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I think this is due to the backporting of the 3 commits in this thread:
https://groups.google.com/forum/#!msg/linux.kernel/e4tcY4cvHGg/tLZi97S02a0J
3.14 needs the fixes from this thread as well
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https://bugs.launchpad.net/bugs/1498070
Title:
systemd-udevd high CPU usage
Status in linux package in Ubuntu:
Confirmed
Bug description:
I got high CPU usage with systemd-udevd, 100% in the 8 threads. It
happened 2 times.
Xubuntu 14.04, kernel 3.14.52-031452-generic.
KiB Swap: 4194300 total, 218436 used, 3975864 free. 2361304 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21485 root 20 0 51780 1148 516 R 97,7 0,0 2:53.79 systemd-udevd
21534 root 20 0 52704 1532 168 R 95,4 0,0 0:16.19 systemd-udevd
21496 root 20 0 52176 1000 168 R 33,2 0,0 2:11.88 systemd-udevd
21495 root 20 0 52176 1136 300 R 32,9 0,0 2:19.32 systemd-udevd
21536 root 20 0 52704 1532 168 R 32,6 0,0 0:06.07 systemd-udevd
21525 root 20 0 52704 1532 168 R 29,9 0,0 0:27.81 systemd-udevd
21529 root 20 0 52704 1532 168 R 29,6 0,0 0:19.85 systemd-udevd
21487 root 20 0 51780 820 308 R 28,6 0,0 2:51.56 systemd-udevd
21506 root 20 0 52704 1532 168 R 28,6 0,0 0:53.19 systemd-udevd
21533 root 20 0 52704 1532 168 R 27,9 0,0 0:08.06 systemd-udevd
21500 root 20 0 52572 1364 168 R 26,6 0,0 1:31.77 systemd-udevd
21505 root 20 0 52704 1532 168 R 26,6 0,0 1:00.96 systemd-udevd
21528 root 20 0 52704 1532 168 R 26,3 0,0 0:25.09 systemd-udevd
21499 root 20 0 52572 1364 168 R 24,9 0,0 1:15.30 systemd-udevd
21501 root 20 0 52572 1364 168 R 24,9 0,0 1:41.89 systemd-udevd
21507 root 20 0 52704 1532 168 R 24,9 0,0 0:49.58 systemd-udevd
21535 root 20 0 52704 1532 168 R 24,9 0,0 0:08.21 systemd-udevd
21498 root 20 0 52572 1364 168 R 24,6 0,0 1:51.32 systemd-udevd
21508 root 20 0 52704 1532 168 R 24,6 0,0 1:15.18 systemd-udevd
21522 root 20 0 52704 1784 340 R 24,6 0,0 0:59.88 systemd-udevd
4533 sergio 20 0 2129052 604312 65552 S 3,0 7,6 16:20.87 firefox
24962 sergio 20 0 815400 29356 15628 S 1,7 0,4 66:42.11 gnome-system-mo
1514 root 20 0 611140 145692 91372 S 1,3 1,8 121:58.81 Xorg
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: udev 204-5ubuntu20.13
Uname: Linux 3.14.52-031452-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.13
Architecture: amd64
CustomUdevRuleFiles: 99-evdev.rules
Date: Mon Sep 21 12:38:09 2015
InstallationDate: Installed on 2014-05-26 (483 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
MachineType: ASUSTeK COMPUTER INC. X750JB
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.14.52-031452-generic root=UUID=1661f37a-c72d-46a6-a746-d0160ec6e57c ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/14/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X750JB.208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X750JB
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX750JB.208:bd08/14/2013:svnASUSTeKCOMPUTERINC.:pnX750JB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX750JB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X750JB
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
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