[Bug 290837] bin/sh/builtins/functional_test:read11 test fails intermittently on arm64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290837

            Bug ID: 290837
           Summary: bin/sh/builtins/functional_test:read11 test fails
                    intermittently on arm64 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: bdrewery@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: lwhsu@FreeBSD.org, testing@FreeBSD.org

Created attachment 265208
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=265208&action=edit
kyua test report

The 'bin/sh/builtins/functional_test:read11' testcase fails intermittently on
arm64 in CI:


===> bin/sh/builtins/functional_test:read11
Result:     failed: atf-check failed; see the output of the test for details

Standard output:
Executing command [ /bin/sh /usr/tests/bin/sh/builtins/read11.0 ]

Standard error:
Fail: incorrect exit status: 1, expected: 0



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='bin/sh/builtins/functional_test:read11'

@bdrewery, since you added the test in
https://cgit.freebsd.org/src/commit/?id=e31fb97148f7a392aaf6cc84579a232f2969b9d1
(read builtin: Empty variables on timeout), please triage as necessary.

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