Problem - Kernel died before reaching cold state

Dear All,

    I am running SAPDB Version 7.3.0.21 in Redhat Linux V7.1 , and for all
these days I did'nt get any problem
    in running the database.

    Suddenly one time I got the error "-24994 , 1 , Kernel died before
reaching cold state"
    and also I found no relevant trace messages in knldiag log file.

    But when I rebooted the machine, I was able to start the same database
instance without any problem.

    Can anyone please help me in saying why this problem occurs or what
instances it might occur??

Regards
..Ganesh Gopalan