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[ 1714.217864] XFS (dm-0): page discard on page 00000000161e11d5, inode 0xd861b703d, offset 937984.
[ 1714.219674] XFS (dm-0): page discard on page 000000001d433e5e, inode 0xd861b703d, offset 942080.
[ 1714.221132] XFS (dm-0): page discard on page 00000000820efe8d, inode 0xd861b703d, offset 946176.
[ 1714.222431] XFS (dm-0): page discard on page 00000000518c8216, inode 0xd861b703d, offset 950272.
[ 1714.223744] XFS (dm-0): page discard on page 00000000753db760, inode 0xd861b703d, offset 954368.
[ 1714.225041] XFS (dm-0): page discard on page 00000000da40787d, inode 0xd861b703d, offset 958464.
[ 1714.226341] XFS (dm-0): page discard on page 00000000ba8adb4b, inode 0xd861b703d, offset 962560.
[ 1714.227629] XFS (dm-0): page discard on page 00000000784c4724, inode 0xd861b703d, offset 966656.
[ 1714.228923] XFS (dm-0): page discard on page 0000000063b2c764, inode 0xd861b703d, offset 970752.
[ 1714.228990] XFS (dm-0): page discard on page 0000000046a36fd8, inode 0xd861b703d, offset 974848.
[ 1714.337426] dm-0: writeback error on inode 58084519997, offset 905216, sector 34365282240
[ 1716.586318] dm-0: writeback error on inode 58084519997, offset 905216, sector 34365309816
[ 1728.444718] xfs_discard_page: 9674 callbacks suppressed

...

[ 1763.990454] XFS (dm-0): xfs_do_force_shutdown(0x8) called from line 955 of file fs/xfs/xfs_trans.c. Return address = 00000000ea9478e4
[ 1763.990459] XFS (dm-0): Corruption of in-memory data detected.  Shutting down filesystem
[ 1763.992696] XFS (dm-0): Please unmount the filesystem and rectify the problem(s)

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~> umount /data
~> xfs_repair /dev/mapper/data

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Phase 1 - find and verify superblock...
        - reporting progress in intervals of 15 minutes
Phase 2 - using internal log
        - zero log...
ERROR: The filesystem has valuable metadata changes in a log which needs to
be replayed.  Mount the filesystem to replay the log, and unmount it before
re-running xfs_repair.  If you are unable to mount the filesystem, then use
the -L option to destroy the log and attempt a repair.
Note that destroying the log may cause corruption 
of the filesystem before doing this.

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~> mount -a
~> umount /data
~> xfs_repair /dev/mapper/data

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Phase 1 - find and verify superblock...
        - reporting progress in intervals of 15 minutes
Phase 2 - using internal log
        - zero log...
        - 19:33:58: zeroing log - 521728 of 521728 blocks done
        - scan filesystem freespace and inode maps...
        - 19:34:11: scanning filesystem freespace - 33 of 33 allocation groups done
        - found root inode chunk
Phase 3 - for each AG...
        - scan and clear agi unlinked lists...
        - 19:34:11: scanning agi unlinked lists - 33 of 33 allocation groups done
        - process known inodes and perform inode discovery...
        - agno = 0
        - agno = 15
        - agno = 30
        ...
        - agno = 27
        - agno = 28
        - agno = 29
        - 19:43:14: process known inodes and inode discovery - 16555072 of 16555072 inodes done
        - process newly discovered inodes...
        - 19:43:14: process newly discovered inodes - 33 of 33 allocation groups done
Phase 4 - check for duplicate blocks...
        - setting up duplicate extent list...
        - 19:43:15: setting up duplicate extent list - 33 of 33 allocation groups done
        - check for inodes claiming duplicate blocks...
        - agno = 7
        - agno = 3
        - agno = 8
        ...
        - agno = 30
        - agno = 31
        - agno = 32
        - 19:43:24: check for inodes claiming duplicate blocks - 16555072 of 16555072 inodes done
Phase 5 - rebuild AG headers and trees...
        - 19:43:27: rebuild AG headers and trees - 33 of 33 allocation groups done
        - reset superblock...
Phase 6 - check inode connectivity...
        - resetting contents of realtime bitmap and summary inodes
        - traversing filesystem ...
        - 19:48:58: rebuild AG headers and trees - 33 of 33 allocation groups done
        - traversal finished ...
        - moving disconnected inodes to lost+found ...
Phase 7 - verify and correct link counts...
        - 19:50:02: verify and correct link counts - 33 of 33 allocation groups done
done