SUB:HELP FOR LOG/MESSAGE

[kanhu rauta]

Dear sir/madam,
SORRY FOR MINE POOR ENGLISH.
>i am doing some kernel code modification as for mine requirement, for mine debugging perpose i used the printk() statement in the codes.but some times mine system hangs,at that time i unable to get the print stastments.in the /var/log/messages.so i did not getting whats the problem
 
> weither any other place or techineque to get the log/messages at the time system hangs.
any ideia regarding this is welcome
With Regards
kanhu