The core part of an operating system.

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3answers
2k 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 ...
2
votes
2answers
116 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 ...
1
vote
2answers
6k 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 ...
1
vote
2answers
2k 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 ...
0
votes
0answers
94 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 ...
0
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0answers
113 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 ...
12
votes
5answers
18k 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, ...
0
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0answers
77 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
votes
1answer
142 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. ...
0
votes
0answers
103 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 ...
1
vote
0answers
126 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. ...
2
votes
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 ...
2
votes
1answer
2k 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 ...
0
votes
1answer
196 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]: ...
1
vote
1answer
77 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 ...
1
vote
0answers
342 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
votes
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 ...
1
vote
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 ...
2
votes
2answers
190 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 ...
1
vote
1answer
193 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 ...
1
vote
1answer
2k 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 ...
1
vote
2answers
303 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 ...
0
votes
0answers
58 views

Temporarily disable AES-NI hw.optional.aes setting via sysctl

Posted already on Stack Overflow, no answers though: http://stackoverflow.com/questions/28268498/temporarily-disable-aes-ni-hw-optional-aes-setting-via-sysctl For testing reasons I would like to ...
3
votes
3answers
2k 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 ...
2
votes
1answer
2k 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 ...
1
vote
2answers
1k 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) ...
0
votes
1answer
929 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: ...
-1
votes
2answers
215 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; ...
11
votes
3answers
25k 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?
2
votes
1answer
641 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 ...
0
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1answer
145 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
votes
1answer
303 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 ...
1
vote
0answers
306 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 ...
14
votes
2answers
7k 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
votes
3answers
304 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 ...
4
votes
1answer
471 views

MacBook unusable due to kernel_task

I've disabled hibernation, and removed the sleep image file. I shutdown my Macbook Pro (15" retina), unticked the box to open windows on restart, and started my MacBook again. As soon as I'd logged on ...
4
votes
1answer
559 views

How do I increase “ulimit -u” (max user processes)?

I can change all of the usual ulimits via (for instance) ulimit -n 8192 and launchctl limit maxfiles 8192 8192. Somehow, this doesn't seem to work for -u, the maximum number of user processes: ~$ ...
3
votes
1answer
318 views

Can OS X dump cores in the working directory instead of /cores?

I don't know when it started, but at some point, OS X started dumping cores into a special folder (/cores). This is a pain since they get jumbled together and it's hard to keep track of which core ...
0
votes
1answer
300 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 ...
1
vote
1answer
178 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 ...
2
votes
2answers
865 views

Serious system issue - kernel extensions installed improperly

I have just gotten an error message for every single kext file there is. the error message goes something along the lines of: The system extension "*file path*" was installed improperly and cannot be ...
0
votes
1answer
45 views

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 ...
2
votes
2answers
1k views

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 ...
2
votes
0answers
494 views

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: ...
3
votes
2answers
8k views

Upgrade to OSX 10.9 from 10.8 causes random restarts

I recently upgraded my MacBook Pro (late 2011, core i5 2.4ghz, 8 gigs of ram) to OSX 10.9 from 10.8 (which in turn I upgraded from Lion). The installation seemed to go well and everything was great ...
6
votes
1answer
682 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 ...
2
votes
1answer
368 views

Error in logs: kernel[0]: Validation failed, dataSuffix

I've the following errors in my system logs when running Pages (or any iWork app): Aug 4 19:01:09 kernel[0]: Validation failed, dataSuffix: Aug 4 19:01:09 kernel[0]: b9 d5 6f e2 28 3e b9 48 82 12 ...
2
votes
2answers
2k views

kernel_task is using 90% CPU, what could be the cause?

I have a 13" MBP late 2009, 2.53 GHz, 4 GB RAM, and on OS X 10.8.3. As soon as I boot up the fans start going at the highest rpm and like I mentioned the kernel_task is always at around 90% when no ...
1
vote
0answers
462 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 ...
4
votes
3answers
1k views

I see thousands of these in my Console log

8/5/11 5:21:37 PM kernel FireWire GUID ffffffffffffffff is invalid! I have a Macbook Pro Core 2 Duo running Snow Leopard. Any suggestions?