Commits on Aug 26, 2020

1. dnode_sync is careless with range tree …

   Because dnode_sync_free_range() must drop dn_mtx during its processing,
   using it as a callback to range_tree_vacate() is not safe.  No other
   operations (besides destroy) are allowed once range_tree_vacate() has
   begun, and dropping dn_mtx would leave a window open for another thread
   to observe that invalid (and unsafe) state via dnode_block_freed().
   
   Signed-off-by: Patrick Mooney <pmooney@oxide.computer>
   Closes openzfs#10708

   

   pfmooney committed Aug 26, 2020
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