From Fedora Project Wiki
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
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
