00:18:21.488  ========== Backtrace start: ==========
00:18:21.488  
00:18:21.488  in /home/vagrant/spdk_repo/spdk/test/common/autotest_common.sh:588 -> rpc_cmd(["ublk_recover_disk"],["malloc0"],["1"])
00:18:21.488       ...
00:18:21.488     583 			echo "$rsp"
00:18:21.488     584 		done
00:18:21.488     585 	
00:18:21.488     586 		rc=${!status[*]}
00:18:21.488     587 		xtrace_restore
00:18:21.488  => 588 		[[ $rc == 0 ]]
00:18:21.488     589 	}
00:18:21.488     590 	
00:18:21.488     591 	function rpc_cmd_simple_data_json() {
00:18:21.488     592 	
00:18:21.488     593 		local elems="$1[@]" elem
00:18:21.488       ...
00:18:21.488  in /home/vagrant/spdk_repo/spdk/test/ublk/ublk_recovery.sh:49 -> main([])
00:18:21.488       ...
00:18:21.488     44  	waitforlisten $spdk_pid
00:18:21.488     45  	
00:18:21.488     46  	# send recovery command to `ublk_drv`
00:18:21.488     47  	rpc_cmd ublk_create_target
00:18:21.488     48  	rpc_cmd bdev_malloc_create -b malloc0 64 4096
00:18:21.488  => 49  	rpc_cmd ublk_recover_disk malloc0 1
00:18:21.488     50  	
00:18:21.488     51  	# wait for `fio` exit
00:18:21.488     52  	wait $fio_proc
00:18:21.489     53  	
00:18:21.489     54  	# cleanup and exit
00:18:21.489       ...
00:18:21.489  
00:18:21.489  ========== Backtrace end ==========