Created attachment 635562 [details]
backtrace

With current kde5, following sometimes occur (seemingly randomly):
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f49d36a10b2 in QGuiApplication::platformNativeInterface () at
kernel/qguiapplication.cpp:1462
1462    kernel/qguiapplication.cpp: No such file or directory.
(gdb) set pagination off
(gdb) bt
#0  0x00007f49d36a10b2 in QGuiApplication::platformNativeInterface () at
kernel/qguiapplication.cpp:1462
#1  0x00007f49d12979f0 in QX11Info::display () at qx11info_x11.cpp:337
#2  0x00007f49d3cd4f2c in KCrash::defaultCrashHandler (sig=11) at
/usr/src/debug/kcrash-5.10.0/src/kcrash.cpp:430
#3  <signal handler called>
#4  0x00007f49ca8e6c69 in ?? ()
#5  0x0000000000000000 in ?? ()