DEBUGMON | Debug monitor exception

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Systems & Devices

Canonical

/systems/embedded-systems/error-codes/debugmon/

Last Updated

Feb 27, 2026

Summary

A debug monitor exception occurred, typically in debug builds or when a debug event triggers an exception.

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Guides

Embedded / IoT Device Error Codes: Firmware, Connectivity, and Hardware Fault Patterns

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What This Code Means

Debug monitor exceptions are used on some Cortex‑M systems for debugging features (breakpoints, watchpoints, debug events). Seeing it in production logs is uncommon and may indicate a debug feature was enabled, or a crash reporter captured an unexpected debug exception.

Where Users Usually See This Code

Development/test firmware logs
Devices with debug features enabled

Why This Code Appears

Watchpoint/breakpoint triggered
Debug exception configuration enabled inadvertently

What Typically Happens Next

Device may halt (in debug) or reset (in production watchdog scenarios)

What This Code Is Not

It is not a normal user-facing device error
It is not a network service error

Troubleshooting Checklist

□ Confirm whether the firmware build is a production build
□ Review debug configuration and exception handlers

Notes And Edge Cases

Some crash loggers report the exception name even when the original trigger was elsewhere; correlate with full logs.

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