** Description changed: - The systemd-udevd proccess consumes 100% of a thread everytime, but i'm - not noticing any difference in my computer. + [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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1759836 Title: systemd-udevd consumes 100% of CPU due to hid2hci udev rule from bluez To manage notifications about this bug go to: https://bugs.launchpad.net/kernel/+bug/1759836/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
