gh-157242: Add support.inject_memory_error() function by vstinner · Pull Request #157431 · python/cpython

vstinner · 2026-09-13T14:14:50Z

Add inject_memory_error() and memory_error_cm() functions to test.support to inject memory errors: make the memory allocator fail.

Issue: bytearray.resize() must not clear the object on error (memory allocation failure) #157242

Add inject_memory_error() and with_memory_error() functions to test.support to inject memory errors: make the memory allocator fail.

bedevere-bot · 2026-09-15T22:19:28Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Android 3.x (tier-3) has failed when building commit 9a1733d.

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HEAD is now at 9a1733d5712 gh-157242: Add support.inject_memory_error() function (#157431)
Switched to and reset branch 'main'

configure: WARNING: no system libmpdec found; falling back to pure-Python version for the decimal module
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.

../../Parser/lexer/string.c:81:20: warning: variable 'previous_end' set but not used [-Wunused-but-set-variable]
   81 |         _PyTok_Off previous_end = state->expr_span.start;
      |                    ^
1 warning generated.
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:285:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  285 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:292:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  292 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:438:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  438 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:445:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  445 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:551:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  551 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:560:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  560 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:582:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  582 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:593:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  593 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:690:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  690 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:735:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  735 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:761:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  761 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:772:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  772 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:785:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  785 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:930:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  930 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:943:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  943 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:960:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  960 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:967:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  967 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:1202:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1202 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:1222:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1222 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.

../../configure: line 4130: pkg-config: command not found
configure: WARNING: no system libmpdec found; falling back to pure-Python version for the decimal module
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.

../../Parser/lexer/string.c:81:20: warning: variable 'previous_end' set but not used [-Wunused-but-set-variable]
   81 |         _PyTok_Off previous_end = state->expr_span.start;
      |                    ^
1 warning generated.
../../Python/fileutils.c:484:1: warning: unused function 'decode_current_locale' [-Wunused-function]
  484 | decode_current_locale(const char* arg, wchar_t **wstr, size_t *wlen,
      | ^~~~~~~~~~~~~~~~~~~~~
../../Python/fileutils.c:703:1: warning: unused function 'encode_current_locale' [-Wunused-function]
  703 | encode_current_locale(const wchar_t *text, char **str,
      | ^~~~~~~~~~~~~~~~~~~~~
2 warnings generated.
../../Modules/_localemodule.c:195:1: warning: unused function 'is_all_ascii' [-Wunused-function]
  195 | is_all_ascii(const char *str)
      | ^~~~~~~~~~~~
1 warning generated.
../../Modules/pwdmodule.c:69:16: warning: unused variable 'pwd_db_mutex' [-Wunused-variable]
   69 | static PyMutex pwd_db_mutex = {0};
      |                ^~~~~~~~~~~~
1 warning generated.
../../Modules/_hacl/Lib_Memzero0.c:66:6: warning: "Your platform does not support any safe implementation of memzero -- consider a pull request!" [-W#warnings]
   66 |     #warning "Your platform does not support any safe implementation of memzero -- consider a pull request!"
      |      ^
1 warning generated.
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:285:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  285 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:292:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  292 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:438:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  438 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:445:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  445 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:551:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  551 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:560:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  560 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:582:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  582 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:593:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  593 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:690:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  690 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:735:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  735 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:761:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  761 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:772:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  772 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:785:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  785 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:930:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  930 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:943:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  943 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:960:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  960 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:118:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  118 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:967:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  967 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:1202:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1202 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:312:
../../Modules/expat/xmltok_impl.c:1222:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1222 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:89:5: note: expanded from macro 'CHECK_NAME_CASES'
   89 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  8676  100  8676    0     0   139k      0 --:--:-- --:--:-- --:--:--  141k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  2786  100  2786    0     0  64267      0 --:--:-- --:--:-- --:--:-- 64790
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 48462  100 48462    0     0   990k      0 --:--:-- --:--:-- --:--:-- 1006k
  + Exception Group Traceback (most recent call last):
  |   File "<frozen runpy>", line 198, in _run_module_as_main
  |   File "<frozen runpy>", line 88, in _run_code
  |   File "/Users/android/buildarea/3.x.mhsmith-android-aarch64/build/Platforms/Android/__main__.py", line 1070, in <module>
  |     main()
  |   File "/Users/android/buildarea/3.x.mhsmith-android-aarch64/build/Platforms/Android/__main__.py", line 1046, in main
  |     asyncio.run(result)
  |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/runners.py", line 194, in run
  |     return runner.run(main)
  |            ^^^^^^^^^^^^^^^^
  |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/runners.py", line 118, in run
  |     return self._loop.run_until_complete(task)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 687, in run_until_complete
  |     return future.result()
  |            ^^^^^^^^^^^^^^^
  |   File "/Users/android/buildarea/3.x.mhsmith-android-aarch64/build/Platforms/Android/__main__.py", line 733, in run_testbed
  |     async with asyncio.TaskGroup() as tg:
  |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/taskgroups.py", line 145, in __aexit__
  |     raise me from None
  | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
  +-+---------------- 1 ----------------
    | Traceback (most recent call last):
    |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/tasks.py", line 520, in wait_for
    |     return await fut
    |            ^^^^^^^^^
    |   File "/Users/android/buildarea/3.x.mhsmith-android-aarch64/build/Platforms/Android/__main__.py", line 494, in find_device
    |     await asyncio.sleep(1)
    |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/tasks.py", line 665, in sleep
    |     return await future
    |            ^^^^^^^^^^^^
    | asyncio.exceptions.CancelledError
    | 
    | The above exception was the direct cause of the following exception:
    | 
    | Traceback (most recent call last):
    |   File "/Users/android/buildarea/3.x.mhsmith-android-aarch64/build/Platforms/Android/__main__.py", line 547, in logcat_task
    |     serial = await wait_for(find_device(context, initial_devices), startup_timeout)
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/tasks.py", line 519, in wait_for
    |     async with timeouts.timeout(timeout):
    |   File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/timeouts.py", line 115, in __aexit__
    |     raise TimeoutError from exc_val
    | TimeoutError
    +------------------------------------

mhsmith · 2026-09-16T13:20:47Z

The Android failure should be fixed by python/buildmaster-config#796.

pythongh-157242: Add support.inject_memory_error() function

05e2821

Add inject_memory_error() and with_memory_error() functions to test.support to inject memory errors: make the memory allocator fail.

vstinner requested review from iritkatriel and kumaraditya303 as code owners September 13, 2026 14:14

vstinner added the skip news label Sep 13, 2026

bedevere-app Bot mentioned this pull request Sep 13, 2026

bytearray.resize() must not clear the object on error (memory allocation failure) #157242

Open

bedevere-app Bot added the awaiting core review label Sep 13, 2026

vstinner added 3 commits September 13, 2026 16:25

Fix pre-commit warning: remove unused import

48bebd3

Cleanup tests

2faf454

Rename with_memory_error() to memory_error_cm()

afaffe1

vstinner merged commit 9a1733d into python:main Sep 15, 2026
48 checks passed

vstinner deleted the memory_error branch September 15, 2026 21:18

bedevere-app Bot removed the awaiting core review label Sep 15, 2026

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gh-157242: Add support.inject_memory_error() function - #157431

gh-157242: Add support.inject_memory_error() function#157431
vstinner merged 4 commits into
python:mainfrom
vstinner:memory_error

vstinner commented Sep 13, 2026 •

edited

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bedevere-bot commented Sep 15, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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mhsmith commented Sep 16, 2026

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vstinner commented Sep 13, 2026 •

edited

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