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Related Issue: #7140 ### Brief Summary On macOS, when test worker hard fails (abort, EXC_BAD_ACCESS, etc.), backward_cpp's signal handler will re-raise the signal and catch it afterwards, make it an infinite loop, at the moment the offending process can't be terminated easily (except a SIGKILL), eat CPU cycles and blocks test runner. ``` (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT * frame #0: 0x00000001a04f0e28 libsystem_kernel.dylib`__pthread_kill + 8 frame #1: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #2: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #3: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #4: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #5: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #6: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #7: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #8: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #9: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #10: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #11: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #12: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #13: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #14: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #15: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #16: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #17: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #18: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #19: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #20: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #21: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #22: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #23: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #24: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #25: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #26: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #27: 0x00000001283a0848 taichi_python.cpython-38-darwin.so`backward::SignalHandling::sig_handler(int, __siginfo*, void*) + 28 frame #28: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #29: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #30: 0x00000001a0402e10 libsystem_c.dylib`raise + 32 frame #31: 0x00000001a056ec44 libsystem_platform.dylib`_sigtramp + 56 frame #32: 0x00000001a052343c libsystem_pthread.dylib`pthread_kill + 292 frame #33: 0x00000001a046b454 libsystem_c.dylib`abort + 124 frame #34: 0x0000000100194fc0 python`os_abort + 12 frame #35: 0x00000001000758a8 python`cfunction_vectorcall_NOARGS + 324 frame #36: 0x00000001001140f0 python`call_function + 460 frame #37: 0x000000010011086c python`_PyEval_EvalFrameDefault + 27176 frame #38: 0x00000001000287e4 python`function_code_fastcall + 128 frame #39: 0x0000000100028008 python`PyVectorcall_Call + 120 frame #40: 0x0000000100110b20 python`_PyEval_EvalFrameDefault + 27868 frame #41: 0x000000010010982c python`_PyEval_EvalCodeWithName + 3008 frame #42: 0x0000000100028948 python`_PyFunction_Vectorcall + 208 frame #43: 0x0000000100028008 python`PyVectorcall_Call + 120 ```
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