“unable to inject library into process without libc” when attach to child process that origin=exec

examples/child_gating.py から始め、origin が fork から exec に変わる Android の child-added シーケンスを再現します。frida/core.py と、報告されている frida_tools/application.py の呼び出し箇所を通る attach パスを追跡し、成功する fork attach と失敗する exec attach を比較します。報告された exec ケースが解決されるか、サポートされていない動作であることが明確に確立され、適切な回帰チェックでカバーされれば完了です。

this is my environment:
genymotion: 3.2.1 + Samsung Galaxy S7 6.0-API 23,also test on Google Nexus 5X 8.0-API 26
frida-server: frida-server-15.1.17-android-x86,also tested frida-server-15.1.14-android-x86 and frida-server-15.0.0-android-x86
script: https://github.com/frida/frida-python/blob/master/examples/child_gating.py
I only changed the argv to myappid
def _start(self):
argv = [myappid]

and I got these outputs:

✔ spawn(argv=['myappid'])
✔ attach(pid=4486)
✔ enable_child_gating()
✔ create_script()
✔ resume(pid=4486)
⚡ child_added: Child(pid=4602, parent_pid=4486, origin=fork)
✔ attach(pid=4602)
✔ enable_child_gating()
✔ create_script()
✔ resume(pid=4602)
⚡ child_removed: Child(pid=4602, parent_pid=4486, origin=fork)
⚡ child_added: Child(pid=4602, parent_pid=4602, origin=exec, ......)
✔ attach(pid=4602)
Exception in thread Thread-1:
Traceback (most recent call last):
File "/home/nothing/miniconda3/lib/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/home/nothing/miniconda3/lib/python3.7/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/home/nothing/miniconda3/lib/python3.7/site-packages/frida_tools/application.py", line 765, in _run
work()
File "lavpn.usa_spawn_gating.py", line 20, in
self._device.on("child-added", lambda child: self._reactor.schedule(lambda: self._on_child_added(child)))
File "lavpn.usa_spawn_gating.py", line 61, in _on_child_added
self._instrument(child.pid, child)
File "lavpn.usa_spawn_gating.py", line 45, in _instrument
session = self._device.attach(pid)
File "/home/nothing/miniconda3/lib/python3.7/site-packages/frida/core.py", line 26, in wrapper
return f(*args, **kwargs)
File "/home/nothing/miniconda3/lib/python3.7/site-packages/frida/core.py", line 165, in attach
return Session(self._impl.attach(self._pid_of(target), *args, **kwargs))
frida.NotSupportedError: unable to inject library into process without libc

We can see that when attach the child process which origin is fork,it's ok.
but when attach the same process which origin changed to exec,the error occurs.
I searched and find https://github.com/frida/frida/issues/936,but no lucky.
I think maybe because I used genymotion emulator, but why first attach is ok?