Here is a more complete output. localeconv() fails in the hu_HU locale for the "thousands_sep" field: localeconv() returns b'\xa0' which is decoded as the wchar_t* string: {U+30000020} (len=1). This is an invalid character
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[ 54/361/3] test__locale
Decode wchar_t {U+0043} (len=1)
SET LOCALE "es_UY"
SET LOCALE "fr_FR"
SET LOCALE "fi_FI"
SET LOCALE "es_CO"
SET LOCALE "pt_PT"
SET LOCALE "it_IT"
SET LOCALE "et_EE"
SET LOCALE "es_PY"
SET LOCALE "no_NO"
SET LOCALE "nl_NL"
SET LOCALE "lv_LV"
SET LOCALE "el_GR"
SET LOCALE "be_BY"
SET LOCALE "fr_BE"
SET LOCALE "ro_RO"
SET LOCALE "ru_UA"
SET LOCALE "ru_RU"
SET LOCALE "es_VE"
SET LOCALE "ca_ES"
SET LOCALE "se_NO"
SET LOCALE "es_EC"
SET LOCALE "id_ID"
SET LOCALE "ka_GE"
SET LOCALE "es_CL"
SET LOCALE "hu_HU"
SET LOCALE -> hu_HU
Decode wchar_t {U+0068 U+0075 U+005f U+0048 U+0055} (len=5)
SET LOCALE "hu_HU"
SET LOCALE -> hu_HU
Decode wchar_t {U+0068 U+0075 U+005f U+0048 U+0055} (len=5)
Decode wchar_t {U+002c} (len=1)
Decode localeconv() decimal_point: {0x2c} (len=1)
Decode wchar_t {U+002c} (len=1)
Decode localeconv() thousands_sep: {0xa0} (len=1)
Decode wchar_t {U+30000020} (len=1)
Invalid Unicode string! {U+30000020} (len=1)
Fatal Python error: Aborted

Current thread 0x00000001:
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/test__locale.py", line 105 in test_lc_numeric_basic
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 385 in _executeTestPart
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 440 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 492 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 105 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 67 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 105 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 67 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/runner.py", line 168 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/support.py", line 1368 in _run_suite
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/support.py", line 1402 in run_unittest
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/test__locale.py", line 141 in test_main
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/regrtest.py", line 1203 in runtest_inner
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/regrtest.py", line 906 in runtest
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/regrtest.py", line 709 in main
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/__main__.py", line 13 in <module>
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/runpy.py", line 73 in _run_code
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/runpy.py", line 160 in _run_module_as_main
*** Error code 134
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