[Bug 289941] sys/netpfil/common/dummynet:ipfw_queue_v6 test fails on aarch64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289941

            Bug ID: 289941
           Summary: sys/netpfil/common/dummynet:ipfw_queue_v6 test fails
                    on aarch64 in CI
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: arm64
               URL: https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarc
                    h64-test/1774/testReport/junit/sys.netpfil.common/dumm
                    ynet/ipfw_queue_v6/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: kp@freebsd.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 264199
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=264199&action=edit
kyua test report

The 'sys/netpfil/common/dummynet:ipfw_queue_v6' testcase fails on aarch64 in
CI:


===> sys/netpfil/common/dummynet:ipfw_queue_v6
Result:     failed: We failed reversed prioritisation only 2 times.

Standard output:
net.inet6.icmp6.errppslimit: 100 -> 0
Executing command [ ping6 -i .1 -c 3 -s 1200 2001:db8:42::2 ]
01001 queue 100 tcp from 2001:db8:42::2 to any out
01000 queue 200 ipv6-icmp from 2001:db8:42::2 to any out
01002 allow ip6 from any to any
Executing command [ ping6 -c 1 2001:db8:42::2 ]
PING(1248=40+8+1200 bytes) 2001:db8:42::1 --> 2001:db8:42::2
[...] <--- truncated due to garbage characters

Standard error:
1000+0 records in
1000+0 records out
1024000 bytes transferred in 0.607526 secs (1685525 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 0.534731 secs (1914983 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 1.015714 secs (1008158 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 0.796838 secs (1285079 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 0.595035 secs (1720906 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 2.822467 secs (362803 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 1.187764 secs (862124 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 1.454449 secs (704047 bytes/sec)
1000+0 records in
1000+0 records out
1024000 bytes transferred in 1.647715 secs (621467 bytes/sec)


I have reproduced this error using Bricoler with 100 runs for good measure and
attached the failing test report in this bug:

$ bricoler run freebsd-src-regression-suite --param freebsd-src:url=/usr/src
--param freebsd-src:branch= --param
freebsd-src-regression-suite:hypervisor=bhyve --param
freebsd-src-regression-suite:memory=4096 --param
freebsd-src-regression-suite:ncpus=2 --param
freebsd-src-regression-suite:parallelism=1 --param
freebsd-src-regression-suite:count=100 --param
freebsd-src-regression-suite:tests='sys/netpfil/common/dummynet:ipfw_queue_v6'

@kp, since you added the tests in
https://cgit.freebsd.org/src/commit/?id=12184311c16160464a36ae05b1cd8c5e3c24fbaa
(netpfil tests: IPv6 dummynet queue test), please triage as necessary.

NOTE: sys/netpfil/common/dummynet:pf_queue_v6 also seems to fail for a similar
reason.

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