[issue42985] AMD64 Arch Linux Asan 3.x fails: command timed out: 1200 seconds without output

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

For faulthandler.enable(), maybe we reset SIGSEGV signal handler to the default handler if __has_feature(address_sanitizer) is true:
https://clang.llvm.org/docs/AddressSanitizer.html#conditional-compilation-with-has-feature-address-sanitizer

But we cannot do that in faulthandler._sigsegv() since this function is used to test_faulthandler to check the signal handler installed by faulthandler previously.

Maybe we should add a function to test.support which resets the signal handler and then trigger a crash.

There are multiple functions which trigger crashes on purpose:

* _testcapi.crash_no_current_thread() => Py_FatalError()
* _testcapi.return_null_without_error() => Py_FatalError()
* _testcapi.return_result_wit_error() => Py_FatalError()
* _testcapi.negative_refcount() => Py_FatalError()
* _testcapi.pymem_buffer_overflow() => Py_FatalError()
* _testcapi.set_nomemory(0) is used to trigger a _PyErr_NormalizeException crash => Py_FatalError()
* etc.

Py_FatalError() calls abort() which raises SIGABRT signal, but ASAN doesn't catch this signal.

More generally, search for support.SuppressCrashReport usage in tests.

See also faulthandler_suppress_crash_report() C function.

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<https://bugs.python.org/issue42985>
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