linux-ext4 - regression in 4.5-rc5

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Message-ID: <20160309221746.GA1763@localhost.localdomain>
Date:	Wed, 9 Mar 2016 17:17:46 -0500
From:	Eric Whitney <enwlinux@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, guaneryu@...il.com
Subject: regression in 4.5-rc5 - generic/324 failure

I'm seeing generic/324 fail consistently when run with xfstest-bld's test
appliance in the 1k block size test case on x86_64.  This happened first on my
4.5-rc5 regression run, and it repeated on -rc6 and -rc7.

Reverting a commit introduced in 4.5-rc5 inhibits the failure:
"ext4: don't read blocks from disk after extents being swapped" (bcff24887d00)

And here's the failed test output:

generic/324 15s ...	[22:10:20][    3.304758] run fstests generic/324 at 2016-03-09 22:10:20
 [22:10:21] [failed, exit status 1] - output mismatch (see /results/results-1k/generic/324.out.bad)
    --- tests/generic/324.out	2015-10-25 10:50:34.000000000 +0000
    +++ /results/results-1k/generic/324.out.bad	2016-03-09 22:10:21.753937505 +0000
    @@ -22,2509 +22,5 @@
     XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
     Before: in_range(10, 40)
     After: in_range(1, -1)
    -Defragment file with 250 * 2 fragments
    -wrote 1234/1234 bytes at offset 0
    -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
    -wrote 1234/1234 bytes at offset 123400
    ...
    (Run 'diff -u tests/generic/324.out /results/results-1k/generic/324.out.bad'  to see the entire diff)
diff: standard output: Broken pipe
Ran: generic/324
Failures: generic/324
Failed 1 of 1 tests

Thanks,
Eric
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