Re: [PATCH v2 1/7] mm/compaction: split freepages without holding the zone lock

[Sasha Levin]

On 06/14/2016 01:52 AM, Joonsoo Kim wrote:
> On Mon, Jun 13, 2016 at 04:31:15PM -0400, Sasha Levin wrote:
>> > On 05/25/2016 10:37 PM, js1304@xxxxxxxxx wrote:
>>> > > From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>>> > > 
>>> > > We don't need to split freepages with holding the zone lock. It will cause
>>> > > more contention on zone lock so not desirable.
>>> > > 
>>> > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>> > 
>> > Hey Joonsoo,
> Hello, Sasha.
>> > 
>> > I'm seeing the following corruption/crash which seems to be related to
>> > this patch:
> Could you tell me why you think that following corruption is related
> to this patch? list_del() in __isolate_free_page() is unchanged part.
> 
> Before this patch, we did it by split_free_page() ->
> __isolate_free_page() -> list_del(). With this patch, we do it by
> calling __isolate_free_page() directly.

I haven't bisected it, but it's the first time I see this issue and this
commit seems to have done related changes that might cause this.

I can go ahead with bisection if you don't think it's related.


Thanks,
Sasha