[    5.024330] blkfront: xvda1: barrier or flush: disabled
[    5.024338] end_request: I/O error, dev xvda1, sector 4196916
[    5.024343] end_request: I/O error, dev xvda1, sector 4196916
[    5.024360] XFS (xvda1): metadata I/O error: block 0x400a34 ("xlog_iodone") error 5 buf count 3072
[    5.024369] XFS (xvda1): xfs_do_force_shutdown(0x2) called from line 1007 of file /build/linux-s5x2oE/linux-3.2.46/fs/xfs/xfs_log.c.  Return address = 0xffffffffa009fed5
[    5.024394] XFS (xvda1): Log I/O Error Detected.  Shutting down filesystem
[    5.024401] XFS (xvda1): Please umount the filesystem and rectify the problem(s)
[    5.024411] XFS (xvda1): xfs_log_force: error 5 returned.
[    5.024419] XFS (xvda1): xfs_do_force_shutdown(0x1) called from line 1033 of file /build/linux-s5x2oE/linux-3.2.46/fs/xfs/xfs_buf.c.  Return address = 0xffffffffa005f8a7