[Bug 270810] munmap does not always sync the underlying file

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 14 Apr 2023 22:44:30 UTC

--- Comment #5 from geoffrey@dommett.com ---
update. calling msync with MS_SYNC only reduces the number of pages that fail
to be written. it does not eliminate them. The return value of msync is 0, so
the system claims that the call has succeeded, when it evidently has not.

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