I'm up over 1,000 iterations with the new kernel.  I am content that
disabling ftrace has fixed the problem.

>From the available information, and note that I'm *way* out of my
comfort zone and area of expertise here, I would hypothesise that having
the __init section of another module discarded while iwl3945 is
initialising causes memory corruption due to the ftrace bug - and due to
the complex initialisation of the PCI device thanks to the kill switch
behaviour, this can result in a hang.

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