Bug 5375

Summary:	xcb-demo/tests/lissajoux hangs in XCBImageSHMGet()
Product:	XCB	Reporter:	Bart Massey <x>
Component:	Demos	Assignee:	Bart Massey <x>
Status:	RESOLVED WORKSFORME	QA Contact:
Severity:	major
Priority:	high
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Bart Massey 2005-12-18 12:24:57 UTC

Specifically, when invoked with argument 1 to get shared memory, lissajoux will
hang in its first attempt to force the cookie returned by XCBImageSHMGet(). 
This call is hung inside XCBShmGetImage(), which is in turn hung in the bowels
of XCB waiting for a reply which apparently never comes.  Whee.

Comment 1 Daniel Stone 2006-02-19 12:54:13 UTC

(sorry for the noise, just testing bz)

Comment 2 Bart Massey 2006-02-20 10:27:11 UTC

I should have assigned myself this.

Comment 3 Bart Massey 2006-02-20 10:28:44 UTC

I fixed this long ago, but didn't realize there was a Bugzilla bug for it.  In
brief, code in xcb-util had an off-by-one that was causing it to infinite loop.

Comment 4 Ian Osgood 2006-03-02 06:07:14 UTC

This is still a problem for me testing on Mac OS X 10.4.  Exact same hang point, xcb_image.c:471 call to 
XCBShmGetImageReply()

Comment 5 Bart Massey 2006-03-02 15:34:57 UTC

I can't reproduce this bug on my x86 box, which makes me think it is a separate
bug.  The bug I reported and fixed still seems to be fixed in the source; it was
a complicated interaction involving an off-by-one in XCBAuxGetScreen() and
failure to pass structures by address that were being modified in lissajoux.c.

More information about the failure should be gathered and probably a new bug filed.

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