linux-kernel - Re: ext4 filesystem corruption with 4.10-rc2 on ppc64le

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Message-ID: <ab00525e-50d6-de22-c83c-992985297309@fb.com>
Date:   Wed, 4 Jan 2017 08:09:28 -0700
From:   Jens Axboe <axboe@...com>
To:     Anton Blanchard <anton@...ba.org>, <jack@...e.cz>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Paul Mackerras" <paulus@...ba.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
CC:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: Re: ext4 filesystem corruption with 4.10-rc2 on ppc64le

On 01/03/2017 10:18 PM, Anton Blanchard wrote:
> Hi,
> 
> I'm consistently seeing ext4 filesystem corruption using a mainline
> kernel. It doesn't take much to trigger it - download a ppc64le Ubuntu
> cloud image, boot it in KVM and run:
> 
> sudo apt-get update
> sudo apt-get dist-upgrade
> sudo reboot
> 
> And it never makes it back up, dying with rather severe filesystem
> corruption.
> 
> I've narrowed it down to:
> 
> 64e1c57fa474 ("ext4: Use clean_bdev_aliases() instead of iteration")
> e64855c6cfaa ("fs: Add helper to clean bdev aliases under a bh and use it")
> ce98321bf7d2 ("fs: Remove unmap_underlying_metadata")
> 
> Backing these patches out fixes the issue.

Fix is going out today, I see Chandan already pointed you at it. For the
other reporter, it's not an LE vs BE thing, it's a fs blocksize < page
size problem.

-- 
Jens Axboe