Bug 480293

Description of problem:
In KDE 4.2 RC (packages taken from kde-testing repository) the plasmoid "Blue Marble" crashes when it is closed. Plasma developer supposes it's a driver bug.
Here's the bug report in KDE bugzilla:
https://bugs.kde.org/show_bug.cgi?id=180895

Version-Release number of selected component (if applicable):
- kernel 2.6.27.9-163
- drv-ati 6.9.0-63
- kde 4.1.96
- mesa 7.2.0-15

How reproducible:
Always reproducible

Steps to Reproduce:
1. Start KDE 4
2. Add the Blue Marble plasmoid, you get the following text in the plasmoid: "This object cannot be created for the following reason: OpenGL shaders unsupported.", however it doesn't crash right now.
3. Click the X to close the plasmoid: you get the crash.
  
Additional info:

Here you are the backtrace:
Applicazione: Spazio di lavoro di Plasma (plasma), segnale SIGABRT
[Current thread is 1 (Thread 0xb80459a0 (LWP 4620))]

Thread 3 (Thread 0xace4ab90 (LWP 4627)):
#0  0x00110416 in __kernel_vsyscall ()
#1  0x008f5105 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x036257a2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x004c1a72 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x0362475e in ?? () from /usr/lib/libQtCore.so.4
#5  0x008f151f in start_thread () from /lib/libpthread.so.0
#6  0x0082704e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xac449b90 (LWP 4628)):
#0  0x00110416 in __kernel_vsyscall ()
#1  0x008f5105 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x036257a2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x01054c6a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#4  0x0362475e in ?? () from /usr/lib/libQtCore.so.4
#5  0x008f151f in start_thread () from /lib/libpthread.so.0
#6  0x0082704e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb80459a0 (LWP 4620)):
[KCrash Handler]
#6  0x00110416 in __kernel_vsyscall ()
#7  0x0076e460 in raise () from /lib/libc.so.6
#8  0x0076fe28 in abort () from /lib/libc.so.6
#9  0x0076740e in __assert_fail () from /lib/libc.so.6
#10 0x0107a1f6 in radeonGetLock (rmesa=0x885a0a0, flags=0) at radeon_lock.c:100
#11 0x01084ebf in r300FlushCmdBuf (r300=0x885a0a0, caller=0x10a9234 "r300DestroyContext") at r300_cmdbuf.c:153
#12 0x0107eb41 in r300DestroyContext (driContextPriv=0x8c050e8) at r300_context.c:410
#13 0x01077c9a in radeonDestroyContext (driContextPriv=0x6) at radeon_screen.c:1431
#14 0x01074da9 in driDestroyContext (pcp=0x8c050e8) at ../common/dri_util.c:516
#15 0x021a533c in driDestroyContext (context=0x8bfdd08, psc=0x882ac08, dpy=0x87fa2c0) at dri_glx.c:444
#16 0x0218833f in DestroyContext (dpy=0x87fa2c0, gc=0x882ce78) at glxcmds.c:522
#17 0x04f0f624 in QGLContext::reset () from /usr/lib/libQtOpenGL.so.4
#18 0x04ee4ecc in QGLContext::~QGLContext () from /usr/lib/libQtOpenGL.so.4
#19 0x04ede6c5 in QGLWidget::~QGLWidget () from /usr/lib/libQtOpenGL.so.4
#20 0x0474f63d in ~GLAppletPrivate () at /usr/src/debug/kdelibs-4.1.96/plasma/glapplet.cpp:38
#21 ~GLApplet (this=0x882a3d0) at /usr/src/debug/kdelibs-4.1.96/plasma/glapplet.cpp:93
#22 0x069d8baa in ?? () from /usr/lib/kde4/plasma_applet_bluemarble.so
#23 0x0372317c in qDeleteInEventHandler () from /usr/lib/libQtCore.so.4
#24 0x03724b33 in QObject::event () from /usr/lib/libQtCore.so.4
#25 0x04417a27 in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#26 0x03e5962c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#27 0x03e6146e in QApplication::notify () from /usr/lib/libQtGui.so.4
#28 0x039c170d in KApplication::notify (this=0x87fa9b0, receiver=0x882a3d0, event=0x8aa8b80) at /usr/src/debug/kdelibs-4.1.96/kdeui/kernel/kapplication.cpp:307
#29 0x037151c1 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#30 0x03715e45 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#31 0x0371603d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#32 0x0373fbaf in ?? () from /usr/lib/libQtCore.so.4
#33 0x0352b238 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#34 0x0352e8e3 in ?? () from /lib/libglib-2.0.so.0
#35 0x0352eaa1 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#36 0x0373f7f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#37 0x03ef24b5 in ?? () from /usr/lib/libQtGui.so.4
#38 0x0371388a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#39 0x03713a4a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#40 0x03716105 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#41 0x03e594a7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#42 0x00138e26 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#43 0x080486f2 in _start ()