Questions tagged [kernel]

The core part of an operating system, responsible for managing resource allocation.

29 questions with no upvoted or accepted answers
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Does macOS still use Yarrow as it's cryptographically secure pseudorandom number generator?

I'm trying to understand if the XNU underpinnings of macOS (BSD) still use the Yarrow cryptographically secure pseudorandom number generator? I have looked through the source and it seems as if they ...
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Is there a way to generate a kernel core dump file after a kernel panic occurred on OSX?

I need to debug a kernel panic and the current information in the kernel panic log file is insufficient. The only information available on that matter is in the following link: https://developer....
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Fake ethernet interfaces (feth / if_fake)? Anyone ever seen this?

I've been digging into Darwin source to try to find some way to create virtual Ethernet interfaces on Mac/Darwin without adding a kernel extension like tuntaposx. In doing so I've found something ...
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kernel_task writes huge amounts of data to disk (> 1TB) - how to diagnose?

My MacBook (2016 with TouchBar) running macOS 10.13 has a 512GB SSD. Looking at the activity monitor after a couple of weeks of uptime (most of it spent in standby), kernel_task shows 1.43TB (!) of ...
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How to isolate sys / kernel vars that may cause odd problems and “no mountable file systems” on a high memory system?

How would one ascertain what the bottleneck is on a system with high memory (128 GB RAM) and starts getting peculiar errors when there's only 10-20 GB remaining free? I'm getting various odd issues ...
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That Kernel Process Bloat

This is probably a question best suited for Apple Support Forums, but after asking variants of this question there to no avail, I will try here instead. I have a 2012/2013 2.3 GHz i7 Mac Mini w/ 16 ...
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346 views

Kernel Extension Not Loaded

I built a self-made kernel extension (named KAuthTest.kext) and would like to test it out. So in a VM running macOS 10.12.3, I did the followings: disable SIP by running csrutil disable in recovery ...
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1k views

kernel_task high CPU consumption and slow Mac

It's not a new problem, I'm facing it for sometime now. My MacBook runs fine all the time but this kernel_task issue occurs whenever it awakes from sleep. No issues with DisplaySleep. I can't put the ...
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984 views

How to sniff/capture/trace USB data in recent macOS?

The old 'USB Prober.app' does not work after Mavericks. Is there way to capture USB data in Sierra? To be specific, I got a LG UltraFine 4K monitor, whose brightness can only be controlled from macOS ...
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77 views

Why after installing MacPorts the kernel_task RAM size raised x1.5?

I noticed that before installing MacPorts the kernel_task RAM usage was about 200-300 Mb. After installing that the process is using 482.5 Mb real RAM. What are the components (maybe .kexts, which ...
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184 views

What is kernel_task writing and reading?

After moving from High-Sierra to Mojave I noticed my Mac (23", fusion-drive 3.4GHz) has become much slower. In particular, I noticed that just after the startup I have a significant amount of disk ...
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Dtrace working but no kernel data can be output?

I have for a long time run as sip -without dtrace to use dtrace and this is fine but a few apps I want to read data from seen to run in kernel mode (Little Snitch has several components for instance). ...
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267 views

Kernel Panic Once A Week

I get the exact same kernel panic on my iMac 5K Late 2014 Edition pretty much once a week. Does anyone know what is causing it? Anonymous UUID: F36129E9-69E1-B321-06F7-0519199C40B7 Tue Mar 6 ...
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820 views

kernel_task CPU usage with SIP on a MacBookPro8,2 with no battery

Is there any evidence or technical documentation to support the notion that System Integrity Protection can cause excessive use of the CPU by kernel_task in some situation? Background No battery. ...
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Kernel Task is taking up 1.12 GB in activity monitor

I have an issue where my kernel task is taking over a GB of memory on my activity monitor. My fan seems to be going pretty crazy and is loud. Any ideas?
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443 views

Severe performance issues with my Macbook Pro Retina 13 - mid 2014

A few weeks ago I bought a used Macbook Pro Retina and I've been having severe issues with it since. The first thing I did when I bought it was to upgrade from whatever version of OSX it was using to ...
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Cannot load the Built-in keyboard kext on Macbook pro

I needed to disable my internal keyboard for a while. What I did was try this: sudo kextunload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyboard.kext/ Though that ...
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555 views

OSX Yosemite Kernel Panic

Okay, so I use Teamviewer to remote into this computer while at work, that might explain why the BSD process name corresponding to current thread is TeamViewer_Deskt, not sure. I was on today and it ...
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Safari keeps Crashing due to External Modification Warning

In the last 24-hours my Safari has gone haywire. I cannot access the program to even get into my Safari Preferences without getting the following message! Any idea how to cure this? Process: ...
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updating two identical machines results in two different Darwin kernel versions reported

I have two identical Mac Minis and I updated each with all available updates. This caused both machines to go from OS X 10.9.2 to OS X 10.9.4. However, uname -a reports different kernel versions for ...
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750 views

IOStorageFamily / IOSCSIArchitectureModelFamily kext errors on Mavericks

Occasionally when I start up my Mid-2012 Macbook Pro, I see the following error messages a few moments after logging in: This happens about every second or third login. After seeing these error ...
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724 views

rEFInd Linux Kernel Boot Options

When booting opensuse via rEFInd, the kernel options are wrong (the root device name is incorrect). Where do the kernel arguments that rEFInd is using come from, and how do I modify them? The line I'...
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383 views

Custom XNU Kernel

I have already submitted this question on StackOverflow but I figured that this may be a more appropriate location. I'm building a custom kernel for Mac OS (Mountain Lion, Darwin 2050.22.13). I can ...
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1answer
3k views

Free up unused memory from kernel_task

I am a web developer, and sometimes I encounter software bugs that has runaway threads or used up available memory in a browser process. Terminating the offending Chrome process will free up the ...
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Generating NMI (non-maskable interrupt) in Mac VM running on VMware Fusion

I'm trying to (kernel-)debug my Mac 10.14.5 VM running on VMWare Fusion (v11.0.2) on my Mac 10.13.6 host. I'm following documentation/blogs in [1], [2]. I am trying to generate an NMI (non-maskable ...
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iMac: How to disable display via terminal. Kernel_task issue CPU 70%

I have a Late 2015 iMac running macOS Mojave. I am looking to disable the main display and use an external display as the primary/default display. I am looking for a command-line that can do that. I ...
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164 views

Device Console error: kernel compat_ifmu_ulist error 14

After looking through my Console log I noticed a strange error that seems to show up around 10 times a second or so. The error is coming from the kernel and shows up as one of the following 5 or so ...
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240 views

Kernel panics due to Parallels Desktop or Apple's own problem with graphics controller?

Twice this week my MacBook Pro Retina has suffered kernel panics for the first time after years of faithful service. This coincides with me upgrading and beginning to use Parallels 14.0.1, so I ...
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447 views

Yet another kernel_task high CPU usage question

I have a headless Quad-Core Mac mini living in the storage cupboard and in the last week or so which possibly coincides with updating to El Capitan has began having the problem, 600% usage from boot. ...