Cpu panic random

Cpu panic random

Post by Snip3 » Tue, 08 Jul 2003 22:40:24


on a ds20e (tru64 5.1)sometimes i have a random cpu panic
every 2 or 3 month),and the system go in halt.

In the crash.data i can read this line:

_panic_string:  0xfffffc0000aec948 = "kn600_softerr_intr():
 Correctable Errors not supported on EV6 pass 1\n"

These are the two cpu installed:

 CPU Type Speed (Mhz)

 0 EV6 (21264) 667
 1 EV6.7 (21264A) 667

The firmware is:
Firmware revision: 5.8-10
PALcode: UNIX version 1.79-63

As you can see the secondary cpu is different from the primary cpu,
ca be this the cause ?

Thanks, i will summarize.



Cpu panic random

Post by Islan » Wed, 09 Jul 2003 02:34:19

That is definitely the problem
I bet the EV6 cpu is ACTUALLY 500Mhz overclocked



Cpu panic random

Post by Peter da Sil » Wed, 09 Jul 2003 04:22:18

> on a ds20e (tru64 5.1)sometimes i have a random cpu panic
> every 2 or 3 month),and the system go in halt.


Quote:>  0 EV6 (21264) 667
>  1 EV6.7 (21264A) 667

In general it is considered a bit dodgy to run different CPUs together
in a SMP environment. It sounds like the kernel is either going "21264,
OK, we'll set up to handle X and Y" and getting "Z" from the 21264A, or
it's going "21264A, eh? We'll do X, Y, and Z" and freaking out when "Z"
doesn't work on the 21264.

I've seen things you people can't imagine. Chimneysweeps on fire over the roofs
of London. I've watched kite-strings glitter in the sun at Hyde Park Gate.  All
these things will be lost in time, like chalk-paintings in the rain.   `-_-'
Time for your nap.  | Peter da Silva | Har du kramat din varg, idag?    'U`


1. Kernel panic with Cyrix Cx486 S25 CPU (similar to U5 CPU panic)

He resolved his problem by installing an Intel CPU.

I have a Cyrix Cx486 S25 FasCache (Cx486S-25GP) processor that fails in
the same way.  The messages are:
   math_emulate: 0010:0010ebb4
   Kernel panic: Math emulation required in kernel
   In swapper task - not syncing

The kernel should have math emulation support.  It's the same kernel that
I use on a AMD 386SX/25.  I've also tried the boot/root image diskettes--
similar results.  I'm running Linux 1.0.8.

Any ideas?  TIA.

2. 1516 read per second - isnt it high enough to staurate scsi?

3. This is disconcerting: System panic: panic (cpu 0): Processor Machine Check

4. Please tho all hackers, gurus all who can suply one of this (books_soft)

5. Turning on cache causes random kernel panics, core dumps

6. Problems installing ppp into 1.3.67 kernel

7. Not so random kernel panics

8. fastest SCSI for Linux & AMD 900?

9. Random NFS panics in OS5

10. Random panics on


12. Sun license manager...1%cpu...1%cpu...50%cpu50%cpu50%cpu....

13. Random Number generator not Random *****