I have the same bug in Debian sid + KDE 4.2.
(gdb) bt
#0 __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:130
#1 0x00007f5b21457cc2 in pthread_cond_wait@@GLIBC_2.3.2 ()
at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:353
#2 0x00007f5b1e91388e in _xcb_conn_wait (c=0xaf7ea0, cond=0xaf8f70,
vector=0x7fff2f0283e0, count=
0xffffffffffffffff) at
/home/ancient/jd/Work/debian/libxcb/./src/xcb_conn.c:266
#3 0x00007f5b1e913e39 in _xcb_out_send (c=0xaf7ea0, vector=0x7fff2f0283e0,
count=0x7fff2f0283dc)
at /home/ancient/jd/Work/debian/libxcb/./src/xcb_out.c:338
#4 0x00007f5b1e9140e5 in xcb_writev (c=0xaf7ea0, vector=0x7fff2f028430,
count=3, requests=3)
at /home/ancient/jd/Work/debian/libxcb/./src/xcb_out.c:286
#5 0x00007f5b21cfabf6 in _XSend (dpy=0xb188d0, data=<value optimized out>,
size=0)
at ../../src/xcb_io.c:332
#6 0x00007f5b21cfad49 in _XReply (dpy=0xaf8f70, rep=0x7fff2f0284f0, extra=0,
discard=1)
at ../../src/xcb_io.c:450
#7 0x00007f5b21ceed63 in XSync (dpy=0xb188d0, discard=0) at ../../src/Sync.c:48
#8 0x00007f5b21fedffa in XRenderFindDisplay () from /usr/lib/libXrender.so.1
#9 0x00007f5b21feba5e in XRenderFreePicture () from /usr/lib/libXrender.so.1
#10 0x00007f5b14a225b4 in QX11PixmapData::release (this=0x1f75b10) at
image/qpixmap_x11.cpp:1206
#11 0x00007f5b14a22cd0 in ~QX11PixmapData (this=0xaf8f70) at
image/qpixmap_x11.cpp:1182
#12 0x00007f5b14a13a73 in QPixmap::deref (this=0x1f6c2c0) at
image/qpixmap.cpp:1322
#13 0x00007f5b14a13db4 in ~QPixmap (this=0xaf8f70) at image/qpixmap.cpp:332
#14 0x00007f5b1433bb7c in ~TileSet (this=0x1f6c1f0) at
../../../kstyles/oxygen/tileset.h:61
#15 0x00007f5b14347bd7 in OxygenStyleHelper::~OxygenStyleHelper() ()
from /usr/lib/kde4/plugins/styles/oxygen.so
#16 0x00007f5b265ddcad in *__GI_exit (status=0) at exit.c:75
#17 0x00007f5b265c75ad in __libc_start_main (main=0x401296 <main>, argc=3,
ubp_av=0x7fff2f028848, init=
0x405750 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value
optimized out>, stack_end=
0x7fff2f028838) at libc-start.c:254
#18 0x0000000000401139 in _start () at ../sysdeps/x86_64/elf/start.S:113
This seems to depend on the KDE styling, from the backtrace the actual
bug is likely in Qt or X11.
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