[Bug 283293] ath0 (Atheros AR946x/AR948x) timeout issues

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283293

--- Comment #2 from William D. Pool <rotaecho@gmail.com> ---
Performing some debugging I have verified the following.

With and without PowerD enabled the below behavior is consistent.

I'm able to perform ICMP pings between host-a (FreeBSD FW16) and host-b
(macbook pro OSX) bi-directional without obtaining any ath0 device timeouts on
the FreeBSD host-a.

This has been performed up to 2hrs without issues on various tests.

However, soon as any TCP based service to or from the FreeBSD (host-a) machine
the whole stack locks up and I obtain ICMP timeouts on those same ICMP pings. 

The most obvious TCP test was SSH. 

Once you try to SSH to / from the FreeBSD host-a machine the whole network
stack locks-up/freezes. 

Soon as I kill whatever the TCP process (SSH for example) is on the FreeBSD
host-a or to the FreeBSD host-a within 45-60seconds the ICMP pings proceed and
there's no device timeouts. 

Something is causing the device to lock/freeze on TCP connections.

I will try to obtain some kernel debugging info

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