The Notification That Ate My MacBook: A Debugging Story

Short summary

A debugging narrative tracing a MacBook overheating issue to macOS's usernoted daemon pinned at 99% CPU. The root cause was a corrupted repeating notification with an unresolvable week-of-year calendar rule. Standard fixes like killing the process and removing calendar data all failed before a sample stack trace revealed the infinite loop in Foundation's calendar engine.

• •usernoted daemon consumed 99% CPU due to a corrupted notification date rule
• •Standard fixes (killall, calendar removal) all failed to resolve the spin
• •sample tool revealed infinite loop in Calendar week-of-year computation

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