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 <redacted>
To: Chris Pearson <redacted>
Cc: linux-mm@kvack.org, Andrea Arcangeli <redacted>
Subject: Re: NULL poniter dereference in isolate_lru_pages 2.6.39.1

On Fri, Jul 8, 2011 at 12:53 AM, Chris Pearson [off-list ref] wrote:

quoted

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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