MainlineBuilds

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Generally Ubuntu systems run with the stock Ubuntu kernels. However it is handy to be able to test with unmodified mainline kernels to help locate problems in the Ubuntu kernel patches, or to confirm that upstream has fixed the issue. To this end we now offer mainline kernel builds. These mainline kernels are made from unmodified kernel source but using the Ubuntu kernel configuration files. These are then packaged as Ubuntu .deb files for simple installation. = Introduction =
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We currently build four sets of mainline kernels,
two sets from Linus' tree, two sets from [[http://dri.freedesktop.org/wiki/DRM|DRM]]-development repositories, and one from a combined [[git://git.kernel.org/pub/scm/linux/kernel/git/smb/linux-2.6.32.y-drm33.z.git|v2.6.32.x/v2.6.33.y]] stable tree.
By default, Ubuntu systems run with the Ubuntu kernels provided by the Ubuntu repositories. However it is handy to be able to test with unmodified upstream kernels to help locate problems in the Ubuntu kernel patches, or to confirm that upstream has fixed a specific issue. To this end we now offer select upstream kernel builds. These kernels are made from unmodified kernel source but using the Ubuntu kernel configuration files. These are then packaged as Ubuntu .deb files for simple installation.
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From [[http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=summary|Linus' tree]] we build: These kernels are not supported and are not appropriate for production use.
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 1. all formally tagged releases including -rcN
 2. the tip of the tree (master head) daily
= Upstream kernels archive =
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The DRM-development builds are: The upstream kernels archive is located at the URL below. There is a directory for each build. Note, if you are testing for a bug, please do not use the daily folder, but use the latest mainline kernel at the top:
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 1. the tip of the [[http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=shortlog;h=refs/heads/drm-next|drm-next]] head of Dave Airlie's [[http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=summary|drm-2.6]] repository daily
 2. the tip of the [[http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=shortlog;h=refs/heads/drm-intel-next|drm-intel-next]] head of Eric Anholt's [[http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=summary|drm-intel]] repository daily
  [[http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D|http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D]]
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For v2.6.32 kernel series, we build an additional set of kernels:
 
 1. tags from the combined [[http://git.kernel.org/?p=linux/kernel/git/smb/linux-2.6.32.y-drm33.z.git;a=summary|v2.6.32.x.y]] tree (by StefanBader) which is v2.6.32.x with DRM from 2.6.33.y
The tagged releases (as made by Linus and the stable maintainers) are found under a directory matching their tag name and which kernel configuration they were built with (<tag>-<series>). Daily tip of the tree builds are found in the {{{daily}}} sub-directory named for the date they were made.
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This makes these kernels closer to the Lucid kernels which are based on 2.6.32 kernels with DRM backported from the 2.6.33 series. Each build directory contains the header and image .deb files for the generic flavour i386 and amd64 architectures.
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= Preparing to install an upstream kernel =
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== Mainline Kernels Archive == First, if one is using select proprietary or out-of-tree modules (ex. vitualbox, nvidia, fglrx, bcmwl, etc.) unless there is an '''extra''' package available for the version you are testing, you will need to uninstall the module first, in order to test the mainline kernel. If you do not uninstall these modules first, then the upstream kernel more than likely will not boot.
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The [[http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D|mainline kernels archive]] is located at the URL below, there is a directory for each mainline build: = Installing upstream kernels =
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    {{{
http://kernel.ubuntu.com/~kernel-ppa/mainline
To boot into an upstream kernel you need to download and install the packages that corresponds to your architecture.

For example, let us use [[http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14.4-utopic/]]. <<BR>> If you are using a 32-bit/i386 architecture, you would want those marked A. <<BR>> If you are using a 64-bit/amd64 architecture, B.
<<BR>> (Use generic kernel unless the issue is only reproducible in a lowlatency kernel).

{{{
B linux-headers-3.14.4-031404-generic_3.14.4-031404.201405130853_amd64.deb
A linux-headers-3.14.4-031404-generic_3.14.4-031404.201405130853_i386.deb
   linux-headers-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_amd64.deb
   linux-headers-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_i386.deb
AB linux-headers-3.14.4-031404_3.14.4-031404.201405130853_all.deb
B linux-image-3.14.4-031404-generic_3.14.4-031404.201405130853_amd64.deb
A linux-image-3.14.4-031404-generic_3.14.4-031404.201405130853_i386.deb
   linux-image-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_amd64.deb
   linux-image-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_i386.deb
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The tagged releases are found under a directory matching their tag name and which kernel configuration they were built with (<tag>-<series>). Daily releases are found in the {{{daily}}} sub-directory named for the date they were made.

Each build directory contains the header and image .deb files for the i386 and amd64 architectures, generic flavour.

== Mainline Kernel Mapping ==

In order to choose which is the closest mainline kernel to any particular Ubuntu release you can use the [[http://kernel.ubuntu.com/~kernel-ppa/info/kernel-version-map.html|Ubuntu to mainline mapping]] table, which contains mappings from Ubuntu releases and pockets to mainline versions.

Most likely that you want to download and test against the most [[http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/|current]] version.

== Installing Mainline Kernels ==

To use the mainline kernel as-is you only only need to download and install the *image*.deb package that corresponds to your architecture, however if you need to build any external modules you also need the correct *header*.deb and *source*.deb packages.

To install, download the common headers, architecture specific headers, and the architecture specific image. For example for 2.6.27.15 we have the following files, for i386 you would need those marked with B and C, amd64 take those marked A & C:

    {{{
A linux-headers-2.6.27-02062715-generic_2.6.27-02062715_amd64.deb
B linux-headers-2.6.27-02062715-generic_2.6.27-02062715_i386.deb
C linux-headers-2.6.27-02062715_2.6.27-02062715_all.deb
A linux-image-2.6.27-02062715-generic_2.6.27-02062715_amd64.deb
B linux-image-2.6.27-02062715-generic_2.6.27-02062715_i386.deb
}}}

Once you have those downloaded they will need to be installed using dpkg:

    {{{
It is best to downloaded the files into a folder by themselves. Then, one may install all the packages simultaneously by executing the following in a terminal:
{{{
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When this process completes you should have a new entry on your boot menu representing the mainline kernel.  This will appear as an entry like this:

    
{{{
Ubuntu Intrepid, kernel 2.6.27-02062715-generic
When this process completes you should have a new entry on your boot menu representing the upstream kernel. This will appear as an entry like this:
{{{
Ubuntu Trusty, kernel 3.14.4-031404-generic
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== Uninstalling Mainline Kernels == The headers-<kernelname>_<architecture>.deb and headers-<kernelname>_all.deb packages allow one to build external modules.
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The mainline kernels have their own ABI namespace so they install side by side with the stock Ubuntu kernels (each kernel has a separate directory under /lib/modules/VERSION for example). This means that you can keep several mainline and Ubuntu stock kernels installed at the same time and select the one you need from the GRUB boot menu. = Problems installing the upstream kernel =
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If you would like to uninstall a mainline kernel anyway, first use: /!\ Some have found issues installing an upstream kernel due to an error. For example: {{{
Error! Bad return status for module build on kernel: 3.7.0-030700rc2-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.18/build/make.log for more information.
}}} This is due to how one did not follow the previous directions of uninstalling out-of-tree modules, in this case virtualbox.
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    {{{ = Uninstalling upstream kernels =

The upstream kernels have their own ABI namespace so they install side by side with the stock Ubuntu kernels (each kernel has a separate directory under /lib/modules/VERSION for example). This means that you can keep several mainline and Ubuntu stock kernels installed at the same time and select the one you need from the GRUB boot menu.

If you would like to uninstall an upstream kernel anyway, first use:
{{{
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{{{
{{{
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Remember that several packages belong to one kernel version: common headers, architecture specific headers and the architecture specific image. Remember that several packages can belong to one kernel version: common headers, architecture specific headers and the architecture specific image.
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<<Include(^Kernel/FAQ/DebuggingMainlineBuilds.*)>> = Mainline build tool chain =
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== Submitting to kerneloops.org == These kernels are built with the tool chain (gcc etc.) from the previous LTS (Ubuntu 8.04/10.04/12.04) depending on version. Therefore, out-of-tree kernel modules built with tools from other versions likely will not work. The file '''BUILD''' in later mainline builds details what was used.
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Ubuntu's default infrastructure for handling OOPSes will not work for these builds as they are external to Ubuntu. To contribute this information to kerneloops.org you will need to make a couple of changes. = Mainline kernel mapping to Ubuntu kernel =
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First, install the kerneloops-applet package which will handle the prompting and submission on any problem. Then edit /etc/kerneloops.conf and delete the ''submit-pipe'' line from the file, so that kerneloops-applet will be used. After a reboot
kerneloops-applet will then prompt you if there are any problems and you can choose to submit the information to kerneloops.org.
The Ubuntu kernel is not bit-for-bit the same as the mainline. However, one may find the upstream release that the Ubuntu kernel is based on via the [[http://people.canonical.com/~kernel/info/kernel-version-map.html|Ubuntu to mainline mapping]] table.

= Does the kernel team support the mainline kernel builds? =

The mainline kernels builds are produced for debugging purposes and therefore come with no support. Use them at your own risk.

= Where can I get the source for these builds? =

In each directory there is a COMMIT file which defines the base commit in Linus' master tree from which they were built. The patches in the same directory ????-* are applied on top of this commit to make the build tree. A mirror of Linus' tree is available from {{{git://kernel.ubuntu.com/virgin/linux.git}}}.

First download the COMMIT and patch files ????-* from the mainline build in question to a temporary directory:

    {{{
git clone git://kernel.ubuntu.com/virgin/linux.git mainline
cd mainline
git checkout -b `cat ${MAINLINE}/COMMIT`
git am ${MAINLINE}/????-*
}}}

= Verifying the mainline build binaries =

In order to allow verification that the published builds are the builds made by the mainline build system the individual files are checksummed and the results of that published as CHECKSUMS in the same directory. This file is in turn signed by the mainline builder using the GPG key below which can be obtained from the Ubuntu Keyserver:
    {{{
pub 2048R/17C622B0 2008-05-01
      Key fingerprint = 60AA 7B6F 3043 4AE6 8E56 9963 E50C 6A09 17C6 22B0
uid Kernel PPA <kernel-ppa@canonical.com>
}}}

= Upstream kernels in detail =

We currently build five sets of upstream kernels. All formal tags from Linus' tree and from the stable trees, plus:
 1. the daily tip of [[http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git|Linus' linux kernel source tree]],
 1. the tip of the [[http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-next|drm-next]] head of Dave Airlie's [[http://cgit.freedesktop.org/~airlied/linux/|linux]] repository daily,
 1. the tip of the [[http://cgit.freedesktop.org/~keithp/linux/log/?h=drm-intel-next|drm-intel-next]] head of Keith Packard's [[http://cgit.freedesktop.org/~keithp/linux/|linux]] repository daily until 2012, after which it has been [[http://blog.ffwll.ch/2012/01/new-drm-intel-next-git-tree.html|taken over]] by Daniel Vetter at [[http://cgit.freedesktop.org/drm-intel/]], and in particular, the [[http://cgit.freedesktop.org/drm-intel/log/?h=drm-intel-next|drm-intel-next]] branch,
 1. the tip of the master branch of the debloat-testing tree daily,
 1. tags from the combined [[http://git.kernel.org/?p=linux/kernel/git/smb/linux-2.6.32.y-drm33.z.git;a=summary|v2.6.32.x.y]] tree (by StefanBader) which is v2.6.32.x with DRM from 2.6.33.y.

This makes these kernels closer to the Lucid kernels which are based on 2.6.32 kernels with DRM backported from the 2.6.33 series.

Introduction

By default, Ubuntu systems run with the Ubuntu kernels provided by the Ubuntu repositories. However it is handy to be able to test with unmodified upstream kernels to help locate problems in the Ubuntu kernel patches, or to confirm that upstream has fixed a specific issue. To this end we now offer select upstream kernel builds. These kernels are made from unmodified kernel source but using the Ubuntu kernel configuration files. These are then packaged as Ubuntu .deb files for simple installation.

These kernels are not supported and are not appropriate for production use.

Upstream kernels archive

The upstream kernels archive is located at the URL below. There is a directory for each build. Note, if you are testing for a bug, please do not use the daily folder, but use the latest mainline kernel at the top:

The tagged releases (as made by Linus and the stable maintainers) are found under a directory matching their tag name and which kernel configuration they were built with (<tag>-<series>). Daily tip of the tree builds are found in the daily sub-directory named for the date they were made.

Each build directory contains the header and image .deb files for the generic flavour i386 and amd64 architectures.

Preparing to install an upstream kernel

First, if one is using select proprietary or out-of-tree modules (ex. vitualbox, nvidia, fglrx, bcmwl, etc.) unless there is an extra package available for the version you are testing, you will need to uninstall the module first, in order to test the mainline kernel. If you do not uninstall these modules first, then the upstream kernel more than likely will not boot.

Installing upstream kernels

To boot into an upstream kernel you need to download and install the packages that corresponds to your architecture.

For example, let us use http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14.4-utopic/.
If you are using a 32-bit/i386 architecture, you would want those marked A.
If you are using a 64-bit/amd64 architecture, B.
(Use generic kernel unless the issue is only reproducible in a lowlatency kernel).

B  linux-headers-3.14.4-031404-generic_3.14.4-031404.201405130853_amd64.deb
A  linux-headers-3.14.4-031404-generic_3.14.4-031404.201405130853_i386.deb
   linux-headers-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_amd64.deb
   linux-headers-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_i386.deb
AB linux-headers-3.14.4-031404_3.14.4-031404.201405130853_all.deb
B  linux-image-3.14.4-031404-generic_3.14.4-031404.201405130853_amd64.deb
A  linux-image-3.14.4-031404-generic_3.14.4-031404.201405130853_i386.deb
   linux-image-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_amd64.deb
   linux-image-3.14.4-031404-lowlatency_3.14.4-031404.201405130853_i386.deb

It is best to downloaded the files into a folder by themselves. Then, one may install all the packages simultaneously by executing the following in a terminal:

sudo dpkg -i *.deb

When this process completes you should have a new entry on your boot menu representing the upstream kernel. This will appear as an entry like this:

Ubuntu Trusty, kernel 3.14.4-031404-generic

The headers-<kernelname>_<architecture>.deb and headers-<kernelname>_all.deb packages allow one to build external modules.

Problems installing the upstream kernel

Warning /!\ Some have found issues installing an upstream kernel due to an error. For example:

Error! Bad return status for module build on kernel: 3.7.0-030700rc2-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.18/build/make.log for more information.

This is due to how one did not follow the previous directions of uninstalling out-of-tree modules, in this case virtualbox.

Uninstalling upstream kernels

The upstream kernels have their own ABI namespace so they install side by side with the stock Ubuntu kernels (each kernel has a separate directory under /lib/modules/VERSION for example). This means that you can keep several mainline and Ubuntu stock kernels installed at the same time and select the one you need from the GRUB boot menu.

If you would like to uninstall an upstream kernel anyway, first use:

dpkg -l | grep "linux\-[a-z]*\-"

to find the exact name of the kernel packages you want to uninstall, and then do:

sudo apt-get remove KERNEL_PACKAGES_TO_REMOVE

Remember that several packages can belong to one kernel version: common headers, architecture specific headers and the architecture specific image.

Mainline build tool chain

These kernels are built with the tool chain (gcc etc.) from the previous LTS (Ubuntu 8.04/10.04/12.04) depending on version. Therefore, out-of-tree kernel modules built with tools from other versions likely will not work. The file BUILD in later mainline builds details what was used.

Mainline kernel mapping to Ubuntu kernel

The Ubuntu kernel is not bit-for-bit the same as the mainline. However, one may find the upstream release that the Ubuntu kernel is based on via the Ubuntu to mainline mapping table.

Does the kernel team support the mainline kernel builds?

The mainline kernels builds are produced for debugging purposes and therefore come with no support. Use them at your own risk.

Where can I get the source for these builds?

In each directory there is a COMMIT file which defines the base commit in Linus' master tree from which they were built. The patches in the same directory ????-* are applied on top of this commit to make the build tree. A mirror of Linus' tree is available from git://kernel.ubuntu.com/virgin/linux.git.

First download the COMMIT and patch files ????-* from the mainline build in question to a temporary directory:

  • git clone git://kernel.ubuntu.com/virgin/linux.git mainline
    cd mainline
    git checkout -b `cat ${MAINLINE}/COMMIT`
    git am ${MAINLINE}/????-*

Verifying the mainline build binaries

In order to allow verification that the published builds are the builds made by the mainline build system the individual files are checksummed and the results of that published as CHECKSUMS in the same directory. This file is in turn signed by the mainline builder using the GPG key below which can be obtained from the Ubuntu Keyserver:

  • pub   2048R/17C622B0 2008-05-01
          Key fingerprint = 60AA 7B6F 3043 4AE6 8E56  9963 E50C 6A09 17C6 22B0
    uid                  Kernel PPA <kernel-ppa@canonical.com>

Upstream kernels in detail

We currently build five sets of upstream kernels. All formal tags from Linus' tree and from the stable trees, plus:

  1. the daily tip of Linus' linux kernel source tree,

  2. the tip of the drm-next head of Dave Airlie's linux repository daily,

  3. the tip of the drm-intel-next head of Keith Packard's linux repository daily until 2012, after which it has been taken over by Daniel Vetter at http://cgit.freedesktop.org/drm-intel/, and in particular, the drm-intel-next branch,

  4. the tip of the master branch of the debloat-testing tree daily,
  5. tags from the combined v2.6.32.x.y tree (by StefanBader) which is v2.6.32.x with DRM from 2.6.33.y.

This makes these kernels closer to the Lucid kernels which are based on 2.6.32 kernels with DRM backported from the 2.6.33 series.

Kernel/MainlineBuilds (last edited 2020-03-26 22:30:32 by roguescholar)