Symbolicate mac app crash log

Where can I find the .dSYM file to symbolicate iOS crash logs?

please click for source The process attempted to execute an illegal or undefined instruction. The process may have attempted to jump to an invalid address via a misconfigured function pointer. Swift code on Intel processors will terminate with this exception type if an unexpected condition is encountered at runtime. See Trace Trap for details. The process was terminated at the request of another process with privileges to manage its lifetime.

Verifying your Symbols File

On iOS, keyboard extensions will be quit by the host app if they take too long to load. It's unlikely that the Backtraces shown in the crash report will point to the responsible code. Most likely, some other code along the startup path for the extension has taken a long time to complete but finished before the time limit, and execution moved onto the code shown in the Backtraces when the extension was quit.

You should profile the extension to better understand where most of the work during startup is occurring, and move that work to a background thread or defer it until later after the extension has loaded. The process was terminated at the request of the system. Look at the Termination Reason field to better understand the cause of the termination.

Debugging: symbolicating crash reports manually (stack trace, backtrace)

The Termination Reason field will contain a namespace followed by a code. The following codes are specific to watchOS:. The termination code 0xc51bad01 indicates that a watch app was terminated because it used too much CPU time while performing a background task. To address this issue, optimize the code performing the background task to be more CPU efficient, or decrease the amount of work that the app performs while running in the background.

The termination code 0xc51bad02 indicates that a watch app was terminated because it failed to complete a background task within the allocated time.

Xcode Tips - How to Find The Detailed Error Message For Your App Crash

To address this issue, decrease the amount of work that the app performs while running in the background. The termination code 0xc51bad03 indicates that a watch app failed to complete a background task within the allocated time, and the system was sufficiently busy overall that the app may not have received much CPU time with which to perform the background task. Although an app may be able to avoid the issue by reducing the amount of work it performs in the background task, 0xc51bad03 does not indicate that the app did anything wrong.

The process violated a guarded resource protection. This helps you quickly track down issues such as closing a file descriptor that had been opened by a system library. For example, if an app closes the file descriptor used to access the SQLite file backing a Core Data store, Core Data would then crash mysteriously much later on. The guard exception gets these problems noticed sooner, and thus makes them easier to debug. In crash reports from macOS or older versions of iOS, this information is encoded into the first Exception Code as a bitfield which breaks down as follows:.

The type of the guarded resource. A value of 0x2 indicates the resource is a file descriptor.

The guarded file descriptor that the process attempted to modify. The process exceeded a resource consumption limit. This is a notification from the OS that the process is using too many resources. The exact resource is listed in the Exception Subtype field. This may be a precursor to termination for excess memory usage. Typically, this is caused by thread-to-thread communication generally using peformSelector: Because the sort of communication that triggers this exception is happening so frequently, there will usually be multiple background threads with very similar Backtraces - indicating where the communication is originating.

Some crash reports may contain an un-named Exception Type , which will be printed as a hexadecimal value e. If you receive one of these crash reports, look directly to the Exception Codes field for more information. The exception code 0xbaaaaaad indicates that the log is a stackshot of the entire system, not a crash report. To take a stackshot, press the side button and both volume buttons simultaneously. Often these logs are accidentally created by users, and they do not indicate an error.

The exception code 0xbad indicates that a VoIP application has been terminated by iOS because it resumed too frequently. The exception code 0x8badf00d indicates that an application has been terminated by iOS because a watchdog timeout occurred.

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The application took too long to launch, terminate, or respond to system events. One common cause of this is doing synchronous networking on the main thread. Whatever operation is on Thread 0 needs to be moved to a background thread, or processed differently, so that it does not block the main thread. The exception code 0xcff indicates the app was killed by the operating system in response to a thermal event. This may be due to an issue with the particular device that this crash occurred on, or the environment it was operated in.

The exception code 0xdead10cc indicates that an application has been terminated by the OS because it held on to a file lock or sqlite database lock during suspension. If your application is performing operations on a locked file or sqlite database at suspension time, it must request additional background execution time to complete those operations and relinquish the lock before suspending.

The exception code 0x2bad45ec indicates that an application has been terminated by iOS due to a security violation. The termination description "Process detected doing insecure drawing while in secure mode" indicates the app tried to draw to the screen when not permitted to do so, such as when the screen is locked.

4 thoughts on “Debugging: symbolicating crash reports manually (stack trace, backtrace)”

atos -o -arch x86_64 -l . this link explains everything to symbolicate the crash log with the line no of. If Xcode is failing to fully symbolicate a crash report, your Mac is missing the dSYM file for the application.

Users may not notice this termination since the screen is off or the lock screen is displayed when this termination occurs. This section includes additional diagnostic information specific to the type of termination, which may include:. Application Specific Information: You should read this section to better understand the circumstances under which the process was terminated.

The most interesting part of a crash report is the backtrace for each of the process's threads at the time it terminated. Each of these traces is similar to what you would see when pausing the process with the debugger. The first line lists the thread number and the identifier of the currently executing dispatch queue. The remaining lines list details about the individual stack frames in the backtrace. From left to right:. The stack frame number. Stack frames are presented in calling order, where frame zero is the function that was executing at the time execution halted.

Frame one is the function that called the function in frame zero, and so on. For frame zero, the address of the machine instruction that was executing when execution halted. For the remaining stack frames, the address of the machine instruction that will next execute when control returns to the stack frame.

In a symbolicated crash report, the method name for the function in the stack frame. Exceptions in Objective-C are used to indicate programming errors detected at runtime such as accessing an array with an index that is out-of-bounds, attempts to mutate immutable objects, not implementing a required method of a protocol, or sending a message which the receiver does not recognize. If an exception is not caught, it is intercepted by a function called the uncaught exception handler.

The default uncaught exception handler logs the exception message to the device's console then terminates the process. Only the exception backtrace is written to the generated crash report under the Last Exception Backtrace section, as shown in Listing The exception message is omitted from the crash report.

If you receive a crash report with a Last Exception Backtrace you should acquire the console logs from the originating device to better understand the conditions which caused the exception. A crash log with a Last Exception Backtrace containing only hexadecimal addresses must be symbolicated to produce a usable backtrace as shown in Listing This exception was raised when loading a scene in the app's storyboard.

The corresponding IBOutlet for a connection to an element in the scene was missing. In a "zero-cost" system, every function has additional data that describes how to unwind the stack if an exception is thrown across the function. If an exception is thrown across a stack frame that has no unwind data then exception handling cannot proceed and the process halts. There might be an exception handler farther up the stack, but if there is no unwind data for a frame then there is no way to get there from the stack frame where the exception was thrown. Additionally, if you are including plain C code in your application or a library, you may need to specify the -funwind-tables flag to include unwind tables for all functions in that code.

This section lists the thread state of the crashed thread. This is a list of registers and their values at the time execution halted. Understanding the thread state is not necessary when reading a crash report but you may be able to use this information to better understand the conditions of the crash. The binary name or bundle identifier of the binary macOS only. A binary may contain multiple "slices", one for each architecture it supports. Only one of these slices is loaded into the process.

An UUID which uniquely identifies the binary image. This value changes with each build of the binary and is used to locate the corresponding dSYM file when symbolicating the crash report. When a low-memory condition is detected, the virtual memory system in iOS relies on the cooperation of applications to release memory.

Low-memory notifications are sent to all running applications and processes as a request to free up memory, hoping to reduce the amount of memory in use. If memory pressure still exists, the system may terminate background processes to ease memory pressure.

If enough memory can be freed up, your application will continue to run. If not, your application will be terminated by iOS because there isn't enough memory to satisfy the application's demands, and a low memory report will be generated and stored on the device. The format of a low memory report differs from other crash reports in that there are no backtraces for the application threads. A low memory report begins with a header similar to the Header of a crash report. Following the header are a collection of fields listing system-wide memory statistics.

Take note of the value for the Page Size field. The memory usage of each process in a low memory report is reported in terms of number of memory pages. The most important part of a low memory report is the table of processes. This table lists all running processes, including system daemons, at the time the low memory report was generated. If a process was "jettisoned", the reason will be listed under the [reason] column.

Acquiring Crash and Low Memory Reports

A process may be jettisoned for a number of reasons:. The process crossed its system-imposed memory limit. Per-process limits on resident memory are established by the system for all applications. Crossing this limit makes the process eligible for termination. The process was killed due to memory pressure. Look for a. When you see a low memory crash, rather than be concerned about what part of your code was executing at the time of termination, you should investigate your memory usage patterns and your responses to low memory warnings.

Locating Memory Issues in Your App lists detailed steps on how to use the Leaks Instrument to discover memory leaks, and how to use the Allocations Instrument's Mark Heap feature to avoid abandoned memory. Memory Usage Performance Guidelines discusses the proper ways to respond to low-memory notifications as well as many tips for using memory effectively. For information about how to use the Instruments Zombies template to fix memory overrelease crashes, see Eradicating Zombies with the Zombies Trace Template.

For more information about application archiving, refer to the the App Distribution Guide. Also added a description of the exception code 0x2bad45ec. Clarified that crash reports need to be named with a. Removed the discussion of the 0xdeadfa11 exception code force quitting an app no longer generates a crash report. Added information about some termination codes specific to watchOS apps.

Added stronger emphasis about the need to save not only. Updated to include a workaround for an issue that prevents application code from being symbolicated. New document that essential information for developers explaining how to symbolicate, understand, and interpret crash reports. All Rights Reserved. Terms of Use Privacy Policy Updated: Documentation Archive Developer Search. Acquiring Crash and Low Memory Reports.

Symbolicating Crash Reports Bitcode. Determining Whether a Crash Report is Symbolicated. Symbolicating Crash Reports With atos. Symbolication Troubleshooting. Analyzing Crash Reports Header. Exception Information. Additional Diagnostic Information. Thread State.

Binary Images. Understanding Low Memory Reports. Related Documents. Document Revision History. TheElements [] Path: TheElements Version: ARM Native Role: Foreground Parent Process: Exception Type: Segmentation fault: Dyld Error Message: Dyld Message: Library not loaded: TheElements failed to scene-create after Thread 0 name: Dispatch queue: Last Exception Backtrace: Binary Images: Otherwise, find which thread crashed there will be a section that says Thread X Crashed , where X is a number.

Find the first address that happened within your app For example, if you have an Application Specific Backtrace , it may look something like:. In this case, 0xafb2f1b looks interesting. If all you have is a thread that crashed, it might look like this instead:. Run atos to get information about that address. Your command will look something like:. The output should look something like:.

If this isn't enough information for you, try poking around at different addresses earlier in the stack trace from your crash log. Thx a lot! Apple's Technical Note TN and the atos man page are helpful to read. You can optionally use a file separated by whitespace with the list of addresses you copy from the. My crash log is like this: Skip to content. Sign up for a GitHub account Sign in. Instantly share code, notes, and snippets.

Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. Code Revisions 1 Stars 29 Forks 8. How to symbolize OSX crash logs. Find your dSYM file. Assuming you are using xcode's archive functionality, open the Organizer window from the Window menu.

Symbolicating OS X Crash Logs

Click the Archives tab. Right click on the appropriate build and select Show in Finder. When Finder opens, right click on the selected archive and select Show Package Contents. Then navigate to Products , then Applications , and copy the app file to the same temporary directory. Navigate to your temporary directory in the Terminal app. Check to make sure you have the right build. Output should look like: The line will look something like: MyApp 1.