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Date: Sat, 11 Mar 1995 10:40:01 -0800
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From: oli@devsoft.com
Reply-To: oli@devsoft.com
To: freebsd-bugs
Subject: kern/238: failed assertion in ncr.c --> no more scsi disk access
In-Reply-To: Your message of Sat, 11 Mar 1995 19:40:12 -0000
	<95Mar11.194021met.7430@devsoft.devsoft.com>
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>Number:         238
>Category:       kern
>Synopsis:       failed assertion in ncr.c --> no more scsi disk access
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs (FreeBSD bugs mailing list)
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Mar 11 10:40:00 1995
>Originator:     Oliver Adler &
>Organization:
no current org
>Release:        FreeBSD 2.0-RELEASE i386 also in current snapshot
>Environment:

	The hardware: ASUS PCI/I-486SP3G
		      Intel 486 DX 4 100
		      32MB Ram 70ns in two sims
		      WD8003EP AT-BUS
		      Adaptec AHA1542CF with disabled Floppy and disabled BIOS
		      ELSA Winner100pro PCI 2MB
		      QUANTUM Empire 2100S  Target 0 on ncr bus
			  "QUANTUM EMPIRE_2100S     1200"
		      WANG DAT 3400 Target 3 on ncr bus
			  "WangDAT Model 3400DX     1.10"

>Description:

	If you try to access /dev/rst0.0 with dd bs=128k if=/dev/rst0.0
	you get on the first access:
Mar 10 09:00:28 boheme kernel: st0: bad request, must be between 0 and 0
        (I think this message doesn't do any harm. It also starts the first
	 access on the adaptec and does no harm there.)
        If you try a second time you get the following:
	 st0:      ncr.c assertion "cp = np->header.cp" line 5171 failed
	 st0:      ncr.c assertion "cp" line 5172 failed
	 .
	 .
	 ncr0:    restart
	 .
	 .
	 sd0: unit attention
	 sd0: oops not qeued
	This sequence repeats 2-times. There is no more recovery of the
	scsi subsytem. No more access to the harddisk. I had to reset.
	Because there is no more disk access I have no exact copy of all kernel
	messages. But I suppose I got the most important messages.

>How-To-Repeat:

	see description above

>Fix:
	
	My only work-around was to put the DAT tape to the scsi Bus of the
	adaptec. Then there is no problem in accessing the DAT after the 
	message 
		st0: bad request, must be between 0 and 0
	I took care of the proper termination in both setups. I also tried 
	the DAT in SCSI1 and SCSI2 mode.

	Sorry that I can't help more. Thank you and the whole FreeBSD team
	for providing us with the very BEST unix available.
	
	Oliver
>Audit-Trail:
>Unformatted: