Find the Real Problem Fast

Systematic approach to identifying underlying issues in processes systems and operations

KD - Kernel Debugger

Enhanced Definition

In the context of z/OS, the term "Kernel Debugger" does not refer to a single, dedicated product like it might in other operating systems. Instead, it conceptually encompasses a suite of specialized system tools and techniques used by system programmers to diagnose and resolve issues within the z/OS **kernel-like components**, such as the supervisor, system services, and core operating system functions, typically after a system abend or for proactive problem determination.

Key Characteristics

- No Single Product: Unlike other OS environments, z/OS does not have a single utility explicitly named "Kernel Debugger." Debugging the z/OS kernel involves various integrated system facilities.
- Dump Analysis Focus: A primary method involves analyzing system dumps (SVC dumps, stand-alone dumps) using the Interactive Problem Control System (IPCS) to examine control blocks, registers, and memory states at the time of an error.
- Event Trapping: Tools like SLIP (Serviceability Level Indication Processing) are used to set traps for specific events (