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Subject: Re: Floating point emulation problem
To: izivkov@yahoo.com (Ivo Zivkov)
Date: Thu, 2 Nov 2000 20:55:33 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20001102192108.85567.qmail@web9904.mail.yahoo.com> from "Ivo Zivkov" at Nov 02, 2000 11:21:08 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> I am running kernel 2.2.5-15. I am trying to calculate sin(0.9), and it crashes on a 386 board with no f/p hardware. The message I get is:
> 
> "Unable to handle kernel paging request at virtual address 7f3c0070......"
> 
> The interesting thing is sin(0.8) works fine. On a Pentium the program executes fine for all values.
> 
> I tried in 2 different 386 boards, and I get the same problem. The program was compiled on R.H.6.0, and "libm" was present on the 386. I even linked the program statically to eliminate any library dependencies. 
> 
> This seems like a common problem, and easy to reproduce. Anybody had the same experience?

Either upgrade to a later 2.2 kernel or rebuild the kernel with gcc 2.7.2.3. Its
a bug in the FPU code when compiled with later compilers

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