@brad-figg: I ran the command you asked me to. I was able to successfully launch vncserver and run apport-collect in that. I presume the command failed since it showed a backtrace in python and a long html output. dpkg also warned me that package 'linux' was not found. I'm attaching the full logs containing the output of apport-collect 1603564
** Attachment added: "Output of apport-collect 1603564" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1603564/+attachment/4704146/+files/dump.txt -- 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/1603564 Title: USB unplug crashes system - Assuming host is dying, halting host Status in linux package in Ubuntu: Incomplete Bug description: Occasionally, when I unplug my Android phone (connected over USB), my machine crashes. At first, I presumed the entire machine had halted since the keyboard and mouse stopped working. However, I'm still able to SSH in although the screen is completely non-responsive. Pressing the power button on the CPU seems to bring up a window with Ubuntu's power options. My Ubuntu version: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.4 LTS Release: 14.04 Codename: trusty Kernel version: Linux nixentor 3.13.0-91-generic #138-Ubuntu SMP Fri Jun 24 17:00:34 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux I see the following output on dmesg: [15563.650717] ------------[ cut here ]------------ [15563.650730] WARNING: CPU: 7 PID: 0 at /build/linux-3r7mVb/linux-3.13.0/drivers/usb/host/xhci-ring.c:1590 handle_cmd_completion+0xe56/0xe60() [15563.650732] Modules linked in: qcserial usb_wwan usbserial ip6table_filter ip6_tables iptable_filter ip_tables x_tables cachefiles cfg80211 rfcomm bnep nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache snd_hda_codec_hdmi btusb bluetooth usb_storage mxm_wmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd uvcvideo videobuf2_vmalloc videobuf2_memops joydev videobuf2_core snd_hda_codec_realtek videodev snd_usb_audio snd_usbmidi_lib 8812au(OX) snd_seq_midi snd_seq_midi_event snd_rawmidi snd_hda_intel snd_hda_codec snd_seq serio_raw snd_hwdep radeon snd_pcm mei_me snd_page_alloc mei snd_seq_device snd_timer snd ttm drm_kms_helper soundcore drm parport_pc i2c_algo_bit ppdev lp wmi parport video intel_smartconnect shpchp acpi_pad mac_hid hid_generic usbhid hid e1000e ahci psmouse ptp libahci pps_core [15563.650804] CPU: 7 PID: 0 Comm: swapper/7 Tainted: G OX 3.13.0-91-generic #138-Ubuntu [15563.650807] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z97 Extreme4, BIOS P1.30 05/23/2014 [15563.650809] 0000000000000000 ffff88041edc3d90 ffffffff81729906 0000000000000000 [15563.650813] 0000000000000009 ffff88041edc3dc8 ffffffff8106987d ffff880404062d60 [15563.650817] ffff8804040606b0 0000000000000010 00000004040606b0 ffff8804041a0000 [15563.650822] Call Trace: [15563.650824] <IRQ> [<ffffffff81729906>] dump_stack+0x64/0x82 [15563.650836] [<ffffffff8106987d>] warn_slowpath_common+0x7d/0xa0 [15563.650840] [<ffffffff8106995a>] warn_slowpath_null+0x1a/0x20 [15563.650845] [<ffffffff815848c6>] handle_cmd_completion+0xe56/0xe60 [15563.650852] [<ffffffff8109aa65>] ? check_preempt_curr+0x75/0xa0 [15563.650857] [<ffffffff815861eb>] xhci_irq+0x33b/0xa50 [15563.650861] [<ffffffff8109fe35>] ? sched_clock_cpu+0xb5/0x100 [15563.650865] [<ffffffff81586911>] xhci_msi_irq+0x11/0x20 [15563.650870] [<ffffffff810c27be>] handle_irq_event_percpu+0x4e/0x220 [15563.650874] [<ffffffff810c29cd>] handle_irq_event+0x3d/0x60 [15563.650878] [<ffffffff810c5497>] handle_edge_irq+0x77/0x130 [15563.650886] [<ffffffff81016e3e>] handle_irq+0x1e/0x30 [15563.650893] [<ffffffff8173c79d>] do_IRQ+0x4d/0xc0 [15563.650898] [<ffffffff81731e2d>] common_interrupt+0x6d/0x6d [15563.650900] <EOI> [<ffffffff815daaf2>] ? cpuidle_enter_state+0x52/0xc0 [15563.650910] [<ffffffff815daae8>] ? cpuidle_enter_state+0x48/0xc0 [15563.650915] [<ffffffff815dac3c>] cpuidle_idle_call+0xdc/0x220 [15563.650921] [<ffffffff8101e3fe>] arch_cpu_idle+0xe/0x30 [15563.650924] [<ffffffff810c1be1>] cpu_startup_entry+0xc1/0x2b0 [15563.650931] [<ffffffff8104278d>] start_secondary+0x21d/0x2d0 [15563.650934] ---[ end trace d9b5447d0ddb440a ]--- [15565.486066] xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command. [15565.486075] xhci_hcd 0000:00:14.0: Assuming host is dying, halting host. [15565.486120] xhci_hcd 0000:00:14.0: HC died; cleaning up [15568.853140] xhci_hcd 0000:00:14.0: Timeout while waiting for address device command [15568.853149] xhci_hcd 0000:00:14.0: Abort the command ring, but the xHCI is dead. [15569.057055] usb 3-14: device not accepting address 92, error -108 [15574.055575] xhci_hcd 0000:00:14.0: Timeout while waiting for a slot [15574.055587] xhci_hcd 0000:00:14.0: Abort the command ring, but the xHCI is dead. [15579.054167] xhci_hcd 0000:00:14.0: Timeout while waiting for a slot [15579.054176] xhci_hcd 0000:00:14.0: Abort the command ring, but the xHCI is dead. [15584.052706] xhci_hcd 0000:00:14.0: Timeout while waiting for a slot [15584.052715] xhci_hcd 0000:00:14.0: Abort the command ring, but the xHCI is dead. [15584.052841] usb 3-3: USB disconnect, device number 2 [15584.052854] usb 3-3.2: USB disconnect, device number 13 [15584.085404] usb 3-4: USB disconnect, device number 3 [15584.108793] usb 3-6: USB disconnect, device number 8 [15584.164694] usb 3-7: USB disconnect, device number 9 [15584.165426] usb 3-8: USB disconnect, device number 10 [15584.165634] usb 3-9: USB disconnect, device number 11 --- ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: guru 2492 F.... pulseaudio /dev/snd/controlC0: guru 2492 F.... pulseaudio DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=bebe3ee7-4a81-4980-93ee-80daafd63772 InstallationDate: Installed on 2014-05-04 (808 days ago) InstallationMedia: This MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. Package: linux (not installed) ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-92-generic root=UUID=2e88994f-d021-4c26-a209-6b1a3aece4fc ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.13.0-92.139-generic 3.13.11-ckt39 RelatedPackageVersions: linux-restricted-modules-3.13.0-92-generic N/A linux-backports-modules-3.13.0-92-generic N/A linux-firmware 1.127.22 RfKill: 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: trusty Uname: Linux 3.13.0-92-generic x86_64 UpgradeStatus: Upgraded to trusty on 2014-08-24 (696 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/23/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.30 dmi.board.name: Z97 Extreme4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.30:bd05/23/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ97Extreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. 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