Bug 156802

I can confirm this bug. However, for me it is sufficient to just delete the wallpaper (no need to delete the corresponding folder).

The backtrace of this crash is:

Application: Plasma Workspace (plasma), signal SIGFPE
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0xb62d56e0 (LWP 2336)]
[New Thread 0xb381fb90 (LWP 2416)]
[New Thread 0xb4b84b90 (LWP 2338)]
QEventDispatcherUNIXPrivate::doSelect (this=0x8074b18, flags=@0xbfeb2f98, 
    timeout=0xbfeb2f90) at kernel/qeventdispatcher_unix.cpp:175
	in kernel/qeventdispatcher_unix.cpp
[Current thread is 0 (LWP 2336)]

Thread 3 (Thread 0xb4b84b90 (LWP 2338)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7320586 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb73690e0 in QWaitCondition::wait (this=0x81108ec, mutex=0x81108e8, 
    time=4294967295) at thread/qwaitcondition_unix.cpp:267
#3  0xb4dc58fb in RenderThread::run (this=0x81108e0)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/plasma/containments/desktop/renderthread.cpp:84
#4  0xb73685de in QThreadPrivate::start (arg=0x81108e0)
    at thread/qthread_unix.cpp:179
#5  0xb731c18b in start_thread (arg=0xb4b84b90) at pthread_create.c:296
#6  0xb660935e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb381fb90 (LWP 2416)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb65d59e6 in nanosleep () from /lib/libc.so.6
#2  0xb65d580b in __sleep (seconds=0)
    at ../sysdeps/unix/sysv/linux/sleep.c:138
#3  0xb7a4fe42 in KCrash::startDrKonqi (argv=0xb381ee6c, argc=17)
    at /var/tmp/portage/kde-base/kdelibs-9999.4/work/kdelibs-9999.4/kdeui/util/kcrash.cpp:366
#4  0xb7a5045b in KCrash::defaultCrashHandler (sig=8)
    at /var/tmp/portage/kde-base/kdelibs-9999.4/work/kdelibs-9999.4/kdeui/util/kcrash.cpp:287
#5  <signal handler called>
#6  0xb4dc5d33 in RenderThread::run (this=0x8241adc)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/plasma/containments/desktop/renderthread.cpp:153
#7  0xb73685de in QThreadPrivate::start (arg=0x8241adc)
    at thread/qthread_unix.cpp:179
#8  0xb731c18b in start_thread (arg=0xb381fb90) at pthread_create.c:296
#9  0xb660935e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb62d56e0 (LWP 2336)):
#0  QEventDispatcherUNIXPrivate::doSelect (this=0x8074b18, flags=@0xbfeb2f98, 
    timeout=0xbfeb2f90) at kernel/qeventdispatcher_unix.cpp:175
#1  0xb745c98b in QEventDispatcherUNIX::processEvents (this=0x8073d80, 
    flags=@0xbfeb30a8) at kernel/qeventdispatcher_unix.cpp:886
#2  0xb6b5dcce in QEventDispatcherX11::processEvents (this=0x8073d80, 
    flags=@0xbfeb30d4) at kernel/qeventdispatcher_x11.cpp:145
#3  0xb7432191 in QEventLoop::processEvents (this=0xbfeb3140, 
    flags=@0xbfeb3108) at kernel/qeventloop.cpp:140
#4  0xb743229a in QEventLoop::exec (this=0xbfeb3140, flags=@0xbfeb3148)
    at kernel/qeventloop.cpp:186
#5  0xb7434626 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:759
#6  0xb6ad3487 in QApplication::exec () at kernel/qapplication.cpp:3053
#7  0xb7fa5d54 in kdemain (argc=1, argv=0xbfeb3344)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/plasma/plasma/main.cpp:54
#8  0x080487e2 in main (argc=-1219868949, argv=0xb74a46f0)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase_build/workspace/plasma/plasma/plasma-qgv_dummy.cpp:3
#9  0xb655dfdc in __libc_start_main (main=0x80487c0 <main>, argc=1, 
    ubp_av=0xbfeb3344, init=0x8048810 <__libc_csu_init>, 
    fini=0x8048800 <__libc_csu_fini>, rtld_fini=0xb7fc0100 <_dl_fini>, 
    stack_end=0xbfeb333c) at libc-start.c:229
#10 0x08048731 in _start ()
175	in kernel/qeventdispatcher_unix.cpp

*** This bug has been marked as a duplicate of 156944 ***