From owner-freebsd-current  Fri Oct 12  7:29:19 2001
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Date: Sat, 13 Oct 2001 00:27:58 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Dag-Erling Smorgrav <des@ofug.org>
Cc: Doug Barton <DougB@DougBarton.net>, <freebsd-current@FreeBSD.ORG>
Subject: Re: Strike three, you're out
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On 12 Oct 2001, Dag-Erling Smorgrav wrote:

> Doug Barton <DougB@DougBarton.net> writes:
> > Reported on 9/30:
> > panic: blockable sleep lock (sx) allproc @
> > /usr/local/src/sys/kern/kern_proc.c:212
> >
> > According to BDE, "This is a well-know bug in printf(9).  The TIOCCONS
> > ioctl always gave non-deterministic crashes.  Now it gives determinstic
> > panics when
> > pintf() is called while sched_lock is held." That's the only discussion
> > about it, no fixes, no suggestions.
>
> Remove UCONSOLE from kernel config.  This has been discussed to death
> several times on the lists.

That only prevents non-root from triggering the bug.

What an evil option.  It has always been enabled in GENERIC although it has
always implemented panics and security holes.  It has always been enabled
in LINT/NOTES although it is a negative option.

Bruce


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