[Bug 284057] vmxnet3/iflib: crash in vmxnet3_isc_txd_credits_update

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284057

--- Comment #13 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Andriy Gapon from comment #12)
I don't quite understand the comment either, but it makes some sense to me that
the sysctl hides the problem: the bug is that vmxnet3_isc_txd_credits_update()
can be called multiple times in parallel, from an interrupt handler and from
the transmit path.  The latter happens when ifmp_ring_enqueue() drains the
ring, and this is inhibited when abdicate == 0.

But, I think concurrent calls to vmxnet3_isc_txd_credits_update() is still
possible even with that setting, e.g., from _task_fn_tx().

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