Questions tagged [kernel]

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

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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 ...
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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 ...
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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 ...
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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 ...
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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....
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“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 ...
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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?
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Do video plugins need extensions?

As far as I know I need virtual audio and video inputs / outputs, an extension under / Library / Extension. As I have learned, the kernel "/ Library / Extension" connects the software and ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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Kernel panic when high cpu

for some months i started to get kernel panics on my macbookpro touch 2016. Today they are consistent, whenever i try to export batch photos with adobe camera raw or capture one it is always crashing ...
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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 ...
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how to solve High CPU usage after time machine recovery

I reinstalled mac and recovered my data using time machine , I mainly use my mac for music production and use Ableton as a DAW After some time using it i found out that the kernel_task is really high ...
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2017 Macbook Pro running on macOS Catalina (10.15.6) keeps repeating kernel panic (black screen) and the Apple Geniuses can’t figure out the problem

My 2017 MacBook Pro, running the latest version of macOS Catalina keeps crashing after a fresh install. The Apple Geniuses were not able to find the issue and hoping someone may attaching the kernel ...
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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 ...
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Why kernal_task kill the process?

My Mac became very slow and lagged (can't use it normally) I opened the activity monitor to check where's the issue but I could not reach to a good result because the kernel_task was the process which ...
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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 ...
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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 ...
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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: ...
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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 ...
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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 ...
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How to differenciate Legitime Kext in Catalina?

Since I have updated to MacOS Catalina 10.15.5 I was notified about the Kext 3rd-party deprecation (Even notifying me I have 2 3rd-Party Kext loading by default at the start-up of the Mac). Since this,...
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iMac restarted 4 times in 24 hours because of a problem

I have a 2017 iMac, 27", with a Fusion HD and it has restarted 4 times over the past 24 hours. I saved the last report. Can anyone discern even a hint as to what is causing it looking at this report?...
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Fans blaring again after a brief hardware fix

My 2017 MacBook Air began having a problem with a high kernel task and high CPU with fans blaring. I did a hardware test and it said there may be an issue with the SMC PFM006, there may be an issue ...
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Apple Diagnostic Result PFM006 and Kernel_Task taking upto 300 % of CPU and Depleted Battery

My Macbook Air (2018) Retina battery has depleted within 130 cycles. I was running Windows via Bootcamp in heavy load, letting it discharge fully and charge repeatedly. If I unplug from power source ...
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kernel_task, high CPU and fans going crazy, no applications open, no launch agents/daemons

i've tried to debug this for a couple days straight now and can't find out what's causing the kernel_task to go so unruly. i've removed nearly all my third party kexts, done so many etrepro's, and i'...
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What is kernel_task reading and writing?

On my machine, kernel_task has a very large number of reads and writes compared to my usage. I spend almost all my time online on google chrome. Over the past month, Activity Monitor shows ...
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FTDI USB to serial module doesn't work in Catalina [closed]

I can see FTDI module in system report But in arduino it doesn't show up I read that macOS comes with USBSerial.kext which can handle this but I don't see it working for me. I have tried installing ...
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How to change kernel security level?

My Mac had a kernel security level of 0. Then, I changed the kernel security level to 1. Here's how I changed it to 1: sysctl kern.securelevel=1 I'd like to change it back to 0 becuase my hosts file ...
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Does the bootcamp with Windows 10 use the same kernel that the MacOS uses on a Macbook Pro?

I am just wondering how the boot camp on the macbook pro works? Does it use the same exact kernel as the one that the MacOS uses? Or does bootcamp switch over to a kernel for the windows 10?
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What side to charge MacBook Pro 2018 with high kernel_cpu task usage?

This is in reference to the answer posted at How to find cause of high kernel_task cpu usage? which suggests that you should move your charging to the right side thunderbolt. However, based on the ...
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kernel_task on Macbook hogging CPU even after OS upgrades/downgrades; possible Flash malware?

On a Macbook Air (13-inch, Early 2015) my girlfriend got one of those "upgrade Flash" pop-ups and hit (Continue/Okay/etc?). This may or may not have anything to do with the current problem but ever ...
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Can I change my kernel security level?

When I run sysctl kern.securelevel on my Mac, it gives me a value of 0. I'd like to increase the kernel security level on my computer. I want it to give me a 1. Can I do that?
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debug kernel_task large memory usage

htop shows kernel_task used 25% of the memory on 8GB memory Macbook Air. But the sum of the size column of kextstat is only 31830608. I think this number is in bytes? Why is there a difference in ...
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kernel_task takes a lot of memory

My kernel_task takes 71.2G VIRT and 2386M RES (in htop screen). I'd like to understand what takes so much resource. But I don't understand what is wrong based on the output of sudo zprint -t https://...
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BUG in system.log, DEPRECATED USE in libdispatch client. Strange things in system report [duplicate]

MacBook Pro 13" Mojave 10.14.6 2.3 Ghz 8 GB RAM 512 GB Memory intel I5 (4 cores) I believe I accidentally deleted an important file days ago. Since, the CPU has been riding high, unit is very warm ...
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Looking for the Kernel Debug Kit for build 18G2022?

I'm looking for the Kernel Debug Kit (KDK) for 10.14.6 build 18G2022. I see all the KDK's here, but 18G2022 hasn't been posted yet? https://developer.apple.com/download/more/?q=Kernel%20Debug%20Kit ...
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Is the source code for xnu-6153.60.66~39 available? (iOS 13.3 Kernel)

I cannot find xnu-6153.60.66~39 at https://opensource.apple.com/tarballs/xnu/ ! Does apple still open source the XNU Kernel?
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How to make a bootable partition from scratch?

What I want to achieve is to make a new bootable partition on my MacBook's SSD, so it should be possible to press Option key on startup and choose this partition to boot from. Why do I need that? I ...
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2answers
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colorsync.display high cpu

PID 217, colorsync.display is pegged at 119% CPU, any ideas what this is or what might be causing it? EDIT: It is happening again EDIT EDIT (12/27/2019): Happening again with no cause known yet... ...
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sysctl setting net.inet.tcp.keepidle removed in 10.15. Is there a replacement setting?

My work requires long-running connections to databases that required this sysctl setting in earlier OSX versions. Since it no longer exists, these connections appear to remain open, but they ...
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Command to release the best amount of Kernel Task and Memory Ram

I have an old MacBook Pro 2012/2013 and it has the El Capitan Through the Utilities -> Activity Monitor tool I can get the following stats according the following behavior: For example if the Mac ...
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1answer
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Run Rosetta on macOS Sierra

I'm wondering if there is any way to run Rosetta on macOS Sierra. In this post, someone mentioned that Rosetta may uses the Carbon framework, which appears to exist in up to macOS Sierra. Are there ...
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Why is macOS limited to 1064 or 2088 processes?

In macOS, the system is limited to running no more than 1064 processes (or 2088 starting with Catalina) systemwide, and individual users are limited to 709 (or 1392 in Catalina). Why is there a limit? ...
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Where can I find the official documentation of macOS Kernel Debugging?

I want to study kernel debugging on macOS, and hence have tried to find official documentation for macOS Kernel Debugging. Currently, I'm only able to find up-to-date or complete information on third-...
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Kernel Panic Help - 2013 Mac Pro (Trashcan)

Been getting this k-panic once a day for the past year or so... No rhyme or reason to it, but it happens at least once a day. System slows down just a little bit, not to an unusable point, however... ...

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