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Is it possible the check an frozen XFS filesytem to avoid downtime

To: xfs@xxxxxxxxxxx
Subject: Is it possible the check an frozen XFS filesytem to avoid downtime
From: Martin Steigerwald <ms@xxxxxxxxx>
Date: Mon, 14 Jul 2008 15:42:51 +0200
Organization: team(ix) GmbH
Sender: xfs-bounce@xxxxxxxxxxx
User-agent: KMail/1.9.9
Hi!

We seen in-memory corruption on two XFS filesystem on a server heartbeat 
cluster of one of our customers:


XFS internal error XFS_WANT_CORRUPTED_GOTO at line 1563 of file 
fs/xfs/xfs_alloc.c.  Caller 0xffffffff8824eb5d

Call Trace:
 [<ffffffff8824cff3>] :xfs:xfs_free_ag_extent+0x1a6/0x6b5
 [<ffffffff8824eb5d>] :xfs:xfs_free_extent+0xa9/0xc9
 [<ffffffff88258636>] :xfs:xfs_bmap_finish+0xf0/0x169
 [<ffffffff88278b4c>] :xfs:xfs_itruncate_finish+0x180/0x2c1
 [<ffffffff8829071a>] :xfs:xfs_setattr+0x841/0xe59
 [<ffffffff8022e868>] sock_common_recvmsg+0x30/0x45
 [<ffffffff8829adc8>] :xfs:xfs_vn_setattr+0x121/0x144
 [<ffffffff8022a06d>] notify_change+0x156/0x2ef
 [<ffffffff883bf9c6>] :nfsd:nfsd_setattr+0x334/0x4b1
 [<ffffffff883c61d6>] :nfsd:nfsd3_proc_setattr+0xa2/0xae
 [<ffffffff883bb24d>] :nfsd:nfsd_dispatch+0xdd/0x19e
 [<ffffffff8833a10e>] :sunrpc:svc_process+0x3cb/0x6d9
 [<ffffffff8025b20b>] __down_read+0x12/0x9a
 [<ffffffff883bb816>] :nfsd:nfsd+0x192/0x2b0
 [<ffffffff80255f38>] child_rip+0xa/0x12
 [<ffffffff883bb684>] :nfsd:nfsd+0x0/0x2b0
 [<ffffffff80255f2e>] child_rip+0x0/0x12

xfs_force_shutdown(dm-1,0x8) called from line 4261 of file fs/xfs/xfs_bmap.c.  
Return address = 0xffffffff88258673
Filesystem "dm-1": Corruption of in-memory data detected.  Shutting down 
filesystem: dm-1
Please umount the filesystem, and rectify the problem(s)

on

Linux version 2.6.21-1-amd64 (Debian 2.6.21-4~bpo.1) (nobse@xxxxxxxxxxxxx) 
(gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #1 SMP Tue Jun 5 
07:43:32 UTC 2007


We plan to do a takeover so that the server which appears to have memory 
errors can be memtested. 

After the takeover we would like to make sure that the XFS filesystems are 
intact. Is it possible to do so without taking the filesystem completely 
offline?

I thought about mounting read only and it might be the best choice available, 
but then it will *fail* write accesses. I would prefer if these are just 
stalled.

I tried xfs_freeze -f on my laptop home directory, but then did not machine to 
get it check via xfs_check or xfs_repair -nd... is it possible at all?

Ciao,
-- 
Martin Steigerwald - team(ix) GmbH - http://www.teamix.de
gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90


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