Comment 8 for bug 1577024

Thank you. I have one last question on this bug. Where can I find current information on merge window dates, etc? I'm trying to create a rough estimate as to when these changes will become part of a security update that gets auto deployed via the "software update" apt gui to desktop users.


Matthew Giassa, MASc, BASc, EIT
Security and Embedded Systems Specialist
 e-mail:   <email address hidden>
  Original Message
From: Kamal Mostafa
Sent: Friday, May 27, 2016 7:05 AM
To: <email address hidden>
Reply To: Bug 1577024
Subject: [Bug 1577024] Re: Kernel 4.2.X and 4.4.X - Fix USB3.0 link power management (LPM) claim/release logic in USBFS

** Changed in: linux (Ubuntu Vivid)
Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Wily)
Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed

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Kernel 4.2.X and 4.4.X - Fix USB3.0 link power management (LPM)
claim/release logic in USBFS

Status in linux package in Ubuntu:
Status in linux source package in Vivid:
Fix Committed
Status in linux source package in Wily:
Fix Committed
Status in linux source package in Xenial:
Fix Committed

Bug description:
I am currently carrying out kernel testing and debugging with Alan Stern on the mainline kernel. Alan has proposed a patch to resolve a bug in USBFS that causes USB machine vision cameras to fail on kernels that contain the following patch:
commit e951f84074b84a3f5aecbffd01da74576e0068d5
Author: Lu Baolu <email address hidden>
Date: Tue Jun 16 09:08:26 2015 +0800
usb: core: lpm: set lpm_capable for root hub device
commit 2d2a316765d956bc5cb6bb367b2ec52ca59ab8e9 upstream.

There is an issue in this patch that impacts software that rapidly
issues claim/release calls in USBFS, and all of our customers that use
Ubuntu 14.04.4 (kernel 4.2.x) and Ubuntu 16.04 (kernel 4.4.x) are
unable to communicate with their machine vision cameras using our
software stack.

The patch for the mainline kernel is being tested, and is currently posted, along with a history of this issue, at:

Right now, all of our customers have to either use an older kernel, or
manually patch their own kernel with the fix provided by Alan if they
are required to use a newer kernel. I am raising this bug so that,
once the patch is submitted to the the mainline/linus series, it can
be included in the next "monthly" kernel update made available to the
general public, and so our customers can just run a normal "vanilla"
system without having to rely on manually patching their kernel every
time they need to update.

I can be contacted at:
<email address hidden>
<email address hidden>

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-55-generic 3.13.0-55.94
ProcVersionSignature: Ubuntu 3.13.0-55.94-generic 3.13.11-ckt20
Uname: Linux 3.13.0-55-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
/dev/snd/controlC0: owner 4035 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Apr 30 10:36:15 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=0287e25d-68d6-4390-aced-c682b8e13b60
InstallationDate: Installed on 2013-09-23 (949 days ago)
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release i386 (20130820.1)
lo no wireless extensions.

cscotun0 no wireless extensions.

eth0 no wireless extensions.
MachineType: Hewlett-Packard HP xw4600 Workstation

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-55-generic root=UUID=292845c9-c333-4592-aa06-bc01f45d3ee6 ro quiet splash
linux-restricted-modules-3.13.0-55-generic N/A
linux-backports-modules-3.13.0-55-generic N/A
linux-firmware 1.127.19

SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-07-30 (639 days ago) 07/09/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786F3 v01.34
dmi.board.asset.tag: CAC94101JZ 0AA0h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CAC94101JZ
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786F3v01.34:bd07/09/2012:svnHewlett-Packard:pnHPxw4600Workstation:pvr:rvnHewlett-Packard:rn0AA0h:rvr:cvnHewlett-Packard:ct6:cvr: HP xw4600 Workstation
dmi.sys.vendor: Hewlett-Packard

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