Tagged articles

D state

3 articles · Page 1 of 1

May 23, 2026 · Operations

Why D and Z Processes Stall Your CPU: Linux Performance Tuning Guide

The article explains the low‑level reasons why uninterruptible (D) and zombie (Z) processes inflate Linux load average, shows how to identify them with ps, wchan and /proc tools, and provides step‑by‑step diagnostics, handling strategies, kernel and I/O scheduler tweaks, and preventive measures to keep the system responsive.

D stateI/O debuggingLinux

0 likes · 15 min read

Why D and Z Processes Stall Your CPU: Linux Performance Tuning Guide

Refining Core Development Skills

Dec 23, 2024 · Operations

Understanding the Linux “D” (Uninterruptible Sleep) Process State

The article explains the meaning of a process being in the “D” state on Linux, describing it as an uninterruptible sleep caused by blocked I/O, how to identify it with tools like ps or top, why it cannot be killed, and common troubleshooting steps.

D stateLinuxprocess-state

0 likes · 5 min read

Understanding the Linux “D” (Uninterruptible Sleep) Process State

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Sep 20, 2016 · Fundamentals

Understanding Linux’s Hung Task Mechanism: Detecting D‑State Processes

The article explains how the Linux kernel identifies processes stuck in the uninterruptible D state, describes the hung‑task detection code, shows the watchdog thread and related functions, and provides a Raspberry Pi example that triggers and logs a hung‑task warning.

D stateHung TaskLinux

0 likes · 14 min read

Understanding Linux’s Hung Task Mechanism: Detecting D‑State Processes