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1305d33a4b
Callers of zap_deref_leaf() must be careful to drop leaf->l_rwlock since that function returns with the lock held on success. All other callers drop the lock correctly but it seems fzap_cursor_move_to_key() does not. This may block writers or cause VERIFY failures when the lock is freed. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1215 Closes zfsonlinux/spl#143 Closes zfsonlinux/spl#97