[Bug 259458] iflib_rxeof NULL pointer crash with vmxnet3 driver

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259458

--- Comment #13 from Andriy Gapon <avg@FreeBSD.org> ---
(In reply to Andriy Gapon from comment #12)
Applied the fix but still seeing variations of the crash.

The data I see makes me think that somehow concurrent calls to
iflib_fl_refill() for the same iflib_fl_t (free list) are happening.

One hypothetical possibility is that iflib_stop/iflib_fl_setup are not
sufficiently synchronized with the taskqueue threads (that call _task_fn_rx). 
I am not familiar with grouptask / taskqgroup code, but I do not see any
drain-like calls.

So, I wonder if there could be a race between an enqueued task and the
stop/setup operations.

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