[ 5135.237341] usb 2-2: new full-speed USB device number 22 using xhci_hcd
[ 5135.386917] usb 2-2: New USB device found, idVendor=2341, idProduct=004d, bcdDevice= 2.00
[ 5135.386924] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 5135.386929] usb 2-2: Product: Arduino Zero
[ 5135.386932] usb 2-2: Manufacturer: Arduino LLC
[ 5135.389357] cdc_acm 2-2:1.0: ttyACM0: USB ACM device
[ 5136.760875] ------------[ cut here ]------------
[ 5136.760887] WARNING: CPU: 0 PID: 0 at kernel/workqueue.c:1474 __queue_work+0x346/0x3e0
[ 5136.760889] Modules linked in: cdc_acm rfcomm xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ccm aufs cmac algif_hash overlay algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nls_iso8859_1 intel_rapl_msr mei_hdcp snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep intel_rapl_common snd_pcm x86_pkg_temp_thermal intel_powerclamp coretemp dell_laptop ledtrig_audio btusb btrtl btbcm snd_seq_midi btintel bluetooth uvcvideo dell_smm_hwmon kvm_intel snd_seq_midi_event snd_rawmidi ecdh_generic kvm ecc hid_multitouch crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd i915 snd_seq cryptd glue_helper iwlmvm snd_seq_device rapl mac80211 intel_cstate snd_timer libarc4 dell_wmi drm_kms_helper iwlwifi cec dell_smbios input_leds
[ 5136.760950]  dcdbas joydev serio_raw rc_core dell_wmi_descriptor sparse_keymap snd wmi_bmof i2c_algo_bit fb_sys_fops cfg80211 syscopyarea mei_me sysfillrect sysimgblt mei soundcore acpi_als kfifo_buf industrialio mac_hid dell_rbtn intel_smartconnect sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_logitech_hidpp hid_logitech_dj usbhid btrfs blake2b_generic xor raid6_pq libcrc32c hid_rmi rmi_core videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc hid_generic crc32_pclmul psmouse ahci i2c_i801 xhci_pci libahci i2c_smbus xhci_pci_renesas wmi lpc_ich video i2c_hid hid
[ 5136.760996] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           OE     5.8.0-41-generic #46~20.04.1-Ubuntu
[ 5136.760998] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A08 08/31/2015
[ 5136.761002] RIP: 0010:__queue_work+0x346/0x3e0
[ 5136.761007] Code: 47 95 52 a9 00 01 ff 00 75 0f 65 48 8b 3c 25 c0 7b 01 00 f6 47 24 20 75 25 0f 0b 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e9 fd fd ff ff 41 83 cd 02 48 8d 53 60 e9 e2 fd ff ff e8 e1
[ 5136.761009] RSP: 0018:ffffaf8640003e28 EFLAGS: 00010093
[ 5136.761012] RAX: ffff94f1153b1798 RBX: ffff94f117831700 RCX: 0000000000000000
[ 5136.761014] RDX: ffff94f1153b1790 RSI: 0000000000000000 RDI: ffff94f11782c040
[ 5136.761016] RBP: ffffaf8640003e68 R08: ffff94f11782c040 R09: ffff94f116400920
[ 5136.761018] R10: 0000000000000000 R11: ffffffffaec628d8 R12: 0000000000000025
[ 5136.761020] R13: ffff94f116818e00 R14: 0000000000002000 R15: ffff94f1153b1790
[ 5136.761023] FS:  0000000000000000(0000) GS:ffff94f117800000(0000) knlGS:0000000000000000
[ 5136.761025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5136.761027] CR2: 00007fa36465fee0 CR3: 000000011680a006 CR4: 00000000001606f0
[ 5136.761029] Call Trace:
[ 5136.761032]  <IRQ>
[ 5136.761039]  queue_work_on+0x3b/0x50
[ 5136.761048]  acm_write_bulk+0x70/0x80 [cdc_acm]
[ 5136.761056]  __usb_hcd_giveback_urb+0x7a/0x120
[ 5136.761061]  usb_giveback_urb_bh+0xa1/0x100
[ 5136.761070]  tasklet_action_common.isra.0+0x60/0x110
[ 5136.761075]  tasklet_action+0x22/0x30
[ 5136.761081]  __do_softirq+0xe1/0x2d6
[ 5136.761086]  asm_call_irq_on_stack+0x12/0x20
[ 5136.761088]  </IRQ>
[ 5136.761093]  do_softirq_own_stack+0x3d/0x50
[ 5136.761098]  irq_exit_rcu+0xa4/0xb0
[ 5136.761105]  common_interrupt+0x7c/0x150
[ 5136.761109]  asm_common_interrupt+0x1e/0x40
[ 5136.761116] RIP: 0010:cpuidle_enter_state+0xca/0x3e0
[ 5136.761119] Code: ff e8 9a 7c 78 ff 80 7d c7 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 e4 02 00 00 31 ff e8 4d 3a 7f ff fb 66 0f 1f 44 00 00 <45> 85 e4 0f 88 39 02 00 00 49 63 d4 4c 8b 7d d0 4c 2b 7d c8 48 8d
[ 5136.761121] RSP: 0018:ffffffffaec03dc0 EFLAGS: 00000246
[ 5136.761123] RAX: ffff94f11782c6c0 RBX: ffff94f117837500 RCX: 000000000000001f
[ 5136.761125] RDX: 0000000000000000 RSI: 000000003574f673 RDI: 0000000000000000
[ 5136.761127] RBP: ffffffffaec03e00 R08: 000004abfecddf0d R09: 0000000000000001
[ 5136.761128] R10: ffff94f11782b384 R11: ffff94f11782b364 R12: 0000000000000004
[ 5136.761130] R13: ffffffffaed71ac0 R14: 0000000000000004 R15: ffff94f117837500
[ 5136.761138]  cpuidle_enter+0x2e/0x40
[ 5136.761146]  call_cpuidle+0x23/0x40
[ 5136.761152]  do_idle+0x1e7/0x280
[ 5136.761158]  cpu_startup_entry+0x20/0x30
[ 5136.761161]  rest_init+0xae/0xb0
[ 5136.761171]  arch_call_rest_init+0xe/0x1b
[ 5136.761174]  start_kernel+0x6bc/0x6e2
[ 5136.761180]  x86_64_start_reservations+0x24/0x26
[ 5136.761185]  x86_64_start_kernel+0x8b/0x8f
[ 5136.761192]  secondary_startup_64+0xb6/0xc0
[ 5136.761196] ---[ end trace 6f2716bfb3dbcf01 ]---
[ 5172.549708] usb 2-2: USB disconnect, device number 22
[ 5199.665591] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:0:9069]
[ 5199.665604] Modules linked in: cdc_acm rfcomm xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ccm aufs cmac algif_hash overlay algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nls_iso8859_1 intel_rapl_msr mei_hdcp snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep intel_rapl_common snd_pcm x86_pkg_temp_thermal intel_powerclamp coretemp dell_laptop ledtrig_audio btusb btrtl btbcm snd_seq_midi btintel bluetooth uvcvideo dell_smm_hwmon kvm_intel snd_seq_midi_event snd_rawmidi ecdh_generic kvm ecc hid_multitouch crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd i915 snd_seq cryptd glue_helper iwlmvm snd_seq_device rapl mac80211 intel_cstate snd_timer libarc4 dell_wmi drm_kms_helper iwlwifi cec dell_smbios input_leds
[ 5199.665645]  dcdbas joydev serio_raw rc_core dell_wmi_descriptor sparse_keymap snd wmi_bmof i2c_algo_bit fb_sys_fops cfg80211 syscopyarea mei_me sysfillrect sysimgblt mei soundcore acpi_als kfifo_buf industrialio mac_hid dell_rbtn intel_smartconnect sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_logitech_hidpp hid_logitech_dj usbhid btrfs blake2b_generic xor raid6_pq libcrc32c hid_rmi rmi_core videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc hid_generic crc32_pclmul psmouse ahci i2c_i801 xhci_pci libahci i2c_smbus xhci_pci_renesas wmi lpc_ich video i2c_hid hid
[ 5199.665663] CPU: 0 PID: 9069 Comm: kworker/0:0 Tainted: G        W  OE     5.8.0-41-generic #46~20.04.1-Ubuntu
[ 5199.665664] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A08 08/31/2015
[ 5199.665668] Workqueue: usb_hub_wq hub_event
[ 5199.665671] RIP: 0010:try_to_grab_pending+0xb/0x150
[ 5199.665672] Code: 8b 44 24 08 48 8b 78 50 48 83 c7 18 e8 1e 81 03 00 eb b2 66 66 2e 0f 1f 84 00 00 00 00 00 90 0f 1f 44 00 00 55 48 89 e5 41 55 <41> 54 49 89 d4 53 48 89 fb 48 83 ec 08 9c 58 0f 1f 44 00 00 48 89
[ 5199.665673] RSP: 0018:ffffaf864c463a70 EFLAGS: 00000286
[ 5199.665674] RAX: 00000000fffffff5 RBX: 00000000fffffff5 RCX: 0000000000000000
[ 5199.665674] RDX: ffffaf864c463a88 RSI: 0000000000000000 RDI: ffff94f1153b1790
[ 5199.665675] RBP: ffffaf864c463a78 R08: ffff94f11782c040 R09: ffff94f116400920
[ 5199.665675] R10: 0000000000000000 R11: ffffffffaec628d8 R12: ffff94f1153b1790
[ 5199.665676] R13: 0000000000000000 R14: ffff94f0fae2af00 R15: ffff94f1153b1440
[ 5199.665677] FS:  0000000000000000(0000) GS:ffff94f117800000(0000) knlGS:0000000000000000
[ 5199.665677] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5199.665678] CR2: 000015d7e4fe1288 CR3: 000000011680a005 CR4: 00000000001606f0
[ 5199.665679] Call Trace:
[ 5199.665682]  __cancel_work_timer+0x42/0x190
[ 5199.665684]  ? usb_kill_urb+0x4e/0xc0
[ 5199.665687]  ? __tty_hangup.part.0+0x21f/0x290
[ 5199.665688]  cancel_work_sync+0x10/0x20
[ 5199.665691]  acm_disconnect+0x110/0x200 [cdc_acm]
[ 5199.665693]  usb_unbind_interface+0x8c/0x260
[ 5199.665695]  device_release_driver_internal+0xf0/0x1d0
[ 5199.665696]  device_release_driver+0x12/0x20
[ 5199.665699]  bus_remove_device+0xe1/0x150
[ 5199.665701]  device_del+0x17b/0x3e0
[ 5199.665703]  ? usb_remove_ep_devs+0x1f/0x30
[ 5199.665705]  usb_disable_device+0x95/0x1c0
[ 5199.665706]  usb_disconnect+0xc0/0x270
[ 5199.665707]  hub_port_connect+0x7d/0x850
[ 5199.665709]  port_event+0x57f/0x860
[ 5199.665711]  ? sched_clock_cpu+0x11/0xb0
[ 5199.665713]  hub_event+0x152/0x3b0
[ 5199.665714]  process_one_work+0x1e8/0x3b0
[ 5199.665716]  worker_thread+0x4d/0x3f0
[ 5199.665718]  kthread+0x114/0x150
[ 5199.665719]  ? process_one_work+0x3b0/0x3b0
[ 5199.665720]  ? kthread_park+0x90/0x90
[ 5199.665723]  ret_from_fork+0x22/0x30
[ 5227.665713] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:0:9069]
[ 5227.665721] Modules linked in: cdc_acm rfcomm xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ccm aufs cmac algif_hash overlay algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nls_iso8859_1 intel_rapl_msr mei_hdcp snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep intel_rapl_common snd_pcm x86_pkg_temp_thermal intel_powerclamp coretemp dell_laptop ledtrig_audio btusb btrtl btbcm snd_seq_midi btintel bluetooth uvcvideo dell_smm_hwmon kvm_intel snd_seq_midi_event snd_rawmidi ecdh_generic kvm ecc hid_multitouch crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd i915 snd_seq cryptd glue_helper iwlmvm snd_seq_device rapl mac80211 intel_cstate snd_timer libarc4 dell_wmi drm_kms_helper iwlwifi cec dell_smbios input_leds
[ 5227.665790]  dcdbas joydev serio_raw rc_core dell_wmi_descriptor sparse_keymap snd wmi_bmof i2c_algo_bit fb_sys_fops cfg80211 syscopyarea mei_me sysfillrect sysimgblt mei soundcore acpi_als kfifo_buf industrialio mac_hid dell_rbtn intel_smartconnect sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_logitech_hidpp hid_logitech_dj usbhid btrfs blake2b_generic xor raid6_pq libcrc32c hid_rmi rmi_core videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc hid_generic crc32_pclmul psmouse ahci i2c_i801 xhci_pci libahci i2c_smbus xhci_pci_renesas wmi lpc_ich video i2c_hid hid
[ 5227.665837] CPU: 0 PID: 9069 Comm: kworker/0:0 Tainted: G        W  OEL    5.8.0-41-generic #46~20.04.1-Ubuntu
[ 5227.665839] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A08 08/31/2015
[ 5227.665847] Workqueue: usb_hub_wq hub_event
[ 5227.665856] RIP: 0010:try_to_grab_pending+0x0/0x150
[ 5227.665860] Code: 8b 44 24 08 f0 ff 48 48 75 c6 49 8b 44 24 08 48 8b 78 50 48 83 c7 18 e8 1e 81 03 00 eb b2 66 66 2e 0f 1f 84 00 00 00 00 00 90 <0f> 1f 44 00 00 55 48 89 e5 41 55 41 54 49 89 d4 53 48 89 fb 48 83
[ 5227.665862] RSP: 0018:ffffaf864c463a80 EFLAGS: 00000286
[ 5227.665865] RAX: 00000000fffffff5 RBX: 00000000fffffff5 RCX: 0000000000000000
[ 5227.665867] RDX: ffffaf864c463a88 RSI: 0000000000000000 RDI: ffff94f1153b1790
[ 5227.665869] RBP: ffffaf864c463ae8 R08: ffff94f11782c040 R09: ffff94f116400920
[ 5227.665870] R10: 0000000000000000 R11: ffffffffaec628d8 R12: ffff94f1153b1790
[ 5227.665872] R13: 0000000000000000 R14: ffff94f0fae2af00 R15: ffff94f1153b1440
[ 5227.665875] FS:  0000000000000000(0000) GS:ffff94f117800000(0000) knlGS:0000000000000000
[ 5227.665877] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5227.665879] CR2: 000015d7e4fe1288 CR3: 000000011680a005 CR4: 00000000001606f0
[ 5227.665881] Call Trace:
[ 5227.665887]  ? __cancel_work_timer+0x42/0x190
[ 5227.665895]  ? usb_kill_urb+0x4e/0xc0
[ 5227.665902]  ? __tty_hangup.part.0+0x21f/0x290
[ 5227.665906]  cancel_work_sync+0x10/0x20
[ 5227.665915]  acm_disconnect+0x110/0x200 [cdc_acm]
[ 5227.665920]  usb_unbind_interface+0x8c/0x260
[ 5227.665926]  device_release_driver_internal+0xf0/0x1d0
[ 5227.665930]  device_release_driver+0x12/0x20
[ 5227.665936]  bus_remove_device+0xe1/0x150
[ 5227.665941]  device_del+0x17b/0x3e0
[ 5227.665947]  ? usb_remove_ep_devs+0x1f/0x30
[ 5227.665952]  usb_disable_device+0x95/0x1c0
[ 5227.665956]  usb_disconnect+0xc0/0x270
[ 5227.665960]  hub_port_connect+0x7d/0x850
[ 5227.665965]  port_event+0x57f/0x860
[ 5227.665972]  ? sched_clock_cpu+0x11/0xb0
[ 5227.665977]  hub_event+0x152/0x3b0
[ 5227.665981]  process_one_work+0x1e8/0x3b0
[ 5227.665985]  worker_thread+0x4d/0x3f0
[ 5227.665992]  kthread+0x114/0x150
[ 5227.665995]  ? process_one_work+0x3b0/0x3b0
[ 5227.665999]  ? kthread_park+0x90/0x90
[ 5227.666006]  ret_from_fork+0x22/0x30
[ 5232.561720] rcu: INFO: rcu_sched self-detected stall on CPU
[ 5232.561738] rcu: 	0-....: (15000 ticks this GP) idle=6c2/1/0x4000000000000000 softirq=837858/837858 fqs=7148 
[ 5232.561740] 	(t=15000 jiffies g=1651405 q=6589)
[ 5232.561742] NMI backtrace for cpu 0
[ 5232.561745] CPU: 0 PID: 9069 Comm: kworker/0:0 Tainted: G        W  OEL    5.8.0-41-generic #46~20.04.1-Ubuntu
[ 5232.561746] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A08 08/31/2015
[ 5232.561751] Workqueue: usb_hub_wq hub_event
[ 5232.561752] Call Trace:
[ 5232.561754]  <IRQ>
[ 5232.561772]  dump_stack+0x74/0x9a
[ 5232.561780]  ? lapic_can_unplug_cpu.cold+0x40/0x40
[ 5232.561787]  nmi_cpu_backtrace.cold+0x14/0x53
[ 5232.561791]  nmi_trigger_cpumask_backtrace+0xe8/0xea
[ 5232.561796]  arch_trigger_cpumask_backtrace+0x19/0x20
[ 5232.561802]  rcu_dump_cpu_stacks+0xab/0xdd
[ 5232.561806]  rcu_sched_clock_irq.cold+0x23a/0x417
[ 5232.561813]  ? account_system_index_time+0x91/0xa0
[ 5232.561820]  update_process_times+0x28/0x60
[ 5232.561826]  tick_sched_handle.isra.0+0x25/0x60
[ 5232.561830]  tick_sched_timer+0x40/0x80
[ 5232.561835]  __hrtimer_run_queues+0xf7/0x270
[ 5232.561839]  ? tick_sched_do_timer+0x60/0x60
[ 5232.561842]  hrtimer_interrupt+0x109/0x220
[ 5232.561846]  __sysvec_apic_timer_interrupt+0x64/0x100
[ 5232.561851]  asm_call_irq_on_stack+0x12/0x20
[ 5232.561853]  </IRQ>
[ 5232.561860]  sysvec_apic_timer_interrupt+0x7e/0x90
[ 5232.561863]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 5232.561869] RIP: 0010:try_to_grab_pending+0x83/0x150
[ 5232.561872] Code: c7 e8 61 90 ab 00 48 8b 03 a8 04 74 0d 48 25 00 ff ff ff 74 05 4c 3b 28 74 5d 4c 89 ef c6 07 00 0f 1f 40 00 49 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 13 b8 fe ff ff ff 83 e2 14 48 83 fa 10 74 a3
[ 5232.561874] RSP: 0018:ffffaf864c463a58 EFLAGS: 00000292
[ 5232.561877] RAX: 0000000000000001 RBX: ffff94f1153b1790 RCX: 0000000000000000
[ 5232.561879] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000292
[ 5232.561880] RBP: ffffaf864c463a78 R08: ffff94f11782c040 R09: ffff94f116400920
[ 5232.561882] R10: 0000000000000000 R11: ffffffffaec628d8 R12: ffffaf864c463a88
[ 5232.561884] R13: ffff94f11782c040 R14: ffff94f0fae2af00 R15: ffff94f1153b1440
[ 5232.561890]  ? __cancel_work_timer+0x44/0x190
[ 5232.561893]  __cancel_work_timer+0x42/0x190
[ 5232.561898]  ? usb_kill_urb+0x4e/0xc0
[ 5232.561903]  ? __tty_hangup.part.0+0x21f/0x290
[ 5232.561907]  cancel_work_sync+0x10/0x20
[ 5232.561916]  acm_disconnect+0x110/0x200 [cdc_acm]
[ 5232.561920]  usb_unbind_interface+0x8c/0x260
[ 5232.561926]  device_release_driver_internal+0xf0/0x1d0
[ 5232.561929]  device_release_driver+0x12/0x20
[ 5232.561934]  bus_remove_device+0xe1/0x150
[ 5232.561939]  device_del+0x17b/0x3e0
[ 5232.561944]  ? usb_remove_ep_devs+0x1f/0x30
[ 5232.561949]  usb_disable_device+0x95/0x1c0
[ 5232.561952]  usb_disconnect+0xc0/0x270
[ 5232.561957]  hub_port_connect+0x7d/0x850
[ 5232.561961]  port_event+0x57f/0x860
[ 5232.561967]  ? sched_clock_cpu+0x11/0xb0
[ 5232.561972]  hub_event+0x152/0x3b0
[ 5232.561976]  process_one_work+0x1e8/0x3b0
[ 5232.561979]  worker_thread+0x4d/0x3f0
[ 5232.561985]  kthread+0x114/0x150
[ 5232.561988]  ? process_one_work+0x3b0/0x3b0
[ 5232.561992]  ? kthread_park+0x90/0x90
[ 5232.561998]  ret_from_fork+0x22/0x30
[ 5259.665804] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:0:9069]
[ 5259.665812] Modules linked in: cdc_acm rfcomm xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ccm aufs cmac algif_hash overlay algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nls_iso8859_1 intel_rapl_msr mei_hdcp snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep intel_rapl_common snd_pcm x86_pkg_temp_thermal intel_powerclamp coretemp dell_laptop ledtrig_audio btusb btrtl btbcm snd_seq_midi btintel bluetooth uvcvideo dell_smm_hwmon kvm_intel snd_seq_midi_event snd_rawmidi ecdh_generic kvm ecc hid_multitouch crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd i915 snd_seq cryptd glue_helper iwlmvm snd_seq_device rapl mac80211 intel_cstate snd_timer libarc4 dell_wmi drm_kms_helper iwlwifi cec dell_smbios input_leds
[ 5259.665887]  dcdbas joydev serio_raw rc_core dell_wmi_descriptor sparse_keymap snd wmi_bmof i2c_algo_bit fb_sys_fops cfg80211 syscopyarea mei_me sysfillrect sysimgblt mei soundcore acpi_als kfifo_buf industrialio mac_hid dell_rbtn intel_smartconnect sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_logitech_hidpp hid_logitech_dj usbhid btrfs blake2b_generic xor raid6_pq libcrc32c hid_rmi rmi_core videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc hid_generic crc32_pclmul psmouse ahci i2c_i801 xhci_pci libahci i2c_smbus xhci_pci_renesas wmi lpc_ich video i2c_hid hid
[ 5259.665934] CPU: 0 PID: 9069 Comm: kworker/0:0 Tainted: G        W  OEL    5.8.0-41-generic #46~20.04.1-Ubuntu
[ 5259.665936] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A08 08/31/2015
[ 5259.665945] Workqueue: usb_hub_wq hub_event
[ 5259.665953] RIP: 0010:try_to_grab_pending+0x83/0x150
[ 5259.665958] Code: c7 e8 61 90 ab 00 48 8b 03 a8 04 74 0d 48 25 00 ff ff ff 74 05 4c 3b 28 74 5d 4c 89 ef c6 07 00 0f 1f 40 00 49 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 13 b8 fe ff ff ff 83 e2 14 48 83 fa 10 74 a3
[ 5259.665960] RSP: 0018:ffffaf864c463a58 EFLAGS: 00000292
[ 5259.665963] RAX: 0000000000000001 RBX: ffff94f1153b1790 RCX: 0000000000000000
[ 5259.665965] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000292
[ 5259.665967] RBP: ffffaf864c463a78 R08: ffff94f11782c040 R09: ffff94f116400920
[ 5259.665968] R10: 0000000000000000 R11: ffffffffaec628d8 R12: ffffaf864c463a88
[ 5259.665970] R13: ffff94f11782c040 R14: ffff94f0fae2af00 R15: ffff94f1153b1440
[ 5259.665973] FS:  0000000000000000(0000) GS:ffff94f117800000(0000) knlGS:0000000000000000
[ 5259.665975] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5259.665977] CR2: 000015d7e4fe1288 CR3: 000000011680a005 CR4: 00000000001606f0
[ 5259.665979] Call Trace:
[ 5259.665989]  __cancel_work_timer+0x42/0x190
[ 5259.665995]  ? usb_kill_urb+0x4e/0xc0
[ 5259.666002]  ? __tty_hangup.part.0+0x21f/0x290
[ 5259.666006]  cancel_work_sync+0x10/0x20
[ 5259.666015]  acm_disconnect+0x110/0x200 [cdc_acm]
[ 5259.666021]  usb_unbind_interface+0x8c/0x260
[ 5259.666027]  device_release_driver_internal+0xf0/0x1d0
[ 5259.666030]  device_release_driver+0x12/0x20
[ 5259.666037]  bus_remove_device+0xe1/0x150
[ 5259.666041]  device_del+0x17b/0x3e0
[ 5259.666047]  ? usb_remove_ep_devs+0x1f/0x30
[ 5259.666053]  usb_disable_device+0x95/0x1c0
[ 5259.666056]  usb_disconnect+0xc0/0x270
[ 5259.666061]  hub_port_connect+0x7d/0x850
[ 5259.666066]  port_event+0x57f/0x860
[ 5259.666073]  ? sched_clock_cpu+0x11/0xb0
[ 5259.666078]  hub_event+0x152/0x3b0
[ 5259.666082]  process_one_work+0x1e8/0x3b0
[ 5259.666086]  worker_thread+0x4d/0x3f0
[ 5259.666093]  kthread+0x114/0x150
[ 5259.666096]  ? process_one_work+0x3b0/0x3b0
[ 5259.666100]  ? kthread_park+0x90/0x90
[ 5259.666107]  ret_from_fork+0x22/0x30