Bad system call errors during an upgrade of -current

[Dustin Marquess <dmarquess%gmail.com@localhost>]

I'm trying to upgrade a VM from a 9.99.10 install that was built
around Sep 2th to a 9.99.46 install compiled yesterday.

I installed the new kernel and modules and rebooted into the new
kernel / old userland.  Once done, almost everything crashes with Bad
system call.  So far "su -", "ls" and even the configure instance the
a build.sh install kicked off died with one.

Is this a known issue?  I don't believe I missed a step in the upgrade
instructions...

Thanks!
-Dustin