Re: PROBLEM:Illegal instruction when mount nfs file systems using cyr ixIII

From: Mikael Pettersson (
Date: Wed Jun 27 2001 - 15:19:37 EST

On Wed, 27 Jun 2001 17:42:01 +0800, Frank Zhu wrote:

>I use a PIII machine as the server and cyrixIII machine as the client.The
>kernel is 2.4.5.The distribute is red hat 7.1
>when i mount the nfs file system at the client it failed.The core file is
>created.using the gdb it report :
>Program terminated with signal 4(SIGILL),Illegal instruction
>#0 0x40003e28 in ??()
>If i change the cpu (CyrixIII) to PIII all is ok.

You don't say exactly where the failure occurs, but I suspect
that you're feeding i686-class machine code to your VIA Cyrix III.

The problem is that VIA Cyrix III announces itself (via CPUID)
as a "family 6" processor, i.e. i686 compatible. This is not
completely accurate, since it doesn't implement the conditional
move instruction. [Yeah, I know there's a CPUID feature flag for
CMOV. I also know gcc doesn't check it, and I suspect glibc
doesn't either.]

To make the machine work you'll have to ensure that the kernel,
user-space libraries and programs, and NFS-imported programs
all are compiled for a lesser CPU than i686.

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This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:17 EST