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

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Message-Id: <6085340.JSrffQ0Szo@localhost.localdomain>
Date:   Wed, 04 Jan 2017 11:32:42 +0530
From:   Chandan Rajendra <chandan@...ux.vnet.ibm.com>
To:     Anton Blanchard <anton@...ba.org>
Cc:     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>, axboe@...com,
        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 Wednesday, January 04, 2017 04:18:08 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.

Hi,

The patch at https://patchwork.kernel.org/patch/9488235/ should fix the
bug.

> 
> 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.
> 
> Anton
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-- 
chandan