hang "Starting udev:_" after last good: kernel-2.6.15-1.1826.2.10_FC5

[John Reiser <jreiser BitWagon com>]

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=178708#c2

All daily rawhide kernels after 2.6.15-1.1826.2.10_FC5 hang during
init with "Starting udev:_" where the underscore '_' indicates that
the VGA blinking underline cursor has stopped blinking.  There is
no response to any keyboard input; hardware reset is required.
The hardware is plain clone and has been reliable.

Booting with serial console reveals nothing other than what is on
the VGA screen: in particular, no Oops messages.  Package versions are:
  kernel-2.6.15-1.1878_FC5  (hangs)
  udev-078-7
  initscripts-8.21-1
  kernel-2.6.15-1.1826.2.10_FC5  (works)

Suggestions?

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