Skip to content

Commit

Permalink
---
Browse files Browse the repository at this point in the history 
yaml
---
r: 22975
b: refs/heads/master
c: 2e6e33b
h: refs/heads/master
i:
  22973: 25915a5
  22971: 9c2095d
  22967: 5afd10e
  22959: 4699f99
  22943: b99c480
  22911: 9e447b0
v: v3
  • Loading branch information
Linus Torvalds committed Mar 23, 2006
1 parent 162173f commit ba9f6bd
Show file tree
Hide file tree
Showing 1,962 changed files with 124,788 additions and 94,302 deletions.
2 changes: 1 addition & 1 deletion [refs]
View file
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: b88a0b1d5560cf1959c1565617e460a45c688a08
refs/heads/master: 2e6e33bab6e1996a5dec9108fb467b52b841e7a8
3 changes: 3 additions & 0 deletions trunk/.gitignore
View file
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#
# Top-level generic files
#
tags
vmlinux*
System.map
Module.symvers
Expand All @@ -30,3 +31,5 @@ include/linux/autoconf.h
include/linux/compile.h
include/linux/version.h

# stgit generated dirs
patches-*
3 changes: 2 additions & 1 deletion trunk/CREDITS
View file
Original file line number Diff line number Diff line change
Expand Up @@ -120,7 +120,6 @@ D: Author of lil (Linux Interrupt Latency benchmark)
D: Fixed the shm swap deallocation at swapoff time (try_to_unuse message)
D: VM hacker
D: Various other kernel hacks
S: Via Cicalini 26
S: Imola 40026
S: Italy

Expand Down Expand Up @@ -2814,6 +2813,8 @@ E: luca.risolia@studio.unibo.it
P: 1024D/FCE635A4 88E8 F32F 7244 68BA 3958 5D40 99DA 5D2A FCE6 35A4
D: V4L driver for W996[87]CF JPEG USB Dual Mode Camera Chips
D: V4L2 driver for SN9C10x PC Camera Controllers
D: V4L2 driver for ET61X151 and ET61X251 PC Camera Controllers
D: V4L2 driver for ZC0301 Image Processor and Control Chip
S: Via Liberta' 41/A
S: Osio Sotto, 24046, Bergamo
S: Italy
Expand Down
113 changes: 113 additions & 0 deletions trunk/Documentation/BUG-HUNTING
View file
Original file line number Diff line number Diff line change
@@ -1,3 +1,56 @@
Table of contents
=================

Last updated: 20 December 2005

Contents
========

- Introduction
- Devices not appearing
- Finding patch that caused a bug
-- Finding using git-bisect
-- Finding it the old way
- Fixing the bug

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 REPORTING-BUGS.

Devices not appearing
=====================

Often this is caused by udev. Check that first before blaming it on the
kernel.

Finding patch that caused a bug
===============================



Finding using git-bisect
------------------------

Using the provided tools with git makes finding bugs easy provided the bug is
reproducible.

Steps to do it:
- start using git for the kernel source
- read the man page for git-bisect
- have fun

Finding it the old way
----------------------

[Sat Mar 2 10:32:33 PST 1996 KERNEL_BUG-HOWTO lm@sgi.com (Larry McVoy)]

This is how to track down a bug if you know nothing about kernel hacking.
Expand Down Expand Up @@ -90,3 +143,63 @@ it does work and it lets non-hackers help fix bugs. And it is cool
because Linux snapshots will let you do this - something that you can't
do with vendor supplied releases.

Fixing the bug
==============

Nobody is going to tell you how to fix bugs. Seriously. You need to work it
out. But below are some hints on how to use the tools.

To debug a kernel, use objdump and look for the hex offset from the crash
output to find the valid line of code/assembler. Without debug symbols, you
will see the assembler code for the routine shown, but if your kernel has
debug symbols the C code will also be available. (Debug symbols can be enabled
in the kernel hacking menu of the menu configuration.) For example:

objdump -r -S -l --disassemble net/dccp/ipv4.o

NB.: you need to be at the top level of the kernel tree for this to pick up
your C files.

If you don't have access to the code you can also debug on some crash dumps
e.g. crash dump output as shown by Dave Miller.

> EIP is at ip_queue_xmit+0x14/0x4c0
> ...
> Code: 44 24 04 e8 6f 05 00 00 e9 e8 fe ff ff 8d 76 00 8d bc 27 00 00
> 00 00 55 57 56 53 81 ec bc 00 00 00 8b ac 24 d0 00 00 00 8b 5d 08
> <8b> 83 3c 01 00 00 89 44 24 14 8b 45 28 85 c0 89 44 24 18 0f 85
>
> Put the bytes into a "foo.s" file like this:
>
> .text
> .globl foo
> foo:
> .byte .... /* bytes from Code: part of OOPS dump */
>
> Compile it with "gcc -c -o foo.o foo.s" then look at the output of
> "objdump --disassemble foo.o".
>
> Output:
>
> ip_queue_xmit:
> push %ebp
> push %edi
> push %esi
> push %ebx
> sub $0xbc, %esp
> mov 0xd0(%esp), %ebp ! %ebp = arg0 (skb)
> mov 0x8(%ebp), %ebx ! %ebx = skb->sk
> mov 0x13c(%ebx), %eax ! %eax = inet_sk(sk)->opt

Another very useful option of the Kernel Hacking section in menuconfig is
Debug memory allocations. This will help you see whether data has been
initialised and not set before use etc. To see the values that get assigned
with this look at mm/slab.c and search for POISON_INUSE. When using this an
Oops will often show the poisoned data instead of zero which is the default.

Once you have worked out a fix please submit it upstream. After all open
source is about sharing what you do and don't you want to be recognised for
your genius?

Please do read Documentation/SubmittingPatches though to help your code get
accepted.
18 changes: 0 additions & 18 deletions trunk/Documentation/Changes
View file
Original file line number Diff line number Diff line change
Expand Up @@ -15,24 +15,6 @@ and therefore owes credit to the same people as that file (Jared Mauch,
Axel Boldt, Alessandro Sigala, and countless other users all over the
'net).

The latest revision of this document, in various formats, can always
be found at <http://cyberbuzz.gatech.edu/kaboom/linux/Changes-2.4/>.

Feel free to translate this document. If you do so, please send me a
URL to your translation for inclusion in future revisions of this
document.

Smotrite file <http://oblom.rnc.ru/linux/kernel/Changes.ru>, yavlyaushisya
russkim perevodom dannogo documenta.

Visite <http://www2.adi.uam.es/~ender/tecnico/> para obtener la traducci�n
al espa�ol de este documento en varios formatos.

Eine deutsche Version dieser Datei finden Sie unter
<http://www.stefan-winter.de/Changes-2.4.0.txt>.

Chris Ricker (kaboom@gatech.edu or chris.ricker@genetics.utah.edu).

Current Minimal Requirements
============================

Expand Down
2 changes: 1 addition & 1 deletion trunk/Documentation/DocBook/Makefile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
procfs-guide.xml writing_usb_driver.xml \
sis900.xml kernel-api.xml journal-api.xml lsm.xml usb.xml \
kernel-api.xml journal-api.xml lsm.xml usb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml

###
Expand Down
Loading

0 comments on commit ba9f6bd

Please sign in to comment.