-current userland working for others?

[Jeff Rizzo <riz%tastylime.net@localhost>]

Since the PPC changes brought in a couple weeks ago, I have not been 
able to run a -current userland on my G4/400.

There was a problem where the kernel would not start, which was fixed by 
matt@ after a few days, and I can successfully boot a GENERIC from the 
latest autobuilds.  However, when I unpack userland (base.tgz, in this 
case), basically all binaries except those in /rescue stop working.  I 
get these kinds of messages from the kernel:

trap: pid 694.1 (ls): user read DSI trap @ 0x407eb46c by 0xeff0f2dc 
(DSISR 0x40000000, err=14)
trap: pid 541.1 (dmesg): user ISI trap @ 0x2000 (SRR1=0x4000f032)
trap: pid 167.1 (dmesg): user ISI trap @ 0x2000 (SRR1=0x4000f032)


...once I back out to userland from 20110111, things start working again.

Does anyone have any clue what's going on here?  This is the box that I 
was using to run ATF tests on, and it's basically been idle for three 
weeks because of this.

Thanks,
+j