From: Alistair John Strachan <s0348365@sms.ed.ac.uk>
To: Andi Kleen <ak@suse.de>
Subject: 2.6.16-rc2, x86-64, CPU hotplug failure
Date: Mon, 13 Feb 2006 02:30:41 +0000
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Hi,

In an attempt to play with ACPI S3 on my Athlon 64 X2 3800+, I recompiled 
2.6.16-rc2 with CPU hotplug and ACPI sleep state support. I experienced 
multiple crashes and oopsen, which I quickly discovered were the result of 
bringing at least one CPU back online.

echo 0 >> /sys/devices/system/cpu/cpu1/online

Works, but then if I try to do:

echo 1 >> /sys/devices/system/cpu/cpu1/online

I get an oops. Unfortunately this board has no serial ports so I've taken a 
digital camera shot of the oops. From dmesg, I'm using the PM timer.

[alistair] 02:13 [~] dmesg | egrep time\.c
time.c: Using 3.579545 MHz PM timer.
time.c: Detected 2500.768 MHz processor.
time.c: Using PM based timekeeping.

http://devzero.co.uk/~alistair/oops-20060213/

Find the oops, my config and dmesg for a successful boot at this location.

-- 
Cheers,
Alistair.

'No sense being pessimistic, it probably wouldn't work anyway.'
Third year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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