Date: Sun, 14 May 1995 03:33:14 +0300 From: Heikki Suonsivu <hsu@cs.hut.fi> To: Bruce Evans <bde@zeta.org.au> Cc: freebsd-bugs@freefall.cdrom.com, hsu@cs.hut.fi Subject: Re: i386/395: CRITICAL PROBLEM: spl functions implemented incorrectly Message-ID: <199505140033.AA15782@cardhu.cs.hut.fi> In-Reply-To: <199505121955.FAA02157@godzilla.zeta.org.au>
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Bruce Evans writes:
> >s = splsomething();
> >if (foo) {
> > ... something, which does verifyably not modify foo ...
> > if (foo->bar) /* foo is NULL or garbage here, generating kernel
> > page fault. */
> >}
> >splx(s);
> >can't remember which one (there are probably several open ones for me in
> >GNATS, with stack traces and later ones with some kgdb wanderarounds).
> There seems to be only one relevant one:
> >>Synopsis: (apparently) bounce buffer code gets used on 32bit bus
I thought there would be more, but maybe I just didn't send them or they
got lost somewhere...
The FreeBSD 1 "NFS server foo is alive again" problem wasn't reported as PR
but by mail to freebsd-bugs, its old story (but still valid, almost every
time one of the nfs servers panics, the FreeBSD 1 goes with it after the
server comes up).
> > bounce buffer code shouldn't be called in this machine,
> >doesn't it say "enabling bounce buffer code" in boot on those which
> >need it?
> The bt driver always sets SDEV_BOUNCE :-(.
I took the whole thing out to see if it affected the problem. It didn't,
but exchanging the motherboard from P60 to P90 seems to reduce the
frequency of problems.
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
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