Just about when X is about to start after booting, I can see some kernel messages printed to the console. This is a Dell Inspiron 8600 laptop running today's Rawhide, which has an ipw2100 wireless interface and a b44 ethernet interface, both controlled through NetworkManager. The b44 interface was plugged in at the time, and network is working fine using it.
Created attachment 134709 [details] Full dmesg output after booting
Still seeing the same upon every boot with 2.6.17-1.2611.fc6.
Reassigning to correct owner, kernel-maint.
Created attachment 142441 [details] jwltest-ipw2100-lockdep-fix.patch
I am sorry to say that I no longer own the hardware to test this patch on. I only have access to ipw2200 and ipw3945 nowadays. Do any of the CC'ed persons have access to ipw2100 hardware? Or John, did you test this patch already? (hard to say as you were quite light on details ;-))
Test kernels w/ the patch from comment 4 are available here: http://people.redhat.com/linville/kernels/fc6/ They were building last night when I left -- I posted the patch then so I didn't forget. Untested as of now, I'll be booting-up my ipw2100-equipped box shortly.
Hmmm...well upon further review, this is already fixed in 2.6.19. This should make it into fc6 when it gets rebased to 2.6.19.