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Matthew Ahrens
df7eeccc75
This is a race condition in the deadlist code. A thread executing an administrative command that uses dsl_deadlist_space_range() holds the lock of the whole deadlist_t to protect the access of all its entries that the deadlist contains in an avl tree. Sync threads trying to insert a new entry in the deadlist (through dsl_deadlist_insert() -> dle_enqueue()) do not hold the deadlist lock at that moment. If the dle_bpobj is the empty bpobj (our sentinel value), we close and reopen it. Between these two operations, it is possible for the dsl_deadlist_space_range() thread to dereference that bpobj which is NULL during that window. Threads should hold the a deadlist's dl_lock when they manipulate its internal data so scenarios like the one above are avoided. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #5762
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