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Date:      Thu, 24 Jun 1999 10:03:40 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Terry Glanfield <terry@program-products.co.uk>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Multiple panics in ufs_vnoperate (3.2-STABLE)
Message-ID:  <19990624100339.F417@freebie.lemis.com>
In-Reply-To: <9906231415.AA16160@program-products.co.uk>; from Terry Glanfield on Wed, Jun 23, 1999 at 03:15:58PM %2B0100
References:  <9906231415.AA16160@program-products.co.uk>

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On Wednesday, 23 June 1999 at 15:15:58 +0100, Terry Glanfield wrote:
>
> Hi,
>
> One of my boxes is panicing every 2 or 3 days in ufs_vnoperate running
> 3.2-STABLE of Jun 9th.  Other boxes are perfectly stable which
> indicates flakey hardware.  Can anyone suggest likely hardware
> failures and a good order for replacing components? 

No.

This doesn't look like a hardware problem.  It always happens in
pretty much the same place.

> Three kernel back traces are appended.

Do you still have the dumps?  The obvious thing to do here is to look
at what's going on there.  A "page fault" under these circumstances
suggests an uninitialized pointer (the fault address is 0x0 in one
case and 0x63746572 in the other; the latter is interesting because it
is the text "retc").

The first thing you want to do is look at the stack frame where the
problem occurred.  Do this:

  (kgdb) f 5
  (kgdb) p *ap

This will be an iterative effort; it'll take a while to find it, but
I'd guess you have a corrupted file on disk.

Greg
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