From: Dave Jones <davej@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Sami Liedes <sami.liedes@iki.fi>,
linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org
Subject: Re: [Bug 43227] New: BUG: Bad page state in process wcg_gfam_6.11_i
Date: Fri, 11 May 2012 16:59:13 -0400 [thread overview]
Message-ID: <20120511205913.GA15539@redhat.com> (raw)
In-Reply-To: <20120511133234.6130b69a.akpm@linux-foundation.org>
On Fri, May 11, 2012 at 01:32:34PM -0700, Andrew Morton wrote:
> On Fri, 11 May 2012 23:02:13 +0300
> Sami Liedes <sami.liedes@iki.fi> wrote:
>
> > On Fri, May 11, 2012 at 12:59:21PM -0700, Andrew Morton wrote:
> > > > [67031.755786] BUG: Bad page state in process wcg_gfam_6.11_i pfn:02519
> > > > [67031.755790] page:ffffea0000094640 count:0 mapcount:0 mapping:
> > > > (null) index:0x7f1eb293b
> > > > [67031.755792] page flags: 0x4000000000000014(referenced|dirty)
> > >
> > > AFAICT we got this warning because the page allocator found a free page
> > > with PG_referenced and PG_dirty set.
> > >
> > > It would be a heck of a lot more useful if we'd been told about this
> > > when the page was freed, not when it was reused! Can anyone think of a
> > > reason why PAGE_FLAGS_CHECK_AT_FREE doesn't include these flags (at
> > > least)?
> >
> > Would it be useful if I tried to reproduce this with some debugging
> > options turned on, for example CONFIG_DEBUG_VM?
> >
>
> Sure, thanks, that might turn something up.
> Documentation/SubmitChecklist recommends
>
> : 12: Has been tested with CONFIG_PREEMPT, CONFIG_DEBUG_PREEMPT,
> : CONFIG_DEBUG_SLAB, CONFIG_DEBUG_PAGEALLOC, CONFIG_DEBUG_MUTEXES,
> : CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_ATOMIC_SLEEP, CONFIG_PROVE_RCU
> : and CONFIG_DEBUG_OBJECTS_RCU_HEAD all simultaneously enabled.
>
> although that list might be a bit out of date; it certainly should
> include CONFIG_DEBUG_VM!
FWIW, that Fedora report of this had DEBUG_VM enabled, and it doesn't
seem that there was any earlier oops/warn judging by the lack of tainting.
Dave
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next prev parent reply other threads:[~2012-05-11 20:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-43227-27@https.bugzilla.kernel.org/>
2012-05-11 19:59 ` [Bug 43227] New: BUG: Bad page state in process wcg_gfam_6.11_i Andrew Morton
2012-05-11 20:02 ` Sami Liedes
2012-05-11 20:32 ` Andrew Morton
2012-05-11 20:59 ` Dave Jones [this message]
2012-05-11 22:23 ` Sami Liedes
2012-05-14 0:25 ` Dave Jones
2012-05-11 20:06 ` Dave Jones
2012-05-11 20:10 ` Andrew Morton
2012-05-11 22:14 ` Sami Liedes
2012-05-11 21:30 ` Hugh Dickins
2012-05-11 22:56 ` Sami Liedes
2012-05-14 0:30 ` Dave Jones
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