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docs: verify/bisect: explain testing reverts, patches and newer code
Rename 'Supplementary tasks' to 'Complementary tasks' while introducing a section 'Optional tasks: test reverts, patches, or later versions': the latter is something readers occasionally will have to do after reporting a bug and thus is best covered here. Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/dacf26a4c48e9e8f04ecbc77e0a74c9b2a6a1103.1712647788.git.linux@leemhuis.info
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Thorsten Leemhuis
Jonathan Corbet
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453de3207f
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@ -160,7 +160,7 @@ will be considered the 'good' release and used to prepare the .config file.
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this step (e.g. build, install, boot, and test a kernel to then tell Git
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the outcome). Do so again and again until Git shows which commit broke
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things. If you run short of disk space during this process, check the
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section 'Supplementary tasks: cleanup during and after the process'
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section 'Complementary tasks: cleanup during and after the process'
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below.
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d) Once your finished the bisection, put a few things away::
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@ -182,7 +182,7 @@ will be considered the 'good' release and used to prepare the .config file.
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kernel; just this time skip the first command copying the base .config file
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over, as that already has been taken care off.
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* **Supplementary tasks**: cleanup during and after the process.
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* **Complementary tasks**: cleanup during and after the process.
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a) To avoid running out of disk space during a bisection, you might need to
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remove some kernels you built earlier. You most likely want to keep those
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@ -205,6 +205,18 @@ will be considered the 'good' release and used to prepare the .config file.
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the kernels you built earlier and later you might want to keep around for
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a week or two.
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* **Optional task**: test a debug patch or a proposed fix later::
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git fetch mainline
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git switch --discard-changes --detach mainline/master
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git apply /tmp/foobars-proposed-fix-v1.patch
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cp ~/kernel-config-working .config
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./scripts/config --set-str CONFIG_LOCALVERSION '-local-foobars-fix-v1'
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Build, install, and boot a kernel as described in *segment 1, section b* --
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but this time omit the first command copying the build configuration over,
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as that has been taken care of already.
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.. _introguide_bissbs:
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Step-by-step guide on how to verify bugs and bisect regressions
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@ -232,7 +244,9 @@ developers are obliged to act upon.
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:ref:`Segment 3: perform a bisection and validate the result <introbisect_bissbs>`.
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:ref:`Supplementary tasks: cleanup during and after following this guide <introclosure_bissbs>`.
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:ref:`Complementary tasks: cleanup during and after following this guide <introclosure_bissbs>`.
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:ref:`Optional tasks: test reverts, patches, or later versions <introoptional_bissbs>`.
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The steps in each segment illustrate the important aspects of the process, while
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a comprehensive reference section holds additional details for almost all of the
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@ -669,7 +683,7 @@ be a waste of time. [:ref:`details <introlatestcheck_bisref>`]
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Do you follow this guide to verify if a problem is present in the code
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currently supported by Linux kernel developers? Then you are done at this
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point. If you later want to remove the kernel you just built, check out
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:ref:`Supplementary tasks: cleanup during and after following this guide <introclosure_bissbs>`.
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:ref:`Complementary tasks: cleanup during and after following this guide <introclosure_bissbs>`.
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In case you face a regression, move on and execute at least the next segment
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as well.
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@ -888,7 +902,7 @@ each kernel on commodity x86 machines.
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.. _introclosure_bissbs:
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Supplementary tasks: cleanup during and after the bisection
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Complementary tasks: cleanup during and after the bisection
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-----------------------------------------------------------
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During and after following this guide you might want or need to remove some of
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@ -950,6 +964,81 @@ space might run out.
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[:ref:`details <finishingtouch_bisref>`]
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.. _introoptional_bissbs:
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Optional: test reverts, patches, or later versions
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--------------------------------------------------
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While or after reporting a bug, you might want or potentially will be asked to
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test reverts, debug patches, proposed fixes, or other versions. In that case
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follow these instructions.
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* Update your Git clone and check out the latest code.
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* In case you want to test mainline, fetch its latest changes before checking
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its code out::
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git fetch mainline
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git switch --discard-changes --detach mainline/master
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* In case you want to test a stable or longterm kernel, first add the branch
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holding the series you are interested in (6.2 in the example), unless you
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already did so earlier::
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git remote set-branches --add stable linux-6.2.y
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Then fetch the latest changes and check out the latest version from the
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series::
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git fetch stable
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git switch --discard-changes --detach stable/linux-6.2.y
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* Copy your kernel build configuration over::
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cp ~/kernel-config-working .config
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* Your next step depends on what you want to do:
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* In case you just want to test the latest codebase, head to the next step,
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you are already all set.
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* In case you want to test if a revert fixes an issue, revert one or multiple
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changes by specifying their commit ids::
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git revert --no-edit cafec0cacaca0
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Now give that kernel a special tag to facilitates its identification and
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prevent accidentally overwriting another kernel::
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./scripts/config --set-str CONFIG_LOCALVERSION '-local-cafec0cacaca0-reverted'
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* In case you want to test a patch, store the patch in a file like
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'/tmp/foobars-proposed-fix-v1.patch' and apply it like this::
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git apply /tmp/foobars-proposed-fix-v1.patch
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In case of multiple patches, repeat this step with the others.
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Now give that kernel a special tag to facilitates its identification and
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prevent accidentally overwriting another kernel::
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./scripts/config --set-str CONFIG_LOCALVERSION '-local-foobars-fix-v1'
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* Build a kernel using the familiar commands, just without copying the kernel
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build configuration over, as that has been taken care of already::
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make olddefconfig &&
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make -j $(nproc --all)
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# * Check if the free space suffices holding another kernel:
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df -h /boot/ /lib/modules/
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sudo make modules_install
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command -v installkernel && sudo make install
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make -s kernelrelease | tee -a ~/kernels-built
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reboot
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* Now verify you booted the newly built kernel and check it.
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[:ref:`details <introoptional_bisref>`]
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.. _submit_improvements:
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@ -1986,20 +2075,33 @@ build artifacts and the Linux sources, but will leave the Git repository
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(~/linux/.git/) behind -- a simple ``git reset --hard`` thus will bring the
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sources back.
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Removing the repository as well would likely be unwise at this point: there is a
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decent chance developers will ask you to build another kernel to perform
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additional tests. This is often required to debug an issue or check proposed
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fixes. Before doing so you want to run the ``git fetch mainline`` command again
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followed by ``git checkout mainline/master`` to bring your clone up to date and
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checkout the latest codebase. Then apply the patch using ``git apply
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<filename>`` or ``git am <filename>`` and build yet another kernel using the
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familiar commands.
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Removing the repository as well would likely be unwise at this point: there
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is a decent chance developers will ask you to build another kernel to
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perform additional tests -- like testing a debug patch or a proposed fix.
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Details on how to perform those can be found in the section :ref:`Optional
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tasks: test reverts, patches, or later versions <introoptional_bissbs>`.
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Additional tests are also the reason why you want to keep the
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~/kernel-config-working file around for a few weeks.
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[:ref:`back to step-by-step guide <finishingtouch_bissbs>`]
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.. _introoptional_bisref:
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Test reverts, patches, or later versions
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----------------------------------------
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*While or after reporting a bug, you might want or potentially will be asked
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to test reverts, patches, proposed fixes, or other versions.*
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[:ref:`... <introoptional_bissbs>`]
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All the commands used in this section should be pretty straight forward, so
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there is not much to add except one thing: when setting a kernel tag as
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instructed, ensure it is not much longer than the one used in the example, as
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problems will arise if the kernelrelease identifier exceeds 63 characters.
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[:ref:`back to step-by-step guide <introoptional_bissbs>`].
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Additional reading material
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===========================
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