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

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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 ...
17
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1answer
19k views

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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1answer
1k views

Error message, “hpPlugInInit.kext was installed improperly”

I recently bought a MacBook Air and transferred my system information and user data via Migration Assistant. I used to get error messages on my old computer like this: The system extension ...
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0answers
2k views

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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1answer
110 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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0answers
46 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 ...
4
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2answers
4k views

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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3answers
8k views

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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1answer
86 views

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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1answer
264 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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1answer
394 views

What bitness is Mountain Lion kernel, because `uname -p` returns `i386`?

I know, the answer should be 64, as Apple dropped support even for their early 64 bit models BUT: Nathan-der-Graue:~ max$ uname -p i386 while on the other hand: Could someone please explain this ...
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0answers
177 views

What can cause multiple processes on Mac with the same PID in some cases?

Why are there are many similar processes running at the same time with the same Process ID? For instance: 2 SystemUIServer with the same PID same user both IPv4
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1answer
93 views

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 ...
6
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1answer
984 views

How to access /dev/mem in OSX?

How I can access /dev/mem (or /dev/kmem, /dev/pmap) equivalent device in OSX? As far as I know it was removed in some point. Can I create this node manually somehow or any other way of dumping the ...
4
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1answer
150 views

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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0answers
44 views

Does Mac OS X have kernel protection mechanism preventing system call table manipulations?

I am looking for a feature in Mac OS X that will specifically protect system call table in the kernel from modifications and hooking, something like Kernel Patch Guard. Is there such a feature and ...
0
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0answers
208 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. ...
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0answers
49 views

Mac mini, restarting and kernel panic

I have had repeated restarts on a Mac mini (late 2012). I don't really understand the log, but I was hoping someone might be able to break it down and possibly offer some solutions. Thank you *** ...
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2answers
1k views

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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0answers
1k views

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 ...
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1answer
78 views

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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3answers
4k views

What is a Kernel Panic and what does it mean?

I have this report: Anonymous UUID: 84DCCF22-1516-5255-9602-7222ECDA9095 Tue Aug 11 20:26:13 2015 *** Panic Report *** panic(cpu 2 caller 0xffffff8028bc1cde): "launchd died\nState at Last ...
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2answers
827 views

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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2answers
7k views

I'm suffering from the excessive CPU use from kernel_task

My mac recently has gone wild with kernel_task. It slows down the computer, the fans blow wildly for around ten minutes after startup (shut down, restart or sleep). I did an EtreCheck scan and got ...
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0answers
433 views

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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0answers
487 views

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 ...
13
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5answers
28k views

How to disable the SpeedStep when using MacBook Pro without a battery?

First of all, the specs: MacBook Pro (15-inch, Early 2011) OS X 10.9.1 (Mavericks) 2.3 GHz Intel Core i7 8 GB RAM The Problem Recently, my battery randomly died and I had to disconnect it, ...
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0answers
170 views

SIGSEGV kernel panic every 30 minutes

I'm experiencing a kernel panic every 30 minutes on my MacBook Pro and I don't know why. Here is the last log but I don't know how to read it! Process: com.apple.WebKit.WebContent [477] ...
2
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1answer
404 views

Why doesn't /proc exist in OS X?

What is the reason that /proc does not exist in OS X? I was curious to find file descriptors that a process was using in my Mac. The way I do it in linux is to go in /proc/fd folder of that process. ...
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0answers
343 views

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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6answers
3k views

My mac has 64-bit EFI, but it only boots with 32-bit kernel

I followed the guide at http://macperformanceguide.com/SnowLeopard-64bit.html to boot into 64-bit mode. I had no problems with the instructions and on the boot screen it says "PAE enabled, 64bit mode ...
0
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1answer
340 views

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]: ...
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1answer
125 views

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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0answers
422 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 ...
7
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3answers
1k views

How to get a mac to wait longer for external disk to wake up upon resuming from sleep?

My Mac has an external disk attached, and I often get "disk not ejected properly" warnings after resuming the computer from sleep. These warnings appear only when the disk has spun down during the ...
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1answer
1k views

MacBook pro boot Kernel panic no kext summary

Yesterday my Mac crashed and after trying to turn it on again I recieved a message like this: panic(cpu 0 caller 0xffffff800667b0b2): "VM page 0xffffff800ad5fad0 should not have an ...
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2answers
452 views

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 ...
3
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1answer
313 views

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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1answer
3k views

Mountain Lion Screen Freeze

My Mountain Lion is keeps freezing from few weeks, today it freezes/crashed couple of times already. Here is the log before the big freeze (file /var/log/system.log): SIMBL Enabler for Sandboxed ...
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2answers
454 views

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 ...
3
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1answer
4k views

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 ...
2
votes
2answers
2k views

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) ...
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2answers
666 views

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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3answers
36k views

What exactly does kernel_task do?

I'd just like to know what it is that kernel_task is responsible for. Also, what's an acceptable maximum RAM and CPU use for it?
3
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1answer
1k views

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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1answer
254 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 ...
2
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1answer
350 views

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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0answers
344 views

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 ...
17
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2answers
8k views

Insanely high kernel RAM usage (over 9GB) in Mavericks

I upgraded to Mavericks yesterday, and everything seemed to go fine, but today I noticed that my computer was becoming a bit slow. I checked Activity Monitor, and CPU / disk were at normal levels so I ...
2
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3answers
426 views

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 ...