Date: Thu, 18 Dec 1997 09:06:05 +1030 From: Mike Smith <mike@smith.net.au> To: "Saad M. Waraich" <Saad.Waraich@Pakistan.NCR.COM> Cc: freebsd-stable@freebsd.org Subject: Re: Panic on stable Message-ID: <199712172236.JAA01729@word.smith.net.au> In-Reply-To: Your message of "Wed, 17 Dec 1997 20:13:47 %2B0500." <199712171513.UAA00838@isb.ncr.com.pk>
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> Hi
> I've 2.2.5-stable for a while now, cvsup'ing every once in a while. No problems
> at all. The machine has continously up for over a year now, barring power
> failures etc.
>
> The machine is a 486/100 NCR Globalyst 525 with an IDE disk, Adaptec 152x SCSI
> card and a Seagate 2 gig scsi disk.
That's a pretty amazing track record for a machine using that disk.
> A short while ago the scsi disk spun down and the machine crashed (rather
> panic'd).
>
> Relevant lines from /var/log/messages follow. Could someone please explain
> them to me.
>
> -------------------------------------------------------------------------
> Dec 17 19:11:48 isb /kernel: aic at line 2404: unexpected busfree phase
The 'aic' driver (the driver for the 152x card) was not expecting the
bus to be free. This is probably due to the disk spinning down.
> Dec 17 19:11:48 isb /kernel: Debugger("aic6360") called.
> Dec 17 19:11:48 isb /kernel: panic: panic for historical reasons
There is no debugger in your system, so the aic driver has paniced. It
is at a complete loss as to what to do at this point.
> Dec 17 19:11:48 isb /kernel:
> Dec 17 19:11:48 isb /kernel: syncing disks...
> Dec 17 19:11:48 isb /kernel:
> Dec 17 19:11:48 isb /kernel: Fatal trap 12: page fault while in kernel mode
The kernel is attempting to flush the cache to disk, but to do that it
needs to use the 'aic' driver which is completely confused, causing a
fatal trap ('system crash').
The 'aic' driver isn't particularly good at handling problems with
disks. If your disk is spinning down, the system is going to follow it.
The solution would be to replace the disk. If it's only a couple of
years old, it may still be under warranty.
mike
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