mirror of
https://github.com/torvalds/linux.git
synced 2024-12-09 12:41:33 +00:00
ca4354543a
It seems we can't have literal blocks in footnotes, which almost actually makes some sense. So just use basic ``monospace`` instead. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
77 lines
2.1 KiB
ReStructuredText
77 lines
2.1 KiB
ReStructuredText
Bisecting a bug
|
|
+++++++++++++++
|
|
|
|
Last updated: 28 October 2016
|
|
|
|
Introduction
|
|
============
|
|
|
|
Always try the latest kernel from kernel.org and build from source. If you are
|
|
not confident in doing that please report the bug to your distribution vendor
|
|
instead of to a kernel developer.
|
|
|
|
Finding bugs is not always easy. Have a go though. If you can't find it don't
|
|
give up. Report as much as you have found to the relevant maintainer. See
|
|
MAINTAINERS for who that is for the subsystem you have worked on.
|
|
|
|
Before you submit a bug report read
|
|
:ref:`Documentation/admin-guide/reporting-bugs.rst <reportingbugs>`.
|
|
|
|
Devices not appearing
|
|
=====================
|
|
|
|
Often this is caused by udev/systemd. Check that first before blaming it
|
|
on the kernel.
|
|
|
|
Finding patch that caused a bug
|
|
===============================
|
|
|
|
Using the provided tools with ``git`` makes finding bugs easy provided the bug
|
|
is reproducible.
|
|
|
|
Steps to do it:
|
|
|
|
- build the Kernel from its git source
|
|
- start bisect with [#f1]_::
|
|
|
|
$ git bisect start
|
|
|
|
- mark the broken changeset with::
|
|
|
|
$ git bisect bad [commit]
|
|
|
|
- mark a changeset where the code is known to work with::
|
|
|
|
$ git bisect good [commit]
|
|
|
|
- rebuild the Kernel and test
|
|
- interact with git bisect by using either::
|
|
|
|
$ git bisect good
|
|
|
|
or::
|
|
|
|
$ git bisect bad
|
|
|
|
depending if the bug happened on the changeset you're testing
|
|
- After some interactions, git bisect will give you the changeset that
|
|
likely caused the bug.
|
|
|
|
- For example, if you know that the current version is bad, and version
|
|
4.8 is good, you could do::
|
|
|
|
$ git bisect start
|
|
$ git bisect bad # Current version is bad
|
|
$ git bisect good v4.8
|
|
|
|
|
|
.. [#f1] You can, optionally, provide both good and bad arguments at git
|
|
start with ``git bisect start [BAD] [GOOD]``
|
|
|
|
For further references, please read:
|
|
|
|
- The man page for ``git-bisect``
|
|
- `Fighting regressions with git bisect <https://www.kernel.org/pub/software/scm/git/docs/git-bisect-lk2009.html>`_
|
|
- `Fully automated bisecting with "git bisect run" <https://lwn.net/Articles/317154>`_
|
|
- `Using Git bisect to figure out when brokenness was introduced <http://webchick.net/node/99>`_
|