[Bug 253888] exclusive sleep mutex vtnet0-rx0 (vtnet0-rx0) r = 0 (0xfffff800035d4780) locked

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253888

--- Comment #11 from Mark Johnston <markj@FreeBSD.org> ---
The problem with dropping the lock is that the receive path may schedule a
taskqueue thread to do further receive processing.  Then, the lock prevents two
threads from servicing the receive queue at once.  Dropping the lock as in our
patches means that they might interleave, which can probably cause packet
reordering issues.  So, while the patch fixes the LOR, it probably introduces a
different problem.

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