Uninterruptible Power Supply Agent in Somaliland

linux

An uninterruptible process is a process which happens to be in a system call (kernel function) that cannot be interrupted by a signal. To understand what that means, you

2025 Mar 05

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linux

I understand these are uninterruptible sleep states often related to waiting for data from hardware such as a hard disk. This is a production server so rebooting is a very last

2025 Feb 09

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how to find out what it is waiting for

When looking at the process with "ps ax" the stat column is "Dl" which means "uninterruptible sleep (usually IO)". Is it possible to find out more details on what the process is

2024 Jun 03

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How to create an uninterruptible sleep in C?

Generally speaking, uninterruptible sleep states are considered undesirable. Under normal circumstances, they cannot be triggered by user applications except by accident (e.g,

2026 Jan 10

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How to stop ''uninterruptible'' process on Linux?

I have a VirtualBox process hanging around which I tried to kill (KILL/ABORT) but without success. The parent pid is 1 (init). top shows the process as D which is documented as

2026 Jan 21

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linux

For Linux "defunct" and "zombie" processes are the same. From man ps: Processes marked <defunct> are dead processes (so-called "zombies") that remain because

2024 Nov 18

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Linux Process States

A process performing I/O will be put in D state (uninterruptable sleep), which frees the CPU until there is a hardware interrupt which tells the CPU to return to executing the

2025 Jan 06

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Why there is a state called `TASK_UNINTERRUPTIBLE` in Linux

As you could read from that answer, setting the current process state to TASK_UNINTERRUPTIBLE is needed for make schedule() call, performed by that thread, to

2026 Jan 21

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Do we need to call set_current_state (TASK

Yes, you must call set_current_state() before calling schedule(), because otherwise the scheduler will not remove the task from the run queue (if you just want to

2025 Apr 19

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