Re: NULL poniter dereference in isolate_lru_pages 2.6.39.1

[Chris Pearson <pearson.christopher.j@gmail.com>]

addr1line says vmscan.c:0

I must have not compiled with some debugging info?

On Fri, 8 Jul 2011, Minchan Kim wrote:

>Date: Fri, 8 Jul 2011 14:14:09 +0900
>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
>
>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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