How do I kill a forkbomb process?

Question

I started forkbomb from normal user account say - "user1" I'm running a script which says

killall -u user1

But it didn't fix the situation.

Answer 1

reboot the computer

if you can't, you could try:

killall -STOP -u user1
killall -KILL -u user1

If by "permanent solution", you mean preventing this happening again, well you can't really, but you can simply reduce the ulimit for the problem users and ignore them.

Answer 2

while true; do killall -u user1; done