My Macbook Pro locked up twice today. Lines like the following appeared repeatedly in the system log.

Dec 19 16:10:35 Foamy kernel[0]: shared_region: 0x50b6894: lsf_map: unable to allocate mapping

I had installed ShapeShifter (MacHeist bundle!) recently. I disabled it in the APE preference pane. Hopefully the lockups stop.

I could ping the machine. I could even partially ssh in:

kernel[0]: shared_region: 0x707ecec: lsf_map: unable to allocate mapping
Foamy sshd[4215]: fatal: Timeout before authentication for 172.17.23.7
kernel[0]: shared_region: 0x56659a4: lsf_map: unable to allocate mapping

But it was effectively dead.