linux-kernel - Re: EXT4 corruption on Linus latest tree.

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Date:	Thu, 28 Feb 2013 01:07:10 +0800
From:	"gnehzuil.liu" <gnehzuil.liu@...il.com>
To:	Dave Jones <davej@...hat.com>
Cc:	Theodore Ts'o <tytso@....edu>, Borislav Petkov <bp@...en8.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: EXT4 corruption on Linus latest tree.

在 2013-2-28，上午12:56，Dave Jones <davej@...hat.com> 写道：

> On Wed, Feb 27, 2013 at 11:44:17AM -0500, Theodore Ts'o wrote:
>> On Wed, Feb 27, 2013 at 11:04:46AM -0500, Dave Jones wrote:
>>>>> EXT4-fs error (device sdb1): htree_dirblock_to_tree:919: inode #172235804: block 152052301: comm ls: bad entry in directory: rec_len is smaller than minimal - offset=0(0), inode=0, rec_len=0, name_len=0
>>> 
>>> Yeah, looks similar.  The missing files/dirs reappeared when I
>>> booted an older kernel, so it looks like the corruption doesn't
>>> hit the disk.  Fsck (1.42.5) didn't find anything either.
>> 
>> I suspect I see the problem...   can you send me the results of 
>> 
>>  debugfs -R "stat <172235804>" /dev/sdb1
>> 
>> to confirm?
> 
> debugfs 1.42.5 (29-Jul-2012)
> Inode: 172235804   Type: directory    Mode:  0775   Flags: 0x80000
> Generation: 1174354732    Version: 0x00000000:00000055
> User:  1000   Group:  1000   Size: 4096
> File ACL: 0    Directory ACL: 0
> Links: 24   Blockcount: 8
> Fragment:  Address: 0    Number: 0    Size: 0
> ctime: 0x512d0fdc:71fe3000 -- Tue Feb 26 14:41:16 2013
> atime: 0x512d106e:5a143300 -- Tue Feb 26 14:43:42 2013
> mtime: 0x512d0fdc:71fe3000 -- Tue Feb 26 14:41:16 2013
> crtime: 0x50e76c35:1d69aad8 -- Fri Jan  4 18:56:37 2013
> Size of extra inode fields: 28
> Extended attributes stored in inode body: 
>  selinux = "unconfined_u:object_r:file_t:s0\000" (32)
> EXTENTS:
> (0):688923213
> 
> 
> That took about 2 minutes to run btw, expected ?

Hi Dave and Ted,

Thanks for the report.  From the result, I think extent status tree is root cause because of wrong logical-to-physical block mapping.  I am very sorry about that.  I will try to fix the bug ASAP.

Ted, I am not sure whether we need to revert the patch or give me sometimes to fix it.

Thanks!!
                                                - Zheng--
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