From owner-freebsd-bugs  Tue May 11 10:28:49 1999
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To: Pierre Beyssac <beyssac@enst.fr>
Cc: freebsd-bugs@freebsd.org, bob@pmr.com,
	FreeBSD-gnats-submit@freebsd.org
Subject: kern/10872: Panic in sorecieve() 
In-reply-to: Your message of "Tue, 11 May 1999 18:59:56 +0200."
             <19990511185956.A12679@enst.fr> 
Date: Wed, 12 May 1999 01:28:42 +0800
From: Peter Wemm <peter@netplex.com.au>
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Pierre Beyssac wrote:
> I was looking into PR kern/10872, hoping to find an easily fixable
> occurence of NULL mbuf pointer. But it doesn't seem to be.

I just looked at the PR.  He's running:

    ahc0: <Adaptec 2940 SCSI adapter> rev 0x00 int a irq 12 on pci0.10.0
    ahc0: aic7870 Single Channel A, SCSI Id=7, 16/255 SCBs
    ncr0: <ncr 53c810 fast10 scsi> rev 0x01 int a irq 11 on pci0.12.0
    ncr1: <ncr 53c875 fast20 wide scsi> rev 0x03 int a irq 9 on pci0.13.0

It should be noted that freefall had a severe case of problems like this
that all but disappeared when the ncr cards were swapped for an ahc2940U2W.

Quite how this should make such a dramatic difference is a bit of a
mystery.  We were seeing really strange things like a bit of the kernel
stack being partly trashed and messing up some local variables..

Cheers,
-Peter



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