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Description
test.test_asyncio.test_events.KqueueEventLoopTests.test_create_connection triggers-fsanitize=alignment errors on macOS (i.e. Darwin):
Modules/socketmodule.c:5790:34: runtime error: load of misaligned address 0x60d0001ca152 for type 'char *', which requires 8 byte alignment0x60d0001ca152: note: pointer points here 6f 73 74 00 62 a1 1c 00 d0 60 00 00 00 00 00 00 00 00 00 00 31 2e 30 2e 30 2e 31 32 37 2e 69 6e ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/socketmodule.c:5790:34 in Modules/socketmodule.c:5792:40: runtime error: load of misaligned address 0x60d0001ca152 for type 'char *', which requires 8 byte alignment0x60d0001ca152: note: pointer points here 6f 73 74 00 62 a1 1c 00 d0 60 00 00 00 00 00 00 00 00 00 00 31 2e 30 2e 30 2e 31 32 37 2e 69 6e ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/socketmodule.c:5792:40 in Modules/socketmodule.c:5804:32: runtime error: load of misaligned address 0x60d0001ca179 for type 'char *', which requires 8 byte alignment0x60d0001ca179: note: pointer points here 72 70 61 00 89 a1 1c 00 d0 60 00 00 00 00 00 00 00 00 00 00 7f 00 00 01 00 00 00 b9 96 6e cc b9 ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/socketmodule.c:5804:32 in Modules/socketmodule.c:5817:35: runtime error: load of misaligned address 0x60d0001ca179 for type 'char *', which requires 8 byte alignment0x60d0001ca179: note: pointer points here 72 70 61 00 89 a1 1c 00 d0 60 00 00 00 00 00 00 00 00 00 00 7f 00 00 01 00 00 00 b9 96 6e cc b9 ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/socketmodule.c:5817:35 inI believe this issue is also present in this line (but I am not aware if any tests cover it):
cpython/Modules/socketmodule.c
Line 5834 inac66cc1
| memcpy(&sin6.sin6_addr,*pch,sizeof(sin6.sin6_addr)); |
Likewise in test.test_grp.GroupDatabaseTestCase.test_errors:
Modules/grpmodule.c:68:30: runtime error: load of misaligned address 0x6080006331f4 for type 'char *', which requires 8 byte alignment0x6080006331f4: note: pointer points here 72 00 2a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 32 63 00 80 60 00 00 ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/grpmodule.c:68:30 in Modules/grpmodule.c:69:49: runtime error: load of misaligned address 0x60c00474bcdb for type 'char *', which requires 8 byte alignment0x60c00474bcdb: note: pointer points here 64 00 2a 00 eb bc 74 04 c0 60 00 00 00 00 00 00 00 00 00 00 5f 6b 6e 6f 77 6c 65 64 67 65 67 72 ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Modules/grpmodule.c:69:49 inTo be clear, these tests pass, and the misaligned pointers are produced by the OS and not Python. The misaligned pointers appear to be a known issue, presumably one which Apple may never resolve (given these are functions inherited from BSD, and newer functions likegetaddrinfo() are preferred according to man pages). The workaround is to usememcpy() (see e.g.php/php-src@26ac6cb).