"Luigi Genoni" <[email protected]> writes:
> reproduced.
> it took more or less one hour to reproduce it. I could reproduce it olny
> running also irqbalance 0.55 and commenting out the sleep 1. The message in
> syslog is the same and then, after a few seconds I think, KABOM! system crash
> and reboot.
>
> I tested also a similar system that has 4 dual core CPU Opteron 2600MHZ. On
> this system (linux sees 8 CPU, but it is the same kernel, same gcc, same
> config, same glibc, same active services) I could not reproduce it even
> running irqbalance 0.55 in almost 1 hour. Maybe I could reproduce it waiting
> for more time, but my users need to do their work, so I could not have a
> longer test window. So on 16 CPU I had the crash, on 8 CPU I had no crash.
>
> I need to give back the system to the users, so if you need other tests,
> please, tell me as soon.
Ok. Since it seems to be the irq code I'm going to need to get a dump
of the state of the apics, basically the output print_IO_APIC from the time
this happens.
I'm not really out of bed yet so no patch but a heads up. Once I've finished
sleeping I'll look at putting a debugging patch together.
Getting a bootlog of the identical system that would not crash at 8 cpus
would be interesting. In part this is because the number of apic modes
that are available for use are much fewer when we have 8 or more cpus,
so it would be interesting to see if it is actually using the same code
for interrupt delivery.
If you have a few minutes to try it, it would be interesting to know
if forcing the migration from the command line (as I was suggesting)
would reproduce this faster than irqbalance.
Hopefully I can think up things to fix this when I wake up.
The time zone difference is going to be a pain :(
Eric
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