kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

We can perform a kernel bisect to identify the commit that introduced
this regression.  Do you happen to know the last kernel version that did
not exhibit this bug?  If not, can you test the following kernels:

v3.11-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc1-saucy/
v3.11-rc2: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc2-saucy/
v3.11-rc3: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc3-saucy/
v3.11-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc4-saucy/

You don't have to test every kernel, just up until the kernel that first
has this bug.


Thanks in advance!


** Tags added: performing-bisect

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https://bugs.launchpad.net/bugs/1213917

Title:
  kworker thread consuming 99.8 - 100% CPU after update

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After updating today (hadn't updated for a while), my fan won't stop
  and top is showing:

    PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
      4 root      20   0     0    0    0 R 100,2  0,0  36:42.35 kworker/0:0

  Edit: seems related to bug 1214071. I can reproduce with:

  1) Start with a fresh reboot
  2) suspend and resume

  At this point after the successful resume, kworker thread starts
  consuming 100% cpu and I can no longer suspend (bug 1214071).

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-2-generic 3.11.0-2.5
  ProcVersionSignature: Ubuntu 3.11.0-2.5-generic 3.11.0-rc5
  Uname: Linux 3.11.0-2-generic x86_64
  ApportVersion: 2.12-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  michael    2372 F.... pulseaudio
  Date: Mon Aug 19 14:39:57 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=1efd421f-ac68-455b-b4d4-8912fa02494d
  MachineType: ASUSTeK COMPUTER INC. X201EP
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-2-generic.efi.signed root=UUID=05643352-201b-43e8-976a-c1d40d591e80 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-2-generic N/A
   linux-backports-modules-3.11.0-2-generic  N/A
   linux-firmware                            1.113
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/04/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X201EP.209
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X201EP
  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.:bvrX201EP.209:bd02/04/2013:svnASUSTeKCOMPUTERINC.:pnX201EP:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX201EP:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X201EP
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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