Application: kmail (5.1.1)
 (Compiled from sources)
Qt Version: 5.5.1
Operating System: Linux 4.3.3-gentoo x86_64
Distribution: "Gentoo Base System release 2.2"

-- Information about the crash:
- What I was doing when the application crashed:
I had a half written mail, started  writing in the "TO" field. Autocompletion popped up.
I continued writing the name, KMail crashed.
Happened twice, haven't tried more times.

Special setup:
Akonadi using postgresql.

The crash can be reproduced every time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f10e4958840 (LWP 2222))]

Thread 20 (Thread 0x7f10d82ad700 (LWP 2224)):
#0  pthread_cond_wait () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f10e17b6513 in cnd_wait (mtx=0x1b8e568, cond=<optimized out>) at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/include/c11/threads_posix.h:159
#2  pipe_semaphore_wait (sema=0x1b8e568) at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/gallium/auxiliary/os/os_thread.h:259
#3  radeon_drm_cs_emit_ioctl (param=param@entry=0x1b8e140) at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/gallium/winsys/radeon/drm/radeon_drm_winsys.c:659
#4  0x00007f10e17b5d37 in impl_thrd_routine (p=<optimized out>) at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/include/c11/threads_posix.h:87
#5  0x00007f10fa2e3314 in start_thread (arg=0x7f10d82ad700) at pthread_create.c:333
#6  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 19 (Thread 0x7f10d65e7700 (LWP 2225)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f10d0003070, timeout=9990, context=0x7f10d0000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10d0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10d0000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10d00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10d65e6d90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c35470) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10d65e7700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7f10d5dcd700 (LWP 2226)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10c8002e20, timeout=-1, context=0x7f10c8000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10c8000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10c8000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10c80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10d5dccd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c6da60) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10d5dcd700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7f10d55cc700 (LWP 2227)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10cc003020, timeout=-1, context=0x7f10cc000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10cc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10cc000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10cc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10d55cbd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c82610) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10d55cc700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7f10d4dcb700 (LWP 2230)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10c0003020, timeout=-1, context=0x7f10c0000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10c0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10c0000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10c00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10d4dcad90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c98550) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10d4dcb700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7f10c7fff700 (LWP 2232)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10bc002e20, timeout=-1, context=0x7f10bc000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10bc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10bc000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10bc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10c7ffed90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c959c0) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10c7fff700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7f10c70dd700 (LWP 2234)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10b4003220, timeout=-1, context=0x7f10b4000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10b4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10b4000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10b40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10c70dcd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x1c60eb0) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10c70dd700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7f10ba268700 (LWP 2246)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10b0002e20, timeout=-1, context=0x7f10b0000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10b0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10b0000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10b00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10ba267d90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x268c840) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10ba268700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7f10b9a67700 (LWP 2248)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10a8002e20, timeout=-1, context=0x7f10a8000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10a8000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10a8000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10a80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10b9a66d90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x26c88c0) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10b9a67700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f10b9266700 (LWP 2250)):
#0  pthread_cond_wait () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f10f5b83ce3 in WTF::TCMalloc_PageHeap::scavengerThread (this=<optimized out>) at wtf/FastMalloc.cpp:2821
#2  0x00007f10f5b83d09 in WTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at wtf/FastMalloc.cpp:1989
#3  0x00007f10fa2e3314 in start_thread (arg=0x7f10b9266700) at pthread_create.c:333
#4  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f10affff700 (LWP 2251)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f1060003220, timeout=-1, context=0x7f1060000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f1060000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f1060000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10600008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10afffed90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x26c8e70) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10affff700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f10af7fe700 (LWP 2253)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f1058003020, timeout=-1, context=0x7f1058000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f1058000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f1058000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10af7fdd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x27cfd40) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10af7fe700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f10aeffd700 (LWP 2255)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f105c004390, timeout=-1, context=0x7f105c000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f105c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f105c000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f105c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10aeffcd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x27de880) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10aeffd700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f10ad67b700 (LWP 2257)):
#0  pthread_cond_wait () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f10f589217d in JSC::BlockAllocator::blockFreeingThreadMain (this=0x7f10b89c2058) at heap/BlockAllocator.cpp:139
#2  0x00007f10f5bb2241 in WTF::wtfThreadEntryPoint (param=0x7f10b896b1b0) at wtf/ThreadingPthreads.cpp:195
#3  0x00007f10fa2e3314 in start_thread (arg=0x7f10ad67b700) at pthread_create.c:333
#4  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f10ace7a700 (LWP 2258)):
#0  pthread_cond_wait () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f10f5893153 in JSC::GCThread::waitForNextPhase (this=0x28a4250) at heap/GCThread.cpp:81
#2  JSC::GCThread::gcThreadMain (this=0x28a4250) at heap/GCThread.cpp:99
#3  0x00007f10f5bb2241 in WTF::wtfThreadEntryPoint (param=0x7f10b896b140) at wtf/ThreadingPthreads.cpp:195
#4  0x00007f10fa2e3314 in start_thread (arg=0x7f10ace7a700) at pthread_create.c:333
#5  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f1067ffd700 (LWP 2259)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f1048002a20, timeout=-1, context=0x7f1048000990) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f1048000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f1048000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f10480008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f1067ffcd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x29b2300) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f1067ffd700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f10671cd700 (LWP 2273)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x2c094d0, timeout=-1, context=0x2c07480) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x2c07480, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x2c07480, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x2242620, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f10671ccd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x2c072b0) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f10671cd700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f1065d3e700 (LWP 2277)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f1048002fe0, timeout=-1, context=0x7f1048003d10) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f1048003d10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f1048003d10, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f1048007c70, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f1065d3dd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0xca569c0) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f1065d3e700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f106553d700 (LWP 2280)):
#0  0x00007f110324fc4d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f10f87e7b74 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f10540013e0, timeout=-1, context=0x7f10540009d0) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f10540009d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10540009d0, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x7f1054000900, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7f106553cd90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1103aca51a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1103aceb63 in QThreadPrivate::start (arg=0x2b50770) at thread/qthread_unix.cpp:331
#8  0x00007f10fa2e3314 in start_thread (arg=0x7f106553d700) at pthread_create.c:333
#9  0x00007f110325883d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f10e4958840 (LWP 2222)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007f10ed3c18e6 in LocalSubMatch::open_post_list (this=0xb6d6430, term="t", wqf=1, factor=1, need_positions=<optimized out>, hint=0x7ffd5456d5d0, lazy_weight=<optimized out>) at matcher/localsubmatch.cc:278
#8  0x00007f10ed2dbdc1 in Xapian::Query::Internal::postlist_sub_or_like (this=<optimized out>, ctx=..., qopt=<optimized out>, factor=<optimized out>) at api/queryinternal.cc:576
#9  0x00007f10ed2dd0b3 in Xapian::Internal::QueryBranch::do_or_like (this=0xc8d1e80, ctx=..., qopt=0x7ffd5456d5c0, factor=1, elite_set_size=0, first=<optimized out>) at api/queryinternal.cc:1104
#10 0x00007f10ed2dd0b3 in Xapian::Internal::QueryBranch::do_or_like (this=this@entry=0xa9f5d90, ctx=..., qopt=qopt@entry=0x7ffd5456d5c0, factor=factor@entry=1, elite_set_size=elite_set_size@entry=0, first=first@entry=0) at api/queryinternal.cc:1104
#11 0x00007f10ed2dd3a0 in Xapian::Internal::QueryOr::postlist (this=0xa9f5d90, qopt=0x7ffd5456d5c0, factor=1) at api/queryinternal.cc:1418
#12 0x00007f10ed3c0c15 in LocalSubMatch::get_postlist (this=0xb6d6430, matcher=0x7ffd5456dba0, total_subqs_ptr=0x7ffd5456d71c) at matcher/localsubmatch.cc:202
#13 0x00007f10ed3c5b81 in MultiMatch::get_mset (this=this@entry=0x7ffd5456dba0, first=first@entry=0, maxitems=20, check_at_least=check_at_least@entry=20, mset=..., stats=..., mdecider=mdecider@entry=0x0, sorter=0x0) at matcher/multimatch.cc:438
#14 0x00007f10ed2ceb19 in Xapian::Enquire::Internal::get_mset (this=0xc56ae60, first=<optimized out>, first@entry=0, maxitems=<optimized out>, check_at_least=<optimized out>, check_at_least@entry=0, rset=rset@entry=0x0, mdecider=mdecider@entry=0x0) at api/omenquire.cc:703
#15 0x00007f10ed2cee5d in Xapian::Enquire::get_mset (this=this@entry=0x7ffd5456de00, first=first@entry=0, maxitems=<optimized out>, check_at_least=check_at_least@entry=0, rset=rset@entry=0x0, mdecider=mdecider@entry=0x0) at api/omenquire.cc:1067
#16 0x00007f10f727572b in Akonadi::Search::PIM::ContactCompleter::complete (this=this@entry=0x7ffd5456df20) at /var/tmp/portage/kde-apps/akonadi-search-15.12.1/work/akonadi-search-15.12.1/lib/contactcompleter.cpp:71
#17 0x00007f10fec523e5 in KPIM::AddresseeLineEditPrivate::searchInBaloo (this=this@entry=0x25ad480) at /var/tmp/portage/kde-apps/libkdepim-15.12.1/work/kdepim-15.12.1/libkdepim/src/addressline/addresslineedit/addresseelineedit_p.cpp:224
#18 0x00007f10fec52640 in KPIM::AddresseeLineEditPrivate::slotTriggerDelayedQueries (this=0x25ad480) at /var/tmp/portage/kde-apps/libkdepim-15.12.1/work/kdepim-15.12.1/libkdepim/src/addressline/addresslineedit/addresseelineedit_p.cpp:458
#19 0x00007f1103c91692 in QtPrivate::QSlotObjectBase::call (a=0x7ffd5456e050, r=0x25ad480, this=0x25abc10) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#20 QMetaObject::activate (sender=sender@entry=0x25ad498, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3698
#21 0x00007f1103c92237 in QMetaObject::activate (sender=sender@entry=0x25ad498, m=m@entry=0x7f1103e9b4a0 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3578
#22 0x00007f1103d01f10 in QTimer::timeout (this=this@entry=0x25ad498) at .moc/moc_qtimer.cpp:197
#23 0x00007f1103c9de02 in QTimer::timerEvent (this=0x25ad498, e=<optimized out>) at kernel/qtimer.cpp:247
#24 0x00007f1103c92b14 in QObject::event (this=0x25ad498, e=<optimized out>) at kernel/qobject.cpp:1220
#25 0x00007f11049298fc in QApplicationPrivate::notify_helper (this=this@entry=0x1b1e520, receiver=receiver@entry=0x25ad498, e=e@entry=0x7ffd5456e470) at kernel/qapplication.cpp:3716
#26 0x00007f110492e748 in QApplication::notify (this=0x7ffd5456ed00, receiver=0x25ad498, e=0x7ffd5456e470) at kernel/qapplication.cpp:3499
#27 0x00007f1103c6bb0d in QCoreApplication::notifyInternal (this=0x7ffd5456ed00, receiver=0x25ad498, event=event@entry=0x7ffd5456e470) at kernel/qcoreapplication.cpp:965
#28 0x00007f1103cb4b7d in QCoreApplication::sendEvent (event=0x7ffd5456e470, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#29 QTimerInfoList::activateTimers (this=0x1bc0370) at kernel/qtimerinfo_unix.cpp:637
#30 0x00007f1103cb5059 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#31 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:224
#32 0x00007f10f87e7994 in g_main_dispatch (context=0x7f10dc0016f0) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3122
#33 g_main_context_dispatch (context=context@entry=0x7f10dc0016f0) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3737
#34 0x00007f10f87e7be8 in g_main_context_iterate (context=context@entry=0x7f10dc0016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3808
#35 0x00007f10f87e7c8c in g_main_context_iteration (context=0x7f10dc0016f0, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1-r1/work/glib-2.44.1/glib/gmain.c:3869
#36 0x00007f1103cb535c in QEventDispatcherGlib::processEvents (this=0x1bbfff0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#37 0x00007f1103c6a75b in QEventLoop::exec (this=this@entry=0x7ffd5456e6a0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#38 0x00007f1103c71586 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#39 0x00007f1103f8571c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#40 0x00007f1104926075 in QApplication::exec () at kernel/qapplication.cpp:2976
#41 0x0000000000403f50 in main (argc=1, argv=0x7ffd5456ef38) at /var/tmp/portage/kde-apps/kdepim-15.12.1/work/kdepim-15.12.1/kmail/main.cpp:151

Reported using DrKonqi