Even with my committed fix, tracebacks triggered by initializing a parent package are still suppressed:

$ ./python -m hello
Traceback (most recent call last):
  File "/media/disk/home/proj/python/cpython/Lib/runpy.py", line 158, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/media/disk/home/proj/python/cpython/Lib/runpy.py", line 116, in _get_module_details
    __import__(mod_name)  # Do not catch exceptions initializing package
  File "/media/disk/home/proj/python/cpython/hello/__init__.py", line 1, in <module>
    import random; random.dsgjdgj
AttributeError: module 'random' has no attribute 'dsgjdgj'
[Exit 1]
$ ./python -m hello.submodule
/media/disk/home/proj/python/cpython/python: Error while finding spec for 'hello.submodule' (<class 'AttributeError'>: module 'random' has no attribute 'dsgjdgj')
[Exit 1]

Fixing this in general might require a loop around the find_spec() call as in init-ancestor.patch. But I’m unsure if it is worth the extra complication.