Bug 14211

Summary:	locking assertion failure, libsdl
Product:	XCB	Reporter:	Timo Aaltonen <tjaalton>
Component:	Library	Assignee:	Jamey Sharp <jamey>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	1.1
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Timo Aaltonen 2008-01-23 03:27:40 UTC

Forwarded from https://launchpad.net/bugs/185311 :

"If I run Savage (a 3D non-open source game for Linux, available for download on the internet), I get loads of these messages:

silverback.bin: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed.
Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb6def767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb6def81e]
#2 /usr/lib/libX11.so.6 [0xb76ca5f8]
#3 /usr/lib/libX11.so.6(XUnmapWindow+0x25) [0xb76c0fb5]
#4 libs/libSDL-1.2.so.0 [0xb7e76f01]
#5 libs/libSDL-1.2.so.0 [0xb7e7840e]
#6 libs/libSDL-1.2.so.0(SDL_VideoQuit+0x52) [0xb7e6e99a]
#7 libs/libSDL-1.2.so.0(SDL_QuitSubSystem+0x8c) [0xb7e50298]
#8 libs/libSDL-1.2.so.0(SDL_Quit+0x20) [0xb7e502ec]
#9 ./silverback.bin [0x80a95d3]
silverback.bin: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed.
Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb6def767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb6def81e]
#2 /usr/lib/libX11.so.6 [0xb76ca5f8]
#3 /usr/lib/libX11.so.6(XUnmapWindow+0x25) [0xb76c0fb5]
#4 libs/libSDL-1.2.so.0 [0xb7e76f01]
#5 libs/libSDL-1.2.so.0 [0xb7e7840e]
#6 libs/libSDL-1.2.so.0(SDL_VideoQuit+0x52) [0xb7e6e99a]
#7 libs/libSDL-1.2.so.0(SDL_QuitSubSystem+0x8c) [0xb7e50298]
#8 libs/libSDL-1.2.so.0(SDL_Quit+0x20) [0xb7e502ec]
#9 ./silverback.bin [0x80a95d3]
silverback.bin: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed.
Locking assertion failure. Backtrace:
Segmentation fault (core dumped)

I searched the web for this error, and it seems like running another 3d game, neverwinter nights, causes the same problem on Hardy.
Here's a link to that:
http://ubuntuforums.org/archive/index.php/t-666726.html
"

Comment 1 Josh Triplett 2008-03-15 22:13:24 UTC

Jamey and I just announced a set of changes to XCB and Xlib/XCB which, among other things, should address all the outstanding synchronization problems that we know of.  Could anyone experiencing this bug please build XCB and Xlib with the patches found at http://lists.freedesktop.org/archives/xcb/2008-March/003347.html and retest?

Comment 2 Bryce Harrington 2008-06-19 11:56:24 UTC

Several of those patches fail to apply to the last released libxcb.  Are they in a git tree we can pull from?

Comment 3 Bryce Harrington 2009-03-18 23:44:57 UTC

Ping?  Any new status on this?

Comment 4 Jamey Sharp 2009-07-06 14:02:54 UTC

The socket handoff patches have been shipping for a while now. This bug shouldn't be relevant any more. Sorry for the lack of feedback in the meantime, though.

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