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Date: Tue, 7 May 2013 15:07:31 -0400
From: Dave Jones <davej@redhat.com>
Subject: Re: xfs_efi_item slab corruption. (v3.9-10936-g51a26ae)
Message-ID: <20130507190731.GA15528@redhat.com>
References: <20130507133707.GA18301@redhat.com>
 <51895025.2010709@sgi.com>
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To: Mark Tinguely <tinguely@sgi.com>
Cc: CAI Qian <caiqian@redhat.com>, xfs@oss.sgi.com

On Tue, May 07, 2013 at 02:04:05PM -0500, Mark Tinguely wrote:
 > On 05/07/13 08:37, Dave Jones wrote:
 > >    172.233570] Bytes b4 ffff8800aaac4e28: 07 a2 fd ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a  ........ZZZZZZZZ
 > > [  172.233573] Object ffff8800aaac4e38: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233575] Object ffff8800aaac4e48: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233577] Object ffff8800aaac4e58: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233579] Object ffff8800aaac4e68: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233581] Object ffff8800aaac4e78: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233583] Object ffff8800aaac4e88: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233586] Object ffff8800aaac4e98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
 > > [  172.233588] Object ffff8800aaac4ea8: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  jkkkkkkkkkkkkkkk
 >                                            ^^
 > 
 > xfs_efi_log_item.efi_refcount being decremented on the xfs_efi_release()
 > CAI Qian had the same thing in his May 6 "3.9.0: XFS rootfs corruption" 
 > email.
 > 
 > I have not reproduced it yet.

I've hit it on two different machines today. The good news is that the
corruption never makes it onto disk. xfs_repair doesn't pick up anything.

	Dave

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