[Bug 214495] [nfs] random birthtime flaps between -1 and 582.-2129133845024

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214495

            Bug ID: 214495
           Summary: [nfs] random birthtime flaps between -1 and
                    582.-2129133845024
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rs at bytecamp.net

Running stat(1) on a shared NFS directory sometimes gives st_birthtime=582.
Subsequent calls to stat(1) on the same directory will give st_birthtime=-1.

After performing a ktrace on "mount -a", I noticed this value too:

   521 mount    0.002914 CALL  lstat(0x7fffffffe660,0x7fffffffd998)
   521 mount    0.002916 NAMI  "/home/foo/bar/baz"
   521 mount    0.003277 STRU  struct stat {dev=973537125, ino=4, mode=040510,
nlink=3, uid=80, gid=14140, rdev=53587, atime=1444828750.030469757,
stime=1445418141.656773130, ctime=1445418141.656773130,
birthtime=582.-2129133845024, size=3, blksize=4096, blocks=1, flags=0x0 }

Is that correct behaviour?

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