Bug 34399

Summary: SIGSEGV in intel_pixmap_is_busy(priv) [priv=NULL]
Product: xorg Reporter: Cyril Brulebois <kibi>
Component: Driver/intelAssignee: Chris Wilson <chris>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: kibi
Version: git   
Hardware: Other   
OS: All   
URL: http://bugs.debian.org/613830
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Description Cyril Brulebois 2011-02-17 08:09:57 UTC 
Created attachment 43488 [details]
GDB session

Hi,

from Enrico Zini, in Debian's #613830 (http://bugs.debian.org/613830), opening a given pptx file with openoffice-impress leads to an X crash, with xorg-server/1.7 (running on 2.6.32); I reproduced it with latest server-1.9-branch, and latest xf86-video-intel's master (running on 2.6.37).

I'm attaching a backtrace, which shows priv's being NULL, and intel_pixmap_is_busy() which doesn't like that. :)
Comment 1 Cyril Brulebois 2011-02-17 08:17:25 UTC 
Hmm, the file is too heavy for bugzilla (2MB), so I'm linking to it:
  http://store.enricozini.org/crash-x.pptx

(The link is also in the Debian bug report.)
Comment 2 Chris Wilson 2011-02-17 08:54:06 UTC 
commit 4c66b28870b050493ad96f7b0fe2d70d7ee539c7
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Feb 17 16:48:24 2011 +0000

    uxa: Fallback if the temporary is too large
    
    If the render operation requires a temporary source Picture and the
    operation is large, larger than the maximum permitted bo, then we will
    fail to allocate the bo. In this case, we need to fallback and perform
    the operation on the CPU rather than dereference a NULL bo.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34399
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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