CI: Debug CI ImportError
- [ ] closes #xxxx (Replace xxxx with the Github issue number)
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) 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.

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

Good build:

<details>
<summary>Symbols in np_datetime.o</summary>

```
build/temp.linux-x86_64-cpython-38/pandas/_libs/tslibs/src/datetime/np_datetime.o:     file format elf64-x86-64
SYMBOL TABLE:
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```
</details>

<details>
<summary>Symbols in np_datetime.so</summary>

```
Run nm -gD pandas/_libs/tslibs/np_datetime.cpython-38-x86_64-linux-gnu.so
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                 U PyEval_EvalFrameEx
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                 U PyImport_GetModuleDict
                 U PyImport_ImportModule
                 U PyImport_ImportModuleLevelObject
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```
</details>

<details>
<summary>Symbols in timestamps.so</summary>

```
Run nm -gD pandas/_libs/tslibs/timestamps.cpython-38-x86_64-linux-gnu.so
                 U PyArg_UnpackTuple
                 U PyBaseObject_Type
                 U PyBool_Type
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                 U PyBytes_Type
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                 U PyCFunction_Type
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                 U PyCapsule_Import
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                 U PyCapsule_Type
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                 U PyCode_New
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                 U PyDict_GetItemString
                 U PyDict_GetItemWithError
                 U PyDict_New
                 U PyDict_Next
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                 U PyDict_SetItemString
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                 U PyEval_EvalFrameEx
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                 U PyExc_AttributeError
                 U PyExc_BufferError
                 U PyExc_DeprecationWarning
                 U PyExc_Exception
                 U PyExc_GeneratorExit
                 U PyExc_ImportError
                 U PyExc_IndexError
                 U PyExc_NameError
                 U PyExc_NotImplementedError
                 U PyExc_OverflowError
                 U PyExc_RuntimeError
                 U PyExc_RuntimeWarning
                 U PyExc_StopIteration
                 U PyExc_SystemError
                 U PyExc_TypeError
                 U PyExc_UnboundLocalError
                 U PyExc_ValueError
                 U PyExc_ZeroDivisionError
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                 U PyException_SetTraceback
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                 U PyFloat_Type
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                 w __gmon_start__
0000000000083ae0 B __pyx_module_is_main_pandas___libs__tslibs__timestamps
                 U __stack_chk_fail@GLIBC_2.4
                 U __vsnprintf_chk@GLIBC_2.3.4
000000000005e128 T _fini
000000000000e000 T _init
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000000000005e120 T char_to_string
0000000000017c70 T cmp_npy_datetimestruct
0000000000017dd0 T convert_pydatetime_to_datetimestruct
000000000005f1a0 R days_per_month_table
0000000000018370 T extract_unit
0000000000017d40 T extract_utc_offset
                 U free@GLIBC_2.2.5
000000000001[9](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:10)0e0 T get_datetime_metadata_from_dtype
00000000000[17](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:18)ac0 T get_datetimestruct_days
0000000000017400 T is_leapyear
                 U malloc@GLIBC_2.2.5
                 U memcmp@GLIBC_2.2.5
                 U memcpy@GLIBC_2.2.5
                 U memset@GLIBC_2.2.5
00000000000[18](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:19)070 T npy_datetimestruct_to_datetime
0000000000018[39](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:40)0 T pandas_datetime_to_datetimestruct
000000000001[87](https://github.com/pandas-dev/pandas/runs/6844281121?check_suite_focus=true#step:9:88)c0 T pandas_timedelta_to_timedeltastruct
                 U strlen@GLIBC_2.2.5
```
</details>

Bad build:

<details>
<summary>Symbols in np_datetime.o</summary>

```
Run objdump -t build/temp.linux-x86_64-cpython-38/pandas/_libs/tslibs/src/datetime/np_datetime.o
build/temp.linux-x[8](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:9)6_64-cpython-38/pandas/_libs/tslibs/src/datetime/np_datetime.o:     file format elf64-x86-64
SYMBOL TABLE:
0000000000000000 l    df *ABS*	0000000000000000 np_datetime.c
0000000000000000 l    d  .text.is_leapyear	0000000000000000 .text.is_leapyear
0000000000000000 l    d  .text.set_datetimestruct_days	0000000000000000 .text.set_datetimestruct_days
0000000000000000 l     F .text.set_datetimestruct_days	000000000000018f set_datetimestruct_days
0000000000000000 l    d  .text.add_minutes_to_datetimestruct	0000000000000000 .text.add_minutes_to_datetimestruct
0000000000000000 l    d  .text.get_datetimestruct_days	0000000000000000 .text.get_datetimestruct_days
0000000000000000 l    d  .text.add_seconds_to_datetimestruct	0000000000000000 .text.add_seconds_to_datetimestruct
0000000000000000 l    d  .text.cmp_npy_datetimestruct	0000000000000000 .text.cmp_npy_datetimestruct
0000000000000000 l    d  .text.extract_utc_offset	0000000000000000 .text.extract_utc_offset
0000000000000000 l    d  .text.convert_pydatetime_to_datetimestruct	0000000000000000 .text.convert_pydatetime_to_datetimestruct
0000000000000000 l    d  .text.npy_datetimestruct_to_datetime	0000000000000000 .text.npy_datetimestruct_to_datetime
0000000000000000 l    d  .rodata	0000000000000000 .rodata
0000000000000000 l    d  .text.extract_unit	0000000000000000 .text.extract_unit
0000000000000000 l    d  .text.pandas_datetime_to_datetimestruct	0000000000000000 .text.pandas_datetime_to_datetimestruct
0000000000000000 l    d  .text.pandas_timedelta_to_timedeltastruct	0000000000000000 .text.pandas_timedelta_to_timedeltastruct
0000000000000000 l    d  .text.get_datetime_metadata_from_dtype	0000000000000000 .text.get_datetime_metadata_from_dtype
0000000000000000 l       .rodata.cst16	0000000000000000 .LC0
0000000000000020 l       .rodata.cst16	0000000000000000 .LC2
0000000000000010 l       .rodata.cst16	0000000000000000 .LC1
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00000000000000b0 l       .rodata.cst16	0000000000000000 .LC11
00000000000000c0 l       .rodata.cst16	0000000000000000 .LC12
00000000000000d0 l       .rodata.cst16	0000000000000000 .LC13
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0000000000000070 l       .rodata.cst16	0000000000000000 .LC7
0000000000000060 l       .rodata.cst16	0000000000000000 .LC6
00000000000000a0 l       .rodata.cst16	0000000000000000 .LC10
00000000000000f0 l       .rodata.cst16	0000000000000000 .LC15
0000000000000100 l       .rodata.cst16	0000000000000000 .LC16
0000000000000050 l       .rodata.cst16	0000000000000000 .LC5
0000000000000080 l       .rodata.cst16	0000000000000000 .LC8
00000000000000[9](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:10)0 l       .rodata.cst16	0000000000000000 .LC9
0000000000000000 l       .rodata.str1.1	0000000000000000 .LC17
0000000000000007 l       .rodata.str1.1	0000000000000000 .LC18
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0000000000000000 l       .rodata.cst8	0000000000000000 .LC20
0000000000000013 l       .rodata.str1.1	0000000000000000 .LC21
0000000000000018 l       .rodata.str1.1	0000000000000000 .LC22
000000000000001e l       .rodata.str1.1	0000000000000000 .LC23
0000000000000022 l       .rodata.str1.1	0000000000000000 .LC24
0000000000000027 l       .rodata.str1.1	0000000000000000 .LC25
000000000000002e l       .rodata.str1.1	0000000000000000 .LC26
0000000000000035 l       .rodata.str1.1	0000000000000000 .LC27
0000000000000041 l       .rodata.str1.1	0000000000000000 .LC28
0000000000000042 l       .rodata.str1.1	0000000000000000 .LC29
0000000000000000 l       .rodata.str1.8	0000000000000000 .LC30
0000000000000030 l       .rodata.str1.8	0000000000000000 .LC32
00000000000001[10](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:11) l       .rodata.cst16	0000000000000000 .LC31
0000000000000070 l       .rodata.str1.8	0000000000000000 .LC33
0000000000000000 g     F .text.is_leapyear	0000000000000071 is_leapyear
0000000000000000         *UND*	0000000000000000 _GLOBAL_OFFSET_TABLE_
00000000000000a0 g     O .rodata	0000000000000060 days_per_month_table
0000000000000000 g     F .text.add_minutes_to_datetimestruct	00000000000004a8 add_minutes_to_datetimestruct
0000000000000000 g     F .text.get_datetimestruct_days	00000000000001a9 get_datetimestruct_days
0000000000000000 g     F .text.add_seconds_to_datetimestruct	000000000000008f .hidden add_seconds_to_datetimestruct
0000000000000000 g     F .text.cmp_npy_datetimestruct	00000000000000ca cmp_npy_datetimestruct
0000000000000000 g     F .text.extract_utc_offset	0000000000000085 extract_utc_offset
0000000000000000         *UND*	0000000000000000 PyObject_GetAttrString
0000000000000000         *UND*	0000000000000000 _Py_NoneStruct
0000000000000000         *UND*	0000000000000000 PyObject_CallMethod
0000000000000000         *UND*	0000000000000000 _Py_Dealloc
0000000000000000 g     F .text.convert_pydatetime_to_datetimestruct	000000000000029c convert_pydatetime_to_datetimestruct
0000000000000000         *UND*	0000000000000000 PyLong_AsLong
0000000000000000         *UND*	0000000000000000 PyObject_HasAttrString
0000000000000000         *UND*	0000000000000000 PyNumber_Long
0000000000000000         *UND*	0000000000000000 PyErr_Occurred
0000000000000000 g     F .text.npy_datetimestruct_to_datetime	00000000000002f3 npy_datetimestruct_to_datetime
0000000000000000         *UND*	0000000000000000 PyExc_ValueError
0000000000000000         *UND*	0000000000000000 PyErr_SetString
0000000000000000 g     F .text.extract_unit	0000000000000017 extract_unit
0000000000000000 g     F .text.pandas_datetime_to_datetimestruct	000000000000042f pandas_datetime_to_datetimestruct
0000000000000000         *UND*	0000000000000000 PyExc_RuntimeError
0000000000000000 g     F .text.pandas_timedelta_to_timedeltastruct	0000000000000915 pandas_timedelta_to_timedeltastruct
0000000000000000 g     F .text.get_datetime_metadata_from_dtype	0000000000000009 get_datetime_metadata_from_dtype
0000000000000100 g     O .rodata	0000000000000028 _M_MAX_DTS
0000000000000[14](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:15)0 g     O .rodata	0000000000000028 _S_MAX_DTS
0000000000000[18](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:19)0 g     O .rodata	0000000000000028 _MS_MAX_DTS
00000000000001c0 g     O .rodata	0000000000000028 _US_MAX_DTS
0000000000000[20](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:21)0 g     O .rodata	0000000000000028 _NS_MAX_DTS
0000000000000[24](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:25)0 g     O .rodata	00000000000000[28](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:29) _PS_MAX_DTS
0000000000000280 g     O .rodata	0000000000000028 _FS_MAX_DTS
00000000000002c0 g     O .rodata	0000000000000028 _AS_MAX_DTS
0000000000000[30](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:31)0 g     O .rodata	0000000000000028 _M_MIN_DTS
0000000000000[34](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:35)0 g     O .rodata	0000000000000028 _S_MIN_DTS
0000000000000[38](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:39)0 g     O .rodata	0000000000000028 _MS_MIN_DTS
00000000000003c0 g     O .rodata	0000000000000028 _US_MIN_DTS
0000000000000[40](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:41)0 g     O .rodata	0000000000000028 _NS_MIN_DTS
0000000000000[44](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:45)0 g     O .rodata	0000000000000028 _PS_MIN_DTS
0000000000000[48](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:7:49)0 g     O .rodata	0000000000000028 _FS_MIN_DTS
00000000000004c0 g     O .rodata	0000000000000028 _AS_MIN_DTS
```
</details>

<details>
<summary>Symbols in np_datetime.so</summary>

```
Run nm -gD pandas/_libs/tslibs/np_datetime.cpython-38-x86_64-linux-gnu.so
                 U PyBaseObject_Type
                 U PyBytes_FromStringAndSize
                 U PyCFunction_NewEx
                 U PyCFunction_Type
                 U PyCapsule_GetPointer
                 U PyCapsule_Import
                 U PyCapsule_New
                 U PyCapsule_Type
                 U PyCode_New
                 U PyCode_NewEmpty
                 U PyDict_GetItemString
                 U PyDict_New
                 U PyDict_Next
                 U PyDict_SetItem
                 U PyDict_SetItemString
                 U PyDict_Size
                 U PyErr_Clear
                 U PyErr_ExceptionMatches
                 U PyErr_Format
                 U PyErr_GivenExceptionMatches
                 U PyErr_NormalizeException
                 U PyErr_Occurred
                 U PyErr_SetObject
                 U PyErr_SetString
                 U PyErr_WarnEx
                 U PyErr_WarnFormat
                 U PyEval_EvalCodeEx
                 U PyEval_EvalFrameEx
                 U PyExc_AttributeError
                 U PyExc_DeprecationWarning
                 U PyExc_Exception
                 U PyExc_ImportError
                 U PyExc_NameError
                 U PyExc_OverflowError
                 U PyExc_RuntimeError
                 U PyExc_SystemError
                 U PyExc_TypeError
                 U PyExc_ValueError
                 U PyException_SetCause
                 U PyException_SetTraceback
                 U PyFloat_Type
                 U PyFrame_New
                 U PyFrame_Type
                 U PyFunction_Type
                 U PyImport_AddModule
                 U PyImport_GetModuleDict
                 U PyImport_ImportModule
                 U PyImport_ImportModuleLevelObject
0000000000006d3f T PyInit_np_datetime
                 U PyInterpreterState_GetID
                 U PyList_New
                 U PyLong_AsLong
                 U PyLong_AsSsize_t
                 U PyLong_FromLong
                 U PyLong_Type
                 U PyMem_Malloc
                 U PyMem_Realloc
                 U PyMethod_Type
                 U PyModuleDef_Init
                 U PyModule_AddObject
                 U PyModule_GetDict
                 U PyModule_NewObject
                 U PyNumber_Index
                 U PyNumber_Long
                 U PyOS_snprintf
                 U PyObject_Call
                 U PyObject_CallMethod
                 U PyObject_CallObject
                 U PyObject_Format
                 U PyObject_GetAttr
                 U PyObject_GetAttrString
                 U PyObject_HasAttrString
                 U PyObject_Hash
                 U PyObject_IsTrue
                 U PyObject_Not
                 U PyObject_RichCompare
                 U PyObject_SetAttr
                 U PyObject_SetAttrString
                 U PyObject_SetItem
                 U PyThreadState_Get
                 U PyTraceBack_Here
                 U PyTuple_New
                 U PyTuple_Pack
                 U PyType_IsSubtype
                 U PyType_Type
                 U PyUnicode_AsUTF[8](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:9)
                 U PyUnicode_AsUTF8AndSize
                 U PyUnicode_Compare
                 U PyUnicode_Concat
                 U PyUnicode_Decode
                 U PyUnicode_FromFormat
                 U PyUnicode_FromString
                 U PyUnicode_FromStringAndSize
                 U PyUnicode_InternFromString
                 U PyUnicode_New
                 U PyUnicode_Type
                 U Py_GetVersion
0000000000013a20 R _AS_MAX_DTS
0000000000013c20 R _AS_MIN_DTS
0000000000013[9](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:10)e0 R _FS_MAX_DTS
0000000000013be0 R _FS_MIN_DTS
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
00000000000138e0 R _MS_MAX_DTS
0000000000013ae0 R _MS_MIN_DTS
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0000000000013960 R _NS_MAX_DTS
0000000000013b60 R _NS_MIN_DTS
00000000000139a0 R _PS_MAX_DTS
0000000000013ba0 R _PS_MIN_DTS
                 U _PyDict_GetItem_KnownHash
                 U _PyDict_NewPresized
                 U _PyFloat_FormatAdvancedWriter
                 U _PyLong_FormatAdvancedWriter
                 U _PyObject_GetDictPtr
                 U _PyThreadState_UncheckedGet
                 U _PyUnicodeWriter_Dealloc
                 U _PyUnicodeWriter_Finish
                 U _PyUnicodeWriter_Init
                 U _PyUnicode_FastCopyCharacters
                 U _PyUnicode_Ready
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                 U _Py_CheckRecursiveCall
                 U _Py_Dealloc
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                 U _Py_NoneStruct
                 U _Py_TrueStruct
00000000000138a0 R _S_MAX_DTS
0000000000013aa0 R _S_MIN_DTS
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0000000000013b20 R _US_MIN_DTS
                 U __ctype_b_loc@GLIBC_2.3
                 w __cxa_finalize@GLIBC_2.2.5
                 w __gmon_start__
0000000000017d30 B __pyx_module_is_main_pandas___libs__tslibs__np_datetime
                 U __snprintf_chk@GLIBC_2.3.4
                 U __stack_chk_fail@GLIBC_2.4
00000000000119dc T _fini
0000000000005000 T _init
000000000000ea00 T add_minutes_to_datetimestruct
000000000000e7e0 T char_to_string
000000000000f060 T cmp_npy_datetimestruct
000000000000f1c0 T convert_pydatetime_to_datetimestruct
0000000000013800 R days_per_month_table
000000000000f760 T extract_unit
000000000000f130 T extract_utc_offset
00000000000[10](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:11)f30 T get_datetime_iso_8601_strlen
00000000000104d0 T get_datetime_metadata_from_dtype
000000000000eeb0 T get_datetimestruct_days
000000000000e7f0 T is_leapyear
00000000000[11](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:12)030 T make_iso_8601_datetime
000000000001[18](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:19)c0 T make_iso_8601_timedelta
                 U memcmp@GLIBC_2.2.5
                 U memcpy@GLIBC_2.2.5
000000000000f[46](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:47)0 T npy_datetimestruct_to_datetime
000000000000f780 T pandas_datetime_to_datetimestruct
000000000000fbb0 T pandas_timedelta_to_timedeltastruct
00000000000104e0 T parse_iso_8[60](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:8:61)1_datetime
```
</details>

<details>
<summary>Symbols in timestamps.so</summary>

```
Run nm -gD pandas/_libs/tslibs/timestamps.cpython-3[8](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:9:9)-x86_64-linux-gnu.so
                 U PyArg_UnpackTuple
                 U PyBaseObject_Type
                 U PyBool_Type
                 U PyBuffer_Release
                 U PyBytes_FromString
                 U PyBytes_FromStringAndSize
                 U PyBytes_Type
                 U PyCFunction_NewEx
                 U PyCFunction_Type
                 U PyCapsule_GetName
                 U PyCapsule_GetPointer
                 U PyCapsule_Import
                 U PyCapsule_IsValid
                 U PyCapsule_New
                 U PyCapsule_Type
                 U PyClassMethod_New
                 U PyCode_New
                 U PyCode_NewEmpty
                 U PyCoro_Type
                 U PyDescr_NewClassMethod
                 U PyDict_Copy
                 U PyDict_DelItem
                 U PyDict_GetItemString
                 U PyDict_GetItemWithError
                 U PyDict_New
                 U PyDict_Next
                 U PyDict_SetItem
                 U PyDict_SetItemString
                 U PyDict_Size
                 U PyDict_Type
                 U PyErr_Clear
                 U PyErr_ExceptionMatches
                 U PyErr_Fetch
                 U PyErr_Format
                 U PyErr_GivenExceptionMatches
                 U PyErr_NoMemory
                 U PyErr_NormalizeException
                 U PyErr_Occurred
                 U PyErr_PrintEx
                 U PyErr_Restore
                 U PyErr_SetNone
                 U PyErr_SetObject
                 U PyErr_SetString
                 U PyErr_WarnEx
                 U PyErr_WarnFormat
                 U PyErr_WriteUnraisable
                 U PyEval_EvalCodeEx
                 U PyEval_EvalFrameEx
                 U PyExc_AssertionError
                 U PyExc_AttributeError
                 U PyExc_BufferError
                 U PyExc_DeprecationWarning
                 U PyExc_Exception
                 U PyExc_GeneratorExit
                 U PyExc_ImportError
                 U PyExc_IndexError
                 U PyExc_NameError
                 U PyExc_NotImplementedError
                 U PyExc_OverflowError
                 U PyExc_RuntimeError
                 U PyExc_RuntimeWarning
                 U PyExc_StopIteration
                 U PyExc_SystemError
                 U PyExc_TypeError
                 U PyExc_UnboundLocalError
                 U PyExc_ValueError
                 U PyExc_ZeroDivisionError
                 U PyException_SetCause
                 U PyException_SetTraceback
                 U PyFloat_FromDouble
                 U PyFloat_Type
                 U PyFrame_New
                 U PyFrame_Type
                 U PyFunction_Type
                 U PyGILState_Ensure
                 U PyGILState_Release
                 U PyGen_Type
                 U PyImport_AddModule
                 U PyImport_GetModuleDict
                 U PyImport_ImportModule
                 U PyImport_ImportModuleLevelObject
00000000000[16](https://github.com/pandas-dev/pandas/runs/6844281294?check_suite_focus=true#step:9:17)34a T PyInit_timestamps
                 U PyInterpreterState_GetID
                 U PyList_Append
                 U PyList_AsTuple
                 U PyList_New
                 U PyList_Type
                 U PyLong_AsDouble
                 U PyLong_AsLong
                 U PyLong_AsSsize_t
                 U PyLong_FromLong
                 U PyLong_FromSsize_t
                 U PyLong_Type
                 U PyMem_Free
                 U PyMem_Malloc
                 U PyMem_Realloc
                 U PyMethodDescr_Type
                 U PyMethod_New
                 U PyMethod_Type
                 U PyModuleDef_Init
                 U PyModule_AddObject
                 U PyModule_GetDict
                 U PyModule_GetName
                 U PyModule_NewObject
                 U PyNumber_Add
                 U PyNumber_FloorDivide
                 U PyNumber_InPlaceAdd
                 U PyNumber_InPlaceMultiply
                 U PyNumber_InPlaceSubtract
                 U PyNumber_Index
                 U PyNumber_Long
                 U PyNumber_Multiply
                 U PyNumber_Negative
                 U PyNumber_Remainder
                 U PyNumber_Subtract
                 U PyNumber_TrueDivide
                 U PyOS_snprintf
                 U PyObject_Call
                 U PyObject_CallFinalizerFromDealloc
                 U PyObject_CallFunctionObjArgs
                 U PyObject_CallObject
                 U PyObject_ClearWeakRefs
                 U PyObject_Format
                 U PyObject_Free
                 U PyObject_GC_Del
                 U PyObject_GC_Track
                 U PyObject_GC_UnTrack
                 U PyObject_GenericGetAttr
                 U PyObject_GetAttr
                 U PyObject_GetAttrString
                 U PyObject_GetBuffer
                 U PyObject_GetItem
                 U PyObject_GetIter
                 U PyObject_Hash
                 U PyObject_IsSubclass
                 U PyObject_IsTrue
                 U PyObject_Malloc
                 U PyObject_Not
                 U PyObject_RichCompare
                 U PyObject_RichCompareBool
                 U PyObject_SelfIter
                 U PyObject_SetAttr
                 U PyObject_SetAttrString
                 U PyObject_SetItem
                 U PyObject_Size
                 U PyRun_StringFlags
                 U PySequence_Contains
                 U PySequence_Tuple
                 U PySlice_New
                 U PySlice_Type
                 U PyThreadState_Get
                 U PyThread_allocate_lock
                 U PyThread_free_lock
                 U PyTraceBack_Here
                 U PyTraceBack_Type
                 U PyTuple_GetItem
                 U PyTuple_GetSlice
                 U PyTuple_New
                 U PyTuple_Pack
                 U PyTuple_Type
                 U PyType_GetFlags
                 U PyType_IsSubtype
                 U PyType_Modified
                 U PyType_Ready
                 U PyType_Type
                 U PyUnicode_AsUTF8
                 U PyUnicode_Compare
                 U PyUnicode_Concat
                 U PyUnicode_Decode
                 U PyUnicode_DecodeASCII
                 U PyUnicode_Format
                 U PyUnicode_FromFormat
                 U PyUnicode_FromString
                 U PyUnicode_FromStringAndSize
                 U PyUnicode_InternFromString
                 U PyUnicode_New
                 U PyUnicode_Type
                 U Py_FatalError
                 U Py_GetVersion
                 U Py_OptimizeFlag
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 U _PyDict_GetItem_KnownHash
                 U _PyDict_NewPresized
                 U _PyDict_SetItem_KnownHash
                 U _PyFloat_FormatAdvancedWriter
                 U _PyGen_Send
                 U _PyList_Extend
                 U _PyLong_FormatAdvancedWriter
                 U _PyObject_CallFunction_SizeT
                 U _PyObject_GC_New
                 U _PyObject_GenericGetAttrWithDict
                 U _PyObject_GetDictPtr
                 U _PyThreadState_UncheckedGet
                 U _PyTraceMalloc_NewReference
                 U _PyType_Lookup
                 U _PyUnicodeWriter_Dealloc
                 U _PyUnicodeWriter_Finish
                 U _PyUnicodeWriter_Init
                 U _PyUnicode_FastCopyCharacters
                 U _PyUnicode_Ready
                 U _Py_CheckRecursionLimit
                 U _Py_CheckRecursiveCall
                 U _Py_Dealloc
                 U _Py_FalseStruct
                 U _Py_NoneStruct
                 U _Py_TrueStruct
                 U _Py_tracemalloc_config
                 w __cxa_finalize@GLIBC_2.2.5
                 w __gmon_start__
0000000000080ae0 B __pyx_module_is_main_pandas___libs__tslibs__timestamps
                 U __stack_chk_fail@GLIBC_2.4
                 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
```
</details>

 @rhshadrach great debugging on this. I think the main thing of importance here is the symbol table for `timestamps.so` Your good build has 

```sh
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

```sh
                 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 