<device>: rw=<0|1>, want=<want>, ...

device: rw=0|1, want=want, limit=limit

device

Name of the device on which an erroneous I/O was detected

rw

Type of the I/O. 0=Read/1=Write

want

Size of the requested I/O（in sectors）

limit

Size of the target file(in sectors）

An unreasonable I/O was detected, which attempted to access beyond the end of the target block type device(e.g. hard disk, floppy disk, CD-ROM). The name of the device is displayed with the related information as described in the Arguments section.

In this case, the I/O should be terminated in error. It's possible that the file area information recognized by the file system clashed with the information delivered by the associated device driver.

Since something may be wrong with the file system for the device shown in the message, it's recommended to use fsck to check and repair the file system.

The following message is also displayed before this message:

attempt to access beyond end of device

Refer drivers/block/ll_rw_blk.c #2552for the detail.

md3: rw=0, want=4913837584, limit=1465175040