[Bug 240609] iflib: Panic with INVARIANTS: sleeping in an epoch section (12.1-pre-QA) (vlan + lagg involved)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240609

--- Comment #2 from Eric Joyner <erj at freebsd.org> ---
I'm not an expert on locking issues, but it appears that lagg_register_vlan()
enters an epoch (via the now-confusingly named LAGG_RLOCK() macro) that
iflib_vlan_register() is run inside of, and the
msec_delay()->safe_pause_ms()->pause() in the em driver is causing the
"sleeping in an epoch section" panic.

A quick fix would be to make em *not sleep* during that e1000_reset_hw_82580()
function, but that doesn't seem ideal; why should it not be allowed to sleep?

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