I blacklisted iwl3945, and the boot goes normally with no hang
(replicated about 50 times)

So I tried the following at the shell:

# while true; do modprobe iwl3945; sleep 0.1; modprobe -r iwl3945; sleep
0.1; done

Unfortunately this did not cause a hang, even after hundreds of
iterations.


The only difference between that and what udev is doing is that udev may load 
modules in parallel.

So I blacklisted tg3 as well, then tried the attached shell script.

** Attachment added: "Script to repeatedly load iwl3945 and tg3 together"
   http://launchpadlibrarian.net/18641918/test.sh

-- 
[regression] 2.6.27-7 sometimes fails to boot (iwl3945 issue?)
https://bugs.launchpad.net/bugs/263059
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