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I have been recently asked this question during interview, "What is D state and when does process goes in D state. I explained what D state is and then gave the answer that when the process is performing I/O operation that is when its in D state.

The interviewer (its on of the high tech companies in the world) said that there is other reason when process goes in D state, what reason could that be, but I couldn't think of anything else.

This answer When a process will go to 'D' state? also explains its usually I/O which sends a process in D state, which I understand clearly.

Can someone please tell me what are some other reasons for process being in D state except performing I/O?

MaverickD
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1 Answers1

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A process can go into uninterruptible sleep when performing synchronization tasks, such as trying to obtain a mutex lock.

guzzijason
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