[Bug 293777] sys/netinet6/proxy_ndp:pndp_neighbor_advert test fails in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293777

            Bug ID: 293777
           Summary: sys/netinet6/proxy_ndp:pndp_neighbor_advert test fails
                    in CI
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
               URL: https://ci.freebsd.org/job/FreeBSD-main-amd64-test/280
                    25/testReport/sys.netinet6/proxy_ndp/pndp_neighbor_adv
                    ert/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: pouria@freebsd.org
          Reporter: siva@FreeBSD.org
                CC: testing@FreeBSD.org

The 'sys/netinet6/proxy_ndp:pndp_neighbor_advert' testcase is currently failing
in CI:


===> sys/netinet6/ndp:ndp_prefix_lifetime_extend 
Result:     failed: Expiry time was shortened: 20 <= 19 

Standard output: 
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=31s,
retrans=1s0ms
Flags: nud auto_linklocal stableaddr 
Executing command [ jexec v6t-pndp_neighbor_advert_a ndp -s 2001:db8::aaaa
1a:b1:96:f4:87:74 proxy ]
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=28s,
retrans=1s0ms
Flags: nud auto_linklocal stableaddr 
PING(56=40+8+8 bytes) 2001:db8::2 --> 2001:db8::aaaa

--- 2001:db8::aaaa ping statistics ---
1 packets transmitted, 0 packets received, 100.0% packet loss
Executing command [ jexec v6t-pndp_neighbor_advert_b ndp -an ]

Standard error: 
Fail: regexp 2001:db8::aaaa +1a:b1:96:f4:87:74 +epair0b not in stdout
Neighbor                             Linklayer Address  Netif Expire    S Flags
2001:db8::aaaa                       (incomplete)      epair0b 1s        I 
2001:db8::2                          86:79:fb:2b:85:3d epair0b permanent R 
fe80::8479:fbff:fe2b:853d%epair0b    86:79:fb:2b:85:3d epair0b permanent R 


This is reproducible using Bricoler (master-python branch) with the following
command:

bricoler freebsd-regression-test-suite --freebsd-src-git-checkout/url=/usr/src
--freebsd-src-git-checkout/branch= --freebsd-regression-test-suite/memory=4096
--freebsd-regression-test-suite/ncpus=2
--freebsd-regression-test-suite/parallelism=1
--freebsd-regression-test-suite/tests='sys/netinet6/proxy_ndp:pndp_neighbor_advert'

pouria@, I bisected this failure to your commit
https://cgit.freebsd.org/src/commit/?id=f37fbe30f559acfb269f67d3efe59569878a3ee1
(ndp: implement delayed anycast and proxy NA), please triage as necessary.

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