Kernel Error Mac
Contents |
your Mac may do one or more of the following: spontaneously restart, become unresponsive, turn off, display a message "Your computer restarted because of a problem." or display a message "You shut down your computer because of a problem." About unexpected restartsIn kernel panic mac el capitan rare instances, OS X may encounter an unrecoverable issue affecting all open apps.When this happens,
Kernel Panic Mac Won't Boot
your Mac must be restarted. This is sometimes due to what is known as a "kernel panic" because an underlying part of the operating kernel panic el capitan system (the "kernel") has determined there is an issue that requires a restart. If your computer experiences a kernel panic, a message may appear for a few seconds explaining that the computer has been restarted: "Your computer restarted because
Kernel Panic Linux
of a problem. Press a key or wait a few seconds to continue starting up." After a moment, the computer continues starting up. Preventing unexpected restartsIn most cases, kernel panics are not caused by an issue with the Mac itself. They are usually caused by software that was installed, or a problem with connected hardware. To help avoid kernel panics,install all available software updatesuntil Software Updatereports, "Your software is up to date." OS X updates help your Mac handle kernel panic android the kinds of issues that can cause kernel panics, such as malformed network packets, or third party software issues. For most kernel panics, updating your software is all you have to do. After your computer restartsOnce your Mac restarts successfully, an alert message appears, "You shut down your computer because of a problem." Click Open to re-open any apps that were active before you restarted. If you believe the issue may have been caused by one of the apps that you were using, click Cancel instead. If you don't click anything for 60 seconds, OS X automatically continues as if you had clicked Open. Note:If your computer is unable to recover from the issue, it may restart repeatedly, and then shut down. If this happens, or if you see the "computer restarted because of a problem" message frequently, see theAdditional Informationsection of this article for guidance. Reporting the issue to AppleOnce you log in, OS X lets you know that, "Your computer was restarted because of a problem." Click "Report…" if you want to see details related to the issue. You can also send these details to Apple. Sending these reports helps Apple to investigate the kinds of issues that cause panics to occur. Viewing the report may also provide additional clues as to what caused the issue. Note:If you find the term "machine check" in the "Problem Details and System Configuration" field of this
Resources Macs MacBooks Mac Desktops iPhones Blogs iPads Accessories Apps Audio Business Cameras Components Development software Displays E-readers Home Theater iOS iPhone Accessories iPad Accessories iPods OS X Printers Networking Productivity Software Smartwatches
Kernel Panic Mr Robot
Storage Styluses Mac 911 Mac Gems MacOS Hints Mac 101 Working Mac Get more
Your Computer Restarted Because Of A Problem Mac
out of your Mac with productivity tips and tricks Follow @macworldbiz Home OS X How to troubleshoot a kernel panic mac your computer restarted because of a problem loop Comments Joe Kissell | @joekissell Senior Contributor, Macworld Feb 6, 2013 3:30 AM Most crashes on a Mac affect just one application. But you may encounter a type of system-wide crash that brings down https://support.apple.com/en-us/HT200553 your entire Mac: a kernel panic. When this occurs, there’s no warning and no way to save your work or do anything else without restarting. And, because kernel panics can have many different causes, diagnosing the problem and preventing its recurrence are difficult. How do you know if it’s a kernel panic? If you’re running OS X 10.7 Lion or earlier, kernel panics usually result in your http://www.macworld.com/article/2027201/how-to-troubleshoot-a-kernel-panic.html screen dimming from top to bottom, and a message appearing in several languages telling you that you must restart your Mac (by holding down the power button for several seconds to turn it off, and then pressing it again to turn it back on). Up through Lion, a kernel panic looked like this (on an otherwise unresponsive screen). Starting in OS X 10.8 Mountain Lion, OS X automatically restarts when you have a kernel panic, and then displays a similar-looking message for 60 seconds (or until you press a key) telling you that your Mac was restarted because of a problem. (If the kernel panic repeats every time your Mac restarts, OS X will give up after five tries and shut your Mac down.) As Apple notes on its support page about kernel panics, something as random and fleeting as malformed network packets can potentially cause a kernel panic. So, if you experience this problem just once, or only rarely, just restart, get back to work, and forget about it. In Mountain Lion, OS X restarts automatically on a kernel panic and then lets you know what happened. But if you see a kernel panic frequently (Apple apparently defines “frequently” a
an action taken by an operating system upon detecting an internal fatal error from which it cannot safely recover. The term is largely specific to Unix and Unix-like systems; https://en.wikipedia.org/wiki/Kernel_panic for Microsoft Windows operating systems the equivalent term is "Stop error" (resulting in http://www.thexlab.com/faqs/kernelpanics.html a "Stop error screen," or colloquially, a "Blue Screen of Death"). The kernel routines that handle panics, known as panic() in AT&T-derived and BSD Unix source code, are generally designed to output an error message to the console, dump an image of kernel memory to disk for post-mortem debugging, and then either kernel panic wait for the system to be manually rebooted, or initiate an automatic reboot.[2] The information provided is of a highly technical nature and aims to assist a system administrator or software developer in diagnosing the problem. Kernel panics can also be caused by errors originating outside of kernel space. For example, many Unix OSes panic if the init process, which runs in userspace, terminates.[3][4] Contents 1 kernel panic mac History 2 Causes 3 Operating system specifics 3.1 Linux 3.2 OS X 4 See also 5 References History[edit] The Unix kernel maintains internal consistency and runtime correctness with assertions as the fault detection mechanism. The basic assumption is that the hardware and the software should perform correctly and a failure of an assertion results in a panic, i.e. a voluntary halt to all system activity.[5] The kernel panic was introduced in an early version of Unix and demonstrated a major difference between the design philosophies of Unix and its predecessor Multics. Multics developer Tom van Vleck recalls a discussion of this change with Unix developer Dennis Ritchie: I remarked to Dennis that easily half the code I was writing in Multics was error recovery code. He said, "We left all that stuff out. If there's an error, we have this routine called panic, and when it is called, the machine crashes, and you holler down the hall, 'Hey, reboot it.'"[6] The original panic() function was essentially unchanged from Fifth Edition UNIX to the VAX-based UNIX 32V and output only an error message with no other information, then dropped the system into an endless idle loop. S
set of procedures which should resolve most kernel panics. Additional information, including how to use and interpret panic logs for troubleshooting, can be found in the "Kernel Panics" chapter of Troubleshooting Mac OS X. Before you begin... The procedures defined herein constitute a testing road map and should be followed in the order specified. Read this FAQ thoroughly before proceeding in order to familiarize yourself with the steps and assure you have the necessary resources available. WARNING: Some of the testing procedures defined herein may require that you: Connect and disconnect peripheral devices. Work inside your computer. Follow all safety instructions specified in the Apple manual which accompanied your Mac. In particular: Shut down your Mac and disconnect external power before working inside your Mac. Where feasible, remove the battery before working inside a laptop or portable computer. Consult the manual that shipped with your Mac for all safety procedures. Always follow all Apple-recommended safety procedures without fail. Causes of kernel panics General causes of kernel panics Kernel panics are often caused by one or more of the following issues. Defective or incompatible RAM often causes of kernel panics. Despite being a highly-reliable product, RAM can fail. Modern operating systems, like Mac OS X, are sensitive to RAM. Purchase additional RAM from either Apple or third parties who guarantee their RAM is compatible with Mac OS X, offer a liberal exchange policy, and provide a lifetime warranty should the RAM become defective or a later version of Mac OS X introduce incompatibilities. Incompatible, obsolete, or corrupted kernel extensions. If a third-party kernel extension or one of its dependencies is incompatible or obsolete with respect to the version of Mac OS X you are using, kernel panics may occur when the kernel executes such extensions. Likewise, if a kernel extension or one of its dependencies is corrupted, such as the result of hard disk corruption, kernel panics are likely to occur when the kernel attempts to load or execute such. Incompatible, obsolete, or corrupted drivers. Similar to kernel extensions, drivers for t