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Re: xfs_efi_item slab corruption. (v3.9-10936-g51a26ae)

To: Dave Jones <davej@xxxxxxxxxx>
Subject: Re: xfs_efi_item slab corruption. (v3.9-10936-g51a26ae)
From: Mark Tinguely <tinguely@xxxxxxx>
Date: Tue, 07 May 2013 14:58:15 -0500
Cc: CAI Qian <caiqian@xxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130507193146.GA7539@xxxxxxxxxx>
References: <20130507133707.GA18301@xxxxxxxxxx> <51895025.2010709@xxxxxxx> <20130507190731.GA15528@xxxxxxxxxx> <518954DE.4070803@xxxxxxx> <20130507193146.GA7539@xxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:9.0) Gecko/20120122 Thunderbird/9.0
On 05/07/13 14:31, Dave Jones wrote:
On Tue, May 07, 2013 at 02:24:14PM -0500, Mark Tinguely wrote:
  >  On 05/07/13 14:07, Dave Jones wrote:
  >  >  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
  >  >
  >  There was a new patch in the efi/efd code that must be misbehaving.
  >  You are correct, this is not an on-disk value.
  >
  >  I now have poisoning on and I can see this doing a compile like you
  >  suggested. I will ASSERT to see who is doing the decrement after free.

I can hit this almost instantly with fsx. I'll do a bisect, though
it sounds like you already have a suspect.

        Dave


If you want to try kmem debug of Linux 3.8 that would help.

--Mark.




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