From: Minchan Kim <minchan.kim@gmail.com>
To: Chris Pearson <kermit4@gmail.com>
Cc: linux-mm@kvack.org, Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: NULL poniter dereference in isolate_lru_pages 2.6.39.1
Date: Fri, 8 Jul 2011 14:14:09 +0900 [thread overview]
Message-ID: <CAEwNFnB8VXkTiMzJewtd7rSZ8keqkboNz-BBjw_UudquvsrK1A@mail.gmail.com> (raw)
In-Reply-To: <CAGtzr3fm2=UJFRo2xSYhst0P4jCMT-EPjyPi3=icCrMtW0ij8w@mail.gmail.com>
On Fri, Jul 8, 2011 at 12:53 AM, Chris Pearson <kermit4@gmail.com> wrote:
> see attached screenshots
>
> NULL pointer dereference at 8
>
> isolate_lru_pages
> shrink_inactive_list
> __lookup_tag
> shrink_zone
> shrink_slab
> kswapd
> zone_reclaim
>
> These are from 3 different servers in the past week since we upgraded
> a few hundred of them to 2.6.39.1. They're under a steady few MB/s
> of net and disk I/O load.
>
> We have the following /proc adjustments:
>
> kernel.shmmax = 135217728
> fs.file-max = 65535
> vm.swappiness = 10
> vm.min_free_kbytes = 65535
>
I didn't have see such BUG until now.
Could you tell me which point is isolate_lru_pages + 0x225?
You can get it with addr2line -e vmlinux -i ffffffff8108ed15 or gdb.
The culprit I think is page_count.
A month ago, Andrea pointed out and sent the patch but it seems it
isn't stable tree.
Could you test below patch?
https://patchwork.kernel.org/patch/857442/
--
Kind regards,
Minchan Kim
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next prev parent reply other threads:[~2011-07-08 5:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-07 15:53 Chris Pearson
2011-07-08 5:14 ` Minchan Kim [this message]
2011-07-08 15:39 ` Chris Pearson
2011-07-10 23:05 ` Minchan Kim
2011-07-11 20:52 ` Chris Pearson
2011-07-12 0:16 ` Minchan Kim
2011-07-15 1:48 ` Chris Pearson
2011-07-18 22:48 ` Minchan Kim
2011-07-18 23:18 ` Andrew Morton
2011-07-18 23:32 ` Minchan Kim
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