Reboot with "task scsi_eh_2:6101 blocked for more than 120 seconds" message

[jbchoi]

We developed own carrier board with four USB to SATA port through USB HUB.
We tested the own carrier board with flash NANO board (no SD Card).
We encountered below message and NANO auto rebooted.
What is the mean of the message.
How can I prevent message and auto reboot?
I can send whole message if you want.

8월 16 01:57:52 jetson10-desktop kernel: INFO: task scsi_eh_2:6101 blocked for more than 120 seconds.
8월 16 01:57:52 jetson10-desktop kernel: Tainted: G W O 4.9.140-tegra #1
8월 16 01:57:52 jetson10-desktop kernel: “echo 0 > /proc/sys/kernel/hung_task_timeout_secs” disables this message.
8월 16 01:57:52 jetson10-desktop kernel: sd 3:0:0:0: tag#0 sense submit err -19 uas-tag 1 inflight: s-st a-cmd s-cmd
8월 16 01:57:52 jetson10-desktop kernel: sd 3:0:0:0: tag#0 CDB: opcode=0x0 00 00 00 00 00 00
8월 16 01:57:52 jetson10-desktop kernel: scsi_eh_2 D 0 6101 2 0x00000000
8월 16 01:57:52 jetson10-desktop kernel: Call trace:
8월 16 01:57:52 jetson10-desktop kernel: [] __switch_to+0x9c/0xc0
8월 16 01:57:52 jetson10-desktop kernel: [] __schedule+0x270/0x780
8월 16 01:57:52 jetson10-desktop kernel: [] schedule+0x40/0xa8
8월 16 01:57:52 jetson10-desktop kernel: [] wb_wait_for_completion+0x58/0x88
8월 16 01:57:52 jetson10-desktop kernel: [] __writeback_inodes_sb_nr+0xac/0xc8
8월 16 01:57:52 jetson10-desktop kernel: [] writeback_inodes_sb+0x34/0x40
8월 16 01:57:52 jetson10-desktop kernel: [] sync_filesystem+0x44/0xb0
8월 16 01:57:52 jetson10-desktop kernel: [] fsync_bdev+0x58/0x78
8월 16 01:57:52 jetson10-desktop kernel: [] invalidate_partition+0x38/0x60
8월 16 01:57:52 jetson10-desktop kernel: [] del_gendisk+0xe8/0x1e8
8월 16 01:57:52 jetson10-desktop kernel: [] sd_remove+0x64/0xc0
8월 16 01:57:52 jetson10-desktop kernel: [] __device_release_driver+0x9c/0x118
8월 16 01:57:52 jetson10-desktop kernel: [] device_release_driver+0x2c/0x40
8월 16 01:57:52 jetson10-desktop kernel: [] bus_remove_device+0xec/0x190
8월 16 01:57:52 jetson10-desktop kernel: [] device_del+0x110/0x248
8월 16 01:57:52 jetson10-desktop kernel: [] __scsi_remove_device+0xdc/0xe0
8월 16 01:57:52 jetson10-desktop kernel: [] scsi_forget_host+0x2c/0x78
8월 16 01:57:52 jetson10-desktop kernel: [] scsi_remove_host+0x78/0x130
8월 16 01:57:52 jetson10-desktop kernel: [] uas_disconnect+0x84/0xa8
8월 16 01:57:52 jetson10-desktop kernel: [] usb_unbind_interface+0x74/0x2a0
8월 16 01:57:52 jetson10-desktop kernel: [] __device_release_driver+0x9c/0x118
8월 16 01:57:52 jetson10-desktop kernel: [] device_release_driver+0x2c/0x40
8월 16 01:57:52 jetson10-desktop kernel: [] usb_driver_release_interface+0x90/0x98
8월 16 01:57:52 jetson10-desktop kernel: [] usb_forced_unbind_intf+0x30/0x68
8월 16 01:57:52 jetson10-desktop kernel: [] unbind_marked_interfaces.isra.7+0x5c/0x78
8월 16 01:57:52 jetson10-desktop kernel: [] usb_unbind_and_rebind_marked_interfaces+0x20/0x38
8월 16 01:57:52 jetson10-desktop kernel: [] usb_reset_device+0x184/0x290
8월 16 01:57:52 jetson10-desktop kernel: [] uas_eh_bus_reset_handler+0xbc/0x1a0
8월 16 01:57:52 jetson10-desktop kernel: [] scsi_try_bus_reset+0x38/0xe0
8월 16 01:57:52 jetson10-desktop kernel: [] scsi_eh_ready_devs+0x5b0/0x838
8월 16 01:57:52 jetson10-desktop kernel: [] scsi_error_handler+0x4b0/0x4c0
8월 16 01:57:52 jetson10-desktop kernel: [] kthread+0xec/0xf0
8월 16 01:57:52 jetson10-desktop kernel: [] ret_from_fork+0x10/0x30
8월 16 01:57:52 jetson10-desktop kernel: Kernel panic - not syncing: hung_task: blocked tasks

[mike_nv]

@jbchoi

We provide a checklist for the bring-up of a new carrier board. Please see the link for the hardware and software checklist below:

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fadaptation_and_bringup_checklists.html%23

Please make sure your have validated your design against this list and it will help you debug your issue.