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Date:      Tue, 10 Oct 1995 22:14:00 -0400
From:      Gene Stark <gene@starkhome.cs.sunysb.edu>
To:        clinet.fi!hsu@sbstark.cs.sunysb.edu
Cc:        freebsd.org!bugs@sbstark.cs.sunysb.edu
Subject:   Re: kern/772: Stable panic
Message-ID:  <199510110214.WAA04016@starkhome.cs.sunysb.edu>
In-Reply-To: <199510110158.DAA03824@katiska.clinet.fi> (message from Heikki Suonsivu on Wed, 11 Oct 1995 03:58:27 %2B0200)

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> > This appears to be the same crash as #744 (which didn't get mailed
> > to the list, for some reason).  I had a crash dump for this, if
> > anyone is interested.  I hope I still have the symbols for that kernel...
>
>We also got this exactly the same situation (page fault in kernel and then
>IO lockup when trying to dump) on a 486-40 with IDE disks, so it is very
>high probability of software problem, not a hardware one.  This is very
>annoying as the systems get stuck, they don't reboot automatically.

The "crash in chflags" problem that I observed occurred with slirp
as the current process.  The system didn't get stuck, it just rebooted
automatically.

I did some tracing on the crash dump, reported what I found in bug report
#744.  I only had an hour or two to spend on it, and I concluded that
the problem was caused by something in the vnode cache/pool code.
Since I have not studied this code, I decided my likelihood of finding
this bug quickly was small, and that David Greenman or John Dyson could
make more efficient use of the dump information.

I don't know if they actually ever saw bug report #744, as at least I
didn't get it mailed back to me via the bugs list.

							- Gene Stark



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