Xorg failure (segfault after vm_error: pager read error, pid 1562 (Xorg)) on Amd64

[David Mackay]

Hello,

Today I undertook to update my kernel and world, last built on July
the 5th, to the latest -CURRENT sources from svn.

Upon starting Xorg, this error emerged:

vm_error: pager read error, pid 1562 (Xorg)
Segmentation fault at address 0x80081e000

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting

I am running on a Lenovo ThinkPad W530 with Intel IvyBridge graphics via KMS.

Thanks,
David Mackay