Can't kill process, not in zombie or uninterruptable sleep

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http://unix.stackexchange.com – I can't figure out how to kill this process. I ran du, but it took too long so I tried to kill it. It didn't die. I've tried SIGKILL, SIGSTOP, SIGINT, etc, with no effect (can't kill it, can't stop it). It is not in D or Z state, as you can see in the following top output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 12047 alex 39 19 5656 496 408 R 99.6 0.0 209:10.04 du --max-depth=1 -h Since it won't stop, I can't a (HowTos)