* Ingo Molnar <[email protected]> wrote:
> ugh. Something really weird happened with this e1000 problem.
>
> i crashed the laptop in a weird way and had to power-cycle it in an
> unusual fashion. After that i wanted to try your latest BUG_ON()
> theory but the network hang went away!
>
> For 3 hours i tried to reproduce the hang (i went back to the original
> git tree and the .config under which i found it, i power cycled it
> again, i unplugged the power cord to make it go off battery, unplugged
> the ethernet, recreated a completely new tree, etc. etc.) but with no
> success! Total Heisenbug - and the really annoying thing is that you
> just had a good theory about what might be happening. I'm now at
> kernel build iteration #75 in this tree ...
ah! Just found the reason: the bug apparently depends on the precise
kernel command-line contents. I accidentally dropped ignore_loglevel
(found this while comparing with the older logs i sent to you), adding
it back in produces hung networking too. So it appears that a netconsole
printout while e1000 is initializing (or while some other networking
component is initializing) might be the culprit?
Ingo
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