When running the following example the python interpreter exists abnormally (exit code -1073741819)

The code that causes the exception is the maxnan() function in bottleneck.

This error only occurs when:

1. The data contains a dimension with length 1
2. The data is transposed
3. bottleneck is used

So I suspect that the transpose function changes the data somehow such that bottleneck can not handle it anymore.

• Calling bn.maxnan on a normal ndarray works fine
• Calling data.max() before transposing works fine
• Running the example without using bottleneck (either by not installing it or by disabling it in OPTIONS) works fine
• Running the example with len(time) > 1 works fine

What happened:

Process finished with exit code -1073741819 (0xC0000005)

What you expected to happen:

Script should run without crashing

Minimal Complete Verifiable Example:

```python from collections import OrderedDict import numpy as np import xarray as xr

xr.show_versions()

n_time = 1 # 1 : Fails, 2 : everything is fine

from xarray.core.options import OPTIONS OPTIONS["use_bottleneck"] = True # Set to False for work-around

Build some dataset

dirs = np.linspace(0,360, num=121) freqs = np.linspace(0,4,num=192) spec_data = np.random.random(size=(n_time,192,121))

dims = ('time', 'freq', 'dir') coords = OrderedDict() coords['time'] = range(n_time) coords['freq'] = freqs coords['dir'] = dirs

xdata = xr.DataArray( data=spec_data, coords=coords, dims=dims, name='Spec name', ).to_dataset()

xdata = xdata.transpose(..., "freq") # remove this line and the script will run

tm = xdata.max() print('Done') ```

Anything else we need to know?:

Uhm... it was really hard to dig this deep? :-)

Environment:

Tested with python 3.8 and 3.9 on win64. Only required packages are xarray and bottleneck. For example:

yml name: ws dependencies: - python=3.9 - xarray channels: - defaults - conda-forge

note: xarray requires pandas which installs bottleneck. To install without bottleneck pin pandas to 1.2.4

Output of <tt>xr.show_versions()</tt>

INSTALLED VERSIONS ------------------ commit: None python: 3.9.7 (default, Sep 16 2021, 16:59:28) [MSC v.1916 64 bit (AMD64)] python-bits: 64 OS: Windows OS-release: 10 machine: AMD64 processor: AMD64 Family 23 Model 96 Stepping 1, AuthenticAMD byteorder: little LC_ALL: None LANG: None LOCALE: ('English_United States', '1252') libhdf5: None libnetcdf: None xarray: 0.20.1 pandas: 1.2.4 numpy: 1.21.4 scipy: None netCDF4: None pydap: None h5netcdf: None h5py: None Nio: None zarr: None cftime: None nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: 1.3.2 dask: None distributed: None matplotlib: None cartopy: None seaborn: None numbagg: None fsspec: None cupy: None pint: None sparse: None setuptools: 59.1.1 pip: 21.3.1 conda: None pytest: None IPython: None sphinx: None