On 1/14/20 1:25 PM, Christoph Hellwig wrote:
> On Tue, Jan 14, 2020 at 01:17:45PM -0500, Waiman Long wrote:
>> The owner field is just a pointer to the task structure with the lower 3
>> bits served as flag bits. Setting owner to RWSEM_OWNER_UNKNOWN (-2) will
>> stop optimistic spinning. So under what condition did the crash happen?
> When running xfstests with all patches in this series except for this
> one, IIRC in generic/114.

Could you try the attached patch to see if it can fix the problem?

Thanks,
Longman