[Bug 217100] POSIX AIO intermittently returns EOPNOTSUPP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217100

            Bug ID: 217100
           Summary: POSIX AIO intermittently returns EOPNOTSUPP
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

In FreeBSD's CI tests, the aio tests for md(4) devices intermittently return
EOPNOTSUPP.  According to the man page, aio-write(2) will return EOPNOTSUPP if
unsafe AIO is disabled and the AIO operations on that file descriptor are
unsafe.  During FreeBSD's CI tests, unsafe AIO is indeed disabled.  But that
doesn't explain why the test is intermittent.

https://ci.freebsd.org/job/FreeBSD-head-amd64-test/1607/testReport/sys.aio/aio_test/md_poll/
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/1607/testReport/sys.aio/aio_test/md_poll/history/

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