plasma crashes on virtual desktop switch

[Patrick McManus]

kubuntu 9.04 on amd64... I get this crash several times a day:

Application: Plasma Workspace (plasma), signal SIGSEGV
0x00007fa214ac6d21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 20077)]

Thread 2 (Thread 0x7fa1fc549950 (LWP 20078)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1 0x00007fa2155a8939 in QWaitCondition::wait (this=0x2423b40,
mutex=0x2423b38, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2 0x00007fa1fd02ed4e in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#3 0x00007fa2155a7952 in QThreadPrivate::start (arg=0x2423b28) at
thread/qthread_unix.cpp:189
#4 0x00007fa211efc3ba in start_thread (arg=<value optimized out>) at
pthread_create.c:297
#5 0x00007fa214b04fcd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa21a20a760 (LWP 20077)):
[KCrash Handler]
#5 0x00007fa2156a7aa5 in QMetaObject::activate (sender=0x33bdd50, m=<value
optimized out>, local_signal_index=0, argv=0x7fff22250c90) at
kernel/qobject.cpp:3139
#6 0x00007fa1fdf8474f in TaskManager::AbstractGroupingStrategy::groupRemoved
() from /usr/lib/libtaskmanager.so.4
#7 0x00007fa1fdf85d2e in TaskManager::AbstractGroupingStrategy::closeGroup ()
from /usr/lib/libtaskmanager.so.4
#8 0x00007fa1fdf8c328 in ?? () from /usr/lib/libtaskmanager.so.4
#9 0x00007fa1fdf8cf0d in ?? () from /usr/lib/libtaskmanager.so.4
#10 0x00007fa2156a61f2 in QMetaObject::activate (sender=0x22c2f70,
from_signal_index=<value optimized out>, to_signal_index=22, argv=0x4) at
kernel/qobject.cpp:3069
#11 0x00007fa1fdf9c7f2 in TaskManager::TaskGroup::itemRemoved () from
/usr/lib/libtaskmanager.so.4
#12 0x00007fa1fdf88008 in TaskManager::GroupManager::remove () from
/usr/lib/libtaskmanager.so.4
#13 0x00007fa1fdf89bcb in TaskManager::GroupManager::qt_metacall () from
/usr/lib/libtaskmanager.so.4
#14 0x00007fa2156a61f2 in QMetaObject::activate (sender=0x2637a80,
from_signal_index=<value optimized out>, to_signal_index=5, argv=0x4) at
kernel/qobject.cpp:3069
#15 0x00007fa1fdf9fc15 in TaskManager::TaskManager::taskRemoved () from
/usr/lib/libtaskmanager.so.4
#16 0x00007fa1fdfa10e9 in TaskManager::TaskManager::windowRemoved () from
/usr/lib/libtaskmanager.so.4
#17 0x00007fa1fdfa2ddf in TaskManager::TaskManager::qt_metacall () from
/usr/lib/libtaskmanager.so.4
#18 0x00007fa2156a61f2 in QMetaObject::activate (sender=0x23b75c0,
from_signal_index=<value optimized out>, to_signal_index=6, argv=0x4) at
kernel/qobject.cpp:3069
#19 0x00007fa2185bcd92 in KWindowSystem::windowRemoved () from
/usr/lib/libkdeui.so.5
#20 0x00007fa2185bf2db in ?? () from /usr/lib/libkdeui.so.5
#21 0x00007fa2185ce141 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#22 0x00007fa2185ce4cb in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#23 0x00007fa2185bf5ab in ?? () from /usr/lib/libkdeui.so.5
#24 0x00007fa218491683 in KApplication::x11EventFilter () from
/usr/lib/libkdeui.so.5
#25 0x00007fa219e023b4 in ?? () from /usr/lib/libkdeinit4_plasma.so
#26 0x00007fa215e31b1f in qt_x11EventFilter (ev=0x7fff22251f30) at
kernel/qapplication_x11.cpp:375
#27 0x00007fa215e44faf in QApplication::x11ProcessEvent (this=0x224a010,
event=0x7fff22251f30) at kernel/qapplication_x11.cpp:3273
#28 0x00007fa215e6e464 in x11EventSourceDispatch (s=0x225e030, callback=0,
user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007fa2102cc20a in g_main_context_dispatch () from
/usr/lib/libglib-2.0.so.0
#30 0x00007fa2102cf8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007fa2102cfa7c in g_main_context_iteration () from
/usr/lib/libglib-2.0.so.0
#32 0x00007fa2156b9e6f in QEventDispatcherGlib::processEvents (this=0x220bea0,
flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#33 0x00007fa215e6dbef in QGuiEventDispatcherGlib::processEvents
(this=0x7fa1fe1af780, flags=<value optimized out>) at
kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007fa21568f002 in QEventLoop::processEvents (this=<value optimized
out>, flags={i = 572858912}) at kernel/qeventloop.cpp:149
#35 0x00007fa21568f3cd in QEventLoop::exec (this=0x7fff22252260, flags={i =
572858992}) at kernel/qeventloop.cpp:200
#36 0x00007fa215691694 in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:880
#37 0x00007fa219df19bb in kdemain () from /usr/lib/libkdeinit4_plasma.so
#38 0x00007fa214a3d5a6 in __libc_start_main (main=0x400890 <_start+240>,
argc=1, ubp_av=0x7fff22252568, init=0x4008c0 <__libc_csu_init>, fini=<value
optimized out>, rtld_fini=<value optimized out>,
    stack_end=0x7fff22252558) at libc-start.c:220
#39 0x00000000004007c9 in _start ()
Current language: auto; currently asm
#0 0x00007fa214ac6d21 in nanosleep () from /lib/libc.so.6
Current language: auto; currently c

I reported it to KDE as

https://bugs.kde.org/show_bug.cgi?id=198095

and they said:

"this has been fixed in 4.3; 4.1 is ~1 year old at this point, it would be worth
upgrading when 4.3 is out in a couple weeks."

.. which pretty much translates to "go see your distro". So here I am. If the bug is fixed upstream (see kde bugzilla reference) will you fix it in kubuntu 9.04 updates ? This crashes my desktop all the time. Very annoying.

[Jonathan Thomas (echidnaman)]

Right, this is fixed in KDE 4.3, and the changeset that actually fixes the bug is too large to backport to previous versions of KDE safely.