Re: [linux-next: Tree for Jun 1] __khugepaged_exit rwsem_down_write_failed lockup
From: Sergey Senozhatsky
Date: Fri Jun 03 2016 - 03:16:02 EST
On (06/02/16 11:21), Michal Hocko wrote:
> @@ -2863,6 +2854,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
> + mmput(mm);
> return progress;
this possibly sleeping mmput() is called from
under the spin_lock(&khugepaged_mm_lock).
there is also a trivial build fixup needed
(move collect_mm_slot() before __khugepaged_exit()).
it's quite hard to trigger the bug (somehow), so I can't
follow up with more information as of now.