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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

understand perfetto Uninterruptible Sleep

Uninterruptible Sleep usually caused by I/O, sometime it''s caused by I/O trashing because of low memory. Only by looking your perfetto trace can figure it out.

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 "uninterruptible sl...

How can I put process into "uninterruptible sleep"?

I''m noticed that process that dumping a core is in uninterruptible sleep, so it can''t be killed with SIGKILL, but when I''m trying to emulate this behavior using pipe commands that receives coredump I can

Does read/write blocked system call put the process in TASK

The Uninterruptible state is mostly used by device drivers waiting for disk or network I/O. When the process is sleeping uninterruptibly, signals accumulated during the sleep are noticed when

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 program. See

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 potentially allow other tasks

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 put the

Why doing I/O in Linux is uninterruptible?

In short, making I/O uninterruptible is for the purpose of making the I/O task finish ASAP, without being interfered by signals. Some related knowledge that I gained from the book: The word