[754] in linux-scsi channel archive
Re: Segment violations during disk access
daemon@ATHENA.MIT.EDU (R. Larry Arbanas)
Fri Nov 3 17:51:17 1995
From: "R. Larry Arbanas" <arbanas@bovaris.northville.mi.us>
To: louis@sacc.wn.apc.org, linux-scsi@vger.rutgers.edu
Date: Fri, 3 Nov 1995 07:14:34 -0500 (EST)
Cc: arbanas@bovaris.northville.mi.us (R. Larry Arbanas)
In-Reply-To: <Pine.LNX.3.91.951102112008.2012B-100000@khotso.sacc.wn.apc.org> from "Louis Mandelstam" at Nov 2, 95 11:36:03 am
>
> Good day -
>
> I've been experiencing a problem with the SCSI subsystem on a 1.2.13
> machine, with disk accesses sometimes causing the calling process to
> crash, occasionally taking the system with it.
>
> One sure way the get the problem to show itself is to do a badblocks
> /dev/sda1 <blocksondisk> - badblocks almost always dies with a 'Segment
> violation' before completion.
Sounds similar to my situation. When I generate significant amounts of scsi bus
traffic, Linux will dump a copy of the CPU registers, and sometimes
hang.
The only thing that I have found to effect the problem is opening
the CPU case and point a large oscillating desk fan at the inside
of the computer. Cooling it seems to help. Processor is a 486-33 with
no heat sink in a magitronic VLB motherboard.
Does anyone have any comments on this behavior?
> I've tried replacing the hard disk (a Conner 1080S) with a Seagate
> Baracudda which is known to work fine, and the problem persisted. I've
> also taken out all other SCSI devices and the problem wasn't affected.
> I've also tried going to single user and running badblocks without any
> other processes possibly accessing the disk, without any change.
yep, I have tried different scsi cards (though similar models adaptec
aha-154xb) and have seen the problem with scsi disks (Conner 30540)
and tape drives (hp c1533a, Viper 2150s). The problem remains.
>
> I have not been able to try a different SCSI adapter as yet. One warning
> which I have been wondering about is the output fdisk gives me when I run it:
> 'The number of cylinders for this disk is set to 1030.
> This is larger than 1024, and may cause problems with some software.'
I don't get this message, it may be independent of your main problem...
[... stuff deleted]
> Regards
>
> ----------------------------------------------------------------------
> L.Mandelstam - System Administrator louis@sacc.wn.apc.org
> S A Council of Churches, PO Box 4921, Johannesburg, 2000, South Africa
> tel:+27-11-492-1380 x249 fax:+27-11-492-1448
> ----------------------------------------------------------------------
Let me know if you get other suggestions for this problem, or if you
try my fan test. I have been messing with this problem for about
six months!
--
R. Larry Arbanas | Backups? We doan *NEED*
arbanas@bovaris.northville.mi.us | no steenking baX%^~,VbKx NO CARRIER
