From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 31617] New: Radeon/Compiz: 'failed to attach dri2 front
	buffer', error case not handled
Date: Sun, 14 Nov 2010 04:10:14 -0800 (PST)
Message-ID: <bug-31617-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=31617

           Summary: Radeon/Compiz: 'failed to attach dri2 front buffer',
                    error case not handled
           Product: Mesa
           Version: 7.9
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: daniel.lichtenberger@gmail.com


Created an attachment (id=40267)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40267)
backtrace

System: Fedora 14, Radeon 4850, x86_64.

Using the system's mesa-dri-drivers package Compiz frequently crashes while
resizing windows. The backtrace (attached) and the error message, "failed to
attach dri2 front buffer XX", point to radeon_update_renderbuffers in
radeon_common_context.c around line 745:

            bo = radeon_bo_open(...);

            if (bo == NULL) {

                fprintf(stderr, "failed to attach %s %d\n",
                    regname, buffers[i].name);

            }

            ret = radeon_bo_get_tiling(bo, &tiling_flags, &pitch);


An error message is printed when 'bo' could not be allocated, but bo is then
happily dereferenced in radeon_bo_get_tiling afterwards. Working around the
null pointer dereference (e.g. by adding a 'continue' in the "if bo==NULL"
block) fixes the crash for me and I haven't seen visual artifacts yet, although
the error message is printed from time to time while running Compiz.

The same stacktrace was logged by several people over at
https://bugzilla.redhat.com/show_bug.cgi?id=568593.

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