[Bug 273215] nullfs: modification times incorrect, breaking make etc.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273215

            Bug ID: 273215
           Summary: nullfs: modification times incorrect, breaking make
                    etc.
           Product: Base System
           Version: 13.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: andrew@tao11.riddles.org.uk

Created attachment 244204
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=244204&action=edit
file creation test script for modtimes bug

On (recent) 13.2-STABLE, but apparently not on CURRENT, the modification times
of created files on nullfs (at least when the lower filesystem is UFS, haven't
tried other combinations yet) are ending up some arbitrary time later than they
should be, as though the "marked for update" condition is not being processed
when it should.

For example, running the attached test on 13.2-stable, despite taking 2 seconds
delay between creating files, file 2 ends up looking older than file 1, and
files 1,3,4 end up with the same timestamp.

This manifests in build failures for ports if the port workdir is on a nullfs
mount, because for example the files created by autoreconf / libtoolize / etc.
end up with timestamps that don't match their dependency order, resulting in
erroneous attempts to rebuild them in build phase (an example of a port that
fails reliably is graphics/graphviz).

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