Date: Wed, 24 Apr 1996 15:16:10 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: scrappy@ki.net (Marc G. Fournier) Cc: stable@freebsd.org Subject: Re: 9 makes + 1 caused panic... Message-ID: <199604240546.PAA16508@genesis.atrad.adelaide.edu.au> In-Reply-To: <Pine.NEB.3.93.960424000905.6070A-100000@freebsd.ki.net> from "Marc G. Fournier" at Apr 24, 96 00:28:09 am
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Marc G. Fournier stands accused of saying:
>
> I just started up 9 make processes in /usr/src/lib, and
> had just started up a 10th on /usr/src/gnu/lib when it panic'd.
> I'm using -O2 -m486 -pipe, since someone mentioned that -pipe is
> a *really* good way to brutalize the system...
>
> The panic:
>
> Fatal Trap 12: page fault while in kernel mode
> fault virtual address = 0x700c
> fault code = supervisor write, protection violation
> instruction pointer = 0x8:0xf0106ae1
> current process = 4244 (sh)
> interrupt mask = <there wasn't one??>
> kernel: type 12 trap, code=0
> Stopped at _closef+0x85: decw 0xc(%esi)
Hmm. Looking at closef(), the most likely candidate for this would be
if (--fp->f_count > 0)
return (0);
fp is dereferenced a few lines above, and I can't imagine how the structure
would have become write-protected by accident...
> And, of course, no core dump :(
This one's fairly straightforward.
> Marc G. Fournier scrappy@ki.net
--
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