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Date: Wed, 4 Jan 2017 16:18:08 +1100
From: Anton Blanchard <anton@samba.org>
To: jack@suse.cz, Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>, axboe@fb.com
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: ext4 filesystem corruption with 4.10-rc2 on ppc64le
Message-ID: <20170104161808.5ad7b4fd@kryten>
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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.

Anton