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Subject: kern/37043: Latest stable causes SCSI bus freeze on sym0 when running SMP
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>Number:         37043
>Category:       kern
>Synopsis:       Latest stable causes SCSI bus freeze on sym0 when running SMP
>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 Apr 13 10:30:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Pete French <pfrench@firstcallgroup.co.uk>
>Release:        FreeBSD 4.5-STABLE i386
>Organization:
Seatem UK Limited
>Environment:
System: FreeBSD tixlink1.firstcallgroup.co.uk 4.5-STABLE FreeBSD 4.5-STABLE #0: Fri Apr 12 14:13:48 BST 2002 webadmin@tixlink1.firstcallgroup.co.uk:/usr/obj/usr/src/sys/TIXLINK1 i386

	Machine is a Compaq Proliant server. SMP machine with two 550MHz
	Pentium III processors. Onboard Symbios SCSI controller driving
	a pair of 9.1GB Compaq UW drives. Second SCSI controller attached to
	a tape drive. 256MB of memory, Thunderland 1000MBit ether interface.

>Description:

	After updating to the latest -STABLE (12/04/2002) the machine will
	now freeze giving the error message:

	(noperiph:sym0:0:-1:-1): SCSI BUS reset detected

	It will sometimes then recover from this and continue, but will
	occasionally freeze completely. The machine ran fine on 4.5-STABLE
	froom just fater 4.5-RELEASE, and this has only shown up on the
	latest upgrade.

	The problem appears to be related to heavy disc activity involving
	both drives at once. It also *only* occurs under SMP. Running
	a non SMP kernel solves the problem.

>How-To-Repeat:

	Under my setup I can easly cause this to happen by using two
	copy commands one after the other:

	cp src/cgi-bin/*.exe /usr/local/www/beta/cgi-bin/
	cp src/cgi-bin/*.exe /usr/local/www/live/cgi-bin/

	The second copy command freezes almost instantly. In this case
	the source of the files and the destination are on separate discs.

>Fix:

	The easiest workaround is to run the machine non-SMP. This is
	not acceptable long term, however, and the machine has run happily
	as an SMP box until now.
>Release-Note:
>Audit-Trail:
>Unformatted:

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