Just tested and this bug doesn't happen with current Natty's kernel.

linux-image-2.6.35-1101-omap4          2.6.35-1101.4

root@panda-natty:~# echo 0 | sudo tee /sys/devices/system/cpu/cpu1/online
0
root@panda-natty:~# dmesg
[ 1926.179595] CPU1: shutdown
root@panda-natty:~# echo 1 | sudo tee /sys/devices/system/cpu/cpu1/online
1
root@panda-natty:~# dmesg
[ 1926.179595] CPU1: shutdown
[ 1931.928710] CPU1: Booted secondary processor


** Tags added: armel

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https://bugs.launchpad.net/bugs/707003

Title:
  Kernel panic when trying to offline CPU1

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