On Sat, Mar 14, 2020 at 07:43:44PM +0000, Patrick Kelsey wrote:

> Author: pkelsey
> Date: Sat Mar 14 19:43:44 2020
> New Revision: 358995
> URL: https://svnweb.freebsd.org/changeset/base/358995
> 
> Log:
>   Fix iflib freelist state corruption
>   
>   This fixes a bug in iflib freelist management that breaks the required
>   correspondence between freelist indexes and driver ring slots.
>   
>   PR:         243126, 243392, 240628

Are you sure?
Bug 240628 - sysutils/zfsnap2: Completion script link for zsh has
wrong path 

>   Reported by:        avg, alexandr.oleyni...@gmail.com, Harald Schmalzbauer
>   Reviewed by:        avg, gallatin
>   MFC after:  1 week
>   Differential Revision:      https://reviews.freebsd.org/D23943

Very interesting.
Is this related to my problem?
I am have trouble w/ netmap:

1. netmap reported RX slots filled all ring (tail == head-1)
2. application processed all RX slots and reported to nemap (head == tail)
3. RX stuck.

workaround: report on step 2 head = tail-1 (one RX slots left
unprocessed).

Also I am have trouble w/ TX, similar.
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