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Oracle Solaris Modular Debugger Guide     Oracle Solaris 11 Express 11/10
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Document Information


1.  Modular Debugger Overview

2.  Debugger Concepts

3.  MDB Language Syntax

4.  Using MDB Commands Interactively

5.  Built-In Commands

6.  Execution Control

7.  Kernel Execution Control

8.  Kernel Debugging Modules

9.  Debugging With the Kernel Memory Allocator

Getting Started: Creating a Sample Crash Dump

Setting kmem_flags

Forcing a Crash Dump

Saving a Crash Dump

Starting MDB

Allocator Basics

Buffer States


Sleeping and Non-Sleeping Allocations

Kernel Memory Caches

Kernel Memory Caches

Detecting Memory Corruption

Freed Buffer Checking: 0xdeadbeef

Redzone: 0xfeedface

Uninitialized Data: 0xbaddcafe

Associating Panic Messages With Failures

Memory Allocation Logging

Buftag Data Integrity

The bufctl Pointer

Advanced Memory Analysis

Finding Memory Leaks

Finding References to Data

Finding Corrupt Buffers With ::kmem_verify

Allocator Logging Facility

10.  Module Programming API

A.  MDB Options

B.  Notes

C.  Transition From adb and kadb

D.  Transition From crash


Chapter 9

Debugging With the Kernel Memory Allocator

The Oracle Solaris kernel memory (kmem) allocator provides a powerful set of debugging features that can facilitate analysis of a kernel crash dump. This chapter discusses these debugging features, and the MDB dcmds and walkers designed specifically for the allocator. Bonwick (see Related Books and Papers) provides an overview of the principles of the allocator itself. Refer to the header file <sys/kmem_impl.h> for the definitions of allocator data structures. The kmem debugging features can be enabled on a production system to enhance problem analysis, or on development systems to aid in debugging kernel software and device drivers.

Note - MDB exposes kernel implementation details that are subject to change at any time. This guide reflects the Oracle Solaris kernel implementation as of the date of publication of this guide. Information provided in this guide about the kernel memory allocator might not be correct or applicable to past or future Oracle Solaris releases.