Why does my Go program get a 'core dumped' error when executing?

In the process of developing using Go language, it is inevitable that you will encounter various errors. One of the common errors is "core dumped", and this error message may be confusing to some developers. This article explains the cause of this error and how to fix it.

1. The meaning of "core dumped"

In the Linux operating system, "core dumped" is an error message that indicates that a process unexpectedly exited during execution , and a so-called "core" file has been generated. This "core" file contains the memory image of the program when it is running, which can help developers debug when the program crashes.

If a "core dumped" error occurs in a Go program, just like other languages, it means that the program encountered an error during execution, causing the program to crash.

2. Causes of “core dumped”

Usually, “core dumped” errors occur under the following circumstances:

2.1. Memory leak

Memory leak is a common program error. It will cause the memory usage to continue to increase when the program is running, until the program crashes or is forcibly terminated by the operating system, resulting in a "core dumped" error. Therefore, when writing Go programs, you should pay attention to memory allocation and release.

2.2. Unhandled panic

When there is a problem running the program, the Go language will throw a panic exception. If this exception is not handled correctly, the program will crash, causing "core dumped" error. When writing a program, statements such as defer and recover should be used appropriately to correctly capture and handle panic exceptions.

2.3. Resource leaks

Similar to memory leaks, if other resources are used in the program and these resources are not released or closed correctly, it will also cause "core dumped" errors.

2.4. Code Error

There are syntax errors or logic errors in the program, which may also cause the "core dumped" error. At this time, you need to troubleshoot and solve the wrong error information.

3. How to solve the "core dumped" error

When a "core dumped" error occurs, you can troubleshoot and solve it through the following steps:

3.1 . Read the call stack

When the program crashes, the Go language will automatically generate a "core" file. By analyzing this file with tools such as GDB, you can obtain the call stack information when the program crashes. From this information, you can understand the approximate location of the program crash, so that you can debug and repair it in a targeted manner.

3.2. Check memory allocation and release

Memory leaks are a common cause of "core dumped" errors, so it is necessary to check and troubleshoot whether the memory allocation and release of the program are reasonable and whether there are any exceptions. .

3.3. Handling panic

If the "core dumped" error is caused by an unhandled panic, then relevant defer, recover and other statements need to be added to the program to correctly capture and process it Panic exception, terminate the program crash.

3.4. Check resource release

Similar to memory leaks, resource leaks in the program may also cause "core dumped" errors. At this time, you need to check whether the resources used by the program (such as files, database connections, etc.) are released correctly.

3.5. Solve code errors

If the "core dumped" error is caused by a code error, you need to troubleshoot and solve the error information related to the error and repair the code logic error.

4. Summary

The "core dumped" error is one of the common errors in Go language program development. It is usually caused by memory leaks, unhandled panics, and resource leaks. and code errors and other factors. When troubleshooting and solving "core dumped" errors, you need to comprehensively consider the above factors, adopt correct debugging and troubleshooting methods, and finally find and solve the problem.

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