[lyu07282]

The CPython API is such a dumpster fire, even writing very simple modules the reference counting is very difficult to do correctly. The majority of python modules written in C are probably leaking memory somewhere but nobody knows.

[amelius]

My problem is that debugging a segfault in a Python system is impossible because of all the noise generated by Python modules that never bothered to clean up their Valgrind output.

[badmintonbaseba]

Some tricks that worked for me in the past:

1. use rr for debugging your binary wheel, you can set up watchpoints, and reverse step/continue from the segfault.

2. compile and run your wheel with sanitizers (ASAN, UBSAN).

I rarely use valgrind so I can't comment on that.