# Plea for segfault assistance in PythonCall.jl

**URL:** <https://discourse.julialang.org/t/plea-for-segfault-assistance-in-pythoncall-jl/130697>\
**Category:** General Usage\
**Tags:** question\
**Created:** [July 14, 2025, 11:02am UTC](https://discourse.julialang.org/t/plea-for-segfault-assistance-in-pythoncall-jl/130697 "2025-07-14T11:02:45Z")\
**Posts on this page:** 1\
**Showing post:** 27

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**Author:** ![cjdoris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cjdoris/32/213133_2.png) [@cjdoris](https://discourse.julialang.org/u/cjdoris)\
**Post date:** [July 14, 2025, 7:21pm UTC](https://discourse.julialang.org/t/plea-for-segfault-assistance-in-pythoncall-jl/130697/27 "2025-07-14T19:21:31Z")

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Ok I just looked in the history and `tp_versions_used` was indeed added in 3.13 and the other missing field `tp_watched` was added in 3.12.

That explains why we had seen it occasionally before on 3.12 but only a lot more recently on 3.13, since it’ll be reaching further beyond the end of the struct and so more likely to cause memory corruption.

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