When an app on your Mac is behaving in an unexpected way, our Support Humans may ask you to send along a Console Log. The log may tell us exactly what is going on behind the scenes and help us resolve the issue. Using the Console on macOS Sierra and later. Open the Console application (from the Utilities folder inside your Applications folder). In macOS Mojave, I have tried the defaults command along with disabling automatic login and have the blank user/password field option enabled, but typing in “console” as the user name is accepted as any other user login, password of admin entered, and does not go to a console login. Console app has them neatly arranged depending on if a system level process has crashed or a user level process. From there you can see if it's in /Library/Logs or /Library/Logs - you will get crashes and panics and hangs in separate files. Don't forget to look in /private/var/log as well.
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Console User Guide
The tool is only for macOS and Linux at this time (support for Windows is coming soon) The tool is semi-tethered, which means you’ll need a computer to boot jailbroken if you power off The tool supports 64-bit A5-A11 devices from the iPhone 5s to the iPhone X with the exception of a few: iPad Air 2, iPad (5 th generation), and iPad Pro (1 st.
Use Console to view log messages collected by your computer and other connected devices. These log messages may deal with system events, dialog text, errors, status, and other communications. If a problem occurs, you may be able to find information about the cause of the problem by viewing either log messages or activities.
Note: If you’re not logged in as an administrator, you need to enter an administrator name and password to view log messages.
In the Console app on your Mac, in the Devices list on the left, select the device you want to view log messages for (such as your Mac, iPhone, iPad, Apple Watch, or Apple TV). If you don’t see the Devices list, click the Sidebar button in the Favorites bar.
The log messages for the device appear in the window to the right.
The type of log message is indicated by a colored dot in the Type column:
Red : Faults
Yellow : Errors
Dark gray : Debug log messages
Light gray : Info log messages
Note: If there is no colored dot in the Type column, the log message is the default type.
Do any of the following:
View an entire log message in the Messages column: Click the log message, then press the Right Arrow key, or choose View > Expand Selected Row. To shorten the log message to one line again, press the Left Arrow key, or choose View > Collapse Selected Row.
View all details of a log message: Click Details in the log message details in the lower half of the Console window. If you don’t see the log message details, click the Info button in the toolbar (or use the Touch Bar), or choose View > Show Info Pane. To see fewer details, click Hide.
Search for a specific log message in the current view: Click the log message, then press Command-F. See Find text in log messages and reports.
While viewing log messages, you can move columns and change which columns appear; view the most recent activity; and apply saved searches. See Customize the log window.
This article’s focus is on macOS crash reports. More specifically this article explains how you can (1) locate crash logs (2) and read them to diagnose a crash.
Your Mac can crash, rarely. These crashes usually mean nothing important, if it is rare. Thus it is not something you should worry about. In most cases, restarting your Mac will resolve the issue. Your Mac will automatically reboot itself.
However, if your Mac is crashing frequently, you may want to find our why these crashes occur so that you can prevent them from happening again. And the most important thing you should do is to find more specific error details.
In this article we are going to take a look at using the crash logs that your system generate. These logs will help you identify what’s causing the crash.
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Where to find crash reports
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There are two ways to access your crash reports. You can use any of the methods:
- You can use the Console app. The Console app included with your Mac. You can open this app by going to Applications > Utilities > Console. You can also use Spotlight to access Console. Select your Device and click Crash reports under the ‘reports’ section.
- You can also find your crash reports in ~/Library/Logs/DiagnosticReports/. Here is how you can access there:
- Go to Finder
- Now press the Option key and then click Go (while you are pressing the Option key)
- Click Library
- Click the Logs folder
- Click the DiagnosticReports folder
- And open the file that says “Crash”
See also: Restart your Mac in Safe Mode
How to read macOS crash reports
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Understaing these reports can be difficult as they are usually big. Here is how you can decipther a crash report:
1. The first section of a crash report includes what process crashed. Something like this:
In this case, said process is WebKit (Safari).
2. The next section of a crash report includes date/time and operating system, like this:
3. The next section includes more crash details (The Exception), something like this:
There are four common exeption types, according to Apple:
EXC_BAD_ACCESS/KERN_INVALID_ADDRESS — This is caused by the thread accessing unmapped memory. It may be triggered by either a data access or an instruction fetch; the Thread State section describes how to tell the difference.
EXC_BAD_ACCESS/KERN_PROTECTION_FAILURE — This is caused by the thread trying to write to read-only memory. This is always caused by a data access.
EXC_BAD_INSTRUCTION — This is caused by the thread executing an illegal instruction.
EXC_ARITHMETIC/EXC_I386_DIV — This is caused by the thread doing an integer divide by zero on an Intel-based computer.
The next section includes backtrace information. There can be one or multiple threads. In reverse chronological order, each thread shows the series of events .
To understand this section, find the thread that crashed. You can easily find that, because the report will say something like this: Thread (thread number) Crashed. This section explains what lead to the crash.
Like this:
There are four columns here:
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- The first one is the frame number (reverse chronological), like 0, 1, 2, 3….
- The second one is the name of the program or other process that performed the task. In this instance, com.apple.WebKit.
- The third column is the counter program address.
- The fourth column is the task.
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From this example, we know that, for example, “com.apple.WebCore 0x00007fff3e26977a WebCore::HTMLMediaElement::mediaCanStart(WebCore::Document&) + 90” is responsible for the crash.
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Now you know what caused the crash and series of events triggered the crash. This will help you idendify the problem and then address it appropriately.
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If your problem is a third-party app, you may want to contact its developer. Tell them your problem and you may want to send a copy of this crash log. You can click the share icon in the Console app to send the report.
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See also: