Application: kmail (5.2.3)

Qt Version: 5.7.1
Frameworks Version: 5.28.0
Operating System: Linux 4.9.0-2-amd64 x86_64
Distribution: Debian GNU/Linux 9.0 (stretch)

-- Information about the crash:
Clicking through folders on the left side randomly results in KMail crashes

The crash can be reproduced sometimes.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbbb1154940 (LWP 5025))]

Thread 23 (Thread 0x7fbb839b0700 (LWP 15542)):
#0  0x00007fbbc56640c9 in g_mutex_lock (mutex=mutex@entry=0x7fbb7c0032d0) at ././glib/gthread-posix.c:1336
#1  0x00007fbbc561eaf8 in g_main_context_iteration (context=0x7fbb7c0032d0, may_block=1) at ././glib/gmain.c:3989
#2  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbc75f0424 in start_thread (arg=0x7fbb839b0700) at pthread_create.c:333
#7  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7fbb8b7fe700 (LWP 15540)):
#0  0x00007fbbd094e54d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbbc561e9f6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbb340037e0, timeout=<optimized out>, context=0x7fbb340036d0) at ././glib/gmain.c:4228
#2  0x00007fbbc561e9f6 in g_main_context_iterate (context=context@entry=0x7fbb340036d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb340036d0, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbb8b7fe700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7fbb831af700 (LWP 15538)):
#0  0x00007fbbc561e9aa in g_main_context_iterate (context=context@entry=0x7fbb2c0036d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3933
#1  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb2c0036d0, may_block=1) at ././glib/gmain.c:3990
#2  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbc75f0424 in start_thread (arg=0x7fbb831af700) at pthread_create.c:333
#7  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7fbb829ae700 (LWP 15536)):
#0  0x00007fbbc56640e4 in g_mutex_unlock (mutex=0x7fbb30003530) at ././glib/gthread-posix.c:1348
#1  0x00007fbbc561e9aa in g_main_context_iterate (context=context@entry=0x7fbb30003530, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3931
#2  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb30003530, may_block=1) at ././glib/gmain.c:3990
#3  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbc75f0424 in start_thread (arg=0x7fbb829ae700) at pthread_create.c:333
#8  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7fbb8bfff700 (LWP 15534)):
#0  0x00007fbbc56640c9 in g_mutex_lock (mutex=mutex@entry=0x7fbb840032d0) at ././glib/gthread-posix.c:1336
#1  0x00007fbbc561e24e in g_main_context_check (context=context@entry=0x7fbb840032d0, max_priority=2147483647, fds=fds@entry=0x7fbb840033e0, n_fds=n_fds@entry=1) at ././glib/gmain.c:3688
#2  0x00007fbbc561e994 in g_main_context_iterate (context=context@entry=0x7fbb840032d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb840032d0, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbb8bfff700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7fbb3a7fa700 (LWP 15532)):
#0  0x00007fbbc56640c9 in g_mutex_lock (mutex=mutex@entry=0x7fbb140030d0) at ././glib/gthread-posix.c:1336
#1  0x00007fbbc561d8c0 in g_main_context_acquire (context=0x7fbb140030d0) at ././glib/gmain.c:3264
#2  0x00007fbbc561e8a5 in g_main_context_iterate (context=context@entry=0x7fbb140030d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3879
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb140030d0, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbb3a7fa700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7fbb1379f700 (LWP 6042)):
#0  0x00007fbbd31919c5 in __GI___tls_get_addr (ti=0x7fbbd166f788) at dl-tls.c:834
#1  0x00007fbbd1253c36 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fbbd1478931 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fbbc561e3f9 in g_main_context_check (context=context@entry=0x7fbb080060c0, max_priority=2147483647, fds=fds@entry=0x7fbb080051e0, n_fds=n_fds@entry=1) at ././glib/gmain.c:3762
#4  0x00007fbbc561e994 in g_main_context_iterate (context=context@entry=0x7fbb080060c0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#5  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb080060c0, may_block=1) at ././glib/gmain.c:3990
#6  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fbbc75f0424 in start_thread (arg=0x7fbb1379f700) at pthread_create.c:333
#11 0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7fbb12f9e700 (LWP 5910)):
#0  0x00007fbbc561e1e7 in g_main_context_query (context=context@entry=0x7fbb00004f20, max_priority=2147483647, timeout=timeout@entry=0x7fbb12f9db44, fds=fds@entry=0x7fbb000013e0, n_fds=n_fds@entry=2) at ././glib/gmain.c:3646
#1  0x00007fbbc561e968 in g_main_context_iterate (context=context@entry=0x7fbb00004f20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3911
#2  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb00004f20, may_block=1) at ././glib/gmain.c:3990
#3  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbc75f0424 in start_thread (arg=0x7fbb12f9e700) at pthread_create.c:333
#8  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7fbb38a50700 (LWP 5086)):
#0  0x00007fbbc56640c9 in g_mutex_lock (mutex=mutex@entry=0x7fbb0c000990) at ././glib/gthread-posix.c:1336
#1  0x00007fbbc561e8f0 in g_main_context_iterate (context=context@entry=0x7fbb0c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3896
#2  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb0c000990, may_block=1) at ././glib/gmain.c:3990
#3  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbc75f0424 in start_thread (arg=0x7fbb38a50700) at pthread_create.c:333
#8  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7fbb39bdb700 (LWP 5070)):
#0  0x00007fbbc56640e4 in g_mutex_unlock (mutex=0x7fbb18000990) at ././glib/gthread-posix.c:1348
#1  0x00007fbbc561d92e in g_main_context_acquire (context=0x7fbb18000990) at ././glib/gmain.c:3283
#2  0x00007fbbc561e8a5 in g_main_context_iterate (context=context@entry=0x7fbb18000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3879
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb18000990, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbb39bdb700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7fbb3affb700 (LWP 5055)):
#0  0x00007fbbc75f614f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbbc247d913 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fbbc27a5681 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fbbc75f0424 in start_thread (arg=0x7fbb3affb700) at pthread_create.c:333
#4  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7fbb3b7fc700 (LWP 5054)):
#0  0x00007fbbc75f614f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbbc247d913 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fbbc27a5681 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fbbc75f0424 in start_thread (arg=0x7fbb3b7fc700) at pthread_create.c:333
#4  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7fbb3bffd700 (LWP 5053)):
#0  0x00007fbbc75f614f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbbc247d913 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fbbc27a5681 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fbbc75f0424 in start_thread (arg=0x7fbb3bffd700) at pthread_create.c:333
#4  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7fbb80f66700 (LWP 5052)):
#0  0x00007fbbc75f614f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbbc247c7f1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fbbc27a5681 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fbbc75f0424 in start_thread (arg=0x7fbb80f66700) at pthread_create.c:333
#4  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7fbb8affd700 (LWP 5045)):
#0  0x00007fbbc75f614f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbbc277498b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fbbc27749c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fbbc75f0424 in start_thread (arg=0x7fbb8affd700) at pthread_create.c:333
#4  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7fbba5ffb700 (LWP 5039)):
#0  0x00007fbbc561e5a2 in g_main_context_dispatch (context=context@entry=0x7fbb90000990) at ././glib/gmain.c:3862
#1  0x00007fbbc561ea60 in g_main_context_iterate (context=context@entry=0x7fbb90000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3929
#2  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb90000990, may_block=1) at ././glib/gmain.c:3990
#3  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbc75f0424 in start_thread (arg=0x7fbba5ffb700) at pthread_create.c:333
#8  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7fbba67fc700 (LWP 5037)):
#0  0x00007fbbd1478622 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007fbbc561dedd in g_main_context_prepare (context=context@entry=0x7fbb8c000990, priority=priority@entry=0x7fbba67fbb40) at ././glib/gmain.c:3501
#2  0x00007fbbc561e91b in g_main_context_iterate (context=context@entry=0x7fbb8c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb8c000990, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbba67fc700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fbba6ffd700 (LWP 5035)):
#0  0x00007fbbd094e54d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbbc561e9f6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbb98003020, timeout=<optimized out>, context=0x7fbb98000990) at ././glib/gmain.c:4228
#2  0x00007fbbc561e9f6 in g_main_context_iterate (context=context@entry=0x7fbb98000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb98000990, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbba6ffd700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fbba77fe700 (LWP 5033)):
#0  0x00007fbbc561b992 in g_source_iter_next (iter=iter@entry=0x7fbba77fdac0, source=source@entry=0x7fbba77fdab8) at ././glib/gmain.c:950
#1  0x00007fbbc561e334 in g_main_context_check (context=context@entry=0x7fbb94000990, max_priority=2147483647, fds=fds@entry=0x7fbb94003020, n_fds=n_fds@entry=1) at ././glib/gmain.c:3742
#2  0x00007fbbc561e994 in g_main_context_iterate (context=context@entry=0x7fbb94000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb94000990, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fbbc75f0424 in start_thread (arg=0x7fbba77fe700) at pthread_create.c:333
#9  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fbba7fff700 (LWP 5032)):
#0  0x00007fbbc56640e4 in g_mutex_unlock (mutex=0x7fbb9c000990) at ././glib/gthread-posix.c:1348
#1  0x00007fbbc561e90e in g_main_context_iterate (context=context@entry=0x7fbb9c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3907
#2  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbb9c000990, may_block=1) at ././glib/gmain.c:3990
#3  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbc75f0424 in start_thread (arg=0x7fbba7fff700) at pthread_create.c:333
#8  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fbbad61e700 (LWP 5031)):
#0  0x00007fbbd094e54d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbbc561e9f6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbba0028450, timeout=<optimized out>, context=0x7fbba0000990) at ././glib/gmain.c:4228
#2  0x00007fbbc561e9f6 in g_main_context_iterate (context=context@entry=0x7fbba0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbba0000990, may_block=1) at ././glib/gmain.c:3990
#4  0x00007fbbd147906b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fbbd12500f3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fbbd32e96d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fbbc75f0424 in start_thread (arg=0x7fbbad61e700) at pthread_create.c:333
#10 0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fbbaee17700 (LWP 5030)):
#0  0x00007fbbd094e54d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbbc44f4150 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fbbc44f5ee9 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fbbb0b3cb69 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fbbd1254da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fbbc75f0424 in start_thread (arg=0x7fbbaee17700) at pthread_create.c:333
#6  0x00007fbbd09579bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fbbb1154940 (LWP 5025)):
[KCrash Handler]
#6  0x00007fbbcd336285 in KStatusNotifierItem::setStatus(KStatusNotifierItem::ItemStatus) () at /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#7  0x00007fbbd2b7907c in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#8  0x00007fbbd2b82f23 in KMKernel::toggleSystemTray() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#9  0x00007fbbd2bc07eb in KMMainWidget::readConfig() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#10 0x00007fbbd2bc0ed1 in KMMainWidget::KMMainWidget(QWidget*, KXMLGUIClient*, KActionCollection*, QExplicitlySharedDataPointer<KSharedConfig>) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#11 0x00007fbbd2b6e55a in KMMainWin::KMMainWin(QWidget*) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#12 0x00007fbbd2b7f1ed in KMKernel::openReader(bool) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#13 0x00007fbbd2b88ca4 in KMKernel::action(bool, bool, QString const&, QString const&, QString const&, QString const&, QString const&, QUrl const&, QList<QUrl> const&, QStringList const&, QString const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#14 0x00007fbbd2b8a14d in KMKernel::handleCommandLine(bool, QStringList const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#15 0x000056420a9a6571 in  ()
#16 0x00007fbbd2f7814e in KontactInterface::PimUniqueApplication::newInstance(QByteArray const&, QStringList const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#17 0x00007fbbd2f791d2 in  () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#18 0x00007fbbd2f79533 in KontactInterface::PimUniqueApplication::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#19 0x00007fbbd32f5a10 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#20 0x00007fbbd32f983d in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#21 0x00007fbbd32f9e1c in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#22 0x00007fbbd32fc8ee in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#23 0x00007fbbd1451499 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fbbd1768d54 in QGuiApplication::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#25 0x00007fbbd21f392f in QApplication::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007fbbd21edb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007fbbd21f5341 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007fbbd14249e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fbbd142716d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007fbbd1478c43 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007fbbc561e7f7 in g_main_dispatch (context=0x7fbba80016f0) at ././glib/gmain.c:3203
#32 0x00007fbbc561e7f7 in g_main_context_dispatch (context=context@entry=0x7fbba80016f0) at ././glib/gmain.c:3856
#33 0x00007fbbc561ea60 in g_main_context_iterate (context=context@entry=0x7fbba80016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3929
#34 0x00007fbbc561eb0c in g_main_context_iteration (context=0x7fbba80016f0, may_block=1) at ././glib/gmain.c:3990
#35 0x00007fbbd147904f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fbbd14229ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fbbd142b13c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x000056420a9a5a4c in  ()
#39 0x00007fbbd088f2b1 in __libc_start_main (main=0x56420a9a49a0, argc=3, argv=0x7ffcda824228, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcda824218) at ../csu/libc-start.c:291
#40 0x000056420a9a613a in _start ()

Reported using DrKonqi