[Bug 29738] SIGBUS after upgrade to 2.6.36-rc1-git4 [full stacktrace]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29738

--- Comment #8 from Till Matthiesen <entropy at everymail.net> 2010-08-25 17:57:35 PDT ---
You were perfectly right Nick. Thanks for the hint.

Finally, we have the commit that triggers the issue.

commit 709ea97145c125b3811ff70429e90ebdb0e832e5
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Jul 2 15:02:16 2010 +0100

    drm: implement helper functions for scanning lru list

    These helper functions can be used to efficiently scan lru list
    for eviction. Eviction becomes a three stage process:
    1. Scanning through the lru list until a suitable hole has been found.
    2. Scan backwards to restore drm_mm consistency and find out which
       objects fall into the hole.
    3. Evict the objects that fall into the hole.

    These helper functions don't allocate any memory (at the price of
    not allowing any other concurrent operations). Hence this can also be
    used for ttm (which does lru scanning under a spinlock).

    Evicting objects in this fashion should be more fair than the current
    approach by i915 (scan the lru for a object large enough to contain
    the new object). It's also more efficient than the current approach used
    by ttm (uncoditionally evict objects from the lru until there's enough
    free space).

    Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Acked-by: Thomas Hellstrom <thellstrom at vmwgfx.com>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Signed-off-by: Dave Airlie <airlied at redhat.com>

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