Muralidhar BN <muralidhar...@gmail.com> added the comment:
We have checked this issue by adapting another 3rd party SSH packages ( replace paramiko with pyssh). Using this we have found same o/p results. Which means it is not 3rd party SSH package ( paramiko or pyssh) issue. Issue report in Paramiko github will be removed (https://github.com/paramiko/paramiko/issues/1856) To our analysis this issue is not observed when "logging" module is disabled. Request to provide your analysis from python perspective ? Executing code qa-test-execute.py in Py 2.7 (Ubuntu 14.04.6 LTS) Command 1 : sudo python ./qa-test-execute.py Output 1 : 2021-05-25 21:23:44,889[BaseCommandLine __init__ 140392385488400][DEBUG]: Attempt to close ssh-session within 10.0 seconds. Exception AssertionError: 'attempt to release recursive lock not owned by thread' in <bound method BaseCommandLine1.__del__ of <__main__.BaseCommandLine1 object at 0x7fafa6442610>> ignored Command 2 : 2021-05-25 21:23:44,889[BaseCommandLine __init__ 140392385488400][DEBUG]: Attempt to close ssh-session within 10.0 seconds. Exception AssertionError: 'attempt to release recursive lock not owned by thread' in <bound method BaseCommandLine1.__del__ of <__main__.BaseCommandLine1 object at 0x7fafa6442610>> ignored Executing code qa-test-execute.py in Py 3.69 (Ubuntu 18.04.5 LTS) Command 1 : sudo python3 ./qa-test-execute.py Output 1 : 2021-05-25 22:32:54,945[BaseCommandLine __init__ 140490991571128][DEBUG]: Attempt to close ssh-session within 10.0 seconds. 2021-05-25 22:32:54,945[BaseCommandLine __init__ 140490991571128][DEBUG]: Closing internal ssh-client. Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads Thread 0x00007fc69880e700 (most recent call first): File "/usr/lib/python3.6/logging/__init__.py", line 997 in emit File "/usr/lib/python3.6/logging/__init__.py", line 865 in handle File "/usr/lib/python3.6/logging/__init__.py", line 1516 in callHandlers File "/usr/lib/python3.6/logging/__init__.py", line 1454 in handle File "/usr/lib/python3.6/logging/__init__.py", line 1444 in _log File "/usr/lib/python3.6/logging/__init__.py", line 1296 in debug File "./qa-test-execute_sajal.py", line 132 in __nonblocking_close1 File "/usr/lib/python3.6/threading.py", line 864 in run File "/usr/lib/python3.6/threading.py", line 916 in _bootstrap_inner File "/usr/lib/python3.6/threading.py", line 884 in _bootstrap Current thread 0x00007fc69dab5740 (most recent call first): File "./qa-test-execute_sajal.py", line 48 in call_with_timeout1 File "./qa-test-execute_sajal.py", line 117 in close1 File "./qa-test-execute_sajal.py", line 83 in __del__ Aborted (core dumped) Command 2 : sudo python3 ./qa-test-execute.py 2>&1 | tee launcher_gt20907_24052021_execute_py369_1.log Output 2 : 2021-05-25 22:33:26,393[BaseCommandLine __init__ 140711046725760][DEBUG]: Attempt to close ssh-session within 10.0 seconds. 2021-05-25 22:33:26,393[BaseCommandLine __init__ 140711046725760][DEBUG]: Closing internal ssh-client. ^C Behaviour of same code is different when executed in Py 2.7 & Py 3.69. qa-test-execute.py #!/usr/bin/env python3 import sys import traceback import logging import logging.config import time import threading import multiprocessing import pyssh ######################################################################## def lock_acquire_with_timeout1(lock, timeout_seconds): """ Try to acquire lock without specified timeout @param lock: threading lock to be acquired @type lock: threading.Lock @param timeout_seconds: maximal time to make lock acquire attempts @type timeout_seconds: float """ begin_time = time.time() while time.time() - begin_time < timeout_seconds: if lambda: lock.acquire(False): return True else: time.sleep(1.0) return None def call_with_timeout1(method_to_call, timeout_seconds): """ Good for potentially "freeze" methods calls. Executes passed method in separate thread. Waits for control returns within timeout. If timeout exceed - return control to callee thread. Separate execution thread will still be active. @param method_to_call: method te be called @type method_to_call: function @param timeout_seconds: maximal time to wait for method call finished @type timeout_seconds: float """ stop_thread = threading.Barrier(2) thread_name = threading._newname("{}-%d".format(__name__)) call_thread = threading.Thread(target=method_to_call, name=thread_name) call_thread.daemon = True call_thread.start() print ("threading.activeCount() : %s",threading.activeCount()) print ("threading.currentThread() : %s", threading.currentThread()) print ("threading.enumerate() : %s", threading.enumerate() ) call_thread.join(timeout=timeout_seconds) if call_thread.is_alive(): stop_thread.abort() return not call_thread.is_alive() def format_all_threads_stacks1(): """ @return: formatted stacks for all running threads. """ stacktraces = [] for thread_id, stack in list(dict(list(sys._current_frames().items())).items()): for thread1 in threading.enumerate(): if thread1.ident == thread_id: stacktraces.append('Thread %s (daemon=%r) stacktrace: \n%s' % (thread1.name, thread1.daemon, ''.join(traceback.format_stack(stack)))) else: thread = None return '\n'.join(stacktraces) class BaseCommandLine1(object): def __init__(self, connection_timeout=None): self._connection_timeout = connection_timeout self._connection_lock = multiprocessing.RLock() self._ssh_client = None self.logger = logging.getLogger('BaseCommandLine __init__ {}'.format(id(self))) self.reset_connection1() def __del__(self): self.close1() def _wait_for_connection1(self): begin_time = time.time() self.logger.debug("Will attempt to connect with device for %s seconds." % self._connection_timeout) while time.time() - begin_time < self._connection_timeout: try: self._connect_ssh1() self.logger.debug('BaseCommandLine1 new SSH connection with {}:{} established.'. format("10.221.42.29", "22")) break except Exception as e: self.logger.debug('BaseCommandLine1 SSH-connection failed after %d seconds passed with exception: %s' % (time.time() - begin_time, e)) self.logger.debug('BaseCommandLine1 Next attempt after {} seconds.'.format(5.0)) time.sleep(5.0) else: self.logger.debug('BaseCommandLine1 Failed to connect to {}:{} within {} seconds: {}'.format( "10.221.42.29","22",self._connection_timeout,traceback.format_exc())) def reset_connection1(self): with self._connection_lock: self.close1() self.logger.debug('reset connection begin.') self._wait_for_connection1() def close1(self): if not self._ssh_client: return close_timeout = 10.0 begin_time = time.time() self.logger.debug("Attempt to close ssh-session within %s seconds." % close_timeout) if lock_acquire_with_timeout1(self._connection_lock, close_timeout): try: if call_with_timeout1(self.__nonblocking_close1, timeout_seconds=close_timeout): self.logger.debug("Successfully closed SSHClient within %d seconds." % (time.time() - begin_time)) else: self.logger.warning("Failed to close SSHClient within %d seconds." % close_timeout) self.logger.warning("All threads state:\n%s" % format_all_threads_stacks1()) finally: self._connection_lock.release() else: self.logger.warning("Failed to acquire lock within %s timeout." % close_timeout) self._ssh_client = None def __nonblocking_close1(self): """ Non-blocking call to close SSH connection. May freeze on internal SSHClient.close(). """ self.logger.debug("Closing internal ssh-client.") if self._ssh_client: self._ssh_client.close1() self.logger.debug("Internal ssh-client closed.") self._ssh_client = None def _connect_ssh1(self, key_filename=None): try: s = pyssh.new_session(hostname="10.221.42.29", port="22", username="root", password="") r = s.execute("uname -a") print(r.as_bytes()) except Exception as e: print("Connection Error", str(e)) self._ssh_client = s return s def config_logging(): formatter = logging.Formatter("%(asctime)s[%(name)s]" "[%(levelname)s]: %(message)s") console_logger = logging.StreamHandler(sys.stdout) console_logger.setFormatter(formatter) root_logger = logging.getLogger() root_logger.setLevel(logging.DEBUG) root_logger.addHandler(logging.NullHandler()) paramiko_logger = logging.getLogger('paramiko') paramiko_logger.setLevel(logging.CRITICAL) paramiko_logger.addHandler(console_logger) console_logger.setLevel(logging.DEBUG) root_logger.addHandler(console_logger) def main(argv): config_logging() try: result = BaseCommandLine1(300) except Exception: logging.debug("Exception from BaseCommandLine1") logging.debug("Show all threads status before exit attempt:\n %s", format_all_threads_stacks1()) if __name__ == "__main__": main(sys.argv) ---------- resolution: third party -> remind status: closed -> open _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44226> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com