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Questions tagged [kernel]

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

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Why Mac (M1\M2) crashed while connecting to Win 7 PC via SMB

After choosing the guest option the system crashes and after the system restarts it gives the following logs to report, yes I've tried the Registered User option but that just not working. Panic(cpu 2 ...
Rehan Ali Khan's user avatar
1 vote
0 answers
32 views

kernel_task slowing down on Intel-based MacBook Pro

I have a 2020 MacBook Pro 16", the last of the Intel based Macs. Just in the last couple of weeks it has been slowing down due the kernel_task process going up to 1000% CPU usage. I have done a ...
Matt's user avatar
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2 answers
171 views

Forcing `kernel_task` to swap memory?

I have had a week-long compression process run on an MacBook. When it hit 95%, the speed suddenly dropped to just 5% CPU usage. Tracing the problem, I found that kernel_task is taking up 6.87GB, ...
Alex's user avatar
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Can't find some kernel logs that could be seen in previous macOS versions

I am looking for the kernel log messages that are output during the macOS hibernation process. As an example: 8/20/14 11:58:40 AM kernel wired_pages_encrypted 60968, wired_pages_clear 39229, ...
Desert Scuba's user avatar
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1 answer
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How to handle a kernel_task going wild, wrongly trying to cool my Mac?

I have a very annoying bug on my iMac 2019 (27", Retina 5K, i9, 8cores, Monterey, Radeon Pro Vega 8 Gb, 64GB Ram). It's likely caused by a hardware problem but also triggers a software bug I ...
Hugues's user avatar
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79 views

Delays to Sleep and Wake notifications

Is it normal that there are Kernel Client Acks every so often while my Mac is asleep indicating that there are delays on several drivers? I found entries like this via the command: pmset -g log | grep ...
Blurfquarf's user avatar
2 votes
1 answer
112 views

How to access the latest version of the Darwin Kernel Programming Guide?

The Darwin Kernel Programming Guide has been last updated on 2013-08-08, and the mention "Documentation archive" is in the title bar. So, my question is : How to access the latest version of ...
Ortomala Lokni's user avatar
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On Lockdown mode, why am I being prompted to allow an SD card to connect even though I don't enter any peripheral?

I am running Venture 13.5 on a M1 MacBook Pro. Because Lockdown mode is on, I am prompted to approve/deny each time a USB device is plugged into my machine. However, I am also randomly being prompted ...
angryserver's user avatar
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176 views

usb-c SD card reader works only if connected via usb-c to usb-a adapter (for a short time), flawless on other OS

I have two "survival kits" with USB cables, adapters, etc. on a credit-card size phone cradle. Very nice gizmo ... The two of them have an SD card reader built in, and both of them are ...
Rho Phi's user avatar
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2 answers
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What are the HighPoint, SoftRAID macOS software extensions?

While cleaning some software off my computer, I noticed the following extensions listed in System Information → Software → Extensions. For context, I am running an M2 Max MacBook Pro with MacOS ...
Ben Zelnick's user avatar
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Random system freeze with kernel_task using 100% of one CPU core, how to diagnose?

For a couple days I’ve been having random hangs from macOS. It seems to happen quite often when opening PDF files stored in Zotero with an external reader (PDF Expert) but it is not limited to that—...
tb87's user avatar
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3 votes
1 answer
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Do you need to allow kernel extensions to use samsung t7 hardware on a Macbook pro M1 13 inch?

Do you need to allow kernel extensions to use Samsung t7 hardware on a Macbook pro-M1 13-inch?
Matthew Oliveri's user avatar
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190 views

Very unreasonable use of CPU by system [duplicate]

Im quite new to mac enviroment, but been on Ubuntu for years.. Thing is, till last week everything seemed smooth and nice, i was ready to sign on to "apple just works" mentality, but then ...
Clomez's user avatar
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4 votes
3 answers
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Kernel Panic - assert failed: [14083]:low wA f4 i1875522 s3180082 n16 d0 w1.6 tGC9 tL30

For the past 2 weeks, I've experienced a few Kernel Panics. When looking at the crash logs, it specifies that there was an assert fail, containing the following information: panic(cpu 1 caller ...
Hunter T.'s user avatar
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Is there any place in which I can dig into the Hypervisor Framework source?

So far I've been looking into XNU source, the official Open Source site and the only documentation I found for it. In any case I wasn't able to really find something I can use for understand the ...
ca-hercor's user avatar
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2 answers
283 views

What is the Apple equivalent of the Linux kernel argument memtest?

Linux has a kernel argument memtest: Specifies the number of memtest passes to be performed. Each pass selects another test pattern from a given set of patterns. Memtest fills the memory with this ...
Evan Carroll's user avatar
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dealing with high kernel_task cpu usage

I experience high kernel_task cpu usage problems on my MacBook Pro (16-in, 2019), macOS Big Sur 11.4. How to find cause of high kernel_task cpu usage? The solutions above don't seem to apply to my ...
user1424739's user avatar
1 vote
1 answer
2k views

How do I list which frameworks are in use by macOS?

Apple keeps frameworks in /System/Library/Frameworks/ and /System/Library/PrivateFrameworks/. Inside these directories are *.framework files, which are themselves a directory of computing resources (...
Chris's user avatar
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macOS keeps restarting due to apparent kernel/CPU panic

My Macbook Air 13" 2019 running Big Sur 11.4 has been having these issues for a while. I've narrowed down the issue to a third party kext as running in safe mode prevents restarting/CPU panic. ...
Jack Stanton's user avatar
1 vote
1 answer
129 views

Why is sleepimage and swapfile filled with zeros?

If I look at the contents of either sleepimage or swapfile in /var/vm, I find that it's just 1.07G of null bytes. I'd expect them to contain actual data, or if they're not being used to be a 0B file. ...
1110101001's user avatar
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2 answers
235 views

How to not let kernel_task take too much CPU when the machine is hot?

https://grafxflow.co.uk/blog/mac-os-x/delete-ioplatformpluginfamilykext-macos-big-sur The above instruction is based on an assumption. Does anybody know a general solution to the problem (for example, ...
user15482691's user avatar
2 votes
1 answer
318 views

Where is kernel_task?

I see kernel_task in Activity monitor. But I cannot find where the binary file is using Spotlight. Does anybody know where the binary is found on the disk? I am using Big Sur 11.4. But my question may ...
user15482691's user avatar
1 vote
0 answers
202 views

Slow BOOT / Mac Mini 2018 cause: X86PlatformPlugins

After the BigSur update i've noticed a way slower boot time on my Mac Mini 2018. Before would boot in 10-12Sek now it takes about 1'. After booting into the verbose mode i found the Problem and where ...
andrei_s's user avatar
6 votes
2 answers
2k views

Mac stuck booting after Monterey

I have a 2017 27in retina iMac booting off of a (stable) DIY m.2 usb drive (controller: Realtek RTL9210 NVME). I upgraded to Monterey (public release - NOT beta) on Oct 25, the day it was released. It ...
anonymousaga's user avatar
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60 views

Absolutely no keyboard communication between Computer and board?

So I was given an Early 2009 iMac which was running Snow Leopard. I went and tried to install DOSDUDES Catalina Patcher OS on the computer and it failed and all of a sudden I've lost all communication ...
Spumquats44's user avatar
2 votes
0 answers
41 views

How to check system integrity after uninstalling VirtualBox kernel extensions

I recently installed VirtualBox on my Mac. Then it didn't work as I expected so I decided to uninstall it. But apparently VirtualBox installed kernel extensions. I uninstalled VirtualBox with the ...
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iMac late 2012, temperature issues

I have a late 2012 iMac that's always worked really well but out of the blue it started to slow down significantly. It will work fine for half an hour and then slow to a crawl, cursor drags, starting/...
echoplex's user avatar
0 votes
1 answer
218 views

SSD Writing and Memory Swapping Issues

Recently I am recording the amount of data written in my SSD from kernel_task on my new M1 MacBook because that is the main source of memory swapping. I found that memory swapping is less when the ...
CELLSecret's user avatar
-1 votes
1 answer
275 views

What are the benefits of XNU using Mach features compared to a full FreeBSD kernel? [closed]

The Darwin kernel is a hybrid of Mach and FreeBSD. What are the benefits of using such a hybrid architecture compared to a full FreeBSD kernel? I'm not looking for subjective opinions of why this ...
Wilbert's user avatar
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3 votes
1 answer
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How to check max allowed open files (ulimit) of a running process (or running app)?

In Linux, I can check the max allowed open files (ulimit) of a process by simply executing $ cat /proc/<PID>/limits Limit Soft Limit Hard Limit Units ...
sgon00's user avatar
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5 votes
1 answer
4k views

kernel_task taking too much CPU despite low CPU temperatures

I have a MacBook Air 2013, which randomly started having issues with the fan speed shooting up (from booting and no applications running) and just completely slowing down. Apple said it was a problem ...
Derek's user avatar
  • 51
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0 answers
324 views

Kernel panics from Spotify

Lately, I keep getting kernel panics, with the report indicating that the culprit is the Spotify desktop app. I'm on a 2014 iMac, with huge amounts of RAM and free space, and I've done a hardware test ...
Skeptic's user avatar
  • 113
1 vote
1 answer
2k views

WindowServer and kerneltask using a lot of CPU in Big Sur

I have seen these two questions WindowServer high CPU usage, spikes when moving cursor on M1 MacBook Big Sur MacBook Pro - High CPU Under Low Workload and I have the same problem with WindowServer on ...
d-b's user avatar
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1 vote
0 answers
59 views

Kernel_task uses 15% of CPU, but stops as soon as the computer is used? (10.15.7, Mid 2012 15" Retina MBP)

I have a 15" Mid 2012 Retina MacBook Pro (2.7ghz i7, 16gb of RAM) that I use as a headless server in my house. It's currently running 10.15.7, which is the last supported MacOS release it can run....
mrhomer's user avatar
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0 votes
0 answers
52 views

"Hang In The Main Graphics Engine"

Mac: MacBook Pro, mid2012, 9,1 Core i7 2.3Ghz, 16 GB RAM, 1TB SSD, nVidia 650M, IntelHD 4000 I use several macOS systems incl. the default one - Lion. 2 weeks ago slowdowns began to occur - apps slow ...
Elijah's user avatar
  • 21
0 votes
1 answer
341 views

Are kernel extensions also stored elsewhere?

I discovered a kernel extension earlier in this path "/Library/Application\ Support/VirtualBox/VBoxDrv.kext". What confuses me a bit, are extensions not saved in /Library/Extension?
BabyBoy's user avatar
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0 answers
30 views

kernel_task at ~1000% on a 2019 macbook pro [duplicate]

I use a MacBook Pro 2019 and it increasingly often starts to run kernel_task at ~1000%. Fans are blowing too. I tried to cool down the computer with some additional device and also used Fan control to ...
Christian's user avatar
  • 527
2 votes
0 answers
985 views

MacBook Pro - High CPU Under Low Workload

I've got the MacBook Pro 16" 2019 (2.3 GHz 8-Core Intel Core i9, AMD Radeon Pro 5500M 4 GB). Since upgrading to macOS Big Sur, I've been experiencing an issue whereby the system will become ...
asimplecore's user avatar
2 votes
1 answer
1k views

Kernel panic on shutdown and restart

When shutting down my Mac, it takes 1-3 minutes to shutdown. The screen goes black for a few seconds, then the kernel panic message appears. I'm using a 2017 27-inch iMac, with macOS Big Sur 11.1. ...
twlscnds's user avatar
  • 1,087
1 vote
0 answers
5k views

How to correct AppleKeyStore failures during boot

I have the following setting: $nvram boot-args boot-args idlehalt=0 serverperfmode=1 -v Because I have the verbose boot logging flag, during my MacBook Pro (15-inch, Early 2011) High Sierra 10.13.6 ...
bento's user avatar
  • 141
0 votes
1 answer
483 views

Why won't kern.maxfiles setting in /etc/sysctl.conf stick on macOs 10.15?

i was getting some strange errors and crashes on some apps including the finder. I figured out it happens due to the kern.maxfiles kern.maxfilesperproc settings i was following the advice from here ...
verstaerker's user avatar
0 votes
0 answers
194 views

Macbook Pro Mid-2015 - Rightside Fan 0rpm - Sensor Error?

I have a recurring issue which is causing me problems: My MacBook Pro mid-2015 rightside fan seems not to be working. I have used different software (Macs Fan Control, iStat) to determine this. This ...
Mike's user avatar
  • 11
0 votes
1 answer
2k views

How to disable and reenable Thunderbolt 3 port in Mac OS Catalina?

So all of a sudden my MacBook went really slow, I contacted apple support tried everything they said, resetting nvram e.t.c, wiped out my entire disk and reinstalled the macOS, but the problem still ...
Rehan Ali Khan's user avatar
0 votes
1 answer
278 views

How to solve high CPU usage after Time Machine recovery

I reinstalled macOS and restored my data using Time Machine. After using the restored OS for a while, I discovered that kernel_task's CPU usage is really high. I mainly use my Mac for music production,...
Akrem Amous's user avatar
2 votes
2 answers
433 views

Can macOS's ramdisk be swapped to disk by the operating system?

I want to create a secret provisioning systems that on deployment decrypts secrets on the target machine and put them in RAM. They should be accessible as file so that services on the same machine can ...
Mic92's user avatar
  • 321
0 votes
0 answers
83 views

What are the limitations of Trusted Platform Modules?

Apple introduced DMCA measures (like DSMOS and CPUID Validation) instead of attempting to utilize a Trusted Platform Module (which was physically present on hardware but did not have drivers on Mac OS ...
Kittywhiskers Van Gogh's user avatar
1 vote
0 answers
92 views

2017 MBP has started to degrade in performance - dreaded kernel_task

All - My normally stable mbp 2017 has started slowing down with kernel_thread dominating the CPU in recent weeks. This condition persists across reboots. My primary concern is that the machine is ...
NJL's user avatar
  • 51
3 votes
0 answers
697 views

Undefined Kernel Panic on macOS 10.15.5

I encountered an undefined kernel panic on MacOs Catalina 10.5.5. When panic occurs, the screen goes black suddenly and tihs page appeared: After, Mac restarts itself. I got the panic logs: Log 1: ...
berkb's user avatar
  • 227
9 votes
1 answer
43k views

Kernel Task is using 1000% of The CPU on macOS Catalina [duplicate]

My MacBook Pro running on macOS Catalina is really slow and the kernel task is using 1000% of the CPU !! I tried all the solutions suggested in MUF How to Fix Your Mac’s “kernel_task” High CPU Usage ...
Mouayd's user avatar
  • 91
1 vote
1 answer
6k views

Where are the memory and kernel logs stored in macOS Catalina?

I want to learn how to debug kernel crashes and am not at all familiar with macOS logging. Specifically the logs files that might reveal a system crash for example due to kernel panics. Does Apple ...
Abhishek Chaudhary's user avatar

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