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Problem Description
xfstests fails with Metadata corruption at leaf on ext4 filesystem

Kernel Build:  4.12.1-041201-generic
System Name : ltc-test-ci2
Model  : 8247-22L
Platform    :  PowerNV ( P8 )
Issue observed in P9 also.

Uname output
# uname -a
Linux ltc-test-ci2 4.12.1-041201-generic #201707121132 SMP Wed Jul 12 17:03:25 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

Steps to reproduce:
1. Create a loop device with ext4 filesystem
2. git clone git://; cd 
3. make
4. Create a local.config for running with created loop device
5. Run xfstests-dev test  : ./check tests/ext4/445

generic/445      [failed, exit status 1] - output mismatch (see 
    --- tests/generic/445.out   2017-07-13 06:04:36.244322946 -0400
    +++ /root/harish/xfstests-dev/results//generic/445.out.bad  2017-07-14 
02:49:06.540352923 -0400
    @@ -1,2 +1,3 @@
     QA output created by 445
    -Silence is golden
    +seek sanity check failed!
    +(see /root/harish/xfstests-dev/results//generic/445.full for details)
    (Run 'diff -u tests/generic/445.out 
/root/harish/xfstests-dev/results//generic/445.out.bad'  to see the entire diff)

Nothing observed in dmesg.

Full log is attached.

Note: Issue is also observed on distro kernel - 4.11.0-10-generic.

It needs to have two disks you run the test on. Make sure you create
those directories before running the test.

# cat local.config
export TEST_DEV=/dev/loop0
export TEST_DIR=/mnt/test
export SCRATCH_DEV=/dev/loop1
export SCRATCH_MNT=/mnt/scratch

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Tags: architecture-ppc64le bugnameltc-156899 severity-medium 
xfstest sanity checks 17 fails on  data-hole-data inside page
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