Application: kwin (4.11.20)
KDE Platform Version: 4.14.9
Qt Version: 4.8.6
Operating System: Linux 3.16.7-35-desktop x86_64
Distribution: "openSUSE 13.2 (Harlequin) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
I used ssh -X to another Linux machine and ran thunderbird on it.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6aa3aea800 (LWP 1711))]

Thread 4 (Thread 0x7f6a81ef7700 (LWP 1717)):
#0  0x00007f6a9d10003f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f6aa24ca8cb in  () at /usr/lib64/libQtScript.so.4
#2  0x00007f6aa24ca909 in  () at /usr/lib64/libQtScript.so.4
#3  0x00007f6a9d0fc0a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f6aa32c900d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f69ee766700 (LWP 2753)):
#0  0x00007f6aa32c0bdd in poll () at /lib64/libc.so.6
#1  0x00007f6a8b502ce1 in __libc_res_nsend () at /lib64/libresolv.so.2
#2  0x00007f6a8b500c0c in __libc_res_nquery () at /lib64/libresolv.so.2
#3  0x00007f6a8b501210 in __libc_res_nquerydomain () at /lib64/libresolv.so.2
#4  0x00007f6a8b5016bd in __libc_res_nsearch () at /lib64/libresolv.so.2
#5  0x00007f69ed35dadb in _nss_dns_gethostbyname4_r () at /lib64/libnss_dns.so.2
#6  0x00007f6aa32b48a4 in gaih_inet () at /lib64/libc.so.6
#7  0x00007f6aa32b699a in getaddrinfo () at /lib64/libc.so.6
#8  0x00007f6aa35fb7ab in  () at /usr/lib64/libkdeinit4_kwin.so
#9  0x00007f6aa35fcba1 in  () at /usr/lib64/libkdeinit4_kwin.so
#10 0x00007f6a9d3866ae in  () at /usr/lib64/libQtCore.so.4
#11 0x00007f6a9d39279f in  () at /usr/lib64/libQtCore.so.4
#12 0x00007f6a9d0fc0a4 in start_thread () at /lib64/libpthread.so.0
#13 0x00007f6aa32c900d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f69edf65700 (LWP 2754)):
#0  0x00007f6aa32c0bdd in poll () at /lib64/libc.so.6
#1  0x00007f6a8b502ce1 in __libc_res_nsend () at /lib64/libresolv.so.2
#2  0x00007f6a8b500c0c in __libc_res_nquery () at /lib64/libresolv.so.2
#3  0x00007f6a8b501210 in __libc_res_nquerydomain () at /lib64/libresolv.so.2
#4  0x00007f6a8b5016bd in __libc_res_nsearch () at /lib64/libresolv.so.2
#5  0x00007f69ed35dadb in _nss_dns_gethostbyname4_r () at /lib64/libnss_dns.so.2
#6  0x00007f6aa32b48a4 in gaih_inet () at /lib64/libc.so.6
#7  0x00007f6aa32b699a in getaddrinfo () at /lib64/libc.so.6
#8  0x00007f6aa35fb7ab in  () at /usr/lib64/libkdeinit4_kwin.so
#9  0x00007f6aa35fcba1 in  () at /usr/lib64/libkdeinit4_kwin.so
#10 0x00007f6a9d3866ae in  () at /usr/lib64/libQtCore.so.4
#11 0x00007f6a9d39279f in  () at /usr/lib64/libQtCore.so.4
#12 0x00007f6a9d0fc0a4 in start_thread () at /lib64/libpthread.so.0
#13 0x00007f6aa32c900d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f6aa3aea800 (LWP 1711)):
[KCrash Handler]
#5  0x00007f6a9d4ad031 in QObject::~QObject() () at /usr/lib64/libQtCore.so.4
#6  0x00007f6aa3655ed3 in  () at /usr/lib64/libkdeinit4_kwin.so
#7  0x00007f6aa365623d in  () at /usr/lib64/libkdeinit4_kwin.so
#8  0x00007f6aa36147c3 in  () at /usr/lib64/libkdeinit4_kwin.so
#9  0x00007f6aa3615a05 in  () at /usr/lib64/libkdeinit4_kwin.so
#10 0x00007f6aa36098f0 in  () at /usr/lib64/libkdeinit4_kwin.so
#11 0x00007f6a9c6786fc in  () at /usr/lib64/libQtGui.so.4
#12 0x00007f6a9c6861f9 in QApplication::x11ProcessEvent(_XEvent*) () at /usr/lib64/libQtGui.so.4
#13 0x00007f6a9c6adf30 in  () at /usr/lib64/libQtGui.so.4
#14 0x00007f6a9d492e6f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#15 0x00007f6a9d493165 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#16 0x00007f6a9d4985b9 in QCoreApplication::exec() () at /usr/lib64/libQtCore.so.4
#17 0x00007f6aa360a7a3 in kdemain () at /usr/lib64/libkdeinit4_kwin.so
#18 0x00007f6aa3205b05 in __libc_start_main () at /lib64/libc.so.6
#19 0x000000000040075e in _start ()

Reported using DrKonqi