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CI: Debug CI ImportError #47310

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rhshadrach
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  • closes #xxxx (Replace xxxx with the Github issue number)
  • Tests added and passed if fixing a bug or adding a new feature
  • All code checks passed.
  • Added type annotations to new arguments/methods/functions.
  • Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

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Last build of Docstrings and typing validation failed but ASV Benchmarks was successful.

Good build:

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                 U __vsnprintf_chk@GLIBC_2.3.4
000000000005b438 T _fini
000000000000d000 T _init
000000000005b4[30](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:9:31) T char_to_string
                 U free@GLIBC_2.2.5
                 U malloc@GLIBC_2.2.5
                 U memcmp@GLIBC_2.2.5
                 U memcpy@GLIBC_2.2.5
                 U memset@GLIBC_2.2.5
                 U pandas_datetime_to_datetimestruct
                 U strlen@GLIBC_2.2.5

@rhshadrach rhshadrach mentioned this pull request Jun 11, 2022
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@rhshadrach rhshadrach closed this Jun 11, 2022
@WillAyd
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WillAyd commented Aug 30, 2022 •
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@rhshadrach great debugging on this. I think the main thing of importance here is the symbol table for timestamps.so Your good build has

0000000000018[39](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:40)0 T pandas_datetime_to_datetimestruct

Whereas the bad build has

                 U pandas_datetime_to_datetimestruct

The "T" vs "U" distinction here is important; man nm offers some good insights but looks like the former build has the symbol in the text table of the shared library whereas the latter has it as undefined.

"U" occurs when you try to link object files (.o on Unix) but the symbol you want placed into the shared library (.so) is not found in any of the .o files.

My guess here is that we have a race condition between the linking stage looking for np_datetime.o and the compilation phase of another process which may be generating this file. Unlike tools like CMake and Meson, it doesn't appear like setuptools isolates the generation of the np_datetime.o file to each library it is building, instead continually writing to build/temp.linux-x86_64-cpython-38/pandas/_libs/tslibs/np_datetime.o

With all of that said, I don't know what the immediate fix could be for setuptools. Life is definitely much easier in the CMake / Meson world with this. We could certainly re-examine the build toolchain in setup.py as is and make sure that files that re-generate np_datetime.o truly need to to mitigate the risk of a race condition, but AFAIK I don't think this is truly resolvable with setuptools

@mroeschke @lithomas1

@rhshadrach rhshadrach deleted the debug_ci branch September 10, 2022 16:49
@mroeschke mroeschke mentioned this pull request Sep 12, 2022
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@rhshadrach @WillAyd