Segmentation Fault 11 [Meaning, causes & how to fix]

July 2024 · 3 minute read
segmentation fault 11

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    • C is one of the most used programming languages but sometimes while developing new software you might encounter Segmentation fault 11 error.

    This error will cause your application to crash, and in today’s article, we’re going to show you what this error means and how to fix it once and for all.

    How can I fix Segmentation fault: 11?

    What does Segmentation fault 11 mean/ What is Segmentation fault 11 C++?

    When Segmentation fault 11 occurs, it means that a program has attempted to access a memory location that it’s not allowed to access.

    The error can also occur if the application tries to access memory in a method that isn’t allowed.

    How to debug Segmentation fault 11?

    1. Compile the code and use gdb

  • Run the following command:
    gcc program.c -g
  • Now use the gdb like this:

    • $ gdb ./a.out

    (gdb) run

    (gdb) backtrace

    In addition, users are also recommending to run these two commands:

    lldb executable_name

    run -flag1 -flag2

    2. Inspect your code

  • Double-check your code
  • Make sure that there aren’t any declarations that might be using too much memory.

    • This is also a useful tip if you’re getting Segmentation fault: 11 while using Python.

    3. Use the malloc command

  • Use the malloc command properly.
  • Of course, always use the following command to free the memory:

    • free()

    4. Use the char var/int arr command

    In your code, use the following command:

    char var[strlen(x)+1]

    int arr[(sizeof(x)/sizeof(x[0]) +1)]

    Use one of these commands depending on your needs.

    5. Other general tips

  • Make sure that your global variables have assigned values.
  • Separate your code into different files for easier debugging.

    • Segmentation fault 11 Python

    1. Uninstall Shapely

    On your Mac, run the following command:

    pip uninstall shapely; pip install --no-binary :all: shapely

    Keep in mind that this method might only work if you’re trying to install Cartopy.

    2. Use the Terminal

  • Start the Terminal from the Applications > Utilities directory.
    terminal open segmentation fault: 11
  • Once the Terminal starts, run the following commands:

    • cd /Library/Frameworks/Python.framework/Versions/3.3

    cd ./lib/python3.3/lib-dynload

    sudo mv readline.so readline.so.disabled

    Segmentation fault 11 is usually caused by memory allocation issues, and if you’re having this problem, be sure to try some of the solutions mentioned above.

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