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Subject: profile locking at wrong level when re-reading file
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With the profile-sharing code enabled, the mutex protects the linked
list of prf_data_t objects and their refcounts.  However, once one of
these objects has been acquired for a profile instance, it's used
without locking.  Mostly it's read-only access, but if the on-disk file
has changed, the tree of nodes will be freed and rebuilt, with no mutex
protection.