Mike - checking if you have found a workaround or any temporary fix for this issue ? I have faced the same problem on an R410 with iDRAC running trusty kernel.
Following are the logs from my server: [3903494.645100] usb 5-2: reset full-speed USB device number 2 using uhci_hcd [3903499.760216] usb 5-2: device descriptor read/64, error -110 [3903499.984358] usb 5-2: device descriptor read/64, error -71 [3903500.200497] usb 5-2: reset full-speed USB device number 2 using uhci_hcd [3903500.320567] usb 5-2: device descriptor read/64, error -71 [3903500.544709] usb 5-2: device descriptor read/64, error -71 [3903500.760848] usb 5-2: reset full-speed USB device number 2 using uhci_hcd [3903501.169123] usb 5-2: device not accepting address 2, error -71 [3903501.281153] usb 5-2: reset full-speed USB device number 2 using uhci_hcd [3903501.689411] usb 5-2: device not accepting address 2, error -71 [3903501.689842] usb 5-2: USB disconnect, device number 2 [3903717.219659] INFO: task khubd:119 blocked for more than 120 seconds. [3903717.220045] Not tainted 3.13.0-100-generic #147-Ubuntu [3903717.220441] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [3903717.220975] khubd D ffff88012b293180 0 119 2 0x00000000 [3903717.220980] ffff880128f85c80 0000000000000046 ffff880128ece000 0000000000013180 [3903717.220984] ffff880128f85fd8 0000000000013180 ffff880128ece000 ffff8801253da0e8 [3903717.220988] ffff8801253da0ec ffff880128ece000 00000000ffffffff ffff8801253da0f0 [3903717.220992] Call Trace: [3903717.221002] [<ffffffff8172ee59>] schedule_preempt_disabled+0x29/0x70 [3903717.221006] [<ffffffff81730c95>] __mutex_lock_slowpath+0x135/0x1b0 [3903717.221010] [<ffffffff81730d2f>] mutex_lock+0x1f/0x2f [3903717.221016] [<ffffffff81544894>] usb_disconnect+0x64/0x200 [3903717.221019] [<ffffffff81547483>] hub_port_connect_change+0xd3/0xb30 [3903717.221023] [<ffffffff81541fcd>] ? hub_port_status+0xdd/0x120 [3903717.221026] [<ffffffff815483b4>] hub_events+0x4d4/0xa20 [3903717.221030] [<ffffffff81548935>] hub_thread+0x35/0x150 [3903717.221034] [<ffffffff810adad0>] ? prepare_to_wait_event+0x100/0x100 [3903717.221037] [<ffffffff81548900>] ? hub_events+0xa20/0xa20 [3903717.221041] [<ffffffff8108dc79>] kthread+0xc9/0xe0 [3903717.221045] [<ffffffff8108dbb0>] ? kthread_create_on_node+0x1c0/0x1c0 [3903717.221050] [<ffffffff8173afa8>] ret_from_fork+0x58/0x90 [3903717.221053] [<ffffffff8108dbb0>] ? kthread_create_on_node+0x1c0/0x1c0 [3903717.221064] INFO: task kworker/2:1:12543 blocked for more than 120 seconds. [3903717.221495] Not tainted 3.13.0-100-generic #147-Ubuntu [3903717.221828] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [3903717.222285] kworker/2:1 D ffff88012b253180 0 12543 2 0x00000000 [3903717.222299] Workqueue: events hid_reset [usbhid] [3903717.222301] ffff880036091850 0000000000000046 ffff8800c4c40000 0000000000013180 [3903717.222304] ffff880036091fd8 0000000000013180 ffff8800c4c40000 ffff880036091998 [3903717.222308] ffff8800360919a0 7fffffffffffffff ffff8800c4c40000 ffff8800c4c40000 [3903717.222312] Call Trace: [3903717.222315] [<ffffffff8172e949>] schedule+0x29/0x70 [3903717.222318] [<ffffffff8172db99>] schedule_timeout+0x279/0x310 [3903717.222323] [<ffffffff810a16f8>] ? __enqueue_entity+0x78/0x80 [3903717.222327] [<ffffffff810a7b2d>] ? enqueue_entity+0x2ad/0xc00 [3903717.222331] [<ffffffff8172f456>] wait_for_completion+0xa6/0x150 [3903717.222336] [<ffffffff8109d2f0>] ? wake_up_state+0x20/0x20 ... ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1557172 Title: khubd/usbhid deadlock(?) creates processes in state D To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1557172/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
