Public bug reported: $ lsb_release -rd Description: Ubuntu 19.10 Release: 19.10
Package: linux-image-5.3.0-51-generic What happened: After plugging my TP-Link (Realtek 8152 based) USB GbE ethernet device into my laptop and using it, network connectivity loss occurs several minutes later. Once this has occurred, various processes on the system hang when I run them (eg "ip a"; "sudo"). It appears that the rtnetlink lock is held and is never released. The device disappears from the list of available devices. What I expected: I can plug the ethernet device in and use it to successfully observe cats on the internet for hours at a time. Kernel logs: May 11 22:15:58 allosaurus kernel: usb 2-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd May 11 22:15:58 allosaurus kernel: usb 2-2: New USB device found, idVendor=2357, idProduct=0601, bcdDevice=30.00 May 11 22:15:58 allosaurus kernel: usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=6 May 11 22:15:58 allosaurus kernel: usb 2-2: Product: USB 10/100/1000 LAN May 11 22:15:58 allosaurus kernel: usb 2-2: Manufacturer: TP-LINK May 11 22:15:58 allosaurus kernel: usb 2-2: SerialNumber: 000001000000 May 11 22:15:59 allosaurus kernel: usbcore: registered new interface driver r8152 May 11 22:15:59 allosaurus kernel: usbcore: registered new interface driver cdc_ether May 11 22:15:59 allosaurus kernel: usb 2-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd May 11 22:15:59 allosaurus kernel: r8152 2-2:1.0 eth0: v1.09.11 May 11 22:15:59 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: renamed from eth0 May 11 22:16:02 allosaurus kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enxd03745081b4b: link becomes ready May 11 22:16:02 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier on May 11 22:16:02 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier off May 11 22:16:05 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier on May 11 22:20:17 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:24:33 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:24:39 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:25:14 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:30:31 allosaurus kernel: INFO: task kworker/1:2:10776 blocked for more than 120 seconds. May 11 22:30:31 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:30:31 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:30:31 allosaurus kernel: kworker/1:2 D 0 10776 2 0x80004000 May 11 22:30:31 allosaurus kernel: Workqueue: events rtl_work_func_t [r8152] May 11 22:30:31 allosaurus kernel: Call Trace: May 11 22:30:31 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:30:31 allosaurus kernel: schedule+0x42/0xb0 May 11 22:30:31 allosaurus kernel: rpm_resume+0x174/0x780 May 11 22:30:31 allosaurus kernel: ? wait_woken+0x80/0x80 May 11 22:30:31 allosaurus kernel: rpm_resume+0x31d/0x780 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_xtra+0x1c5/0x5c0 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x40/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: __pm_runtime_resume+0x52/0x80 May 11 22:30:31 allosaurus kernel: usb_autopm_get_interface+0x1d/0x50 May 11 22:30:31 allosaurus kernel: rtl_work_func_t+0x70/0x285 [r8152] May 11 22:30:31 allosaurus kernel: ? __schedule+0x2c1/0x6c0 May 11 22:30:31 allosaurus kernel: process_one_work+0x1db/0x380 May 11 22:30:31 allosaurus kernel: worker_thread+0x4d/0x400 May 11 22:30:31 allosaurus kernel: kthread+0x104/0x140 May 11 22:30:31 allosaurus kernel: ? process_one_work+0x380/0x380 May 11 22:30:31 allosaurus kernel: ? kthread_park+0x80/0x80 May 11 22:30:31 allosaurus kernel: ret_from_fork+0x35/0x40 May 11 22:31:34 allosaurus kernel: usb 2-2: USB disconnect, device number 2 May 11 22:32:32 allosaurus kernel: INFO: task NetworkManager:1470 blocked for more than 120 seconds. May 11 22:32:32 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:32:32 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:32:32 allosaurus kernel: NetworkManager D 0 1470 1 0x00000000 May 11 22:32:32 allosaurus kernel: Call Trace: May 11 22:32:32 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:32:32 allosaurus kernel: schedule+0x42/0xb0 May 11 22:32:32 allosaurus kernel: schedule_preempt_disabled+0xe/0x10 May 11 22:32:32 allosaurus kernel: __mutex_lock.isra.0+0x182/0x4f0 May 11 22:32:32 allosaurus kernel: __mutex_lock_slowpath+0x13/0x20 May 11 22:32:32 allosaurus kernel: mutex_lock+0x2e/0x40 May 11 22:32:32 allosaurus kernel: rtnl_lock+0x15/0x20 May 11 22:32:32 allosaurus kernel: nl80211_dump_scan+0x34/0x6d0 [cfg80211] May 11 22:32:32 allosaurus kernel: ? __kmalloc_reserve.isra.0+0x31/0x90 May 11 22:32:32 allosaurus kernel: genl_lock_dumpit+0x33/0x50 May 11 22:32:32 allosaurus kernel: netlink_dump+0x18b/0x380 May 11 22:32:32 allosaurus kernel: __netlink_dump_start+0x191/0x200 May 11 22:32:32 allosaurus kernel: genl_family_rcv_msg+0x2f3/0x470 May 11 22:32:32 allosaurus kernel: ? genl_lock_dumpit+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? genl_lock_done+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? genl_unlock+0x20/0x20 May 11 22:32:32 allosaurus kernel: ? __alloc_skb+0x84/0x1d0 May 11 22:32:32 allosaurus kernel: ? do_sys_poll+0x415/0x530 May 11 22:32:32 allosaurus kernel: genl_rcv_msg+0x4c/0xa0 May 11 22:32:32 allosaurus kernel: ? genl_family_rcv_msg+0x470/0x470 May 11 22:32:32 allosaurus kernel: netlink_rcv_skb+0x50/0x120 May 11 22:32:32 allosaurus kernel: genl_rcv+0x29/0x40 May 11 22:32:32 allosaurus kernel: netlink_unicast+0x187/0x220 May 11 22:32:32 allosaurus kernel: netlink_sendmsg+0x222/0x3e0 May 11 22:32:32 allosaurus kernel: sock_sendmsg+0x65/0x70 May 11 22:32:32 allosaurus kernel: ____sys_sendmsg+0x212/0x280 May 11 22:32:32 allosaurus kernel: ___sys_sendmsg+0x88/0xd0 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? ep_poll+0x294/0x420 May 11 22:32:32 allosaurus kernel: ? __fget_light+0x57/0x70 May 11 22:32:32 allosaurus kernel: __sys_sendmsg+0x5c/0xa0 May 11 22:32:32 allosaurus kernel: __x64_sys_sendmsg+0x1f/0x30 May 11 22:32:32 allosaurus kernel: do_syscall_64+0x5a/0x130 May 11 22:32:32 allosaurus kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 May 11 22:32:32 allosaurus kernel: RIP: 0033:0x7fae0d9e52ad May 11 22:32:32 allosaurus kernel: Code: Bad RIP value. May 11 22:32:32 allosaurus kernel: RSP: 002b:00007fff53453b70 EFLAGS: 00000293 ORIG_RAX: 000000000000002e May 11 22:32:32 allosaurus kernel: RAX: ffffffffffffffda RBX: 0000561c49219380 RCX: 00007fae0d9e52ad May 11 22:32:32 allosaurus kernel: RDX: 0000000000000000 RSI: 00007fff53453bc0 RDI: 000000000000000b May 11 22:32:32 allosaurus kernel: RBP: 00007fff53453bc0 R08: 0000000000000000 R09: 0000000000001000 May 11 22:32:32 allosaurus kernel: R10: 0000561c491ec010 R11: 0000000000000293 R12: 0000561c49219380 May 11 22:32:32 allosaurus kernel: R13: 0000561c49219540 R14: 00007fae0db1f280 R15: 0000561c49421370 May 11 22:32:32 allosaurus kernel: INFO: task Qt bearer threa:2482 blocked for more than 120 seconds. May 11 22:32:32 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:32:32 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:32:32 allosaurus kernel: Qt bearer threa D 0 2482 1 0x00000000 May 11 22:32:32 allosaurus kernel: Call Trace: May 11 22:32:32 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:32:32 allosaurus kernel: schedule+0x42/0xb0 May 11 22:32:32 allosaurus kernel: schedule_preempt_disabled+0xe/0x10 May 11 22:32:32 allosaurus kernel: __mutex_lock.isra.0+0x182/0x4f0 May 11 22:32:32 allosaurus kernel: __mutex_lock_slowpath+0x13/0x20 May 11 22:32:32 allosaurus kernel: mutex_lock+0x2e/0x40 May 11 22:32:32 allosaurus kernel: __netlink_dump_start+0x59/0x200 May 11 22:32:32 allosaurus kernel: rtnetlink_rcv_msg+0x23a/0x380 May 11 22:32:32 allosaurus kernel: ? rtnl_fill_ifinfo+0xe80/0xe80 May 11 22:32:32 allosaurus kernel: ? rtnl_fill_ifinfo+0xe80/0xe80 May 11 22:32:32 allosaurus kernel: ? rtnl_calcit.isra.0+0x100/0x100 May 11 22:32:32 allosaurus kernel: netlink_rcv_skb+0x50/0x120 May 11 22:32:32 allosaurus kernel: rtnetlink_rcv+0x15/0x20 May 11 22:32:32 allosaurus kernel: netlink_unicast+0x187/0x220 May 11 22:32:32 allosaurus kernel: netlink_sendmsg+0x222/0x3e0 May 11 22:32:32 allosaurus kernel: sock_sendmsg+0x65/0x70 May 11 22:32:32 allosaurus kernel: __sys_sendto+0x113/0x190 May 11 22:32:32 allosaurus kernel: ? fd_install+0x27/0x30 May 11 22:32:32 allosaurus kernel: ? __sys_socket+0x9e/0xf0 May 11 22:32:32 allosaurus kernel: __x64_sys_sendto+0x29/0x30 May 11 22:32:32 allosaurus kernel: do_syscall_64+0x5a/0x130 May 11 22:32:32 allosaurus kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 May 11 22:32:32 allosaurus kernel: RIP: 0033:0x7f07df539dfa May 11 22:32:32 allosaurus kernel: Code: Bad RIP value. After observing this issue, I attempted to upgrade to mainline image "linux-image-unsigned-5.6.11-050611-generic" from https://kernel.ubuntu.com/~kernel-ppa/mainline/ and this fixed the issue (although the device continually reconnects). See the corresponding kernel logs below for comparison against the above: May 12 19:12:00 allosaurus kernel: usb 4-1.2: new SuperSpeed Gen 1 USB device number 16 using xhci_hcd May 12 19:12:00 allosaurus kernel: usb 4-1.2: New USB device found, idVendor=2357, idProduct=0601, bcdDevice=30.00 May 12 19:12:00 allosaurus kernel: usb 4-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=6 May 12 19:12:00 allosaurus kernel: usb 4-1.2: Product: USB 10/100/1000 LAN May 12 19:12:00 allosaurus kernel: usb 4-1.2: Manufacturer: TP-LINK May 12 19:12:00 allosaurus kernel: usb 4-1.2: SerialNumber: 000001000000 May 12 19:12:00 allosaurus kernel: usb 4-1.2: reset SuperSpeed Gen 1 USB device number 16 using xhci_hcd May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0: Direct firmware load for rtl_nic/rtl8153a-3.fw failed with error -2 May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0: unable to load firmware patch rtl_nic/rtl8153a-3.fw (-2) May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0 eth0: v1.11.11 May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: renamed from eth0 May 12 19:12:03 allosaurus kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enxd03745081b4b: link becomes ready May 12 19:12:03 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier on May 12 19:12:03 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier off May 12 19:12:06 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier on May 12 19:12:42 allosaurus kernel: usb 4-1.2: USB disconnect, device number 16 (I note that these mainline logs recur at least once per minute, but I suspect that when I am able to fetch an up-to-date firmware package the latest packege will address this; not yet confirmed). ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1878321 Title: Kernel workqueue rtl_work_func_t [r8152] gets stuck, preventing network connectivity: Bad RIP value Status in linux package in Ubuntu: New Bug description: $ lsb_release -rd Description: Ubuntu 19.10 Release: 19.10 Package: linux-image-5.3.0-51-generic What happened: After plugging my TP-Link (Realtek 8152 based) USB GbE ethernet device into my laptop and using it, network connectivity loss occurs several minutes later. Once this has occurred, various processes on the system hang when I run them (eg "ip a"; "sudo"). It appears that the rtnetlink lock is held and is never released. The device disappears from the list of available devices. What I expected: I can plug the ethernet device in and use it to successfully observe cats on the internet for hours at a time. Kernel logs: May 11 22:15:58 allosaurus kernel: usb 2-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd May 11 22:15:58 allosaurus kernel: usb 2-2: New USB device found, idVendor=2357, idProduct=0601, bcdDevice=30.00 May 11 22:15:58 allosaurus kernel: usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=6 May 11 22:15:58 allosaurus kernel: usb 2-2: Product: USB 10/100/1000 LAN May 11 22:15:58 allosaurus kernel: usb 2-2: Manufacturer: TP-LINK May 11 22:15:58 allosaurus kernel: usb 2-2: SerialNumber: 000001000000 May 11 22:15:59 allosaurus kernel: usbcore: registered new interface driver r8152 May 11 22:15:59 allosaurus kernel: usbcore: registered new interface driver cdc_ether May 11 22:15:59 allosaurus kernel: usb 2-2: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd May 11 22:15:59 allosaurus kernel: r8152 2-2:1.0 eth0: v1.09.11 May 11 22:15:59 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: renamed from eth0 May 11 22:16:02 allosaurus kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enxd03745081b4b: link becomes ready May 11 22:16:02 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier on May 11 22:16:02 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier off May 11 22:16:05 allosaurus kernel: r8152 2-2:1.0 enxd03745081b4b: carrier on May 11 22:20:17 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:24:33 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:24:39 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:25:14 allosaurus kernel: NOHZ: local_softirq_pending 08 May 11 22:30:31 allosaurus kernel: INFO: task kworker/1:2:10776 blocked for more than 120 seconds. May 11 22:30:31 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:30:31 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:30:31 allosaurus kernel: kworker/1:2 D 0 10776 2 0x80004000 May 11 22:30:31 allosaurus kernel: Workqueue: events rtl_work_func_t [r8152] May 11 22:30:31 allosaurus kernel: Call Trace: May 11 22:30:31 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:30:31 allosaurus kernel: schedule+0x42/0xb0 May 11 22:30:31 allosaurus kernel: rpm_resume+0x174/0x780 May 11 22:30:31 allosaurus kernel: ? wait_woken+0x80/0x80 May 11 22:30:31 allosaurus kernel: rpm_resume+0x31d/0x780 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_xtra+0x1c5/0x5c0 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x40/0x70 May 11 22:30:31 allosaurus kernel: ? __switch_to_asm+0x34/0x70 May 11 22:30:31 allosaurus kernel: __pm_runtime_resume+0x52/0x80 May 11 22:30:31 allosaurus kernel: usb_autopm_get_interface+0x1d/0x50 May 11 22:30:31 allosaurus kernel: rtl_work_func_t+0x70/0x285 [r8152] May 11 22:30:31 allosaurus kernel: ? __schedule+0x2c1/0x6c0 May 11 22:30:31 allosaurus kernel: process_one_work+0x1db/0x380 May 11 22:30:31 allosaurus kernel: worker_thread+0x4d/0x400 May 11 22:30:31 allosaurus kernel: kthread+0x104/0x140 May 11 22:30:31 allosaurus kernel: ? process_one_work+0x380/0x380 May 11 22:30:31 allosaurus kernel: ? kthread_park+0x80/0x80 May 11 22:30:31 allosaurus kernel: ret_from_fork+0x35/0x40 May 11 22:31:34 allosaurus kernel: usb 2-2: USB disconnect, device number 2 May 11 22:32:32 allosaurus kernel: INFO: task NetworkManager:1470 blocked for more than 120 seconds. May 11 22:32:32 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:32:32 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:32:32 allosaurus kernel: NetworkManager D 0 1470 1 0x00000000 May 11 22:32:32 allosaurus kernel: Call Trace: May 11 22:32:32 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:32:32 allosaurus kernel: schedule+0x42/0xb0 May 11 22:32:32 allosaurus kernel: schedule_preempt_disabled+0xe/0x10 May 11 22:32:32 allosaurus kernel: __mutex_lock.isra.0+0x182/0x4f0 May 11 22:32:32 allosaurus kernel: __mutex_lock_slowpath+0x13/0x20 May 11 22:32:32 allosaurus kernel: mutex_lock+0x2e/0x40 May 11 22:32:32 allosaurus kernel: rtnl_lock+0x15/0x20 May 11 22:32:32 allosaurus kernel: nl80211_dump_scan+0x34/0x6d0 [cfg80211] May 11 22:32:32 allosaurus kernel: ? __kmalloc_reserve.isra.0+0x31/0x90 May 11 22:32:32 allosaurus kernel: genl_lock_dumpit+0x33/0x50 May 11 22:32:32 allosaurus kernel: netlink_dump+0x18b/0x380 May 11 22:32:32 allosaurus kernel: __netlink_dump_start+0x191/0x200 May 11 22:32:32 allosaurus kernel: genl_family_rcv_msg+0x2f3/0x470 May 11 22:32:32 allosaurus kernel: ? genl_lock_dumpit+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? genl_lock_done+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? genl_unlock+0x20/0x20 May 11 22:32:32 allosaurus kernel: ? __alloc_skb+0x84/0x1d0 May 11 22:32:32 allosaurus kernel: ? do_sys_poll+0x415/0x530 May 11 22:32:32 allosaurus kernel: genl_rcv_msg+0x4c/0xa0 May 11 22:32:32 allosaurus kernel: ? genl_family_rcv_msg+0x470/0x470 May 11 22:32:32 allosaurus kernel: netlink_rcv_skb+0x50/0x120 May 11 22:32:32 allosaurus kernel: genl_rcv+0x29/0x40 May 11 22:32:32 allosaurus kernel: netlink_unicast+0x187/0x220 May 11 22:32:32 allosaurus kernel: netlink_sendmsg+0x222/0x3e0 May 11 22:32:32 allosaurus kernel: sock_sendmsg+0x65/0x70 May 11 22:32:32 allosaurus kernel: ____sys_sendmsg+0x212/0x280 May 11 22:32:32 allosaurus kernel: ___sys_sendmsg+0x88/0xd0 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? set_fd_set.part.0+0x50/0x50 May 11 22:32:32 allosaurus kernel: ? ep_poll+0x294/0x420 May 11 22:32:32 allosaurus kernel: ? __fget_light+0x57/0x70 May 11 22:32:32 allosaurus kernel: __sys_sendmsg+0x5c/0xa0 May 11 22:32:32 allosaurus kernel: __x64_sys_sendmsg+0x1f/0x30 May 11 22:32:32 allosaurus kernel: do_syscall_64+0x5a/0x130 May 11 22:32:32 allosaurus kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 May 11 22:32:32 allosaurus kernel: RIP: 0033:0x7fae0d9e52ad May 11 22:32:32 allosaurus kernel: Code: Bad RIP value. May 11 22:32:32 allosaurus kernel: RSP: 002b:00007fff53453b70 EFLAGS: 00000293 ORIG_RAX: 000000000000002e May 11 22:32:32 allosaurus kernel: RAX: ffffffffffffffda RBX: 0000561c49219380 RCX: 00007fae0d9e52ad May 11 22:32:32 allosaurus kernel: RDX: 0000000000000000 RSI: 00007fff53453bc0 RDI: 000000000000000b May 11 22:32:32 allosaurus kernel: RBP: 00007fff53453bc0 R08: 0000000000000000 R09: 0000000000001000 May 11 22:32:32 allosaurus kernel: R10: 0000561c491ec010 R11: 0000000000000293 R12: 0000561c49219380 May 11 22:32:32 allosaurus kernel: R13: 0000561c49219540 R14: 00007fae0db1f280 R15: 0000561c49421370 May 11 22:32:32 allosaurus kernel: INFO: task Qt bearer threa:2482 blocked for more than 120 seconds. May 11 22:32:32 allosaurus kernel: Tainted: P OE 5.3.0-51-generic #44-Ubuntu May 11 22:32:32 allosaurus kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 11 22:32:32 allosaurus kernel: Qt bearer threa D 0 2482 1 0x00000000 May 11 22:32:32 allosaurus kernel: Call Trace: May 11 22:32:32 allosaurus kernel: __schedule+0x2b9/0x6c0 May 11 22:32:32 allosaurus kernel: schedule+0x42/0xb0 May 11 22:32:32 allosaurus kernel: schedule_preempt_disabled+0xe/0x10 May 11 22:32:32 allosaurus kernel: __mutex_lock.isra.0+0x182/0x4f0 May 11 22:32:32 allosaurus kernel: __mutex_lock_slowpath+0x13/0x20 May 11 22:32:32 allosaurus kernel: mutex_lock+0x2e/0x40 May 11 22:32:32 allosaurus kernel: __netlink_dump_start+0x59/0x200 May 11 22:32:32 allosaurus kernel: rtnetlink_rcv_msg+0x23a/0x380 May 11 22:32:32 allosaurus kernel: ? rtnl_fill_ifinfo+0xe80/0xe80 May 11 22:32:32 allosaurus kernel: ? rtnl_fill_ifinfo+0xe80/0xe80 May 11 22:32:32 allosaurus kernel: ? rtnl_calcit.isra.0+0x100/0x100 May 11 22:32:32 allosaurus kernel: netlink_rcv_skb+0x50/0x120 May 11 22:32:32 allosaurus kernel: rtnetlink_rcv+0x15/0x20 May 11 22:32:32 allosaurus kernel: netlink_unicast+0x187/0x220 May 11 22:32:32 allosaurus kernel: netlink_sendmsg+0x222/0x3e0 May 11 22:32:32 allosaurus kernel: sock_sendmsg+0x65/0x70 May 11 22:32:32 allosaurus kernel: __sys_sendto+0x113/0x190 May 11 22:32:32 allosaurus kernel: ? fd_install+0x27/0x30 May 11 22:32:32 allosaurus kernel: ? __sys_socket+0x9e/0xf0 May 11 22:32:32 allosaurus kernel: __x64_sys_sendto+0x29/0x30 May 11 22:32:32 allosaurus kernel: do_syscall_64+0x5a/0x130 May 11 22:32:32 allosaurus kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 May 11 22:32:32 allosaurus kernel: RIP: 0033:0x7f07df539dfa May 11 22:32:32 allosaurus kernel: Code: Bad RIP value. After observing this issue, I attempted to upgrade to mainline image "linux-image-unsigned-5.6.11-050611-generic" from https://kernel.ubuntu.com/~kernel-ppa/mainline/ and this fixed the issue (although the device continually reconnects). See the corresponding kernel logs below for comparison against the above: May 12 19:12:00 allosaurus kernel: usb 4-1.2: new SuperSpeed Gen 1 USB device number 16 using xhci_hcd May 12 19:12:00 allosaurus kernel: usb 4-1.2: New USB device found, idVendor=2357, idProduct=0601, bcdDevice=30.00 May 12 19:12:00 allosaurus kernel: usb 4-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=6 May 12 19:12:00 allosaurus kernel: usb 4-1.2: Product: USB 10/100/1000 LAN May 12 19:12:00 allosaurus kernel: usb 4-1.2: Manufacturer: TP-LINK May 12 19:12:00 allosaurus kernel: usb 4-1.2: SerialNumber: 000001000000 May 12 19:12:00 allosaurus kernel: usb 4-1.2: reset SuperSpeed Gen 1 USB device number 16 using xhci_hcd May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0: Direct firmware load for rtl_nic/rtl8153a-3.fw failed with error -2 May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0: unable to load firmware patch rtl_nic/rtl8153a-3.fw (-2) May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0 eth0: v1.11.11 May 12 19:12:00 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: renamed from eth0 May 12 19:12:03 allosaurus kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enxd03745081b4b: link becomes ready May 12 19:12:03 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier on May 12 19:12:03 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier off May 12 19:12:06 allosaurus kernel: r8152 4-1.2:1.0 enxd03745081b4b: carrier on May 12 19:12:42 allosaurus kernel: usb 4-1.2: USB disconnect, device number 16 (I note that these mainline logs recur at least once per minute, but I suspect that when I am able to fetch an up-to-date firmware package the latest packege will address this; not yet confirmed). 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