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kernel

How Secure Boot works on M1 series Macs

This article has now been extensively corrected and modified.

December 29, 2021 Macs, Technology

Memory leaks

What’s the difference between an app and kernel memory leak? How would you notice one, and how to investigate it, and (sometimes) work around the problem.

November 5, 2021 Macs, Technology

What happens when an M1 Mac starts up?

When does an M1 Mac validate its Sealed System Volume? Who designed its display interface? How soon does Find My Mac launch? So many answers found in the log.

December 9, 2020 Macs, Technology

Last Week on My Mac: Apple leak

The combination of a new kernel built just 10 days earlier with a set of new graphics drivers sufficed to bring many Macs to their knees.

August 16, 2020 Macs, Technology

The life cycle of a kernel panic

Catalina 10.15.6 update included a bonus: a large memory leak which led to kernel panics. This is the story of its patching.

August 14, 2020 Macs, Technology

How a kernel zone memory leak can panic macOS

When a kernel extension wants some memory, it calls for an allocation from a Mach zone. This explains how a memory leak in those zones can result in a kernel panic.

August 12, 2020 Macs, Technology

Reading a Panic Log in Catalina

Your Mac starts up after kernel panic, and shows mystifying details about that panic. Here’s how to get the most out of that information.

August 11, 2020 Macs, Technology

Understanding ‘crashes’ and kernel panics

What’s the difference between a crash and a panic? How can you tell what’s likely to have caused a panic?

August 10, 2020 Macs, Technology

Catalina 10.15.6 is prone to kernel panics from a memory leak

There have been recent reports that the macOS Catalina 10.15.6 update can result in kernel panics. This appears […]

August 6, 2020 Macs, Technology

Why is kernel_task eating my CPU?

Your Mac goes all sluggish, you open Activity Monitor, and there at the top of the CPU list is kernel_task, taking 100% or more. Why?

April 25, 2020 Macs, Technology

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