mmap-vma-diagnosis

Diagnoses mmap and VMA failures by analyzing system parameters and /proc filesystem statistics.

3|2|Updated Apr 24, 2026
One-click install
npx skills add https://github.com/openeuler-mirror/witty-diagnosis-agent --skill mmap-vma-diagnosis
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: mmap-vma-diagnosis
Source: https://github.com/openeuler-mirror/witty-diagnosis-agent/tree/main/test/mmap-vma-diagnosis
Command: npx skills add https://github.com/openeuler-mirror/witty-diagnosis-agent --skill mmap-vma-diagnosis

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides a systematic, automated approach to diagnosing complex memory mapping (mmap) and Virtual Memory Area (VMA) failures, such as ENOMEM, SIGBUS, and mlock limits, which are often difficult to debug in production environments.

Core Features & Use Cases

  • Automated Scenario Identification: Automatically maps user descriptions to specific failure modes like vm.max_map_count exhaustion or file truncation.
  • Hypothesis-Driven Diagnosis: Executes specialized diagnostic scripts to verify root causes for memory locking, shared memory, and address space fragmentation.
  • Use Case: When an Elasticsearch instance crashes with an ENOMEM error, this Skill identifies if the issue is due to vm.max_map_count exhaustion and provides the exact configuration change needed to resolve it.

Quick Start

Use the mmap-vma-diagnosis skill to analyze the memory mapping failure for the process named elasticsearch that occurred around 14:00 today.

Frequently Asked Questions about mmap-vma-diagnosis

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I diagnose Linux mmap and VMA failures causing ENOMEM errors?

Diagnosing Linux mmap and VMA failures involves analyzing process VMA statistics and system parameters to correlate kernel logs with memory state, identifying root causes like vm.max_map_count exhaustion to provide exact configuration fixes.

Why does my containerized application crash with a SIGBUS error during memory mapping?

A containerized application crashes with a SIGBUS error during memory mapping due to file truncation, which this Skill diagnoses by correlating kernel logs with process memory state to pinpoint the exact failure mode.

Can I troubleshoot mlock limit errors in high-performance applications using automated diagnosis?

Yes, you can troubleshoot mlock limit errors in high-performance applications using automated diagnosis, which executes specialized diagnostic scripts to verify root causes for memory locking failures within your environment.

What is the best way to identify vm.max_map_count exhaustion in Elasticsearch?

The best way to identify vm.max_map_count exhaustion in Elasticsearch is through hypothesis-driven diagnosis, which maps the ENOMEM crash description to the specific failure mode and verifies it against process VMA statistics.

Does diagnosing Virtual Memory Area faults require access to the /proc filesystem?

Yes, diagnosing Virtual Memory Area faults requires access to the /proc filesystem and system diagnostic tools to effectively correlate kernel logs with process memory state and identify address space fragmentation.

When should I use an automated diagnostic tool for shared memory and address space fragmentation?

You should use an automated diagnostic tool for shared memory and address space fragmentation when complex mmap failures occur in production environments, enabling hypothesis-driven verification of root causes without manual log parsing.