What causes a Python segmentation fault?

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This happens when a python extension (written in C) tries to access a memory beyond reach.

You can trace it in following ways.

  • Add sys.settrace at the very first line of the code.

  • Use gdb as described by Mark in this answer.. At the command prompt

    gdb python
(gdb) run /path/to/script.py
## wait for segfault ##
(gdb) backtrace
## stack trace of the c code

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