On Mon 21-08-17 09:02:18, Johannes Weiner wrote:
> On Thu, Aug 10, 2017 at 01:56:05PM +0200, Michal Hocko wrote:
> > On Wed 09-08-17 14:38:25, Johannes Weiner wrote:
> > > The issue is that writeback doesn't hold a page reference and the page
> > > might get freed after PG_writeback is cleared (and
On Thu, Aug 10, 2017 at 01:56:05PM +0200, Michal Hocko wrote:
> On Wed 09-08-17 14:38:25, Johannes Weiner wrote:
> > The issue is that writeback doesn't hold a page reference and the page
> > might get freed after PG_writeback is cleared (and the mapping is
> > unlocked) in test_clear_page_writebac
Hi Johannes,
On 08/09, Johannes Weiner wrote:
> On Tue, Aug 08, 2017 at 10:39:27PM -0400, Brad Bolen wrote:
> > Yes, the BUG_ON(!page_count(page)) fired for me as well.
>
> Brad, Jaegeuk, does the following patch address this problem?
I also confirmed that this patch addresses the problem.
Test
Johannes,
Yes, the patch (slightly modified to apply for 4.11) does make my problem
go away. Thank you for driving this to a solution.
Brad
On Wed, Aug 9, 2017 at 2:38 PM, Johannes Weiner wrote:
> On Tue, Aug 08, 2017 at 10:39:27PM -0400, Brad Bolen wrote:
>> Yes, the BUG_ON(!page_count(page))
On Wed 09-08-17 14:38:25, Johannes Weiner wrote:
> On Tue, Aug 08, 2017 at 10:39:27PM -0400, Brad Bolen wrote:
> > Yes, the BUG_ON(!page_count(page)) fired for me as well.
>
> Brad, Jaegeuk, does the following patch address this problem?
>
> ---
>
> >From cf0060892eb70bccbc8cedeac0a5756c8f7b975e
On Tue, Aug 08, 2017 at 10:39:27PM -0400, Brad Bolen wrote:
> Yes, the BUG_ON(!page_count(page)) fired for me as well.
Brad, Jaegeuk, does the following patch address this problem?
---
>From cf0060892eb70bccbc8cedeac0a5756c8f7b975e Mon Sep 17 00:00:00 2001
From: Johannes Weiner
Date: Wed, 9 Aug
Yes, the BUG_ON(!page_count(page)) fired for me as well.
On Tue, Aug 8, 2017 at 9:44 PM, Jaegeuk Kim wrote:
> On 08/08, Johannes Weiner wrote:
>> On Tue, Aug 08, 2017 at 03:13:42PM -0400, Brad Bolen wrote:
>> > On Tue, Aug 8, 2017 at 1:37 PM, Johannes Weiner wrote:
>> > > On Tue, Aug 08, 2017 at
On 08/08, Johannes Weiner wrote:
> On Tue, Aug 08, 2017 at 03:13:42PM -0400, Brad Bolen wrote:
> > On Tue, Aug 8, 2017 at 1:37 PM, Johannes Weiner wrote:
> > > On Tue, Aug 08, 2017 at 09:56:01AM -0700, Jaegeuk Kim wrote:
> > >> On 08/08, Johannes Weiner wrote:
> > >> > Hi Jaegeuk and Bradley,
> >
On Tue, Aug 08, 2017 at 03:13:42PM -0400, Brad Bolen wrote:
> On Tue, Aug 8, 2017 at 1:37 PM, Johannes Weiner wrote:
> > On Tue, Aug 08, 2017 at 09:56:01AM -0700, Jaegeuk Kim wrote:
> >> On 08/08, Johannes Weiner wrote:
> >> > Hi Jaegeuk and Bradley,
> >> >
> >> > On Mon, Aug 07, 2017 at 09:01:50P
On Tue, Aug 8, 2017 at 1:37 PM, Johannes Weiner wrote:
> On Tue, Aug 08, 2017 at 09:56:01AM -0700, Jaegeuk Kim wrote:
>> On 08/08, Johannes Weiner wrote:
>> > Hi Jaegeuk and Bradley,
>> >
>> > On Mon, Aug 07, 2017 at 09:01:50PM -0400, Bradley Bolen wrote:
>> > > I am getting a very similar error o
On Tue, Aug 08, 2017 at 09:56:01AM -0700, Jaegeuk Kim wrote:
> On 08/08, Johannes Weiner wrote:
> > Hi Jaegeuk and Bradley,
> >
> > On Mon, Aug 07, 2017 at 09:01:50PM -0400, Bradley Bolen wrote:
> > > I am getting a very similar error on v4.11 with an arm64 board.
> > >
> > > I, too, also see pag
On 08/08, Johannes Weiner wrote:
> Hi Jaegeuk and Bradley,
>
> On Mon, Aug 07, 2017 at 09:01:50PM -0400, Bradley Bolen wrote:
> > I am getting a very similar error on v4.11 with an arm64 board.
> >
> > I, too, also see page->mem_cgroup checked to make sure that it is not
> > NULL and then several
Hi Jaegeuk and Bradley,
On Mon, Aug 07, 2017 at 09:01:50PM -0400, Bradley Bolen wrote:
> I am getting a very similar error on v4.11 with an arm64 board.
>
> I, too, also see page->mem_cgroup checked to make sure that it is not
> NULL and then several instructions later it is NULL. It does appear
Hi Johannes,
Can I ask your help about the below panic which is annoying me recently.
I'm currently testing xfstests with 4.13-rc2, and have hit the below panic
very randomly.
[ 3722.366490] BUG: unable to handle kernel NULL pointer dereference at
03b0
[ 3722.378815] IP: test_clear_p
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