Date: Wed, 12 Jul 1995 18:02:05 +0100 (BST) From: Karl Strickland <karl@bagpuss.demon.co.uk> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: bde@freefall.cdrom.com, CVS-commiters@freefall.cdrom.com, cvs-sys@freefall.cdrom.com Subject: Re: cvs commit: src/sys/i386/isa syscons.c syscons.h Message-ID: <199507121702.SAA14679@bagpuss.demon.co.uk> In-Reply-To: <199507111846.LAA16428@gndrsh.aac.dev.com> from "Rodney W. Grimes" at Jul 11, 95 11:46:18 am
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>
> >
> > bde 95/07/11 11:34:31
> >
> > Modified: sys/i386/isa syscons.c syscons.h
> > Log:
> > Fix races in scstart(). q_to_b() wasn't called at spltty(), so there
> > were two races:
> > - q_to_b() might unexpectedly return 0 (e.g, after a keyboard signal
> > flushes the output queue and isn't echoed). ansi_put() interprets
> > 0 bytes as 4GB...
>
> Might this fix the problem that has been reported as ``switching VT's
> at a rate of 1 a second for about 2 to 3 minutes will result in a system
> hang?''
I'm glad to hear I'm not the only one with this problem, I was trying to
track this down the other day - but when it hangs the system, it really
does hang it - I couldnt even prod it by provoking an NMI. I can usually
hang it in a lot less than 2/3 minutes - it seems to happen more often
when you switch away from the X11 screen (I run xdm on startup) - last
time I tried it, it hung first time.
I had this problem under FreeBSD 1.x as well - few weeks ago I switched to
pcvt because of it. I'll try and hang it with these latest fixes...
--
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Mailed using ELM on FreeBSD | Karl Strickland
PGP 2.3a Public Key Available. | Internet: karl@bagpuss.demon.co.uk
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