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Date: Mon, 8 Feb 1999 15:48:03 +0100
From: Eivind Eklund <eivind@FreeBSD.ORG>
To: Matthew Jacob <mjacob@feral.com>
Cc: freebsd-alpha@FreeBSD.ORG
Subject: Re: nullfs works?
Message-ID: <19990208154803.B46616@bitbox.follo.net>
References: <Pine.LNX.4.04.9901171605100.11770-100000@feral-gw>
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In-Reply-To: <Pine.LNX.4.04.9901171605100.11770-100000@feral-gw>; from Matthew Jacob on Sun, Jan 17, 1999 at 04:05:30PM -0800
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On Sun, Jan 17, 1999 at 04:05:30PM -0800, Matthew Jacob wrote:
> 
> Jan 17 15:11:23 farrago /kernel: pid 341 (config), uid 31154: exited on
> signal 11 (core dumped)
> 
> fatal kernel trap:
> 
>     trap entry = 0x2 (memory management fault)
>     a0         = 0x60
>     a1         = 0x1
>     a2         = 0x0
>     pc         = 0xfffffc000047fad4
>     ra         = 0xfffffc00003bfc9c
>     curproc    = 0xfffffe00070997e0
>         pid = 554, comm = sh
> 
> ddbprinttrap from 0xfffffc000047fad4
> ddbprinttrap(0x60, 0x1, 0x0, 0x2)
> panic: trap
> panic
> Stopped at      Debugger+0x2c:  ldq     ra,0(sp) <0xfffffe0007165640>
> <ra=0xfffffc00004ac998,sp=0xfffffe0007165640>
> db> t
> Debugger() at Debugger+0x2c
> panic() at panic+0xf8
> trap() at trap+0x69c
> XentMM() at XentMM+0x20
> null_bypass() at null_bypass+0x11c
> (null)() at 0x4

Doesn't look like it works to ME.

It would have been a significant surprise if it worked, too - see
http://www.freebsd.org/~eivind/FixNULL.patch for a start on fixing
this.  (There are some locking issues that I haven't had time to sort
out yet, so that patch will not give you a 100% functional NULLFS.
I'll look at this as soon as my testbox is free again.)

Eivind.

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