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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/707003 Title: Kernel panic when trying to offline CPU1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs