i386/185208: (da0:umass-sim0:0:0:0): CAM status: SCSI Status Error

[Pol Hallen]

>Number:         185208
>Category:       i386
>Synopsis:       (da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Dec 26 18:10:01 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Pol Hallen
>Release:        9.2-release
>Organization:
none
>Environment:
FreeBSD dopodiche 9.2-RELEASE-p2 FreeBSD 9.2-RELEASE-p2 #0 r258738M: Thu Dec 12 22:48:00 CET 2013     root at dopodiche:/usr/obj/usr/src/sys/DOPODICHE4  i386

>Description:
I attach an external hd device (2Tb with ext3 fs). I can mount with:

mount -t ext2fs /dev/da0s1/ /path

works

I don't know why and when, I see correct mount point but has not alive, dmesg show me:

(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 00 08 80 00 00 10 00 
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 00 08 80 00 00 10 00 
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
g_vfs_done():da0s1[READ(offset=8192, length=8192)]error = 6

I tested another external usb device (160Gb with ext3 fs) and everything is ok.

Thanks for help
>How-To-Repeat:

>Fix:


>Release-Note:
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