Really killing a process in Windows

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“End Process” on the Processes-Tab calls TerminateProcess which is the most ultimate way Windows knows to kill a process.

If it doesn’t go away, it’s currently locked waiting on some kernel resource (probably a buggy driver) and there is nothing (short of a reboot) you could do to make the process go away.

Have a look at this blog-entry from wayback when: http://blogs.technet.com/markrussinovich/archive/2005/08/17/unkillable-processes.aspx

Unix based systems like Linux also have that problem where processes could survive a kill -9 if they are in what’s known as “Uninterruptible sleep” (shown by top and ps as state D) at which point the processes sleep so well that they can’t process incoming signals (which is what kill does – sending signals).

Normally, Uninterruptible sleep should not last long, but as under Windows, broken drivers or broken userpace programs (vfork without exec) can end up sleeping in D forever.

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