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Re: Bad page state in process 'nfsd' with xfs

To: David Greaves <david@xxxxxxxxxxxx>
Subject: Re: Bad page state in process 'nfsd' with xfs
From: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Date: Sun, 30 Apr 2006 12:06:09 +1000
Cc: "'linux-kernel@xxxxxxxxxxxxxxx'" <linux-kernel@xxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
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David Greaves wrote:
Hash: SHA1

This was with

There's an nfs export from an xfs on an lvm on a raid5 on some
libata/sata disks.
(cc'ing xfs since I recall rumoured(?) badness in old nfs/xfs/md/lvm
setups and xfs_sendfile is mentioned)

dmesg had:

Bad page state in process 'nfsd'
page:b1602060 flags:0x80000008 mapping:00000000 mapcount:0 count:16777216
Trying to fix it up, but a reboot is needed
 [<b013bda2>] bad_page+0x62/0x90
 [<b013c1c8>] prep_new_page+0x78/0x80

Looks like you have a bit flipped in 'count', which was not flipped when the page was last freed. Probably buggy RAM.

Running memtest overnight might confirm that.

SUSE Labs, Novell Inc.
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