o Add two comments identifying problems with the current nfs_lock.c   implementation, so that the information doesn't get lost.   (1) /var/run/lock is looked up relative to the current thread's root       directory, but it's not clear that's desirable.   (2) A race condition associated with live credential modification on       a shared credential is present when privilege is granted for       the purposes of talking to /var/run/lock.
o Add two comments identifying problems with the current nfs_lock.c
  implementation, so that the information doesn't get lost.
  (1) /var/run/lock is looked up relative to the current thread's root
      directory, but it's not clear that's desirable.
  (2) A race condition associated with live credential modification on
      a shared credential is present when privilege is granted for
      the purposes of talking to /var/run/lock.

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