I'm working with TVM, a deep learning compiler. In my workflow, it is useful to be able to use import pdb; pdb.set_trace(), and drop into the debugger. However, pdb.set_trace() causes a segfault anytime after TVM has been imported.
My current setup is - Ubuntu 16.04 (running on Windows Subsystem for Linux, but this happens on my native 16.04 machine too!) - Python 3.6
This problem does not occur on Windows or Mac.
This problem only occurs when running a script from the commandline (i.e. python3 minimum-reproducible-example.py), not when running from the python3 repl.
I've done some debugging with gdb, and narrowed it down: the error occurs when the readline package is imported.
Minimum reproducible example:
import tvm
import readline
After debugging with gdb, I traced it to a specific line in cpython:
Program received signal SIGSEGV, Segmentation fault.
PyModule_GetState (m=0x0) at Objects/moduleobject.c:558
558 if (!PyModule_Check(m)) {
In this case, m is 0x0, which the function doesn't seem to expect.
If anyone could even just point me towards more useful ways to debug this, that would be helpful!