linux-ext4 - generic/347 data=journal regression in 4.17

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Message-ID: <20180615154546.oemmhwlweadtstsd@localhost.localdomain>
Date:   Fri, 15 Jun 2018 11:45:46 -0400
From:   Eric Whitney <enwlinux@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu
Subject: generic/347 data=journal regression in 4.17

As discussed in this week's ext4 concall, I'm seeing a regression for
generic/347 in the data=journal test case when running xfstests-bld on
4.17.  The test fails with the following output:

    QA output created by 347
    +/sbin/e2fsck: Unknown code ____ 251 while recovering journal of /dev/mapper/thin-vol

The failure bisects to:

errseq: Always report a writeback error once (b4678df184b3)

This patch landed in v4.17-rc4.  When it's reverted in v4.17, it's no longer
possible to reproduce the error.

Thanks,
Eric