With the opts=1 parameter to the scsi_debug driver each SCSI command cbd is printed out when it is received. The sequence at SCSI commands at device attachment time always seemed a bit bloated but things have got worse in lk 4.15.0-rc3 . What seems to be to be new is the three repeated sequence involving the "a3 0c" command. That is REPORT SUPPORTED OPERATION CODES. Why is the same sequence repeated 3 times? Some of the bloat is self inflicted because the scsi_debug drive suggests that it is a SATL so some ATA pass-through commands are sent and rejected. Doug Gilbert
scsi host0: scsi_debug: version 1.86 [20160430] dev_size_mb=8, opts=0x1, submit_queues=1, statistics=0 scsi_debug:scsi_debug_init: built 1 host(s) scsi_debug:scsi_debug_slave_alloc: slave_alloc <0 0 0 0> scsi 0:0:0:0: scsi_debug: cmd 12 00 00 00 24 00 scsi 0:0:0:0: scsi_debug: cmd 12 00 00 00 60 00 scsi 0:0:0:0: Direct-Access Linux scsi_debug 0186 PQ: 0 ANSI: 7 scsi_debug:scsi_debug_slave_configure: slave_configure <0 0 0 0> scsi 0:0:0:0: scsi_debug: cmd 12 01 00 00 ff 00 scsi 0:0:0:0: scsi_debug: cmd 12 01 80 00 ff 00 scsi 0:0:0:0: scsi_debug: cmd 12 01 83 00 ff 00 scsi 0:0:0:0: scsi_debug: cmd a0 00 00 00 00 00 00 00 10 00 00 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: [sense_key,asc,ascq]: [0x6,0x29,0x0] sd 0:0:0:0: scsi_debug reports: Unit attention: power on reset sd 0:0:0:0: schedule_resp: non-zero result=0x8000002 sd 0:0:0:0: Power-on or device reset occurred sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 9e 10 00 00 00 00 00 00 00 00 00 00 00 20 00 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b0 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b1 00 40 00 sd 0:0:0:0: [sda] 4194304 512-byte logical blocks: (2.15 GB/2.00 GiB) sd 0:0:0:0: scsi_debug: cmd 1a 00 3f 00 04 00 sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 73 00 10 08 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 04 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 20 00 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, supports DPO and FUA sd 0:0:0:0: scsi_debug: cmd a3 0c 01 12 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 93 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 41 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 9e 10 00 00 00 00 00 00 00 00 00 00 00 20 00 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b0 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b1 00 40 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 3f 00 04 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 04 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 20 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 12 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 93 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 41 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 9e 10 00 00 00 00 00 00 00 00 00 00 00 20 00 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b0 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 40 00 sd 0:0:0:0: scsi_debug: cmd 12 01 b1 00 40 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 3f 00 04 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 04 00 sd 0:0:0:0: scsi_debug: cmd 1a 00 08 00 20 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 12 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 93 00 00 00 00 02 00 00 00 sd 0:0:0:0: scsi_debug: cmd a3 0c 01 41 00 00 00 00 02 00 00 00 sd 0:0:0:0: [sda] Attached SCSI disk sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: Attached scsi generic sg0 type 0 sd 0:0:0:0: scsi_debug: cmd 12 00 00 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 12 01 80 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 12 01 83 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug_ioctl: CDROM_GET_CAPABILITY [0x5331] sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 80 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff f0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 08 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff f8 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe f8 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff c0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 70 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd b0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 58 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 20 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 70 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 30 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 20 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 48 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f f3 f0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 08 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 18 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 38 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 78 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 10 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 20 00 00 18 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 40 00 00 38 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 80 00 01 80 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 02 00 00 02 00 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 00 00 00 20 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 28 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 38 00 00 10 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 50 00 00 20 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 78 00 00 a8 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 28 00 00 30 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 60 00 00 50 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd b8 00 00 48 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 00 00 00 70 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 78 00 00 80 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 08 00 00 78 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 88 00 00 38 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff c8 00 00 28 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 10 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 85 06 20 00 05 00 fe 00 00 00 00 00 00 40 ef 00 sd 0:0:0:0: scsi_debug: [sense_key,asc,ascq]: [0x5,0x20,0x0] sd 0:0:0:0: schedule_resp: non-zero result=0x8000002 sd 0:0:0:0: scsi_debug: cmd 85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00 sd 0:0:0:0: scsi_debug: [sense_key,asc,ascq]: [0x5,0x20,0x0] sd 0:0:0:0: schedule_resp: non-zero result=0x8000002 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 12 00 00 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 12 01 00 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 12 01 80 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 12 01 83 00 fe 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug_ioctl: CDROM_GET_CAPABILITY [0x5331] sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 80 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff f0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 08 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff f8 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe f8 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff c0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 70 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd b0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 58 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 20 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 70 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 30 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 20 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 48 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f f3 f0 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 08 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 18 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 38 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 78 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 10 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 20 00 00 18 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 40 00 00 38 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 00 80 00 01 80 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 02 00 00 02 00 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 00 00 00 20 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 28 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 38 00 00 10 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 50 00 00 20 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fc 78 00 00 a8 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 28 00 00 30 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd 60 00 00 50 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fd b8 00 00 48 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 00 00 00 70 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f fe 78 00 00 80 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 08 00 00 78 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff 88 00 00 38 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 3f ff c8 00 00 28 00 sd 0:0:0:0: scsi_debug: cmd 28 00 00 00 10 00 00 00 08 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00 sd 0:0:0:0: scsi_debug: cmd 00 00 00 00 00 00
