[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 #4 from Joshua Kinard <freebsd@kumba.dev> ---
(In reply to Joshua Kinard from comment #3)
The problem looks to still be present in 15.0-RELEASE.  I booted the one system
experiencing this issue, a NUC8i5BEK, and when running 'jail -r <jail>, the
interface stops responding for several seconds while the jail shuts down and
the em0 interface is removed from bridge0.  I can test this by pressing a key
several times in an SSH session and there will be no input/output until the
interface picks back up.  Conversely, if I use net/intel-em-kmod, after
patching it slightly to make it work with 15.0-RELEASE, the hang does not
happen and you can type stuff while the 'jail -r' command is running.

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