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From: Ross Zwisler <zwisler@gmail.com>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	David Rientjes <rientjes@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Oleg Nesterov <oleg@redhat.com>, Hugh Dickins <hughd@google.com>,
	Andrea Argangeli <andrea@kernel.org>,
	Rik van Riel <riel@redhat.com>,
	linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
	Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper
Date: Thu, 24 Dec 2015 13:39:51 -0700	[thread overview]
Message-ID: <CAOxpaSXxFHSmj6iaTqHTJ0pT_9F4tYnCXFbgnsF9jxeJS1adCw@mail.gmail.com> (raw)
In-Reply-To: <201512242006.CGJ81784.SVMHOOQtLFFFOJ@I-love.SAKURA.ne.jp>

On Thu, Dec 24, 2015 at 4:06 AM, Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
> Michal Hocko wrote:
>> This is VM_BUG_ON_PAGE(page_mapped(page), page), right? Could you attach
>> the full kernel log? It all smells like a race when OOM reaper tears
>> down the mapping and there is a truncate still in progress. But hitting
>> the BUG_ON just because of that doesn't make much sense to me. OOM
>> reaper is essentially MADV_DONTNEED. I have to think about this some
>> more, though, but I am in a holiday mode until early next year so please
>> bear with me.
>
> I don't know whether the OOM killer was invoked just before this
> VM_BUG_ON_PAGE().
>
>> Is this somehow DAX related?
>
> 4.4.0-rc6-next-20151223_new_fsync_v6+ suggests that this kernel
> has "[PATCH v6 0/7] DAX fsync/msync support" applied. But I think
> http://marc.info/?l=linux-mm&m=145068666428057 should be applied
> when retesting. (20151223 does not have this fix.)

No, DAX was not turned on, and while my fsync/msync patches were the initial
reason I was testing (hence the new_fsync_v6 kernel name) they were not
applied during the bisect, so I'm sure they are not related to this issue.

I will retest with the patch referenced above, but it probably won't
happen until
the new year.

WARNING: multiple messages have this Message-ID (diff)
From: Ross Zwisler <zwisler@gmail.com>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	David Rientjes <rientjes@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Oleg Nesterov <oleg@redhat.com>, Hugh Dickins <hughd@google.com>,
	Andrea Argangeli <andrea@kernel.org>,
	Rik van Riel <riel@redhat.com>,
	linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
	Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper
Date: Thu, 24 Dec 2015 13:39:51 -0700	[thread overview]
Message-ID: <CAOxpaSXxFHSmj6iaTqHTJ0pT_9F4tYnCXFbgnsF9jxeJS1adCw@mail.gmail.com> (raw)
In-Reply-To: <201512242006.CGJ81784.SVMHOOQtLFFFOJ@I-love.SAKURA.ne.jp>

On Thu, Dec 24, 2015 at 4:06 AM, Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
> Michal Hocko wrote:
>> This is VM_BUG_ON_PAGE(page_mapped(page), page), right? Could you attach
>> the full kernel log? It all smells like a race when OOM reaper tears
>> down the mapping and there is a truncate still in progress. But hitting
>> the BUG_ON just because of that doesn't make much sense to me. OOM
>> reaper is essentially MADV_DONTNEED. I have to think about this some
>> more, though, but I am in a holiday mode until early next year so please
>> bear with me.
>
> I don't know whether the OOM killer was invoked just before this
> VM_BUG_ON_PAGE().
>
>> Is this somehow DAX related?
>
> 4.4.0-rc6-next-20151223_new_fsync_v6+ suggests that this kernel
> has "[PATCH v6 0/7] DAX fsync/msync support" applied. But I think
> http://marc.info/?l=linux-mm&m=145068666428057 should be applied
> when retesting. (20151223 does not have this fix.)

No, DAX was not turned on, and while my fsync/msync patches were the initial
reason I was testing (hence the new_fsync_v6 kernel name) they were not
applied during the bisect, so I'm sure they are not related to this issue.

I will retest with the patch referenced above, but it probably won't
happen until
the new year.

--
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  reply	other threads:[~2015-12-24 20:56 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-15 18:36 [PATCH 1/2] mm, oom: introduce oom reaper Michal Hocko
2015-12-15 18:36 ` Michal Hocko
2015-12-17  0:50 ` Andrew Morton
2015-12-17  0:50   ` Andrew Morton
2015-12-17 13:02   ` Michal Hocko
2015-12-17 13:02     ` Michal Hocko
2015-12-17 19:55     ` Linus Torvalds
2015-12-17 19:55       ` Linus Torvalds
2015-12-17 20:00       ` Andrew Morton
2015-12-17 20:00         ` Andrew Morton
2015-12-18 11:54         ` Michal Hocko
2015-12-18 11:54           ` Michal Hocko
2015-12-18 21:14           ` Andrew Morton
2015-12-18 21:14             ` Andrew Morton
2015-12-21  8:38             ` Michal Hocko
2015-12-21  8:38               ` Michal Hocko
2015-12-17 21:13     ` Andrew Morton
2015-12-17 21:13       ` Andrew Morton
2015-12-18 12:11       ` Michal Hocko
2015-12-18 12:11         ` Michal Hocko
2015-12-18 12:10     ` Tetsuo Handa
2015-12-18 12:10       ` Tetsuo Handa
2015-12-20  7:14       ` Tetsuo Handa
2015-12-20  7:14         ` Tetsuo Handa
2015-12-18  0:15 ` Andrew Morton
2015-12-18  0:15   ` Andrew Morton
2015-12-18 11:48   ` Michal Hocko
2015-12-18 11:48     ` Michal Hocko
2015-12-21 20:38 ` Paul Gortmaker
2015-12-21 20:38   ` Paul Gortmaker
2016-01-06  9:10   ` Michal Hocko
2016-01-06  9:10     ` Michal Hocko
2016-01-06 14:26     ` Paul Gortmaker
2016-01-06 14:26       ` Paul Gortmaker
2016-01-06 15:00       ` Michal Hocko
2016-01-06 15:00         ` Michal Hocko
2015-12-23 23:00 ` Ross Zwisler
2015-12-23 23:00   ` Ross Zwisler
2015-12-24  9:47   ` Michal Hocko
2015-12-24  9:47     ` Michal Hocko
2015-12-24 11:06     ` Tetsuo Handa
2015-12-24 11:06       ` Tetsuo Handa
2015-12-24 20:39       ` Ross Zwisler [this message]
2015-12-24 20:39         ` Ross Zwisler
2015-12-25 11:41       ` Michal Hocko
2015-12-25 11:41         ` Michal Hocko
2015-12-24 20:44     ` Ross Zwisler
2015-12-24 20:44       ` Ross Zwisler
2015-12-25 11:35       ` Michal Hocko
2015-12-25 11:35         ` Michal Hocko
2015-12-25 11:44         ` Michal Hocko
2015-12-25 11:44           ` Michal Hocko
2016-01-06 15:42 [PATCH 0/2 -mm] oom reaper v4 Michal Hocko
2016-01-06 15:42 ` [PATCH 1/2] mm, oom: introduce oom reaper Michal Hocko
2016-01-06 15:42   ` Michal Hocko
2016-01-07 11:23   ` Tetsuo Handa
2016-01-07 11:23     ` Tetsuo Handa
2016-01-07 12:30     ` Michal Hocko
2016-01-07 12:30       ` Michal Hocko
2016-01-11 22:54   ` Andrew Morton
2016-01-11 22:54     ` Andrew Morton
2016-01-12  8:16     ` Michal Hocko
2016-01-12  8:16       ` Michal Hocko
2016-01-28  1:28   ` David Rientjes
2016-01-28  1:28     ` David Rientjes
2016-01-28 21:42     ` Michal Hocko
2016-01-28 21:42       ` Michal Hocko
2016-02-02  3:02       ` David Rientjes
2016-02-02  3:02         ` David Rientjes
2016-02-02  8:57         ` Michal Hocko
2016-02-02  8:57           ` Michal Hocko
2016-02-02 11:48           ` Tetsuo Handa
2016-02-02 11:48             ` Tetsuo Handa
2016-02-02 22:55             ` David Rientjes
2016-02-02 22:55               ` David Rientjes
2016-02-02 22:51           ` David Rientjes
2016-02-02 22:51             ` David Rientjes
2016-02-03 10:31             ` Tetsuo Handa
2016-02-03 10:31               ` Tetsuo Handa

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