linux-ext4 - Re: xattr hash error in 4.13-rc with overlayfs over ext4

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Date:   Thu, 27 Jul 2017 21:28:59 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Tahsin Erdogan <tahsin@...gle.com>
Cc:     "Theodore Ts'o" <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        "linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>
Subject: Re: xattr hash error in 4.13-rc with overlayfs over ext4

On Thu, Jul 27, 2017 at 8:20 PM, Tahsin Erdogan <tahsin@...gle.com> wrote:
> Hi Miklos,
> I made a first attempt to reproduce the failure but did not get lucky.
>
>> Inode 3093, i_blocks is 16, should be 8.  Fix<y>? yes
> Does this inode correspond to foo, bar or a preexisting file?
>
> Do you mind sharing the output of the following command?
> debugfs -R "stat <3093>" /dev/${ext4_dev}

Inode: 17093   Type: regular    Mode:  0644   Flags: 0x80000
Generation: 2184376062    Version: 0x00000000:00000001
User:     0   Group:     0   Project:     0   Size: 8
File ACL: 65561    Directory ACL: 0
Links: 2   Blockcount: 16
Fragment:  Address: 0    Number: 0    Size: 0
 ctime: 0x597a3e23:7d3fc138 -- Thu Jul 27 19:25:23 2017
 atime: 0x597a3dfc:a80bc138 -- Thu Jul 27 19:24:44 2017
 mtime: 0x597a3e23:7d3fc138 -- Thu Jul 27 19:25:23 2017
crtime: 0x597a3e23:787b0938 -- Thu Jul 27 19:25:23 2017
Size of extra inode fields: 32
EXTENTS:
(0):142340

Resulting fsck output:

Pass 1: Checking inodes, blocks, and sizes
Extended attribute in inode 17093 has a hash (2257320705) which is invalid
Clear<y>? yes
Inode 17093, i_blocks is 16, should be 8.  Fix<y>? yes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -65561
Fix<y>? yes
Free blocks count wrong for group #2 (13797, counted=13798).
Fix<y>? yes
Free blocks count wrong (86361, counted=86362).
Fix<y>? yes