Re: [PATCH] hugetlbfs: fix hugetlb page migration/fault race causing SIGBUS

[Mike Kravetz]

On 8/8/19 12:47 AM, Michal Hocko wrote:
> On Thu 08-08-19 09:46:07, Michal Hocko wrote:
>> On Wed 07-08-19 17:05:33, Mike Kravetz wrote:
>>> Li Wang discovered that LTP/move_page12 V2 sometimes triggers SIGBUS
>>> in the kernel-v5.2.3 testing.  This is caused by a race between hugetlb
>>> page migration and page fault.
<snip>
>>> Reported-by: Li Wang <liwang@xxxxxxxxxx>
>>> Fixes: 290408d4a250 ("hugetlb: hugepage migration core")
>>> Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
>>> Tested-by: Li Wang <liwang@xxxxxxxxxx>
>>
>> Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> 
> Btw. is this worth marking for stable? I haven't seen it triggering
> anywhere but artificial tests. On the other hand the patch is quite
> straightforward so it shouldn't hurt in general.

I don't think this really is material for stable.  I added the tag as the
stable AI logic seems to pick up patches whether marked for stable or not.
For example, here is one I explicitly said did not need to go to stable.

https://lkml.org/lkml/2019/6/1/165

Ironic to find that commit message in a stable backport.

I'm happy to drop the Fixes tag.

Andrew, can you drop the tag?  Or would you like me to resend?
-- 
Mike Kravetz