On Thu, 24 Mar 2011, Ingo Molnar wrote:

> FYI, some sort of boot crash has snuck upstream in the last 24 hours:
>
>  BUG: unable to handle kernel paging request at ffff87ffc147e020
>  IP: [<ffffffff811aa762>] this_cpu_cmpxchg16b_emu+0x2/0x1c

Hmmm.. This is the fallback code for the case that the processor does not
support cmpxchg16b.