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From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	linux-mm@kvack.org, linux-next@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [linux-next: Tree for Jun 1] __khugepaged_exit rwsem_down_write_failed lockup
Date: Fri, 3 Jun 2016 22:38:13 +0900	[thread overview]
Message-ID: <20160603133813.GA578@swordfish> (raw)
In-Reply-To: <20160603100505.GE20676@dhcp22.suse.cz>

On (06/03/16 12:05), Michal Hocko wrote:
> > > RIP collect_mm_slot() + 0x42/0x84
> > > 	khugepaged
> > 
> > So is this really collect_mm_slot called directly from khugepaged or is
> > some inlining going on there?

inlining I suppose.

> > > 	prepare_to_wait_event
> > > 	maybe_pmd_mkwrite
> > > 	kthread
> > > 	_raw_sin_unlock_irq
> > > 	ret_from_fork
> > > 	kthread_create_on_node
> > > 
> > > collect_mm_slot() + 0x42/0x84 is
> > 
> > I guess that the problem is that I have missed that __khugepaged_exit
> > doesn't clear the cached khugepaged_scan.mm_slot. Does the following on
> > top fixes that?
> 
> That wouldn't be sufficient after a closer look. We need to do the same
> from khugepaged_scan_mm_slot when atomic_inc_not_zero fails. So I guess
> it would be better to stick it into collect_mm_slot.

Michal, I'll try to test during the weekend (away from the affected box
now), but in the worst case it can as late as next Thursday (gonna travel
next week).

	-ss

  reply	other threads:[~2016-06-03 13:38 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-01  3:11 linux-next: Tree for Jun 1 Stephen Rothwell
2016-06-02  1:48 ` [linux-next: Tree for Jun 1] __khugepaged_exit rwsem_down_write_failed lockup Sergey Senozhatsky
2016-06-02  9:21   ` Michal Hocko
2016-06-02 12:08     ` Sergey Senozhatsky
2016-06-02 12:21       ` Michal Hocko
2016-06-03 13:51         ` Andrea Arcangeli
2016-06-03 14:46           ` Michal Hocko
2016-06-03 15:10             ` Andrea Arcangeli
2016-06-07  7:34               ` Michal Hocko
2016-06-08  8:19               ` Vlastimil Babka
2016-06-03  7:15     ` Sergey Senozhatsky
2016-06-03  7:25       ` Michal Hocko
2016-06-03  8:43         ` Sergey Senozhatsky
2016-06-03  9:55           ` Michal Hocko
2016-06-03 10:05             ` Michal Hocko
2016-06-03 13:38               ` Sergey Senozhatsky [this message]
2016-06-03 13:45                 ` Michal Hocko
2016-06-03 13:49                   ` Michal Hocko
2016-06-04  7:51                     ` Sergey Senozhatsky
2016-06-06  8:39                       ` Michal Hocko
2016-06-02 13:24   ` Vlastimil Babka
2016-06-02 18:58     ` Ebru Akagunduz
2016-06-03  1:00       ` Sergey Senozhatsky
2016-06-03  1:29         ` Sergey Senozhatsky
2016-06-03  4:14           ` Sergey Senozhatsky
2016-06-03 12:28     ` [PATCH] mm, thp: fix locking inconsistency in collapse_huge_page Ebru Akagunduz
2016-06-06 13:05       ` Vlastimil Babka
2016-06-09  3:51         ` Sergey Senozhatsky

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