Re: [Intel-gfx] [PATCH] drm/i915/ttm: Fix illegal addition to shrinker list

Thomas Hellström
2021-11-10T10:31:11Z

On 11/10/21 11:29, Matthew Auld wrote:
> On 10/11/2021 08:55, Thomas Hellström wrote:
>> There's a small window of opportunity during which the adjust_lru()
>> function can be called with a GEM refcount of zero from the TTM
>> eviction code. This results in a kernel BUG().
>>
>> Ensure that we don't attempt to modify the GEM shrinker lists unless
>> we have a GEM refcount.
>>
>> Fixes: ebd4a8ec7799 ("drm/i915/ttm: move shrinker management into
>> adjust_lru")
>> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Reviewed-by: Matthew Auld <matthew.auld@intel.com>

Thanks for reviewing, Matt.

/Thomas