[Bug 238708] remount-ro hangs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238708

            Bug ID: 238708
           Summary: remount-ro hangs
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: aler at playground.ru

Unfortunately currently I have not enough information about this problem, but
I'm sure there is some problem or problems.

1) multiple times I observed very long remount-ro (mount -u -o ro) for some
partition with a lot of disk activity from mount program during that. All that
was some time ago and currently I forgot details. I'm not sure that this issue
still exists in 11.2-RELEASE but i think it is related to next one.

2) Recent one:
  "mount -u -o ro" was hanged for a few second and then wrote "mount:
/path/to/mountpoint: Resource temporarily unavailable"
  Second attempt of "mount -u -o ro" resulted in deadlock in "suspwt" state of
mount program. A lot of processes was deadlocked in state "suspfs". Not sure
which of them appeared first.
  There was no disk activity (in gstat) for remounted partition during this
deadlock.

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