"Illegal instruction" traps on smp clients - 2.4.19
klink at arlut.utexas.edu
Fri Feb 28 01:44:46 EST 2003
This is a message that was posted last week on linux-smp.
No responses, so I'm rewriting/reposting here.
Our configuration uses Linux 2.4.19, from Synergy ( derived
from YellowDog version 2.1). We have several boards
configd in a server/client relationship. These boards
contain either 2 or 4 G4 Altived ppc processors. The
server has an attached disk, clients are diskless, mounting
their root file system over nfs.
I am seeing frequent "Illegal instruction" traps on clients
that run an smp kernel. Other symptoms include failure of
various daemons during startup ( syslogd, crond, sshd, etc ).
Symptoms also occur during rsh/rlogin usage.
Running a UP kernel on clients works just fine.
Smp and UP kernels work fine on the "server".
Has anyone else seen this type of problem or something similar?
This appears to me to be an smp problem.
A fix relating to page table/tlb invalidation ordering
was detailed by Sunil Saxena at
for the x86 architecture, and these mods seem to have made it
into 2.4.18 . The ppc arch was not addressed. Also have
noticed this problem being addressed starting in 2.5.16 .
Its not really practical for me to use 2.5.xx at this point.
I am hoping that someone familiar with this code and the
ppc architecture can verify that this is indeed a problem
And then, what can I do about it? I'm willing to try things
as my time permits. I have looked at 2.5.60 memory.c/mmap.c
and related functions, and trying to port the new methods
back to 2.4.19 seems to be a rather daunting task.
My background involves writing device drivers for VMS,
Solaris, and now Linux.
Any assistance or guidance would be appreciated
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