Re: Freeze on FPU exception with Athlon

[torvalds@transmeta.com (Linus Torvalds)]

In article <20001118014019.18006.qmail@web3404.mail.yahoo.com>,
=?iso-8859-1?q?Markus=20Schoder?=  <markus_schoder@yahoo.de> wrote:
>The following small program (linked against glibc 2.1.3) reliably
>freezes my system (Athlon Thunderbird CPU) with at least kernels
>2.4.0-test10 and 2.4.0-test11-pre5.  Even the SysRq keys do not work
>after the freeze.
>
>Older kernels (e.g. 2.3.40) seem to work.  Any Ideas?

It certainly doesn't happen for me on any of the machines I work with,
but it wouldn't compile as-is for me, so I exchanged the FPU setting
with a simpler

	asm("fldcw %0": :"m" (0));

which should do the equivalent (ie unmask divide by zero errors). Does
that make a difference for you?

Can you try to figure out where it started happening? Ie try test9 and
back too, to figure out what might be bringing it on... 

I sure as hell hope this isn't an Athlon issue.  Can other people try
the test-program and see if we have a pattern (ie "it happens only on
Athlons", or "Linus is on drugs and it happens for everybody else").

Thanks,

		Linus
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