[Bug 103964] BUG: sleeping function called from invalid context at ./include/linux/percpu-rwsem.h:34

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103964

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEEDINFO                    |RESOLVED

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit b5e0a9418e09a7b6df1728a26832c7c34aa1adf8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Dec 1 00:15:36 2017 +0000

    drm/i915: Set fake_vma.size as well as fake_vma.node.size for capture

    When capturing the bo, we allocate an error object with an array of
    min(vma->size, vma->node.size) pages, plus a bit for compression overhead.
    However, when creating the fake vma to describe the bo, only one of the
    sizes was filled in, resulting in a too small array. Through my and CI
    testing, this was sufficient for the mostly empty NULL context as
    it compressed well (or the out-of-bounds access simply didn't cause an
    issue). However, in real workloads on Cannonlake, we were overflowing
    that array and causing havoc with the random memory corruption.

    Reported-by: Rafael Antognolli <rafael.antognolli at intel.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103964
    Fixes: 4e90a6e22272 ("drm/i915: Record default HW state in the GPU error
state")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Tested-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20171201001536.13941-1-chris@chris-wilson.co.uk
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

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