Version:            (using Devel)
Installed from:    Compiled sources

Last evening I suspended my PC. Today I started and after a (short) while I got a dialog that Kontact crashed. It wasn't even in foreground, so I don't know what it did, maybe it started to check mail:
Application: Kontact (kontact), signal SIGSEGV
[?1034h[Thread debugging using libthread_db enabled]
[New Thread 0x7f44d3bfb700 (LWP 5081)]
[New Thread 0x4129a950 (LWP 5190)]
[KCrash handler]
#5  0x00007f44d227cb54 in QBasicAtomicInt::ref ()
   from /opt/qt4/lib/libQt3Support.so.4
#6  0x00007f44ce14e985 in QUrl::QUrl () from /opt/qt4/lib/libQtCore.so.4
#7  0x00007f44cf122ec9 in KUrl (this=0x20003a006e006f, u=@0x22d19b8)
    at /data/development/sources/kde-trunk/kdelibs/kdecore/io/kurl.cpp:412
#8  0x00007f44d098514d in ?? () from /opt/kde4/lib64/libkio.so.5
#9  0x000000000000abc0 in ?? ()
#10 0x00007fffdbc583b0 in ?? ()
#11 0x00007fffdbc583c0 in ?? ()
#12 0x00007fffdbc58340 in ?? ()
#13 0x00007fffdbc58360 in ?? ()
#14 0x00007fffdbc58350 in ?? ()
#15 0x00007fffdbc583d0 in ?? ()
#16 0x00007fffdbc583e0 in ?? ()
#17 0x00007fffdbc58330 in ?? ()
#18 0x00007fffdbc582f0 in ?? ()
#19 0x0000000000dffa70 in ?? ()
#20 0x00007f44ce0bedcb in QListData::remove () from /opt/qt4/lib/libQtCore.so.4
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
#0  0x00007f44c7da0261 in nanosleep () from /lib64/libc.so.6