[Bug 246577] sysutils/fuse-ntfs triggers a cache inconsistency kernel error message

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246577

            Bug ID: 246577
           Summary: sysutils/fuse-ntfs triggers a cache inconsistency
                    kernel error message
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: bsdpr at phoe.frmug.org

On a 12-STABLE system (r360207) running fusefs-libs-2.9.9_1 and
fusefs-ntfs-2017.3.23 (UBLIO disabled at compile time), while a large copy
operation to an ntfs was running I did a "du -s" on that same filesystem to
estimate progression and was rewarded by the following message on console:

kernel: fuse_internal_do_getattr: cache incoherent on /mnt!  Buggy FUSE server
detected.  To prevent data corruption, disable the data cache by mounting with
-o direct_io, or as directed otherwise by your FUSE server's documentation

A subsequent du(1) execution produced the same message.

Is this expected or is this a bug? Should I actually be worried about the
filesystem integrity?

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