I met a USB drive issue on Am335x platform with the latest SDK06.03, A 3G/4G modem is connected to the board，the system is frozen and only just The console port keeps printing error logs when reboot the USB modem while it is working, the following is the operation process and logs on console port（but on SDK8 kernel3.14 it just pops up some errors and then system works ok）:
====================== kernel-4.19 logs========================
[ 48.237780] usb 1-1.1: new high-speed USB device number 3 using musb-hdrc
[ 48.380838] usb 1-1.1: New USB device found, idVendor=19d2, idProduct=1476, bcdDevice= 3.18
[ 48.389766] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 48.397568] usb 1-1.1: Product: Android
[ 48.402767] usb 1-1.1: Manufacturer: Android
[ 48.407405] usb 1-1.1: SerialNumber: 7a03092b
[ 48.420557] option 1-1.1:1.0: GSM modem (1-port) converter detected
[ 48.428886] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 48.437541] option 1-1.1:1.1: GSM modem (1-port) converter detected
[ 48.445678] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 48.454823] option 1-1.1:1.2: GSM modem (1-port) converter detected
[ 48.462908] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 48.476787] cdc_ether 1-1.1:1.3 usb0: register 'cdc_ether' at usb-musb-hdrc.0-1.1, ZTE CDC Ethernet Device, be:8f:6e:a2:98:94
cat /dev/ttyUSB2 // 1. keep operating the USB Modem
echo "AT+ZRST" > /dev/ttyUSB2 // 2. SW rebooting or power off the USB Modem during reading it
[ 120.777935] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 120.784040] rcu: 0-...!: (2030 ticks this GP) idle=9aa/1/0x40000002 softirq=4437/4437 fqs=0
[ 120.792970] rcu: (t=2100 jiffies g=4713 q=3)
[ 120.797652] rcu: rcu_preempt kthread starved for 2030 jiffies! g4713 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
[ 120.808488] rcu: RCU grace-period kthread stack dump:
[ 120.813784] rcu_preempt I 0 10 2 0x00000000
[ 120.819544] Backtrace:
[ 120.822158] [<c0965760>] (__schedule) from [<c0965fc8>] (schedule+0x54/0xc4)
[ 120.829564] r10:c0e14f00 r9:00000005 r8:ffffb20e r7:c0e16020 r6:c0e14f00 r5:dc07df00
[ 120.837767] r4:ffffb20f
[ 120.840448] [<c0965f74>] (schedule) from [<c09697b8>] (schedule_timeout+0x15c/0x248)
[ 120.848595] [<c096965c>] (schedule_timeout) from [<c017c54c>] (rcu_gp_kthread+0x5cc/0xd00)
[ 120.857269] r10:00000001 r8:00000001 r7:c0e14a5c r6:c0e03104 r5:c0e16020 r4:c0e14b2c
[ 120.865495] [<c017bf80>] (rcu_gp_kthread) from [<c01483e8>] (kthread+0x118/0x150)
[ 120.873335] r7:dc02ec98
[ 120.876009] [<c01482d0>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 120.883579] Exception stack(0xdc07dfb0 to 0xdc07dff8)
[ 120.888884] dfa0: 00000000 00000000 00000000 00000000
[ 120.897467] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 120.906046] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 120.912990] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c01482d0
[ 120.921196] r4:dc02ec00 r3:ffffffff
[ 120.924964] Task dump for CPU 0:
[ 120.928349] sshd R running task 0 753 558 0x00000002
[ 120.935746] Backtrace:
[ 120.938334] [<c010c430>] (dump_backtrace) from [<c010c698>] (show_stack+0x18/0x1c)
[ 120.946276] r6:800f0193 r5:0000022e r4:db7e6a00 r3:9edc7db7
[ 120.952226] [<c010c680>] (show_stack) from [<c014dd28>] (sched_show_task+0xc4/0xf8)
[ 120.960271] [<c014dc64>] (sched_show_task) from [<c0152120>] (dump_cpu_task+0x2c/0x30)
[ 120.968569] r5:c0e14a5c r4:00000000
[ 120.972341] [<c01520f4>] (dump_cpu_task) from [<c017ede0>] (rcu_dump_cpu_stacks+0x70/0xd0)
[ 120.981021] [<c017ed70>] (rcu_dump_cpu_stacks) from [<c017e408>] (rcu_check_callbacks+0x5b0/0x8d0)
[ 120.990423] r10:c0e14e7c r8:c0e030f8 r7:00000000 r6:c0e14a5c r5:c0e14a5c r4:c0e1486c
[ 120.998657] [<c017de58>] (rcu_check_callbacks) from [<c0183b8c>] (update_process_times+0x38/0x64)
[ 121.007968] r10:c0193000 r9:c0e169c0 r8:00000000 r7:db20dea8 r6:c0e169c0 r5:00000000
[ 121.016172] r4:db7e6a00
[ 121.018862] [<c0183b54>] (update_process_times) from [<c0192d6c>] (tick_sched_handle+0x5c/0x60)
[ 121.027977] r5:0000001c r4:1ddf6c77
[ 121.031747] [<c0192d10>] (tick_sched_handle) from [<c019304c>] (tick_sched_timer+0x4c/0xa0)
[ 121.040518] [<c0193000>] (tick_sched_timer) from [<c0184918>] (__hrtimer_run_queues.constprop.2+0x150/0x1f8)
[ 121.050821] r7:200f0193 r6:c0e160c0 r5:0000001c r4:1ddf5fee
[ 121.056773] [<c01847c8>] (__hrtimer_run_queues.constprop.2) from [<c0184dd8>] (hrtimer_interrupt+0x118/0x304)
[ 121.067175] r10:00000003 r9:7fffffff r8:c0e16080 r7:200f0193 r6:c0e16080 r5:00000003
[ 121.075377] r4:ffffffff
[ 121.078073] [<c0184cc0>] (hrtimer_interrupt) from [<c011a104>] (omap2_gp_timer_interrupt+0x30/0x38)
[ 121.087565] r10:c0e4f7f7 r9:db20c000 r8:dc007100 r7:00000010 r6:db20de0c r5:00000000
[ 121.095767] r4:c0e08380
[ 121.098454] [<c011a0d4>] (omap2_gp_timer_interrupt) from [<c016ca60>] (__handle_irq_event_percpu+0x5c/0x154)
[ 121.108768] [<c016ca04>] (__handle_irq_event_percpu) from [<c016cb7c>] (handle_irq_event_percpu+0x24/0x60)
[ 121.118896] r10:00000488 r9:db20c000 r8:dc008000 r7:00000000 r6:00000000 r5:dc007100
[ 121.127099] r4:dc007100
[ 121.129774] [<c016cb58>] (handle_irq_event_percpu) from [<c016cc1c>] (handle_irq_event+0x64/0x90)
[ 121.139071] r5:c0e4ea04 r4:dc007100
[ 121.142842] [<c016cbb8>] (handle_irq_event) from [<c0170630>] (handle_level_irq+0xbc/0x14c)
[ 121.151595] r4:dc007100 r3:c0e0f3e8
[ 121.155362] [<c0170574>] (handle_level_irq) from [<c016c268>] (generic_handle_irq+0x20/0x30)
[ 121.164205] r4:00000010 r3:c0170574
[ 121.167969] [<c016c248>] (generic_handle_irq) from [<c016c38c>] (__handle_domain_irq+0x54/0xac)
[ 121.177104] [<c016c338>] (__handle_domain_irq) from [<c0441894>] (omap_intc_handle_irq+0x38/0x98)
[ 121.186415] r8:db7e6a00 r7:db20dedc r6:ffffffff r5:600f0113 r4:c0ea2bb8 r3:db20dea8
[ 121.194542] [<c044185c>] (omap_intc_handle_irq) from [<c0101a0c>] (__irq_svc+0x6c/0xa8)
[ 121.202929] Exception stack(0xdb20dea8 to 0xdb20def0)
[ 121.208237] dea0: db7b0600 00000002 db20def8 db20c000 00000000 00000000
[ 121.216820] dec0: db7b0600 c0965a60 db7e6a00 c0965fc8 00000488 db20df2c db20df30 db20def8
[ 121.225394] dee0: c0965a60 c014e358 600f0113 ffffffff
[ 121.230692] r4:c014e358 r3:c0965a60
[ 121.234456] [<c014e300>] (finish_task_switch) from [<c0965a60>] (__schedule+0x300/0x710)
[ 121.242947] r10:00000488 r8:db7b0600 r7:db7e6a00 r6:c0e0ee80 r5:db558c40 r4:db699a80
[ 121.251164] [<c0965760>] (__schedule) from [<c0965fc8>] (schedule+0x54/0xc4)
[ 121.258565] r10:0005af68 r9:db20c000 r8:00000000 r7:10c5387d r6:ffffffff r5:00000000
[ 121.266767] r4:db20dfb0
[ 121.269438] [<c0965f74>] (schedule) from [<c010b6c8>] (do_work_pending+0x20/0xf0)
[ 121.277291] [<c010b6a8>] (do_work_pending) from [<c010106c>] (slow_work_pending+0xc/0x20)
[ 121.285858] Exception stack(0xdb20dfb0 to 0xdb20dff8)
[ 121.291162] dfa0: 0006e85c bec79114 0006e768 00000099
[ 121.299745] dfc0: 00000067 00000000 00000010 0006e85c 0006951f 0006a528 0005af68 0006e768
[ 121.308323] dfe0: 0005a58c bec79110 0002e1d9 b6e44760 60010030 ffffffff
[ 121.315257] r5:60010030 r4:b6e44760
am335x-immu2-a02 [ 183.829236] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 183.838526] rcu: (detected by 0, t=8405 jiffies, g=4713, q=9)
[ 183.847451] rcu: All QSes seen, last rcu_preempt kthread activity 6001 (-11619--17620), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 183.864548] kworker/0:2 R running task 0 51 2 0x00000002
[ 183.875429] Workqueue: events dbs_work_handler
[ 183.882098] Backtrace:
[ 183.886146] [<c010c430>] (dump_backtrace) from [<c010c698>] (show_stack+0x18/0x1c)
[ 183.897425] r6:c0e14a5c r5:00000002 r4:dc29ea00 r3:05b6e34a
[ 183.905997] [<c010c680>] (show_stack) from [<c014dd28>] (sched_show_task+0xc4/0xf8)
[ 183.917530] [<c014dc64>] (sched_show_task) from [<c017e5e4>] (rcu_check_callbacks+0x78c/0x8d0)
[ 183.930198] r5:c0e14a5c r4:c0e1486c
[ 183.935869] [<c017de58>] (rcu_check_callbacks) from [<c0183b8c>] (update_process_times+0x38/0x64)
[ 183.949064] r10:c0193000 r9:c0e169c0 r8:00000000 r7:dc733c48 r6:c0e169c0 r5:00000000
[ 183.960552] r4:dc29ea00
[ 183.964712] [<c0183b54>] (update_process_times) from [<c0192d6c>] (tick_sched_handle+0x5c/0x60)
[ 183.977499] r5:0000002a r4:cc02cc3e
[ 183.983123] [<c0192d10>] (tick_sched_handle) from [<c019304c>] (tick_sched_timer+0x4c/0xa0)
[ 183.995633] [<c0193000>] (tick_sched_timer) from [<c0184918>] (__hrtimer_run_queues.constprop.2+0x150/0x1f8)
[ 184.010116] r7:20000193 r6:c0e160c0 r5:0000002a r4:cc02699c
[ 184.018739] [<c01847c8>] (__hrtimer_run_queues.constprop.2) from [<c0184dd8>] (hrtimer_interrupt+0x118/0x304)
[ 184.033428] r10:00000003 r9:7fffffff r8:c0e16080 r7:20000193 r6:c0e16080 r5:00000003
[ 184.044915] r4:ffffffff
[ 184.049134] [<c0184cc0>] (hrtimer_interrupt) from [<c011a104>] (omap2_gp_timer_interrupt+0x30/0x38)
[ 184.062581] r10:c0e4f7f7 r9:dc732000 r8:dc007100 r7:00000010 r6:dc733bac r5:00000000
[ 184.074063] r4:c0e08380
[ 184.078233] [<c011a0d4>] (omap2_gp_timer_interrupt) from [<c016ca60>] (__handle_irq_event_percpu+0x5c/0x154)
[ 184.092818] [<c016ca04>] (__handle_irq_event_percpu) from [<c016cb7c>] (handle_irq_event_percpu+0x24/0x60)
[ 184.107127] r10:00000000 r9:dc732000 r8:dc008000 r7:00000000 r6:00000000 r5:dc007100
[ 184.118610] r4:dc007100
[ 184.122707] [<c016cb58>] (handle_irq_event_percpu) from [<c016cc1c>] (handle_irq_event+0x64/0x90)
[ 184.135736] r5:c0e4ea04 r4:dc007100
[ 184.141360] [<c016cbb8>] (handle_irq_event) from [<c0170630>] (handle_level_irq+0xbc/0x14c)
[ 184.153650] r4:dc007100 r3:c0e0f3e8
[ 184.159246] [<c0170574>] (handle_level_irq) from [<c016c268>] (generic_handle_irq+0x20/0x30)
[ 184.171655] r4:00000010 r3:c0170574
[ 184.177231] [<c016c248>] (generic_handle_irq) from [<c016c38c>] (__handle_domain_irq+0x54/0xac)
[ 184.190200] [<c016c338>] (__handle_domain_irq) from [<c0441894>] (omap_intc_handle_irq+0x38/0x98)
[ 184.203388] r8:c0101a24 r7:dc733c7c r6:ffffffff r5:20000113 r4:c0ea2bb8 r3:dc733c48
[ 184.214947] [<c044185c>] (omap_intc_handle_irq) from [<c0101a0c>] (__irq_svc+0x6c/0xa8)
[ 184.226715] Exception stack(0xdc733c48 to 0xdc733c90)
[ 184.234402] 3c40: 00000001 dc29ea00 00000001 dc732000 c04ae3b8 a0000113
[ 184.246606] 3c60: ffffffff dc733cdc c0101a24 dc732000 00000000 dc733ca4 dc733ca8 dc733c98
[ 184.258687] 3c80: c0101a50 c0966298 20000113 ffffffff
[ 184.266229] r4:c0966298 r3:c0101a50
[ 184.271814] [<c0966248>] (preempt_schedule_irq) from [<c0101a50>] (svc_preempt+0x8/0x18)
[ 184.283693] Exception stack(0xdc733ca8 to 0xdc733cf0)
[ 184.291357] 3ca0: dc01c680 dc0024c0 f9e00000 000f4240 dc01c600 00000000
[ 184.303555] 3cc0: ffffffea 00000000 00000000 dc75802c 00000000 dc733d14 dc733d18 dc733cf8
[ 184.315635] 3ce0: c04ae5a8 c04ae3b8 a0000113 ffffffff
[ 184.323401] [<c04ae3a0>] (omap3_dpll_allow_idle) from [<c04ae5a8>] (_omap3_noncore_dpll_bypass+0x7c/0x94)
[ 184.337510] r6:ffffffea r5:00000000 r4:dc01c680 r3:000f4240
[ 184.346108] [<c04ae52c>] (_omap3_noncore_dpll_bypass) from [<c04ae6bc>] (omap3_noncore_dpll_program+0x1c/0x2ac)
[ 184.360959] r6:dc01c680 r5:dc01c680 r4:dc01c600 r3:2aea5400
[ 184.369567] [<c04ae6a0>] (omap3_noncore_dpll_program) from [<c04aec2c>] (omap3_noncore_dpll_set_rate+0x70/0x238)
[ 184.384623] r10:00000000 r9:dc75802c r8:00000000 r7:11e1a300 r6:2aea5400 r5:dc01c680
[ 184.396147] r4:00000000 r3:2aea5400
[ 184.401791] [<c04aebbc>] (omap3_noncore_dpll_set_rate) from [<c04a666c>] (clk_change_rate+0xd0/0x23c)
[ 184.415406] r7:11e1a300 r6:016e3600 r5:dc01d600 r4:dc020240
[ 184.423994] [<c04a659c>] (clk_change_rate) from [<c04a6938>] (clk_core_set_rate_nolock+0x160/0x17c)
[ 184.437434] r10:00000000 r8:dc758080 r7:dc020240 r6:2aea5400 r5:00000000 r4:dc020240
[ 184.449149] [<c04a67d8>] (clk_core_set_rate_nolock) from [<c04a6b7c>] (clk_set_rate+0x38/0x6c)
[ 184.461885] r7:dc758000 r6:c0e074c8 r5:2aea5400 r4:dc63b140
[ 184.470557] [<c04a6b44>] (clk_set_rate) from [<c073968c>] (dev_pm_opp_set_rate+0x29c/0x48c)
[ 184.482849] r5:00000000 r4:dc639400
[ 184.488468] [<c07393f0>] (dev_pm_opp_set_rate) from [<c0742d78>] (set_target+0x34/0x54)
[ 184.500407] r10:00000001 r9:00000000 r8:c0ea8e44 r7:000afc80 r6:00000002 r5:000afc80
[ 184.511890] r4:dc720b00
[ 184.515972] [<c0742d44>] (set_target) from [<c073e104>] (__cpufreq_driver_target+0x270/0x5c4)
[ 184.528578] r6:00000002 r5:00000000 r4:dc720b00 r3:c0742d44
[ 184.537136] [<c073de94>] (__cpufreq_driver_target) from [<c07416a4>] (od_dbs_update+0xe8/0x16c)
[ 184.550074] r10:dc758180 r9:00000000 r8:dc751580 r7:dc720b00 r6:dc751500 r5:dc751580
[ 184.561558] r4:dc751500
[ 184.565637] [<c07415bc>] (od_dbs_update) from [<c07422e8>] (dbs_work_handler+0x34/0x58)
[ 184.577582] r10:00000000 r8:c0e4376c r7:dc720b00 r6:dc751504 r5:00000000 r4:dc751530
[ 184.589351] [<c07422b4>] (dbs_work_handler) from [<c01422e4>] (process_one_work+0x144/0x364)
[ 184.601914] r8:dc751534 r7:dfb3d100 r6:c0e0e47c r5:dc751530 r4:dc71c180 r3:c07422b4
[ 184.613499] [<c01421a0>] (process_one_work) from [<c01426fc>] (worker_thread+0x1b8/0x5a4)
[ 184.625694] r10:00000008 r9:c0e0e47c r8:c0e16020 r7:dc71c194 r6:c0e0e490 r5:c0e0e47c
[ 184.637174] r4:dc71c180
[ 184.641259] [<c0142544>] (worker_thread) from [<c01483e8>] (kthread+0x118/0x150)
[ 184.652325] r10:c0142544 r9:dc06fe88 r8:dc71c180 r7:dc71e058 r6:00000000 r5:dc712cc0
[ 184.663843] r4:dc71e040 r3:00000000
[ 184.669390] [<c01482d0>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 184.680025] Exception stack(0xdc733fb0 to 0xdc733ff8)
[ 184.687629] 3fa0: 00000000 00000000 00000000 00000000
[ 184.699810] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 184.711937] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 184.721864] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c01482d0
[ 184.733392] r4:dc712cc0 r3:ffffffff
[ 184.738901] rcu: rcu_preempt kthread starved for 6001 jiffies! g4713 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
[ 184.753972] rcu: RCU grace-period kthread stack dump:
[ 184.761448] rcu_preempt I 0 10 2 0x00000000
[ 184.769661] Backtrace:
[ 184.773674] [<c0965760>] (__schedule) from [<c096629c>] (preempt_schedule_irq+0x54/0x84)
[ 184.785744] r10:00000000 r9:dc07c000 r8:c0101a24 r7:dc07df24 r6:ffffffff r5:20010113
[ 184.797229] r4:c015c8b8
[ 184.801288] [<c0966248>] (preempt_schedule_irq) from [<c0101a50>] (svc_preempt+0x8/0x18)
[ 184.813167] Exception stack(0xdc07def0 to 0xdc07df38)
[ 184.820777] dee0: c0e14b2c dc07df5c 00000000 00000001
[ 184.832972] df00: c0e14b2c c0e16020 c0e03104 c0e14a5c 00000000 00000005 00000000 dc07df7c
[ 184.845109] df20: 00000000 dc07df40 c017c5b4 c015c8b8 20010113 ffffffff
[ 184.855084] [<c017bf80>] (rcu_gp_kthread) from [<c01483e8>] (kthread+0x118/0x150)
[ 184.866090] r7:dc02ec98
[ 184.870126] [<c01482d0>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 184.880762] Exception stack(0xdc07dfb0 to 0xdc07dff8)
[ 184.888361] dfa0: 00000000 00000000 00000000 00000000
[ 184.900538] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 184.912663] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 184.922596] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c01482d0
[ 184.934117] r4:dc02ec00 r3:ffffffff
=========================Kernel-3.14 logs ====================================
[ 120.343228] usb 1-1.1: new high-speed USB device number 4 using musb-hdrc [ 120.455210] usb 1-1.1: New USB device found, idVendor=19d2, idProduct=1476 [ 120.462414] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 120.470089] usb 1-1.1: Product: Android [ 120.474111] usb 1-1.1: Manufacturer: Android [ 120.478576] usb 1-1.1: SerialNumber: 7a03092b [ 120.487788] option 1-1.1:1.0: GSM modem (1-port) converter detected [ 120.507553] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0 [ 120.518086] option 1-1.1:1.1: GSM modem (1-port) converter detected [ 120.535230] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1 [ 120.544533] option 1-1.1:1.2: GSM modem (1-port) converter detected [ 120.564883] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2 [ 120.577660] cdc_ether 1-1.1:1.3 usb0: register 'cdc_ether' at usb-musb-hdrc.0.auto-1.1, CDC Ethernet Device, fa:e8:a8:ce:42:b4
cat /dev/ttyUSB2 // 1. keep operating the USB Modem
echo "AT+ZRST" > /dev/ttyUSB2 // 2. SW rebooting or power off the USB Modem during reading it
[ 166.578916] option1 ttyUSB2: option_instat_callback: error -71 [ 166.585958] option1 ttyUSB2: option_instat_callback: error -71 [ 166.593284] option1 ttyUSB2: option_instat_callback: error -71 [ 166.625727] option1 ttyUSB2: usb_wwan_indat_callback: resubmit read urb failed. (-19) [ 166.634094] option1 ttyUSB2: usb_wwan_indat_callback: resubmit read urb failed. (-19) [ 166.642313] option1 ttyUSB2: usb_wwan_indat_callback: resubmit read urb failed. (-19) [ 166.650522] option1 ttyUSB2: usb_wwan_indat_callback: resubmit read urb failed. (-19) [ 166.658732] usb 1-1.1: USB disconnect, device number 4 [ 166.664118] option1 ttyUSB2: option_instat_callback: error -71 [ 166.673769] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0 [ 166.683588] option 1-1.1:1.0: device disconnected [ 166.691568] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1 [ 166.701527] option 1-1.1:1.1: device disconnected [ 166.711889] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2 [ 166.721823] option 1-1.1:1.2: device disconnected [ 166.728205] cdc_ether 1-1.1:1.3 usb0: unregister 'cdc_ether' usb-musb-hdrc.0.auto-1.1, CDC Ethernet Device am335x-immu2-a02 login: am335x-immu2-a02 login: am335x-immu2-a02 login: [ 177.923204] usb 1-1.1: new high-speed USB device number 5 using musb-hdrc [ 178.035197] usb 1-1.1: New USB device found, idVendor=19d2, idProduct=1476 [ 178.042376] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 178.050035] usb 1-1.1: Product: Android [ 178.054059] usb 1-1.1: Manufacturer: Android [ 178.058525] usb 1-1.1: SerialNumber: 7a03092b [ 178.067683] option 1-1.1:1.0: GSM modem (1-port) converter detected [ 178.087424] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0 [ 178.097948] option 1-1.1:1.1: GSM modem (1-port) converter detected [ 178.115030] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1 [ 178.124336] option 1-1.1:1.2: GSM modem (1-port) converter detected [ 178.144687] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2 [ 178.157524] cdc_ether 1-1.1:1.3 usb0: register 'cdc_ether' at usb-musb-hdrc.0.auto-1.1, CDC Ethernet Device, c6:f6:57:04:76:f4
