[Bug 89388] [all bisected]system hang and BUG: unable to handle kernel NULL pointer dereference at 0000000000000084 when kill X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89388

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|bisect_pending              |
             Status|NEEDINFO                    |NEW
           Assignee|intel-gfx-bugs at lists.freede |matthew.d.roper at intel.com
                   |sktop.org                   |
            Summary|[all regression]system hang |[all bisected]system hang
                   |and BUG: unable to handle   |and BUG: unable to handle
                   |kernel NULL pointer         |kernel NULL pointer
                   |dereference at              |dereference at
                   |0000000000000084 when kill  |0000000000000084 when kill
                   |X                           |X

--- Comment #3 from lu hua <huax.lu at intel.com> ---
Bisect shows: fd2d61341bf39d1054256c07d6eddd624ebc4241 is the first bad commit
commit fd2d61341bf39d1054256c07d6eddd624ebc4241
Author:     Matt Roper <matthew.d.roper at intel.com>
AuthorDate: Fri Feb 27 10:12:01 2015 -0800
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Fri Feb 27 19:56:17 2015 +0100

    drm/i915: Use plane->state->fb in watermark code (v2)

    plane->fb is a legacy pointer that not always be up-to-date (or updated
    early enough).  Make sure the watermark code uses plane->state->fb so
    that we're always doing our calculations based on the correct
    framebuffers.

    This patch was generated by Coccinelle with the following semantic
    patch:

            @@
            struct drm_plane *P;
            @@
            - P->fb
            + P->state->fb

    v2: Rebase

    Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

Revert this commit, this issue goes away.

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