Application: kontact (5.1.3)

Qt Version: 5.5.1
Frameworks Version: 5.23.0
Operating System: Linux 4.4.0-33-generic x86_64
Distribution: Ubuntu 16.04.1 LTS

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

I was trying to search for an email, then I clicked the "up arrow" next to the progress bar in the bottom right, in order to see details, and then it crashed

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f120d03f940 (LWP 15998))]

Thread 21 (Thread 0x7f1156d92700 (LWP 16086)):
#0  QBasicAtomicOps<8>::testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x4072c28: 0x0) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  QGenericAtomicOps<QBasicAtomicOps<8> >::testAndSetAcquire<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, _q_value=@0x4072c28: 0x0) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:166
#2  QBasicAtomicPointer<QMutexData>::testAndSetAcquire (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, this=this@entry=0x4072c28) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:276
#3  QBasicMutex::fastTryLock (current=<synthetic pointer>, this=this@entry=0x4072c28) at thread/qmutex.h:82
#4  QMutex::lock (this=this@entry=0x4072c28) at thread/qmutex.cpp:212
#5  0x00007f1226e3701f in QMutexLocker::QMutexLocker (m=0x4072c28, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:128
#6  QThreadData::canWaitLocked (this=0x4072c00) at ../../include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:240
#7  postEventSourcePrepare (s=0x7f1150013840, timeout=0x7f1156d91ac4) at kernel/qeventdispatcher_glib.cpp:254
#8  0x00007f121fb0492d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f121fb052cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f1150005b30, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#12 0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f1156d91c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#14 0x00007f1226c0084e in QThreadPrivate::start (arg=0x40220e0) at thread/qthread_unix.cpp:331
#15 0x00007f122032f6fa in start_thread (arg=0x7f1156d92700) at pthread_create.c:333
#16 0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 20 (Thread 0x7f1168d34700 (LWP 16050)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:65
#1  0x00007f12262f4e82 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f121fb0539c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f115c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f1168d33c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x32a6bf0) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f1168d34700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 19 (Thread 0x7f1169936700 (LWP 16047)):
#0  0x00007f121fb49ae4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb054b6 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#3  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f1169935c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#5  0x00007f1226c0084e in QThreadPrivate::start (arg=0x3e08620) at thread/qthread_unix.cpp:331
#6  0x00007f122032f6fa in start_thread (arg=0x7f1169936700) at pthread_create.c:333
#7  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7f11731ea700 (LWP 16029)):
#0  0x00007f12262f4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f121fb0539c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11640008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f11731e9c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2f04d60) at thread/qthread_unix.cpp:331
#7  0x00007f122032f6fa in start_thread (arg=0x7f11731ea700) at pthread_create.c:333
#8  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7f11739eb700 (LWP 16027)):
#0  0x00007f121fb048c0 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb052cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f116c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f11739eac80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2eac0f0) at thread/qthread_unix.cpp:331
#7  0x00007f122032f6fa in start_thread (arg=0x7f11739eb700) at pthread_create.c:333
#8  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7f118d426700 (LWP 16025)):
#0  0x00007f121fb49ac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb04807 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb052cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11780008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f118d425c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2d84e50) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f118d426700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7f118dc27700 (LWP 16023)):
#0  0x00007f12262f4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f121fb0539c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11740008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f118dc26c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2cdf530) at thread/qthread_unix.cpp:331
#7  0x00007f122032f6fa in start_thread (arg=0x7f118dc27700) at pthread_create.c:333
#8  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7f118e428700 (LWP 16021)):
#0  0x00007f12262f09cd in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f121fb48740 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb04e84 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb05340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11800008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f118e427c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2c698f0) at thread/qthread_unix.cpp:331
#9  0x00007f122032f6fa in start_thread (arg=0x7f118e428700) at pthread_create.c:333
#10 0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7f118f7fe700 (LWP 16019)):
#0  0x00007f121fb04b30 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb05317 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f117c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f118f7fdc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2c15c20) at thread/qthread_unix.cpp:331
#7  0x00007f122032f6fa in start_thread (arg=0x7f118f7fe700) at pthread_create.c:333
#8  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7f118ffff700 (LWP 16017)):
#0  0x00007f121fb48722 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb04e84 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb05340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11840008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f118fffec80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2bda9e0) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f118ffff700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f119cd94700 (LWP 16015)):
#0  0x00007f121fb49ac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb04f26 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb05400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f119cd93c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2b4eb40) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f119cd94700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f119d7b3700 (LWP 16013)):
#0  0x00007f12262f4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f121fb0539c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11940008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f119d7b2c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2b1b120) at thread/qthread_unix.cpp:331
#7  0x00007f122032f6fa in start_thread (arg=0x7f119d7b3700) at pthread_create.c:333
#8  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f119dfb4700 (LWP 16010)):
#0  0x00007f121fb49ae4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb04920 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb052cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f119dfb3c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2b1fe30) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f119dfb4700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f119e7b5700 (LWP 16009)):
#0  0x00007f121fb49ac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f121fb04474 in g_main_context_release () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f121fb05356 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11980008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f119e7b4c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1226c0084e in QThreadPrivate::start (arg=0x2b29890) at thread/qthread_unix.cpp:331
#8  0x00007f122032f6fa in start_thread (arg=0x7f119e7b5700) at pthread_create.c:333
#9  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f11a7fff700 (LWP 16005)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f122427faa3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f12245a0541 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f122032f6fa in start_thread (arg=0x7f11a7fff700) at pthread_create.c:333
#4  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f11bce41700 (LWP 16004)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f122427faa3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f12245a0541 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f122032f6fa in start_thread (arg=0x7f11bce41700) at pthread_create.c:333
#4  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f11bd642700 (LWP 16003)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f122427faa3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f12245a0541 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f122032f6fa in start_thread (arg=0x7f11bd642700) at pthread_create.c:333
#4  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f11bde62700 (LWP 16002)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f122427ea74 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f12245a0541 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f122032f6fa in start_thread (arg=0x7f11bde62700) at pthread_create.c:333
#4  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f11c026c700 (LWP 16001)):
#0  0x00007f1226bf89aa in QBasicAtomicOps<8>::testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x2734ed8: 0x1) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  QGenericAtomicOps<QBasicAtomicOps<8> >::testAndSetAcquire<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, _q_value=@0x2734ed8: 0x1) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:166
#2  QBasicAtomicPointer<QMutexData>::testAndSetAcquire (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, this=0x2734ed8, this@entry=0x1) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:276
#3  QBasicMutex::fastTryLock (current=<synthetic pointer>, this=0x2734ed8, this@entry=0x1) at thread/qmutex.h:82
#4  QMutex::lock (this=this@entry=0x2734ed8) at thread/qmutex.cpp:212
#5  0x00007f1226e3701f in QMutexLocker::QMutexLocker (m=0x2734ed8, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:128
#6  QThreadData::canWaitLocked (this=0x2734eb0) at ../../include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:240
#7  postEventSourcePrepare (s=0x7f11b80012d0, timeout=0x7f11c026bac4) at kernel/qeventdispatcher_glib.cpp:254
#8  0x00007f121fb0492d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f121fb052cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f1226e37a9b in QEventDispatcherGlib::processEvents (this=0x7f11b80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#12 0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7f11c026bc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f1226bfb8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#14 0x00007f1226c0084e in QThreadPrivate::start (arg=0x2710b50) at thread/qthread_unix.cpp:331
#15 0x00007f122032f6fa in start_thread (arg=0x7f11c026c700) at pthread_create.c:333
#16 0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f12035ef700 (LWP 16000)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f122457088b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f12245708c9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f122032f6fa in start_thread (arg=0x7f12035ef700) at pthread_create.c:333
#4  0x00007f1226300b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f120d03f940 (LWP 15998)):
[KCrash Handler]
#6  0x00007f120ca297e1 in QXcbWindow::mapToNative (this=<optimized out>, rect=..., screen=0x263ecb0) at qxcbwindow.cpp:198
#7  0x00007f120ca300a3 in QXcbWindow::setGeometry (this=0x2b38b20, rect=...) at qxcbwindow.cpp:715
#8  0x00007f1227961add in QWidgetPrivate::setGeometry_sys (this=this@entry=0x2731b10, x=<optimized out>, y=<optimized out>, w=545, h=70, isMove=<optimized out>, isMove@entry=false) at kernel/qwidget.cpp:7171
#9  0x00007f1227961dcc in QWidget::resize (this=0x2721d80, s=...) at kernel/qwidget.cpp:7078
#10 0x00007f12252eada5 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5Libkdepim.so.5
#11 0x00007f122796a5de in QWidget::event (this=this@entry=0x29260c0, event=event@entry=0x7fff9eebbbe0) at kernel/qwidget.cpp:8839
#12 0x00007f1227a68b5e in QFrame::event (this=0x29260c0, e=0x7fff9eebbbe0) at widgets/qframe.cpp:540
#13 0x00007f1226de1412 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x2619d20, receiver=receiver@entry=0x2902440, event=event@entry=0x7fff9eebbbe0) at kernel/qcoreapplication.cpp:1072
#14 0x00007f122792703c in QApplicationPrivate::notify_helper (this=this@entry=0x2619d20, receiver=receiver@entry=0x2902440, e=e@entry=0x7fff9eebbbe0) at kernel/qapplication.cpp:3712
#15 0x00007f122792c516 in QApplication::notify (this=0x7fff9eebd000, receiver=0x2902440, e=0x7fff9eebbbe0) at kernel/qapplication.cpp:3499
#16 0x00007f1226de162b in QCoreApplication::notifyInternal (this=0x7fff9eebd000, receiver=receiver@entry=0x2902440, event=event@entry=0x7fff9eebbbe0) at kernel/qcoreapplication.cpp:965
#17 0x00007f1227962a01 in QCoreApplication::sendEvent (event=0x7fff9eebbbe0, receiver=0x2902440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#18 QWidgetPrivate::sendPendingMoveAndResizeEvents (this=this@entry=0x2930340, recursive=recursive@entry=false, disableUpdates=<optimized out>, disableUpdates@entry=false) at kernel/qwidget.cpp:7712
#19 0x00007f12279667f3 in QWidgetPrivate::show_helper (this=this@entry=0x2930340) at kernel/qwidget.cpp:7763
#20 0x00007f12279695fd in QWidget::setVisible (this=0x2902440, visible=<optimized out>) at kernel/qwidget.cpp:8108
#21 0x00007f1227966788 in QWidgetPrivate::showChildren (this=this@entry=0x2731ed0, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:8191
#22 0x00007f122796680f in QWidgetPrivate::show_helper (this=this@entry=0x2731ed0) at kernel/qwidget.cpp:7769
#23 0x00007f12279695fd in QWidget::setVisible (this=0x29260c0, visible=<optimized out>) at kernel/qwidget.cpp:8108
#24 0x00007f1227966788 in QWidgetPrivate::showChildren (this=this@entry=0x2731b10, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:8191
#25 0x00007f122796680f in QWidgetPrivate::show_helper (this=this@entry=0x2731b10) at kernel/qwidget.cpp:7769
#26 0x00007f12279695fd in QWidget::setVisible (this=0x2721d80, visible=<optimized out>) at kernel/qwidget.cpp:8108
#27 0x00007f12252e9f74 in KPIM::ProgressDialog::setVisible(bool) () from /usr/lib/x86_64-linux-gnu/libKF5Libkdepim.so.5
#28 0x00007f12252eb491 in KPIM::StatusbarProgressWidget::slotProgressButtonClicked() () from /usr/lib/x86_64-linux-gnu/libKF5Libkdepim.so.5
#29 0x00007f1226e0fe4f in QtPrivate::QSlotObjectBase::call (a=0x7fff9eebc100, r=0x293ab80, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#30 QMetaObject::activate (sender=sender@entry=0x293a440, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff9eebc100) at kernel/qobject.cpp:3698
#31 0x00007f1226e107d7 in QMetaObject::activate (sender=sender@entry=0x293a440, m=m@entry=0x7f1227e48a40 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff9eebc100) at kernel/qobject.cpp:3578
#32 0x00007f1227cc11b2 in QAbstractButton::clicked (this=this@entry=0x293a440, _t1=false) at .moc/moc_qabstractbutton.cpp:303
#33 0x00007f1227a23f04 in QAbstractButtonPrivate::emitClicked (this=0x293b170) at widgets/qabstractbutton.cpp:534
#34 0x00007f1227a25519 in QAbstractButtonPrivate::click (this=0x293b170) at widgets/qabstractbutton.cpp:527
#35 0x00007f1227a25694 in QAbstractButton::mouseReleaseEvent (this=0x293a440, e=0x7fff9eebc5d0) at widgets/qabstractbutton.cpp:1132
#36 0x00007f1227969f88 in QWidget::event (this=0x293a440, event=0x7fff9eebc5d0) at kernel/qwidget.cpp:9044
#37 0x00007f122792705c in QApplicationPrivate::notify_helper (this=this@entry=0x2619d20, receiver=receiver@entry=0x293a440, e=e@entry=0x7fff9eebc5d0) at kernel/qapplication.cpp:3716
#38 0x00007f122792cc19 in QApplication::notify (this=<optimized out>, receiver=0x293a440, e=0x7fff9eebc5d0) at kernel/qapplication.cpp:3276
#39 0x00007f1226de162b in QCoreApplication::notifyInternal (this=0x7fff9eebd000, receiver=receiver@entry=0x293a440, event=event@entry=0x7fff9eebc5d0) at kernel/qcoreapplication.cpp:965
#40 0x00007f122792bb32 in QCoreApplication::sendSpontaneousEvent (event=0x7fff9eebc5d0, receiver=0x293a440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#41 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x293a440, event=event@entry=0x7fff9eebc5d0, alienWidget=alienWidget@entry=0x293a440, nativeWidget=0x288db00, buttonDown=buttonDown@entry=0x7f1227e57b20 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2770
#42 0x00007f122798457b in QWidgetWindow::handleMouseEvent (this=this@entry=0x2b37920, event=event@entry=0x7fff9eebc9e0) at kernel/qwidgetwindow.cpp:555
#43 0x00007f1227986b3b in QWidgetWindow::event (this=0x2b37920, event=0x7fff9eebc9e0) at kernel/qwidgetwindow.cpp:210
#44 0x00007f122792705c in QApplicationPrivate::notify_helper (this=this@entry=0x2619d20, receiver=receiver@entry=0x2b37920, e=e@entry=0x7fff9eebc9e0) at kernel/qapplication.cpp:3716
#45 0x00007f122792c516 in QApplication::notify (this=0x7fff9eebd000, receiver=0x2b37920, e=0x7fff9eebc9e0) at kernel/qapplication.cpp:3499
#46 0x00007f1226de162b in QCoreApplication::notifyInternal (this=0x7fff9eebd000, receiver=receiver@entry=0x2b37920, event=event@entry=0x7fff9eebc9e0) at kernel/qcoreapplication.cpp:965
#47 0x00007f1227123521 in QCoreApplication::sendSpontaneousEvent (event=0x7fff9eebc9e0, receiver=0x2b37920) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#48 QGuiApplicationPrivate::processMouseEvent (e=0x4e41120) at kernel/qguiapplication.cpp:1804
#49 0x00007f12271251e5 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x4e41120) at kernel/qguiapplication.cpp:1596
#50 0x00007f1227108f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#51 0x00007f120ca45070 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#52 0x00007f121fb051a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#53 0x00007f121fb05400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#54 0x00007f121fb054ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#55 0x00007f1226e37a7f in QEventDispatcherGlib::processEvents (this=0x2650640, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#56 0x00007f1226ddedea in QEventLoop::exec (this=this@entry=0x7fff9eebcd60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#57 0x00007f1226de6e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#58 0x0000000000404ae9 in main ()

Reported using DrKonqi