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

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Message-ID: <CAOQ4uxjtLVuuYyDZ7csJeb_xbMiWHDHs21tgQoB7bbLWC6DUew@mail.gmail.com>
Date:   Tue, 1 Aug 2017 13:34:34 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Tahsin Erdogan <tahsin@...gle.com>,
        "Theodore Ts'o" <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        linux-fsdevel <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 Mon, Jul 31, 2017 at 7:08 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> On Thu, Jul 27, 2017 at 10:54 PM, Tahsin Erdogan <tahsin@...gle.com> wrote:
>> Still no luck reproducing the error. I am using the test script below
>> at v4.13-rc2. Do you mind checking my script to see what I am missing?
>
> Don't know.   I can reliably reproduce it under UML, but not with a
> VM.  What the hell is going on?
>

Is it the same ext4 image for UML and VM? same image size? same mkfs version?

What inode size do you have in UML setup? e.g.:

dumpe2fs -h /dev/sda3|grep Inode.size
dumpe2fs 1.42.13 (17-May-2015)
Inode size:          256

have extra_isize feature? (not sure if that matters)

dumpe2fs -h /dev/sda3|grep isize
dumpe2fs 1.42.13 (17-May-2015)
Filesystem features:      has_journal ext_attr resize_inode dir_index
filetype needs_recovery extent flex_bg sparse_super large_file
huge_file uninit_bg dir_nlink extra_isize
Required extra isize:     28
Desired extra isize:      28