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Re: Can timeout prevent process being stuck in D state

From: Bernhard Voelker
Subject: Re: Can timeout prevent process being stuck in D state
Date: Mon, 21 Jan 2019 19:30:34 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/21/19 10:17 AM, Marc Roos wrote:
> I have had a process stuck in D+ state, and need to run it still a few 
> times. If I use timeout, will it prevent this process being stuck in D+ 
> state until a reboot?

Basically, timeout is sending a signal to the process it has started
after the TIMEOUT time has passed.  The default signal is SIGTERM,
but you can pass any other signal number instead.

The point is: if your process doesn't react on receiving a SIGNAL with
a regular 'kill -SIGNAL PID', then there's nothing more timeout could do
about it.

Regarding state 'D+':

$ man ps | grep ' D '
      D    uninterruptible sleep (usually IO)

So no, that process seems to be stuck in an IO operation.
You may find out with e.g. 'strace -vp PID' and 'lsof -p PID'
what that process is doing.

More on 'D':
- use your search engine of choice.

Have a nice day,

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