webmin is killing rawhide

["David Mack" <davidwmack gmail com>]

I'm trying to install webmin-1.420 on my Rawhide box from an RPM:

# rpm -ihv webmin-1.420-1.noarch.rpm
Preparing...                ########################################### [100%]
Operating system is Redhat Linux
   1:webmin                 Segmentation fault#######                   ( 58%)

After this segfault, the machine instantly becomes unusable. Commands
issued in a shell don't complete and can't be killed. Menu pulldowns
don't. Attempts to switch to a vty fail. CTL-Alt-Del does nothing.
Ctl-Alt-BS clears the desktop but it eventually gets redrawn. A
running xload window shows the loadavg heading for the troposphere but
I can't get a process list. The only solution I've found to date is to
powercycle the machine.

Kernel is 2.6.26-0.64.rc5.git7.fc10.i686.

Installing the same webmin rpm works perfectly on an F9 box.

Suggestions for debugging this would be welcome.

Dave