[llvm-bugs] [Bug 39559] Segmentation fault when running check-clang-python with UBSan

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39559

Vince Bridgers <vince.a.bridgers at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |vince.a.bridgers at gmail.com
         Resolution|---                         |WORKSFORME

--- Comment #1 from Vince Bridgers <vince.a.bridgers at gmail.com> ---
I looked into this, and am not able to repro under currently documented build
environment. I was able to repro under very particular build/run environments,
so I suspect David encountered one or the other issue that leads to this
segfault. This problem can occur due to 1 of the following reasons:

1) LLVM compiler built with LLVM_ENABLE_PIC=on. There was a patch created to
disable Python bindings under these conditions at some point. Perhaps this was
the problem at the time. 
2) Perhaps a problem with the Python version used - I'm guessing this was the
problem in the original report.

This problem has been reported a few times, and there have been different
approaches to addressing this. If a reader comes across this issue looking for
a solution, please look at those and also check out the following references. 

References … 

Python binding tests disabled when LLVM_ENABLE_PIC=OFF
https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20190114/257720.html 

Appears to be caused by a regression in Python. See
https://bugs.python.org/issue37140

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