[Bug 289816] usr.sbin/syslogd/syslogd_test:pipe_action test fails intermittently on aarch64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289816

            Bug ID: 289816
           Summary: usr.sbin/syslogd/syslogd_test:pipe_action 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: jfree@freebsd.org
          Reporter: me@svmhdvn.name
                CC: markj@FreeBSD.org, testing@FreeBSD.org

Created attachment 264059
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=264059&action=edit
kyua test report

The 'usr.sbin/syslogd/syslogd_test:pipe_action' testcase fails intermittently
on aarch64 in CI:


===> usr.sbin/syslogd/syslogd_test:pipe_action
Result:     failed: atf-check failed; see the output of the test for details

Standard output:
Executing command [ ifconfig lo0 inet 127.0.0.1/16 ]
new socket fd is 5
listening on socket
sending on socket
new socket fd is 6
listening on socket
sending on socket
Trying peer: /tmp/kyua.cnoxtC/2/work/log.sock
new socket fd is 7
listening on socket
sending on socket
Trying peer: /tmp/kyua.cnoxtC/2/work/logpriv.sock
new socket fd is 9
listening on socket
sending on socket
can't open /dev/klog (16)
off & running....
init
cfline("user.debug      | sed -i '' -e 's/Saymore Crey/Seymour Cray/g'        
/tmp/kyua.cnoxtC/2/work/pipe_action.log", f, "pipe", "*", "*")
X 7 X X X X X X X X X X X X X X X X X X X X X X X PIPE:  sed -i '' -e
's/Saymore Crey/Seymour Cray/g'         /tmp/kyua.cnoxtC/2/work/pipe_action.log
(pipe)
logmsg: pri 56, flags 0, from , msg restart
syslogd: restarted
logmsg: pri 6, flags 0, from , msg kernel boot file is /boot/kernel/kernel
kernel boot file is /boot/kernel/kernel
Executing command [ logger -p user.debug -t pipe -h
/tmp/kyua.cnoxtC/2/work/log.sock fix spelling error ]
received sa_len = 16
logmsg: pri 17, flags 0, from , msg fix spelling error
Logging to PIPE  sed -i '' -e 's/Saymore Crey/Seymour Cray/g'        
/tmp/kyua.cnoxtC/2/work/pipe_action.log
Executing command [ cat /tmp/kyua.cnoxtC/2/work/pipe_action.log ]

Standard error:
Fail: regexp Seymour Cray not in stdout
"While I'm digging in the tunnel, the elves will often come to me         with
solutions to my problem."
-Saymore CreyFiles left in work directory after failure: log.sock,
logpriv.sock, pipe_action.log, syslog.conf, syslogd.pid
pkill: Cannot get process list (kvm_getprocs: No such process)



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='usr.sbin/syslogd/syslogd_test:pipe_action'

@jfree, since you added the tests in
https://cgit.freebsd.org/src/commit/?id=fcace2906ddfae6bee6064b63a6df44be1bdf04b
(syslogd: Add some basic regression tests), please triage as necessary.

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