[Bug 249871] NFSv4 faulty directory listings under heavy load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249871

--- Comment #3 from Rick Macklem <rmacklem at FreeBSD.org> ---
Created attachment 218479
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218479&action=edit
log readdirplus VOP_LOOKUP() failures

This little patch adds a printf() that logs VOP_LOOKUP()
errors, if any occur in the NFSv4 server's readdir.
--> VOP_LOOKUP() gets used instead of VFS_VGET() when
    the NFSv4 server is performing Readdir over ZFS,
    since VFS_VGET() is not reliable for ZFS.

    - If the VOP_LOOKUP() fails (I do not think it ever
      should), that would corrupt the Readdir reply.

If you can add this patch to your server and note if
the printf() happens (especially when "ls" fails),
please do so.

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