[Qt-interest] Crash with OpenGL QGraphicsView Viewport on Exit

[Josiah Bryan]

I've got a test case that crashes upon program exit with:

xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.

But only if I use a QGLWidget as the QGRaphicsView viewport - normal 
viewport does not crash on exit.

GDB reports:

Program received signal SIGABRT, Aborted.
[Switching to Thread -1208550960 (LWP 18248)]
0x00110402 in __kernel_vsyscall ()
(gdb) bt
#0  0x00110402 in __kernel_vsyscall ()
#1  0x01e3a690 in raise () from /lib/libc.so.6
#2  0x01e3bf91 in abort () from /lib/libc.so.6
#3  0x01e3393e in __assert_fail () from /lib/libc.so.6
#4  0x00270714 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
#5  0x03173168 in ?? () from /usr/lib/libX11.so.6
#6  0x008651d5 in ?? () from /usr/lib/libGL.so.1
#7  0x085cb0d0 in ?? ()
#8  0x0870bf90 in ?? ()
#9  0x087080e0 in ?? ()
#10 0x008346d9 in ?? () from /usr/lib/libGL.so.1
#11 0x085cb0d0 in ?? ()
#12 0x00000003 in ?? ()
#13 0x00000000 in ?? ()
(gdb) q

This occurs on both Qt 4.5.2 and the Git version of 4.7.0. Sample code 
attached that reproduces problem.

Any ideas on how to fix this?

Thanks!
-josiah



-- 

-=-=-=-=-=-=-=-=-=-=-=-=-
Josiah Bryan
Productive Concepts, Inc.
jbryan at pciint.com
(765) 964-6009, ext. 224
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