BUG: lexsort segfaults on StringDType #27984
Description
Describe the issue:
Hi! I've been switching some code to the new StringDType and I came across a segfault when feeding StringDType arrays to lexsort. The example below is the same as in the documentation for lexsort: https://numpy.org/doc/stable/reference/generated/numpy.lexsort.html
Reproduce the code example:
#!/usr/bin/env python3
import numpy as np
from numpy.dtypes import StringDType
# Works
surnames = ('Hertz', 'Galilei', 'Hertz')
first_names = ('Heinrich', 'Galileo', 'Gustav')
ind = np.lexsort((first_names, surnames))
print(ind)
# Works
surnames2 = np.array(surnames, str)
first_names2 = np.array(first_names, str)
ind = np.lexsort((first_names2, surnames2))
print(ind)
# Segfaults
surnames2 = np.array(surnames, StringDType())
first_names2 = np.array(first_names, StringDType())
ind = np.lexsort((first_names2, surnames2))
print(ind)Error message:
No response
Python and NumPy Versions:
2.2.0
3.12.8 (main, Dec 4 2024, 12:15:27) [GCC 14.2.0]
Runtime Environment:
[{'numpy_version': '2.2.0',
'python': '3.12.8 (main, Dec 4 2024, 12:15:27) [GCC 14.2.0]',
'uname': uname_result(system='Linux', node='thalatta', release='6.11.10-amd64', version='#1 SMP PREEMPT_DYNAMIC Debian 6.11.10-1 (2024-11-23)', machine='x86_64')},
{'simd_extensions': {'baseline': ['SSE', 'SSE2', 'SSE3'],
'found': ['SSSE3',
'SSE41',
'POPCNT',
'SSE42',
'AVX',
'F16C',
'FMA3',
'AVX2'],
'not_found': ['AVX512F',
'AVX512CD',
'AVX512_KNL',
'AVX512_KNM',
'AVX512_SKX',
'AVX512_CLX',
'AVX512_CNL',
'AVX512_ICL']}},
{'architecture': 'Haswell',
'filepath': '.../venv/lib/python3.12/site-packages/numpy.libs/libscipy_openblas64_-6bb31eeb.so',
'internal_api': 'openblas',
'num_threads': 8,
'prefix': 'libscipy_openblas',
'threading_layer': 'pthreads',
'user_api': 'blas',
'version': '0.3.28'}]
Context for the issue:
No response