[Bug 217261] sys/aio/aio_test:aio_md_test fails semi-frequently with Jenkins with "aio_write failed: Operation not supported"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217261

--- Comment #1 from Alan Somers <asomers at FreeBSD.org> ---
I noticed that problem, but I can't reproduce it locally.  This is what jhb
told me:

Hmmm, qphysio to a character device is always considered "safe".  The
failure must be due to another reason (e.g. there is a system-wide
quota on the number of AIO character device requests in flight).

You might want to see if vfs.aio.num_buf_aio == vfs.aio.max_buf_aio when
it fails.

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