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From: John Baldwin <jhb@freebsd.org>
To: Adrian Chadd <adrian@freebsd.org>
Subject: Re: signal 8 (floating point exception) upon resume
Date: Tue, 4 Mar 2014 11:24:04 -0500
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Cc: freebsd-current <freebsd-current@freebsd.org>,
 Konstantin Belousov <kib@freebsd.org>, Bruce Evans <bde@freebsd.org>,
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On Monday, March 03, 2014 6:49:08 pm Adrian Chadd wrote:
> I'll try this soon.
> 
> I had it fail back to newcons, rather than Xorg normally dying without
> restoring state. It wouldn't let me spawn a shell. Logging in worked
> fine, but normal shell exec would eventually and quickly lead to
> failure, dropping me back to the login prompt.

If you have set CPUTYPE in /etc/src.conf such that your userland binaries
are built with SSE, etc. then I expect most things to break because the FPU
is in a funky state without this patch.  I suspect if you don't set CPUTYPE
so that your userland binaries do not use the FPU, you can probably resume
just fine without this fix.

> -a
> 
> 
> On 3 March 2014 11:11, John Baldwin <jhb@freebsd.org> wrote:
> > On Friday, February 28, 2014 9:00:57 pm Adrian Chadd wrote:
> >> On 28 February 2014 15:35, Adrian Chadd <adrian@freebsd.org> wrote:
> >> > ... how'd this ever work in the past then?
> >> >
> >>
> >> .. and I've submitted it as a PR:
> >>
> >> kern/187152
> >
> > Complete stab in the dark (not compile tested) here:
> >
> > http://www.FreeBSD.org/~jhb/patches/i386_fpu_suspend.patch
> >
> > --
> > John Baldwin
> 

-- 
John Baldwin