[Bug 255830] dummynet(4) queues/pipes do not work inside of a VNET jail

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255830

Peter Much <pmc@citylink.dinoex.sub.org> changed:

           What    |Removed                     |Added
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                 CC|                            |pmc@citylink.dinoex.sub.org

--- Comment #9 from Peter Much <pmc@citylink.dinoex.sub.org> ---
I am seeing these messages too, and no, Joshua, You're not the only one trying
such things with dummynet.

A few comments:
* dummynet did never malfunction, it did simply reinsert the shaped packets
into the host's ipfw instead of the jail's one - because there was only one
dummynet on the system. The issue was more serios: every jail could manipulate
the hosts pipes parameters, so it was necessary to run jails in securelevel=3.
* This appears to be fixed in 13.1. Kudos to the author!
* What has sadly not been fixed alongside is the same issue with ng_ipfw,
(Should be simpler, because netgraph itself is already VIMAGE-able)

I once tried the bufferbloat thing, ran into the very same issue, considered it
too difficult to fix on my own, and then moved the router into a bhyve instead.
There timing issues were more challenging, but the shaping apparently did work.
Currently it doesn't anymore. Thanks for Your configuration data, that might
help me when looking into that issue occasionally - maybe the bhyve has to
leave again.

Now I tried to do the ng_ipfw fix myself, but with horror then noticed the
beforementioned error-messages, and another one that looks worse:

Apr 22 15:34:06 <kern.crit> edge kernel: Freed UMA keg (IPFW counters) was not
empty (1 items).  Lost 20 pages of memory.
Jun 15 20:41:45 <kern.crit> edge kernel: Freed UMA keg (IPFW counters) was not
empty (2 items).  Lost 40 pages of memory.
Jun 26 17:06:23 <kern.crit> edge kernel: [55226] Freed UMA keg (IPFW counters)
was not empty (3 items).  Lost 60 pages of memory.
Jun 28 22:42:20 <kern.crit> edge kernel: [248183] Freed UMA keg (IPFW counters)
was not empty (3 items).  Lost 40 pages of memory.

But this one also obviousely exists since upgrade to 13.1 (RC2), and seems to
happen at shutdown after some uptime; it cannot be related to my recent
hacking. 
(I do massive and frequent ruleset updates during runtime.)

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