[Bug 289815] sys/netinet6/ndp:ndp_del_gu_success test fails intermittently on aarch64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289815

            Bug ID: 289815
           Summary: sys/netinet6/ndp:ndp_del_gu_success test fails
                    intermittently on aarch64 in CI
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: melifaro@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 264058
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=264058&action=edit
kyua test report

The 'sys/netinet6/ndp:ndp_del_gu_success' testcase fails intermittently on
aarch64 in CI:


===> sys/netinet6/ndp:ndp_del_gu_success
Result:     failed: atf-check failed; see the output of the test for details

Standard output:
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=23s,
retrans=1s0ms
Flags: nud auto_linklocal 
Executing command [ jexec v6t-ndp_del_gu_success ndp -nd 2001:db8::2 ]

Standard error:
ifconfig: getnameinfo: Address family not recognized
ping: UDP connect: Can't assign requested address
Fail: incorrect exit status: 1, expected: 0
stdout:

stderr:
ndp: delete 2001:db8::2: No such file or directory


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/netinet6/ndp:ndp_del_gu_success'

@melifaro, since you added the tests in
https://cgit.freebsd.org/src/commit/?id=f17f94cd1b99c61faa08aa988b47805c53b78ac7
(Add arp/ndp tests in addition to rtsock ll tests.), please triage as
necessary.

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