Application: kmail (5.2.3)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.9.0-ck1+ x86_64
Distribution: Ubuntu 16.10

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

I was having imap unhappiness on upgrading my imap server and after configuring it and downloading the latest messages since I could not find the trash folder to set the wastebin folder in advanced, I shut down kmail in the hope the folders would appear and then restarted kmail. When I restarted it it crashed, but on startup nothing is still showing up in the search for a suitable folder as the wastebin.

-- 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 0x7fec55b3d940 (LWP 30236))]

Thread 26 (Thread 0x7fec24b43700 (LWP 32494)):
#0  0x00007fec6b245044 in g_mutex_unlock (mutex=0x7fec200020d0) at ././glib/gthread-posix.c:1348
#1  0x00007fec6b1fefb0 in g_main_context_prepare (context=context@entry=0x7fec200020d0, priority=priority@entry=0x7fec24b42b40) at ././glib/gmain.c:3569
#2  0x00007fec6b1ff8fb in g_main_context_iterate (context=context@entry=0x7fec200020d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec200020d0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec20002000, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec24b42c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f8680d140) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7fec24b43700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 25 (Thread 0x7fec2de0d700 (LWP 32492)):
#0  0x00007fec6b1ffac0 in g_main_context_iteration (context=0x7febd80030b0, may_block=may_block@entry=1) at ././glib/gmain.c:3983
#1  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7febd8003650, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#2  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec2de0cc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#3  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#4  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f867e2de0) at thread/qthread_unix.cpp:341
#5  0x00007fec6b7236ca in start_thread (arg=0x7fec2de0d700) at pthread_create.c:333
#6  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 24 (Thread 0x7febdfffd700 (LWP 32490)):
#0  0x00007fec74a1ec8d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b243c80 in read (__nbytes=16, __buf=0x7febdfffca60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007fec6b243c80 in g_wakeup_acknowledge (wakeup=0x7fec340027a0) at ././glib/gwakeup.c:210
#3  0x00007fec6b1ff485 in g_main_context_check (context=context@entry=0x7febd0003ea0, max_priority=2147483647, fds=fds@entry=0x7febd0003070, n_fds=n_fds@entry=1) at ././glib/gmain.c:3707
#4  0x00007fec6b1ff974 in g_main_context_iterate (context=context@entry=0x7febd0003ea0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#5  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7febd0003ea0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#6  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7febd0003450, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#7  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7febdfffcc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#9  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f8477cdf0) at thread/qthread_unix.cpp:341
#10 0x00007fec6b7236ca in start_thread (arg=0x7febdfffd700) at pthread_create.c:333
#11 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 23 (Thread 0x7febdf7fc700 (LWP 32488)):
#0  0x00007fec74a230bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b1ff9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7febd40012c0, timeout=<optimized out>, context=0x7febd40035d0) at ././glib/gmain.c:4228
#2  0x00007fec6b1ff9d6 in g_main_context_iterate (context=context@entry=0x7febd40035d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7febd40035d0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7febd4003830, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7febdf7fbc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f844f1400) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7febdf7fc700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7fec2e60e700 (LWP 32486)):
#0  0x00007fec74a1ec8d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b243c80 in read (__nbytes=16, __buf=0x7fec2e60da60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007fec6b243c80 in g_wakeup_acknowledge (wakeup=0x7feba8001e50) at ././glib/gwakeup.c:210
#3  0x00007fec6b1ff485 in g_main_context_check (context=context@entry=0x7fec28003ca0, max_priority=2147483647, fds=fds@entry=0x7fec28002e70, n_fds=n_fds@entry=1) at ././glib/gmain.c:3707
#4  0x00007fec6b1ff974 in g_main_context_iterate (context=context@entry=0x7fec28003ca0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#5  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec28003ca0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#6  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec28003250, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#7  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec2e60dc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#9  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f84399d00) at thread/qthread_unix.cpp:341
#10 0x00007fec6b7236ca in start_thread (arg=0x7fec2e60e700) at pthread_create.c:333
#11 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7febcdffb700 (LWP 32484)):
#0  0x00007fec74a1ec8d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b243c80 in read (__nbytes=16, __buf=0x7febcdffaa60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007fec6b243c80 in g_wakeup_acknowledge (wakeup=0x7feba8001e00) at ././glib/gwakeup.c:210
#3  0x00007fec6b1ff485 in g_main_context_check (context=context@entry=0x7feba80038a0, max_priority=2147483647, fds=fds@entry=0x7feba8002a70, n_fds=n_fds@entry=1) at ././glib/gmain.c:3707
#4  0x00007fec6b1ff974 in g_main_context_iterate (context=context@entry=0x7feba80038a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#5  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7feba80038a0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#6  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7feba8002e50, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#7  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7febcdffac80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#9  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f851d30b0) at thread/qthread_unix.cpp:341
#10 0x00007fec6b7236ca in start_thread (arg=0x7febcdffb700) at pthread_create.c:333
#11 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7feba495f700 (LWP 30323)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6befe574 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fec6befe5b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7feba495f700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7feba6903700 (LWP 30288)):
#0  0x00007fec74a1ec8d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b243c80 in read (__nbytes=16, __buf=0x7feba6902a60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007fec6b243c80 in g_wakeup_acknowledge (wakeup=0x7feba00027a0) at ././glib/gwakeup.c:210
#3  0x00007fec6b1ff485 in g_main_context_check (context=context@entry=0x7feb98000990, max_priority=2147483647, fds=fds@entry=0x7feb98002c20, n_fds=n_fds@entry=1) at ././glib/gmain.c:3707
#4  0x00007fec6b1ff974 in g_main_context_iterate (context=context@entry=0x7feb98000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#5  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7feb98000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#6  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7feb980008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#7  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7feba6902c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#9  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f84a03cb0) at thread/qthread_unix.cpp:341
#10 0x00007fec6b7236ca in start_thread (arg=0x7feba6903700) at pthread_create.c:333
#11 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7feba7104700 (LWP 30285)):
#0  0x00007fec7556657e in QTimerInfoList::repairTimersIfNeeded() (this=0x7feba00030d0) at kernel/qtimerinfo_unix.cpp:155
#1  0x00007fec755665f3 in QTimerInfoList::timerWait(timespec&) (this=0x7feba00030d0, tm=...) at kernel/qtimerinfo_unix.cpp:382
#2  0x00007fec7556799e in timerSourcePrepareHelper (timeout=0x7feba7103ab4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:126
#3  0x00007fec7556799e in timerSourcePrepare(GSource*, gint*) (source=<optimized out>, timeout=timeout@entry=0x7feba7103ab4) at kernel/qeventdispatcher_glib.cpp:159
#4  0x00007fec6b1feed9 in g_main_context_prepare (context=context@entry=0x7feba0000990, priority=priority@entry=0x7feba7103b40) at ././glib/gmain.c:3501
#5  0x00007fec6b1ff8fb in g_main_context_iterate (context=context@entry=0x7feba0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#6  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7feba0000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#7  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7feba00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#8  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7feba7103c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#9  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#10 0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f849a5c00) at thread/qthread_unix.cpp:341
#11 0x00007fec6b7236ca in start_thread (arg=0x7feba7104700) at pthread_create.c:333
#12 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7febcd1d3700 (LWP 30279)):
#0  0x00007fec74a230bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b1ff9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7febac003220, timeout=<optimized out>, context=0x7febac000990) at ././glib/gmain.c:4228
#2  0x00007fec6b1ff9d6 in g_main_context_iterate (context=context@entry=0x7febac000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7febac000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7febac0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7febcd1d2c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f84a78a80) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7febcd1d3700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7febce7fc700 (LWP 30265)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febce7fc700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7febceffd700 (LWP 30264)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febceffd700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7febcf7fe700 (LWP 30263)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febcf7fe700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7febcffff700 (LWP 30262)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febcffff700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7febdcf6e700 (LWP 30261)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febdcf6e700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7febdd76f700 (LWP 30260)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658dda3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febdd76f700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7febddf70700 (LWP 30259)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6658cd74 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec668ae591 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7febddf70700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7fec2d60c700 (LWP 30252)):
#0  0x00007fec6b7294d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fec6687e96b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fec6687e9a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fec6b7236ca in start_thread (arg=0x7fec2d60c700) at pthread_create.c:333
#4  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7fec49ffb700 (LWP 30246)):
#0  0x00007fec74a230bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b1ff9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fec34003220, timeout=<optimized out>, context=0x7fec34000990) at ././glib/gmain.c:4228
#2  0x00007fec6b1ff9d6 in g_main_context_iterate (context=context@entry=0x7fec34000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec34000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec340008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec49ffac80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f8435aaf0) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7fec49ffb700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7fec4a7fc700 (LWP 30244)):
#0  0x00007fec75567936 in timerSourcePrepare(GSource*, gint*) (source=0x7fec30002c70, timeout=timeout@entry=0x7fec4a7fbab4) at kernel/qeventdispatcher_glib.cpp:147
#1  0x00007fec6b1feed9 in g_main_context_prepare (context=context@entry=0x7fec30000990, priority=priority@entry=0x7fec4a7fbb40) at ././glib/gmain.c:3501
#2  0x00007fec6b1ff8fb in g_main_context_iterate (context=context@entry=0x7fec30000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec30000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec300008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec4a7fbc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f842f2d40) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7fec4a7fc700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fec4affd700 (LWP 30242)):
#0  0x00007fec74a230bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec6b1ff9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fec3c003020, timeout=<optimized out>, context=0x7fec3c000990) at ././glib/gmain.c:4228
#2  0x00007fec6b1ff9d6 in g_main_context_iterate (context=context@entry=0x7fec3c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec3c000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec3c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec4affcc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f842fec80) at thread/qthread_unix.cpp:341
#8  0x00007fec6b7236ca in start_thread (arg=0x7fec4affd700) at pthread_create.c:333
#9  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fec4b7fe700 (LWP 30240)):
#0  0x00007fec6b1feebb in g_main_context_prepare (context=context@entry=0x7fec38000990, priority=priority@entry=0x7fec4b7fdb40) at ././glib/gmain.c:3496
#1  0x00007fec6b1ff8fb in g_main_context_iterate (context=context@entry=0x7fec38000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#2  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec38000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#3  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec380008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec4b7fdc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#6  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f843930d0) at thread/qthread_unix.cpp:341
#7  0x00007fec6b7236ca in start_thread (arg=0x7fec4b7fe700) at pthread_create.c:333
#8  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fec4bfff700 (LWP 30239)):
#0  0x00007fec6b1ff950 in g_main_context_iterate (context=context@entry=0x7fec40000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3921
#1  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec40000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#2  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec400008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#3  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec4bffec80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007fec75335d43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#5  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f842fc6f0) at thread/qthread_unix.cpp:341
#6  0x00007fec6b7236ca in start_thread (arg=0x7fec4bfff700) at pthread_create.c:333
#7  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fec51a27700 (LWP 30238)):
#0  0x00007fec772eedc0 in __GI___tls_get_addr (ti=0x7fec7575f798) at dl-tls.c:831
#1  0x00007fec75339b06 in get_thread_data () at thread/qthread_unix.cpp:184
#2  0x00007fec75339b06 in QThreadData::current(bool) (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:215
#3  0x00007fec75567c91 in postEventSourcePrepare (timeout=0x0, s=0x7fec440012d0) at kernel/qeventdispatcher_glib.cpp:246
#4  0x00007fec75567c91 in postEventSourceCheck(GSource*) (source=0x7fec440012d0) at kernel/qeventdispatcher_glib.cpp:263
#5  0x00007fec6b1ff3c9 in g_main_context_check (context=context@entry=0x7fec44000990, max_priority=2147483647, fds=fds@entry=0x7fec44023680, n_fds=n_fds@entry=1) at ././glib/gmain.c:3762
#6  0x00007fec6b1ff974 in g_main_context_iterate (context=context@entry=0x7fec44000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3926
#7  0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec44000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#8  0x00007fec755684ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fec440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#9  0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fec51a26c50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#10 0x00007fec75335d43 in QThread::exec() (this=this@entry=0x7fec774bed60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:500
#11 0x00007fec7744a575 in QDBusConnectionManager::run() (this=0x7fec774bed60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:171
#12 0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x7fec774bed60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:341
#13 0x00007fec6b7236ca in start_thread (arg=0x7fec51a27700) at pthread_create.c:333
#14 0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fec53353700 (LWP 30237)):
#0  0x00007fec74a230bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fec685ebc62 in poll (__timeout=-1, __nfds=1, __fds=0x7fec53352b80) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007fec685ebc62 in _xcb_conn_wait (c=c@entry=0x560f8423bbf0, cond=cond@entry=0x560f8423bc30, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007fec685ed8d7 in xcb_wait_for_event (c=0x560f8423bbf0) at ../../src/xcb_in.c:693
#4  0x00007fec558b6299 in QXcbEventReader::run() (this=0x560f84249d90) at qxcbconnection.cpp:1325
#5  0x00007fec7533ac68 in QThreadPrivate::start(void*) (arg=0x560f84249d90) at thread/qthread_unix.cpp:341
#6  0x00007fec6b7236ca in start_thread (arg=0x7fec53353700) at pthread_create.c:333
#7  0x00007fec74a2f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fec55b3d940 (LWP 30236)):
[KCrash Handler]
#6  0x00007fec753c9780 in operator==(QString const&, QString const&) (s1=..., s2=...) at tools/qstring.cpp:2686
#7  0x00007fec71416cec in KStatusNotifierItem::setToolTipSubTitle(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#8  0x00007fec76cd3980 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#9  0x00007fec76cd37a4 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#10 0x00007fec76cd3ba6 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#11 0x00007fec76cdcc4d in KMKernel::toggleSystemTray() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#12 0x00007fec76d1ae0b in KMMainWidget::readConfig() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#13 0x00007fec76d1b4f1 in KMMainWidget::KMMainWidget(QWidget*, KXMLGUIClient*, KActionCollection*, QExplicitlySharedDataPointer<KSharedConfig>) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#14 0x00007fec76cc810a in KMMainWin::KMMainWin(QWidget*) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#15 0x00007fec76cd8ead in KMKernel::openReader(bool) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#16 0x00007fec76ce2ab4 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
#17 0x00007fec76ce3fed in KMKernel::handleCommandLine(bool, QStringList const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#18 0x0000560f83c503d1 in  ()
#19 0x00007fec770d407e in KontactInterface::PimUniqueApplication::newInstance(QByteArray const&, QStringList const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#20 0x00007fec770d50d2 in  () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#21 0x00007fec770d5483 in KontactInterface::PimUniqueApplication::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#22 0x00007fec77456118 in QDBusConnectionPrivate::deliverCall(QObject*, int, QDBusMessage const&, QVector<int> const&, int) (this=this@entry=0x7fec440030f0, object=object@entry=0x7ffc0a40d850, msg=..., metaTypes=..., slotIdx=<optimized out>) at qdbusintegrator.cpp:993
#23 0x00007fec7745a05d in QDBusConnectionPrivate::activateCall(QObject*, int, QDBusMessage const&) (this=this@entry=0x7fec440030f0, object=0x7ffc0a40d850, flags=81, msg=...) at qdbusintegrator.cpp:896
#24 0x00007fec7745a66c in QDBusConnectionPrivate::activateObject(QDBusConnectionPrivate::ObjectTreeNode&, QDBusMessage const&, int) (this=0x7fec440030f0, node=..., msg=..., pathStartPos=<optimized out>) at qdbusintegrator.cpp:1509
#25 0x00007fec7745d15e in QDBusActivateObjectEvent::placeMetaCall(QObject*) (this=0x7fec44007840) at qdbusintegrator.cpp:1605
#26 0x00007fec75540699 in QObject::event(QEvent*) (this=this@entry=0x7ffc0a40d850, e=e@entry=0x7fec44007840) at kernel/qobject.cpp:1256
#27 0x00007fec7551884c in QCoreApplication::event(QEvent*) (this=this@entry=0x7ffc0a40d850, e=e@entry=0x7fec44007840) at kernel/qcoreapplication.cpp:1785
#28 0x00007fec75861884 in QGuiApplication::event(QEvent*) (this=this@entry=0x7ffc0a40d850, e=e@entry=0x7fec44007840) at kernel/qguiapplication.cpp:1621
#29 0x00007fec7633420f in QApplication::event(QEvent*) (this=0x7ffc0a40d850, e=0x7fec44007840) at kernel/qapplication.cpp:2075
#30 0x00007fec763308ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x7ffc0a40d850, e=0x7fec44007840) at kernel/qapplication.cpp:3804
#31 0x00007fec76335d4f in QApplication::notify(QObject*, QEvent*) (this=0x7ffc0a40d850, receiver=0x7ffc0a40d850, e=0x7fec44007840) at kernel/qapplication.cpp:3561
#32 0x00007fec755123b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x7ffc0a40d850, event=event@entry=0x7fec44007840) at kernel/qcoreapplication.cpp:1015
#33 0x00007fec7551433c in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x7fec44007840, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#34 0x00007fec7551433c in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x560f842254f0) at kernel/qcoreapplication.cpp:1650
#35 0x00007fec755147f8 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1508
#36 0x00007fec75568083 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x560f84272ad0) at kernel/qeventdispatcher_glib.cpp:270
#37 0x00007fec6b1ff7d7 in g_main_dispatch (context=0x7fec4c0016f0) at ././glib/gmain.c:3203
#38 0x00007fec6b1ff7d7 in g_main_context_dispatch (context=context@entry=0x7fec4c0016f0) at ././glib/gmain.c:3856
#39 0x00007fec6b1ffa40 in g_main_context_iterate (context=context@entry=0x7fec4c0016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3929
#40 0x00007fec6b1ffaec in g_main_context_iteration (context=0x7fec4c0016f0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#41 0x00007fec7556848f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x560f84272780, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#42 0x00007fec755100fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffc0a40d1e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#43 0x00007fec7551890c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1285
#44 0x0000560f83c4f8af in  ()
#45 0x00007fec749473f1 in __libc_start_main (main=0x560f83c4e7e0, argc=3, argv=0x7ffc0a40da88, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc0a40da78) at ../csu/libc-start.c:291
#46 0x0000560f83c4ff9a in _start ()

Reported using DrKonqi