[Bug 289240] sys/netlink/netlink_socket:overflow testcase fails on arm64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289240

            Bug ID: 289240
           Summary: sys/netlink/netlink_socket:overflow testcase fails on
                    arm64 in CI
           Product: Base System
           Version: CURRENT
          Hardware: arm64
               URL: https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarc
                    h64-test/1756/testReport/sys.netlink/netlink_socket/ov
                    erflow/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: glebius@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 263392
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263392&action=edit
kyua test report

The 'sys/netlink/netlink_socket:overflow' testcase fails on arm64 with the
following message:


sys/netlink/netlink_socket:overflow  ->  failed:
/usr/home/siva/src/fbsdsrcgit/tests/sys/netlink/netlink_socket.c:142: send(fd,
&hdr, sizeof(hdr), 0) == sizeof(hdr) not met  [2.037s]


This failure is also visible in CI here and has been failing for the past 500+
runs:
https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarch64-test/1756/testReport/sys.netlink/netlink_socket/overflow/

I have reproduced this error using Bricoler with 100 runs for good measure:

$ 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/netlink/netlink_socket:overflow'

@glebius I see that you have written the tests in
https://cgit.freebsd.org/src/commit/?id=0ad011ececb978e22a9bff2acf76633b094f1ff6
(tests/netlink: add netlink socket buffer test). Please triage as necessary.

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