bdice opened a new issue, #34944:
URL: https://github.com/apache/arrow/issues/34944
### Describe the bug, including details regarding any error messages,
version, and platform.
I worked with @shwina recently on a problem we saw in cudf, and we
identified a bug in PyArrow. The bug can be reproduced (but only
intermittently) with the following snippet:
```python
import pyarrow as pa
class A:
def __getitem__(self, key):
return 3
pa.array(A())
```
I can run this snippet under `pdb` by inserting `breakpoint()` before
`pa.array(A())` and then continuing from the breakpoint by pressing `c`. With
`pdb`, I consistently get errors like:
```
WARNING: Logging before InitGoogleLogging() is written to STDERR
F20230406 15:12:07.595571 153661 inference.cc:348] Check failed: _s.ok()
Operation failed: internal::ImportDecimalType(&decimal_type_)
Bad status: Unknown error: <built-in function __import__> returned a result
with an exception set. Detail: Python exception: SystemError
*** Check failure stack trace: ***
```
Without `pdb`, the error is _sometimes_ this one (which I expect) and
_sometimes_ the crash shown above.
```python
Traceback (most recent call last):
File "/home/bdice/issue.py", line 16, in <module>
pa.array(A())
File "pyarrow/array.pxi", line 320, in pyarrow.lib.array
File "pyarrow/array.pxi", line 39, in pyarrow.lib._sequence_to_array
File "pyarrow/error.pxi", line 144, in
pyarrow.lib.pyarrow_internal_check_status
TypeError: object of type 'A' has no len()
```
We want a `TypeError` to be raised rather than getting the crash above under
`pdb`. The crash is reproducible without `pdb` if the snippet is run
repeatedly. This might suggest some kind of memory corruption is happening
behind the scenes.
### Component(s)
C++, Python
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