[Bug 280074] em(4) temporarily hangs and re-enables TX CSUM if a bridge it's a member of is modified

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280074

--- Comment #12 from Joshua Kinard <[email protected]> ---
(In reply to Zhenlei Huang from comment #9)
I am actually running 15.0-RELEASE on this particular machine (NUC8i5BEK), so I
can't downgrade back to 14.x.  Has anyone looked at why the net/intel-em-kmod
driver doesn't cause the issue I am describing, but the in-tree one does? 
That's why I am leaning towards it being a problem in em(4) itself, not
bridge(4) or epair(4).  If it were one of those two, I would expect a similar
issue, if not the same one, to manifest under both drivers.

(In reply to Michael Tuexen from comment #11)
I gave this patch a test on the affected machine, and it did not resolve the
problem I am describing.

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