[kmail2] [Bug 388103] New: Restarting akonadi server with failing imap caused kmail to crash on startup

Con Kolivas bugzilla_noreply at kde.org
Thu Dec 21 04:10:14 GMT 2017 

https://bugs.kde.org/show_bug.cgi?id=388103

            Bug ID: 388103
           Summary: Restarting akonadi server with failing imap caused
                    kmail to crash on startup
           Product: kmail2
           Version: 5.2.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at kolivas.org
  Target Milestone: ---

Application: kmail (5.2.3)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.14.3-ck1+ x86_64
Distribution: Ubuntu 17.04

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

My imap inbox was misbehaving - every email I deleted would reappear as new in
the inbox. I tried restarting kmail and that did not help, then I restarted the
akonadi server vial akonadi console and then no inbox was showing up in kmail.
I quit kmail and restarted it and it crashed.

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 0x7f7ae0375940 (LWP 20818))]

Thread 25 (Thread 0x7f7a8a2a8700 (LWP 22317)):
#0  0x00007f7add4778ad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1674b30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad1630042 in g_main_context_check () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad1630514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7ad36396da in start_thread (arg=0x7f7a8a2a8700) at
pthread_create.c:456
#10 0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 24 (Thread 0x7f7a937fe700 (LWP 22315)):
#0  0x00007f7ad1675ef4 in g_mutex_unlock () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad1630696 in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7ad36396da in start_thread (arg=0x7f7a937fe700) at
pthread_create.c:456
#7  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 23 (Thread 0x7f7a89aa7700 (LWP 22313)):
#0  0x00007f7ad1675ef4 in g_mutex_unlock () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad162f4be in g_main_context_acquire () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad1630425 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7ad36396da in start_thread (arg=0x7f7a89aa7700) at
pthread_create.c:456
#9  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7f7a892a6700 (LWP 22311)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1630576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7a892a6700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7f7a93fff700 (LWP 22309)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1630576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7a93fff700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7f7a233fe700 (LWP 22307)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1630576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7a233fe700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7f7a219a8700 (LWP 22177)):
#0  0x00007f7ad162fa6d in g_main_context_prepare () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad163049b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7a219a8700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7f7a223b8700 (LWP 22173)):
#0  0x00007f7add4778ad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1674b30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad1630042 in g_main_context_check () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad1630514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7ad36396da in start_thread (arg=0x7f7a223b8700) at
pthread_create.c:456
#10 0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7f7a9bfff700 (LWP 22069)):
#0  0x00007f7ad1675ef4 in g_mutex_unlock () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad162fb70 in g_main_context_prepare () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163049b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7ad36396da in start_thread (arg=0x7f7a9bfff700) at
pthread_create.c:456
#9  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f7ab0ac8700 (LWP 22060)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1630576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7ab0ac8700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f7a20b35700 (LWP 20877)):
#0  0x00007f7ad162fd07 in g_main_context_query () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad16304e8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7a20b35700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f7a23fff700 (LWP 20854)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a23fff700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f7a408b2700 (LWP 20853)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a408b2700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f7a410b3700 (LWP 20852)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a410b3700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f7a418b4700 (LWP 20851)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a418b4700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f7a420b5700 (LWP 20850)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a420b5700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f7a428b6700 (LWP 20849)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0bf8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a428b6700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f7a430b7700 (LWP 20848)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace0be7b1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3e7641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a430b7700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f7a92ffd700 (LWP 20835)):
#0  0x00007f7ad363f510 in pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7ace3b694b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7ace3b6989 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7ad36396da in start_thread (arg=0x7f7a92ffd700) at
pthread_create.c:456
#4  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f7ab12c9700 (LWP 20825)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad1630576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7ad36396da in start_thread (arg=0x7f7ab12c9700) at
pthread_create.c:456
#8  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f7ab1aca700 (LWP 20823)):
#0  0x00007f7ad1675ed9 in g_mutex_lock () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad162fa79 in g_main_context_prepare () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7ad163049b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7ad36396da in start_thread (arg=0x7f7ab1aca700) at
pthread_create.c:456
#9  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f7ab2957700 (LWP 20822)):
#0  0x00007f7ad1675ef4 in g_mutex_unlock () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7ad1630696 in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7ad36396da in start_thread (arg=0x7f7ab2957700) at
pthread_create.c:456
#7  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f7ab3fff700 (LWP 20821)):
#0  0x00007f7addd89139 in QMutex::unlock() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f7addfb49a5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f7ad162ff89 in g_main_context_check () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7ad1630514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7addfb50bb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addd8cf83 in QThread::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7adc3db5d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f7ad36396da in start_thread (arg=0x7f7ab3fff700) at
pthread_create.c:456
#11 0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f7ab9c57700 (LWP 20820)):
#0  0x00007f7add47bd8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7ad0519c62 in poll (__timeout=-1, __nfds=1, __fds=0x7f7ab9c56b80)
at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f7ad0519c62 in _xcb_conn_wait (c=c at entry=0x55796952b440,
cond=cond at entry=0x55796952b480, vector=vector at entry=0x0, count=count at entry=0x0)
at ../../src/xcb_conn.c:459
#3  0x00007f7ad051b8d7 in xcb_wait_for_event (c=0x55796952b440) at
../../src/xcb_in.c:693
#4  0x00007f7abc1baef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#5  0x00007f7addd91c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7ad36396da in start_thread (arg=0x7f7ab9c57700) at
pthread_create.c:456
#7  0x00007f7add487d7f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f7ae0375940 (LWP 20818)):
[KCrash Handler]
#6  0x00007f7adde120cc in
QtSharedPointer::ExternalRefCountData::getAndRef(QObject const*) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7addf99220 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7addf99393 in QTimer::singleShotImpl(int, Qt::TimerType, QObject
const*, QtPrivate::QSlotObjectBase*) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7adfc99c18 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#10 0x00007f7adfca2c4d in KMKernel::toggleSystemTray() () at
/usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#11 0x00007f7adfce0e0b in KMMainWidget::readConfig() () at
/usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#12 0x00007f7adfce14f1 in KMMainWidget::KMMainWidget(QWidget*, KXMLGUIClient*,
KActionCollection*, QExplicitlySharedDataPointer<KSharedConfig>) () at
/usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#13 0x00007f7adfc8e10a in KMMainWin::KMMainWin(QWidget*) () at
/usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#14 0x00007f7adfc9eead in KMKernel::openReader(bool) () at
/usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#15 0x00007f7adfca8ab4 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
#16 0x00007f7adfca9fed in KMKernel::handleCommandLine(bool, QStringList const&,
QString const&) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#17 0x000055796834c3d1 in  ()
#18 0x00007f7ae009a07e in
KontactInterface::PimUniqueApplication::newInstance(QByteArray const&,
QStringList const&, QString const&) () at
/usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#19 0x00007f7ae009b0d2 in  () at
/usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#20 0x00007f7ae009b483 in
KontactInterface::PimUniqueApplication::qt_metacall(QMetaObject::Call, int,
void**) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#21 0x00007f7adc3e5570 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#22 0x00007f7adc3e9392 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#23 0x00007f7adc3e994c in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#24 0x00007f7adc3ec35e in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#25 0x00007f7addf8d639 in QObject::event(QEvent*) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7ade4a09a4 in QGuiApplication::event(QEvent*) () at
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#27 0x00007f7adf12110f in QApplication::event(QEvent*) () at
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f7adf11b35c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f7adf122b21 in QApplication::notify(QObject*, QEvent*) () at
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f7addf60c00 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f7addf6339d in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f7addfb4c93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f7ad1630377 in g_main_context_dispatch () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f7ad16305e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f7ad163068c in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f7addfb509f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007f7addf5ebea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f7addf6733c in QCoreApplication::exec() () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x000055796834b8af in  ()
#40 0x00007f7add39f3f1 in __libc_start_main (main=0x55796834a7e0, argc=3,
argv=0x7ffeb2b74c08, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffeb2b74bf8) at ../csu/libc-start.c:291
#41 0x000055796834bf9a in _start ()

Reported using DrKonqi

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