Application: kmail (5.4.2)

Qt Version: 5.8.0
Frameworks Version: 5.30.0
Operating System: Linux 4.9.9-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
Several times I close KMail, the program crashed. This bug happend after the upgrade to KDE Plasma 5.9.1.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4716e47900 (LWP 1392))]

Thread 8 (Thread 0x7f45b66fb700 (LWP 1598)):
#0  0x00007f4703d1d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f46fe8c7563 in  () at /usr/lib/libQt5WebKit.so.5
#2  0x00007f46febff781 in  () at /usr/lib/libQt5WebKit.so.5
#3  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f45b6efc700 (LWP 1597)):
#0  0x00007f4703d1d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f46fe8c6411 in  () at /usr/lib/libQt5WebKit.so.5
#2  0x00007f46febff781 in  () at /usr/lib/libQt5WebKit.so.5
#3  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f45f7e1d700 (LWP 1596)):
#0  0x00007f4703d1d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f46febce60b in  () at /usr/lib/libQt5WebKit.so.5
#2  0x00007f46febce649 in  () at /usr/lib/libQt5WebKit.so.5
#3  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f4678fb4700 (LWP 1595)):
#0  0x00007f4703d1d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f46f24b2234 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f46f24b2279 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f46bb7fe700 (LWP 1437)):
#0  0x00007f4703d1d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4707d03285 in  () at /usr/lib/libQt5WebEngineCore.so.5
#2  0x00007f4707d03344 in  () at /usr/lib/libQt5WebEngineCore.so.5
#3  0x00007f4707ce0453 in  () at /usr/lib/libQt5WebEngineCore.so.5
#4  0x00007f4707cf65c4 in  () at /usr/lib/libQt5WebEngineCore.so.5
#5  0x00007f4707d0eae5 in  () at /usr/lib/libQt5WebEngineCore.so.5
#6  0x00007f4707d0ee04 in  () at /usr/lib/libQt5WebEngineCore.so.5
#7  0x00007f4707d0b342 in  () at /usr/lib/libQt5WebEngineCore.so.5
#8  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f46d897a700 (LWP 1395)):
#0  0x00007f4702013db9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4701fce680 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4701fce89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f471483c06b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f47147e589a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4714607a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f4712c37125 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f471460c6d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f46e1d5b700 (LWP 1394)):
#0  0x00007f4713d0148d in poll () at /usr/lib/libc.so.6
#1  0x00007f47013d28e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f47013d4679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f46e3c49239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f471460c6d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f4703d17454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f4713d0a7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f4716e47900 (LWP 1392)):
[KCrash Handler]
#6  0x00007f46da6eacf8 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#7  0x00007f46da7a07bc in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#8  0x00007f46da6ec58b in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#9  0x00007f46da76d752 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#10 0x00007f46da76d990 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#11 0x00007f46d9a3b403 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#12 0x00007f46d9b73222 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#13 0x00007f46da8dd332 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#14 0x00007f46da8dcdfd in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#15 0x00007f46da8e52df in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#16 0x00007f46db7cb354 in  () at /usr/lib/xorg/modules/dri//fglrx_dri.so
#17 0x00007f4703853162 in  () at /usr/lib/libGL.so.1
#18 0x00007f470385336c in glXDestroyContext () at /usr/lib/libGL.so.1
#19 0x00007f46e1354431 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#20 0x00007f46e1354459 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#21 0x00007f4714d7100b in QOpenGLContext::destroy() () at /usr/lib/libQt5Gui.so.5
#22 0x00007f4714d71337 in QOpenGLContext::~QOpenGLContext() () at /usr/lib/libQt5Gui.so.5
#23 0x00007f4714d71349 in QOpenGLContext::~QOpenGLContext() () at /usr/lib/libQt5Gui.so.5
#24 0x00007f4709cef6c6 in  () at /usr/lib/libQt5WebEngineCore.so.5
#25 0x00007f47147e69bf in qt_call_post_routines() () at /usr/lib/libQt5Core.so.5
#26 0x00007f47154c9a46 in QApplication::~QApplication() () at /usr/lib/libQt5Widgets.so.5
#27 0x00000000004039f7 in  ()
#28 0x00007f4713c42291 in __libc_start_main () at /usr/lib/libc.so.6
#29 0x000000000040424a in _start ()

Reported using DrKonqi