[Bug 289382] sys/netinet6/lpm6:lpm6_test1_success test fails intermittently on aarch64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289382

            Bug ID: 289382
           Summary: sys/netinet6/lpm6:lpm6_test1_success 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: melifaro@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 263608
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263608&action=edit
kyua test report

The 'sys/netinet6/lpm6:lpm6_test1_success' testcase fails intermittently on
aarch64 with the following message:


Standard output:
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=18s,
retrans=1s0ms
Flags: nud auto_linklocal 
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=40s,
retrans=1s0ms
Flags: nud auto_linklocal 
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=35s,
retrans=1s0ms
Flags: nud auto_linklocal 
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=36s,
retrans=1s0ms
Flags: nud auto_linklocal 
add host 2001:db8::2:0: gateway fe80::5a9c:fcff:fe10:7e0f%epair0a
add host 2001:db8::2:1: gateway fe80::5a9c:fcff:fe10:5fd3%epair1a
Executing command [ jexec v6t-lpm6_test1_successa ping -6 -f -nc20
2001:db8::2:0 ]

Standard error:
ifconfig: interface up does not exist
ifconfig: getnameinfo: Address family not recognized
Fail: regexp 20 packets transmitted, 20 packets received not in stdout
PING(56=40+8+8 bytes) fe80::5a9c:fcff:fe10:7440%epair0a --> 2001:db8::2:0
....................
--- 2001:db8::2:0 ping statistics ---
20 packets transmitted, 1 packets received, 95.0% packet loss
round-trip min/avg/max/stddev = 956.744/956.744/956.744/0.000 ms


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/lpm6:lpm6_test1_success'

@melifaro, since you wrote the tests in
https://cgit.freebsd.org/src/commit/?id=768c98a737ef957ee26afd30d5e2a7e83b97e34f
(Add basic routing LPM tests), please triage as necessary. Note that this test
seems to consistently pass on amd64, but intermittently fails on aarch64.

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