[Python] Segfault in test_pandas with Python 2.7

[asfimport]

I get a segfault in test_pandas with Python 2.7.

gdb stack trace (excerpt):

Thread 27 "python" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffb7fff700 (LWP 17725)]
0x00007fffcac1a9f9 in arrow::py::internal::PyDate_from_int (val=10957, unit=arrow::DateUnit::DAY, out=0x555555e1b9b0) at ../src/arrow/python/datetime.cc:229
229	  *out = PyDate_FromDate(static_cast<int32_t>(year), static_cast<int32_t>(month),
(gdb) bt
#0  0x00007fffcac1a9f9 in arrow::py::internal::PyDate_from_int (val=10957, unit=arrow::DateUnit::DAY, out=0x555555e1b9b0) at ../src/arrow/python/datetime.cc:229
#1  0x00007fffcabaed34 in arrow::Status arrow::py::ConvertDates<arrow::Date32Type>(arrow::py::PandasOptions const&, arrow::ChunkedArray const&, _object**)::{lambda(int, _object**)#1}::operator()(int, _object**) const (this=0x7fffb7ffde90, value=10957, out=0x555555e1b9b0) at ../src/arrow/python/arrow_to_pandas.cc:657
#2  0x00007fffcabaeb8c in arrow::Status arrow::py::ConvertAsPyObjects<arrow::Date32Type, arrow::Status arrow::py::ConvertDates<arrow::Date32Type>(arrow::py::PandasOptions const&, arrow::ChunkedArray const&, _object**)::{lambda(int, _object**)#1}&>(arrow::py::PandasOptions const&, arrow::ChunkedArray const&, arrow::Status arrow::py::ConvertDates<arrow::Date32Type>(arrow::py::PandasOptions const&, arrow::ChunkedArray const&, _object**)::{lambda(int, _object**)#1}&, _object**)::{lambda(int const&, _object**)#1}::operator()(int const, _object**) const (this=0x7fffb7ffdd88, value=@0x7fffb7ffdcbc: 10957, out_values=0x555555e1b9b0)
    at ../src/arrow/python/arrow_to_pandas.cc:417

Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #5416

_{Note: This issue was originally created as ARROW-6597. Please see the migration documentation for further details.}

[asfimport]

Krisztian Szucs / @kszucs:
@pitrou why wasn't it catched by the CI?

[asfimport]

Antoine Pitrou / @pitrou:
I have no idea :-/ Perhaps you don't install Pandas on the 2.7 builder?

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 5416
#5416

[asfimport]

Krisztian Szucs / @kszucs:
Pandas is installed, see https://ci.ursalabs.org/#/builders/72/builds/4590/steps/10/logs/stdio

[asfimport]

Wes McKinney / @wesm:
I'm guessing this is what has been crashing the sphinx-build lately

[asfimport]

Antoine Pitrou / @pitrou:
Yes it is.