Created attachment 500235 [details]
gzipped XWD screen dump of rawhide kernel panic

Description of problem:
The last several rawhide kernels, including the latest (2.6.39-1.fc16) panic on boot. Each time there is a new kernel, I delete the newest unbootable kernel before installing the new one, to maximize the number of installed working kernels. I didn't update rawhide in the past 2 days or so, so there's a small chance I missed a working one. In any case, my currently installed ones are

2.6.39-1.fc16.x86_64 ( doesn't boot)
2.6.39-0.rc7.git0.0.fc16.x86_64 (boots)
2.6.39-0.rc6.git6.0.fc16.x86_64 (boots)

This is a VirtualBox 4.0.8 rawhide x86_64 guest in a F15 x86_64 host. I've attached a screenshot of the guest window after the panic (I don't know how to capture the earlier part).

Version-Release number of selected component (if applicable):
kernel-2.6.39-1.fc16.x86_64

How reproducible:
always