From Fedora Project Wiki
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To be successful in debugging you will need setup and remotely connect to the serial console. | To be successful in debugging you will need setup and remotely connect to the serial console. | ||
Add the following lines to you /etc/grub.conf | Add the following lines to you '''/etc/grub.conf''' | ||
{{admon/note|The examples in this uses the first serial port, giving <serial_port> the value 0, which in turn gives kernel parameter console=ttyS0}} | {{admon/note|The examples in this uses the first serial port, giving <serial_port> the value 0, which in turn gives kernel parameter console=ttyS0}} | ||
| Line 37: | Line 37: | ||
<pre>console=tty0 console=ttyS0,9600</pre> | <pre>console=tty0 console=ttyS0,9600</pre> | ||
So /etc/grub.conf looks something like this now | So '''/etc/grub.conf''' looks something like this now | ||
<pre>default=0 | <pre>default=0 | ||
Revision as of 16:50, 2 July 2009
Debugging
All bug reports
In all cases, the following should be mentioned and attached to your bug report:
The exact kernel command line used!
An copy of /etc/fstab
cp /etc/fstab ~USER/Desktop/fstab.txt
The output of dmsetup ls --tree.
dmsetup ls --tree > ~USER/Desktop/dmsetup.txt
If using an raid device the output of cat /proc/mdstat.
cat /proc/mdstat > ~USER/Desktop/mdstat.txt
Preparing your system for debugging
To be successful in debugging you will need setup and remotely connect to the serial console.
Add the following lines to you /etc/grub.conf
Beneath timeout=5 put..
serial --unit=0 --speed=9600
terminal --timeout=5 serial console
At the end of the kernel line put..
console=tty0 console=ttyS0,9600
So /etc/grub.conf looks something like this now
default=0
timeout=5
serial --unit=0 --speed=9600
terminal --timeout=5 serial console
title Fedora (2.6.29.5-191.fc11.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.29.5-191.fc11.x86_64 ro root=/dev/mapper/vg_uc1-lv_root console=tty0 console=ttyS0,9600
initrd /initrd-2.6.29.5-191.fc11.x86_64.img
Redirect all non-interactive stuff output to /dev/kmsg that
exec >/dev/kmsg 2>&1 </dev/console
Create the image debug enable.
-a debug
Boot with debug enable.
rdinitdebug rdnetdebug
Dracut debugging kernel command parameters
rdinitdebug
set -x for the dracut shell
rdbreak=[pre-udev|pre-mount|mount|pre-pivot|]
drop the shell on defined breakpoint
rdudevinfo
set udev to loglevel info
dudevdebug
set udev to loglevel debug
rdnetdebug
debug network scripts in dracut