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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

The kernel log shows huge gaps in device detection, apparently the
hardware gets locked up during USB detection/enumeration?

[    7.292422] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input16
[   10.918992] usb 1-3: device descriptor read/all, error -110
[   11.031084] usb 1-3: new high-speed USB device number 3 using xhci_hcd
[   21.173998] usb 1-3: device descriptor read/all, error -110
[   21.286076] usb 1-3: new high-speed USB device number 4 using xhci_hcd
[   26.309502] usb 1-3: device descriptor read/8, error -110
[   31.436986] usb 1-3: device descriptor read/8, error -110
[   31.653231] usb 1-3: new high-speed USB device number 5 using xhci_hcd
[   36.676659] usb 1-3: device descriptor read/8, error -110
[   41.804074] usb 1-3: device descriptor read/8, error -110
[   41.908224] usb usb1-port3: unable to enumerate USB device
[   42.020384] usb 1-9: new low-speed USB device number 6 using xhci_hcd

Could you try disconnecting as many USB devices as possible, see whether
that helps, and then re-connect them one by one to see which one is the
culprit? This might be a hardware or kernel bug, I don't know yet.

** No longer affects: friendly-recovery (Ubuntu)

** Package changed: systemd (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- systemd-udev-settle stalls booting
+ boot stalls on USB detection errors

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https://bugs.launchpad.net/bugs/1437492

Title:
  boot stalls on USB detection errors

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My system boots slow. I investigated this and it seems systemd-udev-settle.service is the culprit.
  My system runs ext4 with GPT on UEFI.
  I do not use encryption or LVM.

  $ journalctl -u systemd-udev-settle
  -- Logs begin at fri 2015-03-27 19:03:06 CET, end at fri 2015-03-27 22:06:32 CET. --
  mar 27 19:03:42 hostname systemd[1]: Started udev Wait for Complete Device Initialization.

  $ systemd-analyze
  Startup finished in 14.865s (firmware) + 11.133s (loader) + 6.127s (kernel) + 42.079s (userspace) = 1min 14.206s

  $ systemd-analyze critical-chain
  http://paste.ubuntu.com/10691416/

  $ systemd-analyze blame
  36.013s systemd-udev-settle.service
  http://paste.ubuntu.com/10691314/

  $ systemctl show systemd-udev-settle.service -p RequiredBy
  RequiredBy=

  $ systemctl show systemd-udev-settle.service -p WantedBy
  WantedBy=friendly-recovery.service

  $ systemd-analyze plot > boot.svg
  http://imgh.us/boot_1.svg

  $ systemd-analyze dump
  http://paste.ubuntu.com/10691856/

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-5ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Fri Mar 27 22:05:28 2015
  InstallationDate: Installed on 2013-12-26 (455 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: ASUS All Series
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-10-generic.efi.signed root=UUID=31dc4488-28d4-4d2a-aa51-6733e237d5f8 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/18/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2103
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87-PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2103:bd08/18/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87-PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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