linux-ext4 - generic/456 regression on 5.7-rc1, 1k test case

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Message-ID: <20200413201211.wbcotcr6rg523wzs@localhost.localdomain>
Date:   Mon, 13 Apr 2020 16:12:11 -0400
From:   Eric Whitney <enwlinux@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     riteshh@...ux.ibm.com
Subject: generic/456 regression on 5.7-rc1, 1k test case

I'm seeing consistent failures for generic/456 while running kvm-xfstests' 1k
test case on 5.7-rc1.  This is with an x86-64 test appliance root file system
image dated 23 March 2020.

The test fails when e2fsck reports "inconsistent fs: inode 12, i_size is
147456, should be 163840".

Bisecting 5.7-rc1 identified the following patch as the cause:
ext4: don't set dioread_nolock by default for blocksize < pagesize
(626b035b816b).  Reverting the patch in 5.7-rc1 reliably eliminates the test
failure.

Eric