kern/101926: FBSD 6.1-STABLE crashes under heavy disk (ar0) I/O and acces to USB device

O. Hartmann ohartman at mail.uni-mainz.de
Sat Aug 12 16:10:13 UTC 2006


>Number:         101926
>Category:       kern
>Synopsis:       FBSD 6.1-STABLE crashes under heavy disk (ar0) I/O and acces to USB device
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Aug 12 16:10:11 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     O. Hartmann
>Release:        FreeBSD 6.1-STABLE/AMD64
>Organization:
>Environment:
FreeBSD XXX.XXX.XXX.org 6.1-STABLE FreeBSD 6.1-STABLE #27: Sat Aug 12 14:03:42 UTC 2006     root at XXX.XXX.XXX.org:/usr/obj/usr/src/sys/THOR  amd64

>Description:
FreeBSD 6.1-STABLE/AMD64 crashes sporadically under heavy disk I/O when accessing USB device (simply mounting is enough to crash the box). This behaviour has now been watched in several situations on an AMD64 based box, when doing a lot of disk I/O due to torrent sharing or just doing a filesystem check after a crash: box crashes without message when just mounting an USB backup harddrive or after mounting this USB HD and doing then a lot of disk I/O both on the USB device and the main RAID 0 (ar0) of the box.
It is also very suspicious that doing a lot of disk I/O slows the box down just to be unusuable, reacting very, very slow. This occured after swapping the 'old' SATA disks to new Hitachi T7K250 SATA II HDs.
>How-To-Repeat:
Do a lot of disk I/O and then just try to mount an USB HD and do disk I/O to this USB HD while box is still under heavy load. It may lead you into a crash.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:


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