[Bug 293241] sys/netpfil/ipfw/log:bpf test fails intermittently in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293241

            Bug ID: 293241
           Summary: sys/netpfil/ipfw/log:bpf test fails intermittently in
                    CI
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: glebius@FreeBSD.org
          Reporter: siva@FreeBSD.org
                CC: testing@FreeBSD.org

The 'sys/netpfil/ipfw/log:bpf' testcase fails intermittently in CI:


===> sys/netpfil/ipfw/log:bpf
Result:     atf-check failed; see the output of the test for details

Standard output: 
00100 count log udp from any to any 10100
00200 count log udp from any to any 10200
00201 count log udp from any to any 10201
Executing command [ sh -c wait ; exit 0 ]
Executing command [ sh -c wait ; exit 0 ]
Executing command [ sh -c wait ; exit 0 ]
Executing command [ sh -c wait ; exit 0 ]
Executing command [ tcpdump -nr /tmp/kyua.YpTMju/8744/work/100.pcap ]
Cleaning

Standard error: 
tcpdump: listening on ipfw100, link-type EN10MB (Ethernet), snapshot length
262144 bytes
tcpdump: listening on ipfw301, link-type EN10MB (Ethernet), snapshot length
262144 bytes
tcpdump: listening on ipfw200, link-type EN10MB (Ethernet), snapshot length
262144 bytes
tcpdump: listening on ipfw201, link-type EN10MB (Ethernet), snapshot length
262144 bytes
1 packet captured
1 packet received by filter
0 packets dropped by kernel
1 packet captured
1 packet received by filter
0 packets dropped by kernel
1 packet captured
1 packet received by filter
0 packets dropped by kernel
Fail: incorrect exit status: 1, expected: 0
stdout:

stderr:
tcpdump: truncated dump file; tried to read 4 file header bytes, only got 0


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/netpfil/ipfw/log:bpf'

@glebius, since you added the test in
https://cgit.freebsd.org/src/commit/?id=35caa56a329deb0d13aa48ea1a6f7c1d5ebdb073
(tests/ipfw: add a test for ipfw(4) log rules that write to bpf(4)), please
triage as necessary.

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