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https://bugs.launchpad.net/bugs/1759836

Title:
  systemd-udevd consumes 100% of CPU due to hid2hci udev rule from bluez

Status in linux:
  Confirmed
Status in The Ubuntu Power Consumption Project:
  New
Status in bluez package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Invalid
Status in bluez source package in Bionic:
  Fix Committed
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Invalid
Status in bluez source package in Disco:
  Fix Released
Status in linux source package in Disco:
  Invalid
Status in systemd source package in Disco:
  Invalid
Status in bluez source package in Eoan:
  Fix Released
Status in linux source package in Eoan:
  Invalid
Status in systemd source package in Eoan:
  Invalid
Status in bluez package in Debian:
  New

Bug description:
  [impact]

  on specific Dell systems, with a specific usb bluetooth device built-
  in, the udev rule 'hid2hci' provided by the 'bluez' package causes an
  endless loop of uevents resulting from 'bind' or 'unbind' kernel
  uevents.  These new events were added to the kernel after the
  'hid2hci' udev rule was written.

  [test case]

  the specific Dell system is required to be able to reproduce this, or
  at least the specific usb bluetooth hardware included in that system.

  Reproducing this is reportedly easy, for example comment 75 indicates
  it happens on every boot.

  When this happens, any process monitor (e.g. ps, top, etc) will show
  the 'udevd' process using 100% of a cpu, and 'udevadm monitor' should
  show repeated 'bind' and 'unbind' events as mentioned in comment 39.

  [regression potential]

  as this alters what kernel uevents the 'hid2hci' udev rule processes,
  regressions would involve the affected usb bluetooth device failing to
  be set up, or otherwise not processing the uevents correctly.

  [other info]

  this is not fixed yet upstream, as of my last check, but has been
  submitted upstream as mentioned in comment 95.

  
  original description:

  --

  
  The systemd-udevd proccess consumes 100% of a thread everytime, but i'm not 
noticing any difference in my computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu6
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Mar 29 08:52:54 2018
  InstallationDate: Installed on 2018-03-05 (23 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180304)
  MachineType: Dell Inc. Inspiron N5010
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=3c29e292-f1ae-45e1-a0ed-a82524278ce1 ro quiet splash vt.handoff=1
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user@.service → 
/lib/systemd/system/user@.service.d/timeout.conf

   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 08R0GW
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A12
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A12
  dmi.modalias: 
dmi:bvnDellInc.:bvrA12:bd01/25/2011:svnDellInc.:pnInspironN5010:pvrA12:rvnDellInc.:rn08R0GW:rvrA12:cvnDellInc.:ct8:cvrA12:
  dmi.product.name: Inspiron N5010
  dmi.product.version: A12
  dmi.sys.vendor: Dell Inc.

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