[Bug 289628] sys/netpfil/pf/nat:endpoint_independent_pass test fails intermittently on aarch64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289628

            Bug ID: 289628
           Summary: sys/netpfil/pf/nat:endpoint_independent_pass test
                    fails intermittently on aarch64 in CI
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: ks@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: kp@freebsd.org, testing@FreeBSD.org

Created attachment 263827
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263827&action=edit
kyua test report

The 'sys/netpfil/pf/nat:endpoint_independent_pass' testcase fails
intermittently on aarch64 in CI:


===> sys/netpfil/pf/nat:endpoint_independent_pass
Result:     failed: server1 did not receive connection from client (default)

Standard output:
net.inet.ip.forwarding: 0 -> 1
add net default: gateway 192.0.2.1

Standard error:
pf enabled
Ethernet rules cleared
rules cleared
nat cleared
0 tables deleted.
rules cleared
0 states cleared
source tracking entries cleared
pf: statistics cleared
pf: interface flags reset
tcpdump: listening on epair3a, link-type EN10MB (Ethernet), snapshot length
262144 bytes
tcpdump: listening on epair2a, link-type EN10MB (Ethernet), snapshot length
262144 bytes
8 packets captured9 packets captured
18 packets received by filter
0 packets dropped by kernel

16 packets received by filter
0 packets dropped by kernel
tcpdump: truncated dump file; tried to read 4 file header bytes, only got 0
reading from file /tmp/kyua.c0arWO/2/work/server2.pcap, link-type EN10MB
(Ethernet), snapshot length 262144



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/pf/nat:endpoint_independent_pass'

@ks, since you made the last significant edit to the tests in
https://cgit.freebsd.org/src/commit/?id=e0fe26691fc98a16cdda9d4f4beea9c5698ac64a
(pf: Add modern NAT syntax), please triage as necessary.

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