sx_sleep not waking up when timo expires

[John-Mark Gurney]

I recently upgraded my router to an Pine A64-LTS board, and have hit
the same issue as PR 222126[1].  The solution at the end does not work
for me, as I do not have that line in my loader.conf:
kern.timecounter.smp_tsc_adjust=1

I have verified that the wake up does not happen, as I used a dtrace
script to verify that pf_purge_expired_states is called or not called..
When I change the timeout, pf will kick the thread and get things
running again, but it has stopped a couple times later...

I'm running a recent SNAPSHOT:
FreeBSD gate2.funkthat.com 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r336134: Mon Jul  9 19:20:11 UTC 2018     root at releng3.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC  arm64

This is likely reproducable by just starting pf, even in a pass all
mode, and watching for when the function stops getting called...  I'll
see if I can't get an extermely minimal config to reproduce it.

Any suggestions?

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222126

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."