/x86_64-linux-gnu/libKF5Runner.so.5
#20 0x00007f68826d7368 in ThreadWeaver::Executor::run(QSharedPointer<ThreadWeaver::JobInterface> const&, ThreadWeaver::Thread*) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#21 0x00007f68826d5fd0 in ThreadWeaver::Job::execute(QSharedPointer<ThreadWeaver::JobInterface> const&, ThreadWeaver::Thread*) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#22 0x00007f68826d5b2d in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#23 0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f68a77956db in start_thread (arg=0x7f685f7fe700) at pthread_create.c:463
#25 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f68577fe700 (LWP 12444)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f68577fe700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f685ffff700 (LWP 12443)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d7c02 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#9  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#10 0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f68a77956db in start_thread (arg=0x7f685ffff700) at pthread_create.c:463
#12 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f686cb21700 (LWP 12442)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9e878614) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9e8785c0, cond=0x556f9e8785e8) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9e8785e8, mutex=0x556f9e8785c0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68826d3ad5 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#5  0x00007f68826d7ba8 in  () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#6  0x00007f68826d2c8d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#7  0x00007f68826d5a6b in ThreadWeaver::Thread::run() () at /usr/lib/x86_64-linux-gnu/libKF5ThreadWeaver.so.5
#8  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f68a77956db in start_thread (arg=0x7f686cb21700) at pthread_create.c:463
#10 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f686e076700 (LWP 12441)):
#0  0x00007f68a5479649 in g_mutex_lock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f68a5432995 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f68a54334fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f68a5433962 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f686faf40e6 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007f68a545b195 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f68a77956db in start_thread (arg=0x7f686e076700) at pthread_create.c:463
#7  0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f686e877700 (LWP 12440)):
#0  0x00007f68a986cbf9 in __GI___poll (fds=0x556f9f323550, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f68a54335c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f68a54336dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f68a5433721 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f68a545b195 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f68a77956db in start_thread (arg=0x7f686e877700) at pthread_create.c:463
#6  0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f687c81a700 (LWP 12435)):
#0  0x00007f68a779b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f9ed90f44) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f68a779b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f9ed90ef0, cond=0x556f9ed90f18) at pthread_cond_wait.c:502
#2  0x00007f68a779b9f3 in __pthread_cond_wait (cond=0x556f9ed90f18, mutex=0x556f9ed90ef0) at pthread_cond_wait.c:655
#3  0x00007f68a9f7f5ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68acfe06a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f68acfe0b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f68a77956db in start_thread (arg=0x7f687c81a700) at pthread_create.c:463
#8  0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f688d87d700 (LWP 5514)):
#0  0x00007f68a98680b4 in __GI___libc_read (fd=17, buf=0x7f688d87cb70, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f68a54782d0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f68a54330b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f68a5433570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f68a54336dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f68aa1b58ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f68aa15a90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f68a9f7923a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f68acb1d6f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f68a77956db in start_thread (arg=0x7f688d87d700) at pthread_create.c:463
#11 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f6895b52700 (LWP 5479)):
#0  0x00007f68a98680b4 in __GI___libc_read (fd=7, buf=0x7f6895b51b60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f68a54782d0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f68a54330b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f68a5433570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f68a54336dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f68aa1b58ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f68aa15a90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f68a9f7923a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f68ababfd45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f68a77956db in start_thread (arg=0x7f6895b52700) at pthread_create.c:463
#11 0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f68985e6700 (LWP 5472)):
#0  0x00007f68a986cbf9 in __GI___poll (fds=0x7f68985e5ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f68a8c85747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f68a8c8736a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f689b18f5e9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f68a9f7e17d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f68a77956db in start_thread (arg=0x7f68985e6700) at pthread_create.c:463
#6  0x00007f68a987988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f68adeae800 (LWP 5457)):
#0  0x00007f68a98886ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f68a97f0114 in _int_free (have_lock=0, p=0x556f9fe7d380, av=0x7f68a9b43c40 <main_arena>) at malloc.c:4266
#2  0x00007f68a97f0114 in __GI___libc_free (mem=0x556f9fe7d390) at malloc.c:3124
#3  0x00007f68a9fce6e2 in QHashData::free_helper(void (*)(QHashData::Node*)) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f68a9f75eac in QReadWriteLock::~QReadWriteLock() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6882905229 in Plasma::QueryMatch::~QueryMatch() () at /usr/lib/x86_64-linux-gnu/libKF5Runner.so.5
#6  0x00007f6882b2b034 in  () at /usr/lib/x86_64-linux-gnu/libmilou.so.5
#7  0x00007f6882b2f15e in  () at /usr/lib/x86_64-linux-gnu/libmilou.so.5
#8  0x00007f68a9fce6b9 in QHashData::free_helper(void (*)(QHashData::Node*)) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f6882b2dd6d in Milou::SourcesModel::slotMatchesChanged(QList<Plasma::QueryMatch> const&) () at /usr/lib/x86_64-linux-gnu/libmilou.so.5
#10 0x00007f6882b31059 in  () at /usr/lib/x86_64-linux-gnu/libmilou.so.5
#11 0x00007f68aa18b555 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f688290d5d2 in Plasma::RunnerManager::matchesChanged(QList<Plasma::QueryMatch> const&) () at /usr/lib/x86_64-linux-gnu/libKF5Runner.so.5
#13 0x00007f6882911643 in  () at /usr/lib/x86_64-linux-gnu/libKF5Runner.so.5
#14 0x00007f68aa18b555 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f68aa197fc7 in QTimer::timeout(QTimer::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f68aa198328 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f68aa18c07b in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f68ab16c83c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f68ab174104 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f68aa15c8d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f68aa1b4d2e in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f68aa1b5529 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f68a5433417 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f68a5433650 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f68a54336dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f68aa1b588f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f68aa15a90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f68aa1639b4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x0000556f9cb6a881 in  ()
#30 0x00007f68a9779b97 in __libc_start_main (main=0x556f9cb6a460, argc=1, argv=0x7ffc01c0dca8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc01c0dc98) at ../csu/libc-start.c:310
#31 0x0000556f9cb6a90a in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 410101.

Possible duplicates by query: bug 413708, bug 410101, bug 407891, bug 406081, bug 405175.

Reported using DrKonqi
Comment 1 Alexander Lohnau 2020-07-08 10:39:28 UTC 
Is this still reproducible?
Comment 2 Lucas 2020-10-14 00:23:31 UTC 
(In reply to Alexander Lohnau from comment #1)
> Is this still reproducible?

Not anymore, it's been a few months, so I don't remember how it was (seemingly) fixed either.