[Bug 290575] sys/net/if_tun_test:transient test fails intermittently in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290575

            Bug ID: 290575
           Summary: sys/net/if_tun_test:transient test fails
                    intermittently in CI
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
               URL: https://ci.freebsd.org/view/Test/job/FreeBSD-main-amd6
                    4-test/27059/testReport/sys.net/if_tun_test/transient/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: kib@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: kevans@freebsd.org, testing@FreeBSD.org

The 'sys/net/if_tun_test:transient' testcase is now failing in CI:


===> sys/net/if_tun_test:transient
Result:     failed: Test case body timed out

Standard output:
Executing command [ jexec one ifconfig tun0 ]


I can reproduce this error locally 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/net/if_tun_test:transient'

@kib, I have bisected the failure to your commit
https://cgit.freebsd.org/src/commit/?id=4dbe6628179d8e6bf400bfdb4bfa869bdc102a56
(devfs: make destroy_dev() a release barrier for cdevpriv destructors runs).
Please triage as necessary.

@kevans, cc'd you since you added the tests in commit
https://cgit.freebsd.org/src/commit/?id=a1174b3b1174754b1f69406bff4456d002e8f583
(tun(4)/tap(4): allow devices to be configured as transient).

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