This bug manifests itself consistently in an Xvnc4 session
(vnc4server version 4.1.1+X4.3.0-37) but not in native X
(xserver-xorg-core Version: 2:1.7.7-13).
Attached is a backtrace which was omitted from the
original gdb session attachement.
bt
#0 0xb7fe2424 in __kernel_vsyscall ()
#1 0xb7d89751 in raise () from /lib/i686/cmov/libc.so.6
#2 0xb7d8cb82 in abort () from /lib/i686/cmov/libc.so.6
#3 0xb7d828b8 in __assert_fail () from /lib/i686/cmov/libc.so.6
#4 0xb6b6286c in ?? () from /usr/lib/libcairo.so.2
#5 0xb6b64310 in ?? () from /usr/lib/libcairo.so.2
#6 0xb6b6615a in ?? () from /usr/lib/libcairo.so.2
#7 0xb6b89721 in ?? () from /usr/lib/libcairo.so.2
#8 0xb6b8e10a in ?? () from /usr/lib/libcairo.so.2
#9 0xb6b8977f in ?? () from /usr/lib/libcairo.so.2
#10 0xb6b8d207 in ?? () from /usr/lib/libcairo.so.2
#11 0xb6b8d59e in ?? () from /usr/lib/libcairo.so.2
#12 0xb6b89de5 in ?? () from /usr/lib/libcairo.so.2
#13 0xb6b5fb01 in ?? () from /usr/lib/libcairo.so.2
#14 0xb6b55c63 in cairo_paint () from /usr/lib/libcairo.so.2
#15 0xb6b55d72 in cairo_paint_with_alpha () from /usr/lib/libcairo.so.2
#16 0xb7874aa3 in gfxContext::Paint(double) ()
from /usr/lib/xulrunner-1.9.1/libxul.so
#17 0xb777f41e in ?? () from /usr/lib/xulrunner-1.9.1/libxul.so
#18 0xb777f50e in ?? () from /usr/lib/xulrunner-1.9.1/libxul.so
#19 0xb644fe74 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#20 0xb68409f2 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#21 0xb6853988 in ?? () from /usr/lib/libgobject-2.0.so.0
