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 attach to it with gdb either.

Does anyone have any ideas how to kill this without rebooting?

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    Give us the output of ps -l -p 12047 - specifically the value of the WCHAN column. My guess is the process is in "disk wait", which makes it unkillable. – Bruce Ediger Jul 14 '12 at 4:02
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    I've gone and rebooted, but I used a similar command before I did so, and the WCHAN column only had -. Disk wait would put it in D state, and not result in high CPU, wouldn't it? – lxop Jul 14 '12 at 5:03
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    Is this by any chance done on a sshfs mount? – Thor Jul 14 '12 at 11:28
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    @lxop can you reproduce this? – xenoterracide Jul 20 '12 at 13:18
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    @lxop I'm calling too localized, hit up a mod if you can reproduce and need this reopened. – xenoterracide Jul 21 '12 at 11:42

Try using killall -9 (name of process)

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    Signal 9 is SIGKILL, which he said he already tried – Michael Mrozek Jul 20 '12 at 14:01

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