Suspending the laptop (a Thinkpad T61) is what triggers this spew of
e1000e errors.  The laptop sleeps fine, but the errors appear just
before suspend and continue after resume.

rmmod e1000e stops the error flood, but a subsequent modprobe e1000e
hangs burning 100% of one CPU core inside the kernel.  The modprobe
process can be stopped with SIGQUIT (C-\).

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e1000e mutex contention
https://bugs.launchpad.net/bugs/291801
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