Konstantin Belousov 8211bd45bc Close a race due to dropping of the map lock between creating map entry
for a shared mapping and marking the entry for inheritance.
Other thread might execute vmspace_fork() in between (e.g. by fork(2)),
resulting in the mapping becoming private.

Noted and reviewed by:	alc
MFC after:	1 week
2012-02-11 17:29:07 +00:00
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