remote subprocess module failed to execute command when client connected with ClassicClient or MasterService

[Hitesh-1991]

I wanted to connect to slave service server with client service as MasterService/ClassicClient to avoid serving as slave to server. With this client connection, I am facing below error while executing command on remote server using subprocess.run with env={}

conn.modules.subprocess.run("ls", shell=True, timeout=10, capture_output=True) --> Working
conn.modules.subprocess.run("ls", shell=True, timeout=10, capture_output=True, env={}) --> Through exception as below

stack trace / error log

conn.modules.subprocess.run("ls", shell=True, timeout=10, capture_output=True, env={})
Traceback (most recent call last):
File "", line 1, in
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/netref.py", line 239, in call
return syncreq(_self, consts.HANDLE_CALL, args, kwargs)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/netref.py", line 63, in syncreq
return conn.sync_request(handler, proxy, *args)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 744, in sync_request
return async_res.value
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/async.py", line 111, in value
raise self._obj
_get_exception_class..Derived: cannot access 'items'

========= Remote Traceback (2) =========
Traceback (most recent call last):
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 369, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 863, in _handle_call
return obj(*args, **dict(kwargs))
File "/usr/lib/python3.10/subprocess.py", line 503, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib/python3.10/subprocess.py", line 971, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.10/subprocess.py", line 1779, in _execute_child
for k, v in env.items():
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/netref.py", line 152, in getattr
return syncreq(self, consts.HANDLE_GETATTR, name)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/netref.py", line 63, in syncreq
return conn.sync_request(handler, proxy, *args)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 744, in sync_request
return async_res.value
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/async.py", line 111, in value
raise self._obj
_get_exception_class..Derived: cannot access 'items'

========= Remote Traceback (1) =========
Traceback (most recent call last):
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 369, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 879, in _handle_getattr
return self._access_attr(obj, name, (), "_rpyc_getattr", "allow_getattr", getattr)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 806, in _access_attr
name = self._check_attr(obj, name, param)
File "/colossus/.local/lib/python3.10/site-packages/rpyc/core/protocol.py", line 796, in _check_attr
raise AttributeError(f"cannot access {name!r}")
AttributeError: cannot access 'items'

Environment

• rpyc version - 6.0.1
• python version - 3.10
• operating system - Ubuntu-22

Minimal example

Server:

import rpyc
class CustomService(rpyc.SlaveService):
    pass

if __name__ == "__main__":
    from rpyc.utils.server import ThreadedServer
    server = ThreadedServer(CustomService, port=18861)
    server.start()

Client:

>>> import rpyc
>>> from rpyc.utils import factory
>>> from rpyc.core.service import ClassicClient
>>> conn = factory.connect("localhost", 18861, ClassicClient)
>>> conn.modules.subprocess.run("ls", shell=True, timeout=10, capture_output=True) --> Working 
>>> conn.modules.subprocess.run("ls", shell=True, timeout=10, capture_output=True, env={}) --> Through exception as mention above