kernel-packages team mailing list archive

[Michael Nelson <1213917@xxxxxxxxxxxxxxxxxx>]

Surprise :/, here are the steps that I took (perhaps it'll give you some
information showing my mistake):

1) I downloaded and installed all the debs - note missing linux-tools:
https://pastebin.canonical.com/99199/

2) Tested:

$ uname -a
Linux michael-X201EP 3.11.0-12-generic #19~lp1213917v1 SMP Wed Oct 16 16:05:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Good (suspend/resume without kworker issues), BUT, I didn't get a wifi
connection at all (even before suspend):.

3) So I apt-get -f to add linux-tools, and then ensured the lp1213917
versions were all still valid: https://pastebin.canonical.com/99211/

4) The network issue was still there and seemed to be apparmor related:
https://pastebin.canonical.com/99208/ Figuring that the network issue
may be related to an apparmor update I was missing or similar, I
installed the archive versions of 3.11.0-12 to verify that I'd have the
same issue there (which I did - no network at all):
https://pastebin.canonical.com/99210/.

What I didn't do at that point, but should have in retrospect, was
confirmed that suspend/resume still triggered the kworker issue.

5) I did a dist-upgrade which was huge - as I'd stopped updating after a
few rounds of the bisect (I can put it on chinstrap if it's useful -
note-to-self, starts at 2013-10-17 10:56:46), and sure enough, the
network issue is fixed, but to my surprise, so is the kworker issue:

$ uname -a
Linux michael-X201EP 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Good.

If there's something obvious that I did incorrectly, or it's obvious to
you where an update may have fixed the issue, please let me know. Sorry
for apparently wasting time here :/

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

Title:
  kworker thread 99.8 - 100% CPU after 1st suspend - no second suspend

Status in “linux” package in Ubuntu:
  Incomplete

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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