Artem, > rdac_failover_get references struct rdac_controller as > ctlr->ms_sdev->handler_data->ctlr for no apparent reason. Besides being > inefficient this also introduces a null-pointer dereference as > send_mode_select() sets ctlr->ms_sdev to NULL before calling > rdac_failover_get(): Applied to 4.12/scsi-fixes. Thank you! -- Martin K. Petersen Oracle Linux Engineering