XFS corruption detected in xfs_btree_check_sblock() function.

Issue

The XFS filesystem went to read-only mode with following call-trace in messages:

Aug  1 04:41:07 localhost kernel: ffff88013b803000: 49 4e 81 80 02 02 00 00 00 00 00 64 00 00 00 64  IN.........d...d
Aug  1 04:41:07 localhost kernel: XFS (sdd1): Internal error xfs_btree_check_sblock at line 120 of file fs/xfs/xfs_btree.c.  Caller 0xffffffffa023e874
Aug  1 04:41:07 localhost kernel: 
Aug  1 04:41:07 localhost kernel: Pid: 30586, comm: postgres Not tainted 2.6.32-431.el6.x86_64 #1
Aug  1 04:41:07 localhost kernel: Call Trace:
Aug  1 04:41:07 localhost kernel: [<ffffffffa0251e5f>] ? xfs_error_report+0x3f/0x50 [xfs]
Aug  1 04:41:07 localhost kernel: [<ffffffffa023e874>] ? xfs_btree_check_block+0x14/0x30 [xfs]
Aug  1 04:41:07 localhost kernel: [<ffffffffa0251ece>] ? xfs_corruption_error+0x5e/0x90 [xfs]
Aug  1 04:41:07 localhost kernel: [<ffffffffa023e874>] ? xfs_btree_check_block+0x14/0x30 [xfs]
Aug  1 04:41:07 localhost kernel: [<ffffffffa023e7be>] ? xfs_btree_check_sblock+0xbe/0x160 [xfs]