Ubuntu
xorg-server package

  1. Bug #876762
  2. Comment #5

Comment 5 for bug 876762

Revision history for this message
Thilo-Alexander Ginkel (thilo.ginkel) wrote :

I bi-sected xserver-xorg-video-intel (as available at git://git.debian.org/git/pkg-xorg/driver/xserver-xorg-video-intel, which is what the Ubuntu packages are based on). The first bad commit is:

commit 2608a367acba7247e50754c3daeed09ba2e97d05
Author: Chris Wilson <email address hidden>
Date: Mon Jul 11 16:28:15 2011 +0100

    dri: Prevent abuse of the Resource database

    The Resource database is only designed to store a single value for a
    particular type associated with an XID. Due to the asynchronous nature
    of the vblank/flip requests, we would often associate multiple frame
    events with a particular drawable/client. Upon freeing the resource, we
    would not necessarily decouple the right value, leaving a stale pointer
    behind. Later when the client disappeared, we would write through that
    stale pointer upsetting valgrind and causing memory corruption. MDK.

    Instead, we need to implement an extra layer for tracking multiple
    frames within a single Resource.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=37700
    Signed-off-by: Chris Wilson <email address hidden>