linux-kernel - Re: unused swap offset / bad page map.

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Date:	Wed, 21 Aug 2013 16:49:01 -0400
From:	Dave Jones <davej@...hat.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Linux-MM <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: unused swap offset / bad page map.

On Tue, Aug 20, 2013 at 12:39:05PM +0800, Hillf Danton wrote:
 > On Tue, Aug 20, 2013 at 7:18 AM, Dave Jones <davej@...hat.com> wrote:
 > 
 > --- a/mm/memory.c Wed Aug  7 16:29:34 2013
 > +++ b/mm/memory.c Tue Aug 20 11:13:06 2013
 > @@ -933,8 +933,10 @@ again:
 >   if (progress >= 32) {
 >   progress = 0;
 >   if (need_resched() ||
 > -    spin_needbreak(src_ptl) || spin_needbreak(dst_ptl))
 > +    spin_needbreak(src_ptl) || spin_needbreak(dst_ptl)) {
 > +     BUG_ON(entry.val);
 >   break;
 > + }
 >   }
 >   if (pte_none(*src_pte)) {
 >   progress++;

didn't hit the bug_on, but got a bunch of 

[  424.077993] swap_free: Unused swap offset entry 000187d5
[  439.377194] swap_free: Unused swap offset entry 000187e7
[  441.998411] swap_free: Unused swap offset entry 000187ee
[  446.956551] swap_free: Unused swap offset entry 0000245f

	Dave

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