Proposed resolution:

Change the following paragraph from § 2.1 [fs.conform.9945]

The behavior of functions described in this Technical Specification may differ from their specification in the presence of file system races ([fs.def.race]). No diagnostic is required.

Behavior is undefined if calls to functions provided by this Technical Specification introduce a file system race (4.6 [fs.def.race]).

Insert a new sub-section head before the modified paragraph:

2.1 File system race behavior [fs.race.behavior]