This is getting interesting:
[root@orange ~]# mtx -f /dev/changer status
Warning:Too Many Storage Elements Reported (expected 0, now have 1
Too many Data Transfer Elements Reported
(and tgtd keeps running) and here is its output:
tgtd: tgt_device_create(436) 1 4
tgtd: bs_thread_worker_fn(189) started this thread
tgtd: bs_thread_worker_fn(189) started this thread
tgtd: bs_thread_worker_fn(189) started this thread
tgtd: bs_thread_worker_fn(189) started this thread
tgtd: tgt_device_create(558) Add a logical unit 4 to the target 1
tgtd: tgt_mgmt(336) 150 0 2 5 1 0 4 targetOps scsi_sn=123:456:789:000, 2491
tgtd: tgt_mgmt(336) 140 0 2 5 1 0 4 targetOps vendor_id=STK, 2491
tgtd: tgt_mgmt(336) 143 0 2 5 1 0 4 targetOps product_rev=0001, 2491
tgtd: tgt_mgmt(336) 192 0 2 5 1 0 4 targetOps
element_type=1,start_address=1,quantity=1,media_home=/root/btapes, 2491
tgtd: tgt_mgmt(336) 196 0 2 5 1 0 4 targetOps
element_type=2,start_address=1000,quantity=24,media_home=/root/btapes, 2491
tgtd: tgt_mgmt(336) 193 0 2 5 1 0 4 targetOps
element_type=3,start_address=10,quantity=5,media_home=/root/btapes, 2491
tgtd: tgt_mgmt(336) 194 0 2 5 1 0 4 targetOps
element_type=4,start_address=500,quantity=3,media_home=/root/btapes, 2491
tgtd: tgt_mgmt(336) 165 0 2 5 1 0 4 targetOps
element_type=4,address=500,tid=1,lun=1, 2491
tgtd: tgt_mgmt(336) 165 0 2 5 1 0 4 targetOps
element_type=4,address=500,tid=1,lun=2, 2491
tgtd: tgt_mgmt(336) 165 0 2 5 1 0 4 targetOps
element_type=4,address=500,tid=1,lun=3, 2491
tgtd: tgt_mgmt(336) 138 0 2 5 1 0 4 targetOps removable=1, 2491
tgtd: tgt_mgmt(336) 142 0 2 5 1 0 4 targetOps product_id=L700, 2491
tgtd: tgt_mgmt(336) 142 0 2 5 1 0 4 targetOps mode_page=0:0:0, 2491
tgtd: tgt_mgmt(336) 182 0 2 5 1 0 4 targetOps
mode_page=0x02:0:14:0x80:0x80:0:0xa:0:0:0:0:0:0:0:0:0:0, 2491
tgtd: tgt_mgmt(336) 182 0 2 5 1 0 4 targetOps
mode_page=0x1a:0:18:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0, 2491
tgtd: tgt_mgmt(336) 166 0 2 5 1 0 4 targetOps
mode_page=0x1c:0:10:8:0:0:0:0:0:0:0:0:0, 2491
tgtd: tgt_mgmt(336) 184 0 2 5 1 0 4 targetOps
mode_page=0x1d:0:0x12:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0, 2491
tgtd: tgt_mgmt(336) 149 0 2 5 1 0 4 targetOps mode_page=0x1e:0:2:0:0, 2491
tgtd: tgt_mgmt(336) 211 0 2 5 1 0 4 targetOps
mode_page=0x1f:0:0x12:0x0f:7:0x0f:0x0f:0x0f:0x0f:0:0:0:0:0x0f:0x0f:0x0f:0x0f:0:0:0:0,
2491
tgtd: tgt_mgmt(336) 137 0 1 3 1 0 ffffffffffffffff initiator-address=ALL
2491
tgtd: tgt_mgmt(336) 116 0 1 2 -1 0 ffffffffffffffff 2491
tgtd: tgt_mgmt(336) 116 0 1 2 -1 0 ffffffffffffffff 2491
tgtd: accept_connection(99) 4
tgtd: cmnd_exec_login(685) Login request (operational negotiation): 0
tgtd: login_start(523) exp_cmd_sn: 0,0
tgtd: it_nexus_create(244) 1 1 0
tgtd: session_create(135) session_create: 0x10000013d0200
tgtd: conn_take_fd(211) 0 1 0 10000013d0200
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 36 1 1
tgtd: iscsi_task_queue(1512) 0 0 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 0
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 0 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 1 12 (nil) 0x8f3f000 0 0 36 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 36
tgtd: iscsi_task_tx_start(1858) found a task 1 36 0 0
tgtd: iscsi_data_rsp_build(1050) 36 36 36 81921
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 36 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 68 1 2
tgtd: iscsi_task_queue(1512) 1 1 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 0
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 0 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 2 12 (nil) 0x8f3f000 0 0 66 0 0
tgtd: iscsi_task_tx_start(1858) found a task 2 66 0 0
tgtd: iscsi_data_rsp_build(1050) 66 66 66 81922
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 66 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 a0 0 0 4096 1 3
tgtd: iscsi_task_queue(1512) 2 2 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 a0 0
tgtd: target_cmd_queue(862) 0x8f3e8f0 a0 0 1
tgtd: target_cmd_queue(873) 3 a0 (nil) 0x8f3f000 0 0 4096 0 0
tgtd: iscsi_task_tx_start(1858) found a task 3 4096 0 0
tgtd: iscsi_data_rsp_build(1050) 48 4096 48 81923
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 4096 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 36 1 4
tgtd: iscsi_task_queue(1512) 3 3 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 1
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 1 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 4 12 (nil) 0x8f3f000 0 0 36 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 36
tgtd: iscsi_task_tx_start(1858) found a task 4 36 0 0
tgtd: iscsi_data_rsp_build(1050) 36 36 36 81924
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 36 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 68 1 5
tgtd: iscsi_task_queue(1512) 4 4 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 1
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 1 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 5 12 (nil) 0x8f3f000 0 0 66 0 0
tgtd: iscsi_task_tx_start(1858) found a task 5 66 0 0
tgtd: iscsi_data_rsp_build(1050) 66 66 66 81925
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 66 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 36 1 6
tgtd: iscsi_task_queue(1512) 5 5 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 2
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 2 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 6 12 (nil) 0x8f3f000 0 0 36 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 36
tgtd: iscsi_task_tx_start(1858) found a task 6 36 0 0
tgtd: iscsi_data_rsp_build(1050) 36 36 36 81926
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 36 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 68 1 7
tgtd: iscsi_task_queue(1512) 6 6 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 2
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 2 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 7 12 (nil) 0x8f3f000 0 0 66 0 0
tgtd: iscsi_task_tx_start(1858) found a task 7 66 0 0
tgtd: iscsi_data_rsp_build(1050) 66 66 66 81927
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 66 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 36 1 8
tgtd: iscsi_task_queue(1512) 7 7 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 3
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 3 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 8 12 (nil) 0x8f3f000 0 0 36 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 36
tgtd: iscsi_task_tx_start(1858) found a task 8 36 0 0
tgtd: iscsi_data_rsp_build(1050) 36 36 36 81928
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 36 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 68 1 9
tgtd: iscsi_task_queue(1512) 8 8 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 3
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 3 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 9 12 (nil) 0x8f3f000 0 0 66 0 0
tgtd: iscsi_task_tx_start(1858) found a task 9 66 0 0
tgtd: iscsi_data_rsp_build(1050) 66 66 66 81929
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 66 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 36 1 a
tgtd: iscsi_task_queue(1512) 9 9 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 4
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 4 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) a 12 (nil) 0x8f3f000 0 0 36 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 36
tgtd: iscsi_task_tx_start(1858) found a task a 36 0 0
tgtd: iscsi_data_rsp_build(1050) 36 36 36 8192a
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 36 0
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 68 1 b
tgtd: iscsi_task_queue(1512) a a 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 12 4
tgtd: target_cmd_queue(862) 0x8f3e8f0 12 4 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) b 12 (nil) 0x8f3f000 0 0 66 0 0
tgtd: iscsi_task_tx_start(1858) found a task b 66 0 0
tgtd: iscsi_data_rsp_build(1050) 66 66 66 8192b
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 66 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 1a 0 0 256 1 c
tgtd: iscsi_task_queue(1512) b b 1
tgtd: target_cmd_queue(843) 0x8f3e8f0 1a 4
tgtd: target_cmd_queue(862) 0x8f3e8f0 1a 4 1
tgtd: target_cmd_queue(873) c 1a (nil) 0x8f3f000 0 0 255 2 0
tgtd: iscsi_task_tx_start(1858) found a task c 255 0 0
tgtd: iscsi_data_rsp_build(1050) 255 255 255 8192c
tgtd: iscsi_scsi_cmd_tx_done(1806) more data or sense or bidir c
tgtd: iscsi_task_tx_start(1858) found a task c 255 255 0
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 255 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 1a 0 0 256 1 d
tgtd: iscsi_task_queue(1512) c c 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 1a 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 1a 4 1
tgtd: target_cmd_queue(873) d 1a (nil) 0x8f3f000 0 0 255 0 0
tgtd: iscsi_task_tx_start(1858) found a task d 255 0 0
tgtd: iscsi_data_rsp_build(1050) 32 255 32 8192d
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 255 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 7 0 0 0 1 e
tgtd: iscsi_task_queue(1512) d d 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 7 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 7 4 1
tgtd: target_cmd_queue(873) e 7 (nil) (nil) 0 0 0 0 0
tgtd: iscsi_task_tx_start(1858) found a task e 0 0 0
tgtd: __cmd_done(934) 0 (nil) (nil) 0 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 f
tgtd: iscsi_task_queue(1512) e e 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 4 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) f 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task f 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 8192f
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 10
tgtd: iscsi_task_queue(1512) f f 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 4 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 10 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 10 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 819210
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 11
tgtd: iscsi_task_queue(1512) 10 10 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 4 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 11 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 11 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 819211
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 12
tgtd: iscsi_task_queue(1512) 11 11 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 12 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 12 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819212
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 13
tgtd: iscsi_task_queue(1512) 12 12 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 13 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 13 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819213
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 14
tgtd: iscsi_task_queue(1512) 13 13 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 14 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 14 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819214
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 15
tgtd: iscsi_task_queue(1512) 14 14 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 15 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 15 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819215
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 16
tgtd: iscsi_task_queue(1512) 15 15 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 16 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 16 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819216
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 17
tgtd: iscsi_task_queue(1512) 16 16 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 17 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 17 254 0 0
tgtd: iscsi_data_rsp_build(1050) 66 254 66 819217
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 18
tgtd: iscsi_task_queue(1512) 17 17 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 18 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 18 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 819218
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 19
tgtd: iscsi_task_queue(1512) 18 18 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 19 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 19 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 819219
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1a
tgtd: iscsi_task_queue(1512) 19 19 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 1a 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1a 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 81921a
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1b
tgtd: iscsi_task_queue(1512) 1a 1a 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 1
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 1 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 1b 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1b 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 81921b
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1c
tgtd: iscsi_task_queue(1512) 1b 1b 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 1c 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1c 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 81921c
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1d
tgtd: iscsi_task_queue(1512) 1c 1c 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 1d 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1d 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 81921d
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1e
tgtd: iscsi_task_queue(1512) 1d 1d 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 1e 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1e 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 81921e
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 1f
tgtd: iscsi_task_queue(1512) 1e 1e 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 2
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 2 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 1f 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 1f 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 81921f
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 20
tgtd: iscsi_task_queue(1512) 1f 1f 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 20 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 20 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 819220
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 21
tgtd: iscsi_task_queue(1512) 20 20 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 1 0
tgtd: target_cmd_queue(873) 21 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 21 254 0 0
tgtd: iscsi_data_rsp_build(1050) 7 254 7 819221
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 22
tgtd: iscsi_task_queue(1512) 21 21 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 22 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 22 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 819222
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 256 1 23
tgtd: iscsi_task_queue(1512) 22 22 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 3
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 3 1
tgtd: spc_inquiry(164) 1 83
tgtd: target_cmd_queue(873) 23 12 (nil) 0x8f3f000 0 0 254 0 0
tgtd: iscsi_task_tx_start(1858) found a task 23 254 0 0
tgtd: iscsi_data_rsp_build(1050) 32 254 32 819223
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 254 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 24 0
tgtd: iscsi_task_queue(1512) 23 23 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 25 0
tgtd: iscsi_task_queue(1512) 23 23 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 26 0
tgtd: iscsi_task_queue(1512) 23 23 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 27 0
tgtd: iscsi_task_queue(1512) 23 23 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 12 0 0 56 1 28
tgtd: iscsi_task_queue(1512) 23 23 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 12 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 12 4 1
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 28 12 (nil) 0x8f3f000 0 0 56 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66 > 56
tgtd: iscsi_task_tx_start(1858) found a task 28 56 0 0
tgtd: iscsi_data_rsp_build(1050) 56 56 56 819228
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 56 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 1a 0 0 136 1 29
tgtd: iscsi_task_queue(1512) 24 24 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 1a 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 1a 4 1
tgtd: target_cmd_queue(873) 29 1a (nil) 0x8f3f000 0 0 136 0 0
tgtd: iscsi_task_tx_start(1858) found a task 29 136 0 0
tgtd: iscsi_data_rsp_build(1050) 24 136 24 819229
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 136 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 b8 0 0 40 1 2a
tgtd: iscsi_task_queue(1512) 25 25 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 b8 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 b8 4 1
tgtd: smc_read_element_status(372) 40 1256 24
tgtd: target_cmd_queue(873) 2a b8 (nil) 0x8f3f000 0 0 40 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 1256 > 40
tgtd: iscsi_task_tx_start(1858) found a task 2a 40 0 0
tgtd: iscsi_data_rsp_build(1050) 40 40 40 81922a
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 40 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 b8 0 0 1264 1 2b
tgtd: iscsi_task_queue(1512) 26 26 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 b8 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 b8 4 1
tgtd: smc_read_element_status(372) 1264 1256 24
tgtd: target_cmd_queue(873) 2b b8 (nil) 0x8f3f000 0 0 1264 0 0
tgtd: iscsi_task_tx_start(1858) found a task 2b 1264 0 0
tgtd: iscsi_data_rsp_build(1050) 1256 1264 1256 81922b
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 1264 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 b8 0 0 40 1 2c
tgtd: iscsi_task_queue(1512) 27 27 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 b8 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 b8 4 1
tgtd: smc_read_element_status(372) 40 164 3
tgtd: target_cmd_queue(873) 2c b8 (nil) 0x8f3f000 0 0 40 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 164 > 40
tgtd: iscsi_task_tx_start(1858) found a task 2c 40 0 0
tgtd: iscsi_data_rsp_build(1050) 40 40 40 81922c
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 40 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 b8 0 0 172 1 2d
tgtd: iscsi_task_queue(1512) 28 28 1
tgtd: target_cmd_queue(843) 0x8f3e7e0 b8 4
tgtd: target_cmd_queue(862) 0x8f3e7e0 b8 4 1
tgtd: smc_read_element_status(372) 172 164 3
tgtd: target_cmd_queue(873) 2d b8 (nil) 0x8f3f000 0 0 172 0 0
tgtd: iscsi_task_tx_start(1858) found a task 2d 172 0 0
tgtd: iscsi_data_rsp_build(1050) 164 172 164 81922d
tgtd: __cmd_done(934) 0 (nil) 0x8f3f000 0 172 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 2e 0
tgtd: iscsi_task_queue(1512) 29 29 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_noop_out_rx_start(1605) ffffffff 2f 0
tgtd: iscsi_task_queue(1512) 29 29 40
tgtd: iscsi_task_tx_start(1858) found a task 0 4294967295 0 0
tgtd: iscsi_task_tx_start(1883) no more data
On 11/25/2009 04:38 PM, FUJITA Tomonori wrote:
On Wed, 25 Nov 2009 16:34:41 +0100
Albert Pauw<albert.pauw@xxxxxxxxx> wrote:
Please send a log file including tgt's debug message (as you did in
2009/10/28).
Here's the last bit of tgtd -f -d8:
tgtd: spc_inquiry(164) 0 0
tgtd: target_cmd_queue(873) 28 12 (nil) 0x84a1000 0 0 56 0 0
tgtd: iscsi_scsi_cmd_done(1185) shrunk too big device read len 66> 56
tgtd: iscsi_task_tx_start(1858) found a task 28 56 0 0
tgtd: iscsi_data_rsp_build(1050) 56 56 56 819228
tgtd: __cmd_done(934) 0 (nil) 0x84a1000 0 56 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 1a 0 0 136 1 29
tgtd: iscsi_task_queue(1512) 24 24 1
tgtd: target_cmd_queue(843) 0x84a07e0 1a 4
tgtd: target_cmd_queue(862) 0x84a07e0 1a 4 1
tgtd: target_cmd_queue(873) 29 1a (nil) 0x84a1000 0 0 136 0 0
tgtd: iscsi_task_tx_start(1858) found a task 29 136 0 0
tgtd: iscsi_data_rsp_build(1050) 24 136 24 819229
tgtd: __cmd_done(934) 0 (nil) 0x84a1000 0 136 0
tgtd: iscsi_task_tx_start(1883) no more data
tgtd: iscsi_scsi_cmd_rx_start(1567) 1 b8 0 0 40 1 2a
tgtd: iscsi_task_queue(1512) 25 25 1
tgtd: target_cmd_queue(843) 0x84a07e0 b8 4
tgtd: target_cmd_queue(862) 0x84a07e0 b8 4 1
tgtd: smc_read_element_status(372) 40 1256 24
*** glibc detected *** tgtd: double free or corruption (!prev):
0x084a0978 ***
*** glibc detected *** tgtd: malloc(): memory corruption: 0x084a0c00 ***
Try this instead of the previous:
diff --git a/usr/smc.c b/usr/smc.c
index 6430882..0e0d4d2 100644
--- a/usr/smc.c
+++ b/usr/smc.c
@@ -304,7 +304,7 @@ static int smc_read_element_status(int host_no, struct scsi_cmd *cmd)
}
}
- data = zalloc(alloc_len);
+ data = zalloc(8192);
if (!data) {
dprintf("Can't allocate enough memory for cmd\n");
key = HARDWARE_ERROR;
@@ -369,6 +369,7 @@ static int smc_read_element_status(int host_no, struct scsi_cmd *cmd)
/* Lastly, fill in data header */
len = element_status_data_hdr(data, dvcid, voltag, first, count);
+ eprintf("%d %d %d\n", alloc_len, len, count);
memcpy(scsi_get_in_buffer(cmd), data, min(len, alloc_len));
scsi_set_in_resid_by_actual(cmd, len);
free(data);
--
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