Questions tagged [kernel]

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

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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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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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1answer
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CPU stuck at 0.8Ghz on iMac late 2013 2.7Ghz because of kernel_task

I know it seems like this question is like the dozens of other questions about CPU overheating and kernel_task overloading it, but nope. I found an iMac (yep, found it. In the trash). I fixed it (...
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In which version(s) did macOS transition from 32-bit to 64-bit?

From my research, it seems that macOS transitioned from 32-bit x86 to 64-bit x64 across the following versions: Kernel App Support 10.4 Tiger x86 ...
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My MacBook pro late 2011 15" has 800% usage with kernel_task

So my MacBook Pro is getting super slow and laggy after a while of usage. I updated to Sierra today and my kernel_task is sky-rocketing - hitting up to 1100% and I have no idea why? I've tried all ...
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What does “Failed to open swapfile” mean and is it a problem?

A couple of times a day my fans start spinning, ready for take off. The activity manager shows that Mail is eating up my CPU, 250% and more. The console shows the following lines: 13-09-16 10:46:46,...
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405 views

Kernel Task High CPU and Strange Activity from Other Apps

In Activity Monitor, kernel_task is showing that it is using 90% CPU. Chrome can't keep 2 tabs open at the same time without showing "Aw Snap." Other apps are slow and my fan is running at full speed. ...
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Is there perf profiler tool for Mac to trace all page faults?

I'm looking to install perf which is a kernel profiling tool for Linux. Basically I'm trying to trace all page faults, so I run equivalent of: sudo perf record -e page-faults -ag Is it possible to ...
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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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Why does kernel_task cpu% grow unbounded until forced reboot? [duplicate]

I saw an issue with my MacBook Pro running El Capitan with Chrome running that the kernel_task went haywire and started sucking up all the available CPU and the % cpu just kept climbing to where it ...
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Swapping HDDs w/ Different OSX Versions, Possible?

My situation: I have a "late '08 aluminum" Intel 64-bit MacBook, still have Snow Leopard installed, and XP via Bootcamp, all on the original hard-drive. Yes, it's my "legacy" setup. The HD is 7 years ...
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987 views

help me !! my computer is having kernel panics and i don't know how to stop them?

My computer is a Macbook Pro 13 inch from early 2014. In October of 2015 my computer started crashing. I sent it to an Apple Center to see if they could fix it. They changed a lot of things, hardware, ...
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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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1answer
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Can't find kernel.log file on Yosemite

I began kernel programming on mac. Because I want to run my kernel extensions without code signing I had to do the following: sudo nvram boot-args=kext-dev-mode=1 It works as it should be, but the ...
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What happens when the kernel_task is killed?

What happens when you kill kernel_task on OS X? Is that even possible? I know that the system reboots because of kernel panic when you kill launchd, but I can't find any resources online and am afraid ...
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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. ...
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How can I increase the maximum allowed swap space?

When I try to do a calculation that needs to allocate and use 128 GB of memory (it is a command line program written in C), the kernel kills my process with extreme prejudice. This console log entry ...
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Why does leaked memory appear malloced to kernel_task, and why can't OS X therefore garbage collect it

I have previously been told that a sign that some application has a memory leak is that kernel_task has a large memory footprint, commonly on the order of gigabytes. If an awry kext was causing this ...
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Console Message: “kernel: Sandbox: net.conceited.Ru System Policy: deny(1) mach-priv-task-port 391”

I'm getting about 50 messages like the following on the console every second. 01/09/15 17:50:32,000 kernel[0] Sandbox: net.conceited.Ru(295) System Policy: deny(1) mach-priv-task-port 402 01/09/...
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How to read and understand kernel reports?

When trying to troubleshoot kernel panics and I look at a log, I see these: 0xffffff821bd9b510 : 0xffffff802fd2bda1 I would like to know if there is any possible way of reading these, or ...
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What is a Kernel Panic and what does it mean?

I have this report: Anonymous UUID: Removed Tue Aug 11 20:26:13 2015 *** Panic Report *** panic(cpu 2 caller 0xffffff8028bc1cde): "launchd died\nState at Last Exception:\n\n"@/SourceCache/xnu/...
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How to disable SpeedStep/XCPM on Macbook Pro 11,1 OSX 10.10.2?

Does anybody know how to disable OSX from throttling/underclocking the CPU on a Macbook when the battery gets low on power? I think the feature is called SpeedStep. The problem is that my battery is ...
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1answer
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What's a normal value for kernel_task RAM usage?

Just bought a new MacBook Pro 12.1, early 2015 (Yosemite 10.10.4). I'm observing memory usage from kernel_task varying between 0.8-2.0 GB. Is it normal? Couldn't find a question referring to normal ...
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Very high kernel_task CPU usage after updating to Yosemite 10.10.4

I updated to 10.10.4 on July 1, and ever since I've had very high CPU usage - roughly 270%, i.e. two and a half of four processors - by kernel_task. It appears on login for about five minutes, then ...
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kernel_task filling up disk

Something weird just happened. I got a warning that my disk was running out of space. I knew that it had like 15GB free before and wondered where all the free space went. I checked Activity Monitor ...
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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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479 views

Issues with /usr/lib/libcups.2.dylib. x86 applications will not execute

I upgraded CUPS from 2.0.0 to 2.0.2 on OS X 10.10.4 Yosemite for security reasons per advisement from a Nessus scan. I committed the cardinal sin of not backing up my OS before making this change. ...
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Mid-2014 15" rMBP: Crashes on OS 10.9.5

Update #2: The MBP crashed at 1:31am in the morning while sleeping. Console log and kernel panic log enclosed below: ======== Console Log: 4/22/15 1:29:52.000 AM kernel[0]: AppleCamIn::...
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1answer
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Is there a way to see what kernel task is doing?

I found a question (and answers) about What exactly does kernel_task do?. What I want to know is how I can inspect what kernel_task is doing at any given moment in time? Does it get logged so that I ...
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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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How to investigate high kernel task memory usage?

I was using my MBP (with 16GB of RAM) as usual and out of blue I've this popup that: Your system has run out of application memory. To avoid problems with your computer, quit any applications ...
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Inspecting kernel_task

I have two MacBooks, one with a fresh OS X install and one with an older install. The older one has a kernel_task taking 1.52 GB of RAM. The newer one—416 MB. These aren't identical machines or ...
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1answer
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How can I identify files and programs connected to the kernel_task process in Mac OS?

I understand that the kernel_task process is linked to several .kext files found in System/Library/Extensions (and possibly Library/Extensions ?) How can I identify which files are contributing to ...
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Kernel_task boosts CPU to 300%-500% (Yosemitte MBP 2011 without a battery) [duplicate]

Long story short, my oldie MBP 2011' battery started bloating, I've contacted a repair service center and they advised me to remove the battery and use it on AC power, while they get a new battery for ...
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1answer
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How to find what cause Mac OS kernel panic?

For last times i have kernel panics at least once a day. Anyone have suggestions how i can find what cause issue and how to fix it? I have latest Yosemite updates installed. Here is latest Problem ...
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Why won't kern.maxfiles setting in /etc/sysctl.conf stick?

I've been getting various "too many files open in system"-type errors on Yosemite (10.10.1). Searching around suggests setting kern.maxfiles and kern.maxfilesperprocess in /etc/sysctl.conf. I've ...
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Is it theoretically possible for DirectX to work on OS X natively?

As far as I can tell, DX as a software-component is tightly wound to Windows as for hardware-acceleration and is provided as a set of DLLs and a runtime system for applications that depend on it; ...
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2answers
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Macbook Pro.[Mid-2012] Sound isn't working

Suddenly, My MBP sound isn't working. I have tried couple of way to resolve the problem but nothing is working. Here is some of the screenshot: No, input or output sound. I would like to know 1) How ...
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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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How to disable logging to system.log in OS X?

During my time with Yosemite, I've had an innocuous issue that gets logged to system.log non-stop. This question is not about solving the issue. I'd like to stop the chatter, because they're writes ...
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What font is used during verbose boot mode?

When booting OS X in verbose boot mode (⌘+v on startup), the log is printed on screen. It seems different to the kernel font, but it might just be a smaller version of it. inverted screenshot ...
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448 views

iTerm2 cannot be opened even after SMC and PRAM resets

I got a gray screen due to "A kext releasing a(n) AppleHDAEngineOutput has corrupted the registry." Once the computer restarted, I cannot open iTerm2 anymore. A 1-lined terminal shows up without the ...
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Kernel Panic (?) on new 2014 MBP

I bought a new 2014 macbook pro two weeks ago and yesterday I've had 2 consecutive grey screens with restart and another one today. It happened while opening a movie in vlc or when exiting full screen ...
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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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What does “Vector 0xdd(TMR)” do and how can I fix a problem that I'm having with it?

I am currently having problems with kernal_task using ~2GB of RAM and looking at what advice exists I ran sysdiagnose and in powermeterics.txt I found that Vector 0xdd(TMR) was doing ~20,000 ...
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1answer
580 views

MacBook Air slow after waking from sleep

The backlight on my MacBook Air broke about a week ago and it fixed by Apple by them replacing the logic board. Since I've got it back I've had a couple of issues. Firstly, the machine wouldn't work ...
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1answer
690 views

Force a read-only mount of startup disk

I want to create a MacOS recovery startup disk on a USB flash drive. In order to maintain the integrity of the drive's contents (and, perhaps more importantly, reduce write wear on the flash drive ...
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1answer
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rEFIt defaulting to 32bit kernel

rEFIt is defaulting to the 32bit kernel of OS X which will not boot and will show this error message: at boot I have to press F2 then manually select the 64bit kernel. How do I change the default ...
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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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OSX programs crashing, 'Kernel: file: table is full'

Over the last few months, I've seen increasingly erratic behaviour on OSX (10.8.5). Chrome won't load elements on a page, my dev tools crash etc. Recently I had a look in Console and found that ...