Sounds like a hardware failure, probably memory. cp shouldn't segfault spontaneously.
The line " FUCK : I've got signal 11" is typical for SuckIT rootkit's /sbin/init. BTW, the line should read something like "FUCK: I've got signal 11 while manipulating the kernel", which kinda shows how important it is to post correct and full errors.
Poboy, if this box is still connected to the 'net, disconnect it. From another box read the typical "help, I got hacked" posts in the Linux - Security forum about how to mop up. Else ask for the thread to be moved to that forum. Please check out the LQ FAQ: Security references
, part #1: "Compromise, breach of security, detection".