Date: Tue, 11 May 1999 10:50:03 -0700 (PDT) From: Bob Willcox <bob@luke.pmr.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/10872: Panic in sorecieve() Message-ID: <199905111750.KAA62881@freefall.freebsd.org>
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The following reply was made to PR kern/10872; it has been noted by GNATS.
From: Bob Willcox <bob@luke.pmr.com>
To: Peter Wemm <peter@netplex.com.au>
Cc: freebsd-bugs@freebsd.org, bob@pmr.com,
FreeBSD-gnats-submit@freebsd.org
Subject: Re: kern/10872: Panic in sorecieve()
Date: Tue, 11 May 1999 12:47:07 -0500
On Wed, May 12, 1999 at 01:28:42AM +0800, Peter Wemm wrote:
> 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.
I wish that were so. I wound up replacing the entire system (everything
except the tape library and drive) with one that has 2 ncr adapters in
it (one for the holding disks and the other for the tape library/drive)
and still got the panic.
>
> 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..
This problem seems to be very timing sensative. I will try to recreate
it again here on my -current test system.
Bob
>
> Cheers,
> -Peter
--
Bob Willcox The man who follows the crowd will usually get no
bob@luke.pmr.com further than the crowd. The man who walks alone is
Austin, TX likely to find himself in places no one has ever
been. -- Alan Ashley-Pitt
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