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In the commit of the head_errlog feature we introduced a bug in dsl_dataset_promote_sync(): we may dereference origin_head and hds, both dereferencing ddpa after calling promote_sync() on ddpa. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Chunwei Chen <david.chen@nutanix.com> Reviewed-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: George Amanakis <gamanakis@gmail.com> Closes #16272 Closes #16273