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fix: Fixed potential deadlock from unexpected __del__ call #3654

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May 26, 2025
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5 changes: 5 additions & 0 deletions redis/client.py
Original file line number Diff line number Diff line change
@@ -369,6 +369,8 @@ def __init__(
]:
raise RedisError("Client caching is only supported with RESP version 3")

# TODO: To avoid breaking changes during the bug fix, we have to keep non-reentrant lock.
# TODO: Remove this before next major version (7.0.0)
self.single_connection_lock = threading.Lock()
self.connection = None
self._single_connection_client = single_connection_client
@@ -774,6 +776,9 @@ def __init__(
self._event_dispatcher = EventDispatcher()
else:
self._event_dispatcher = event_dispatcher

# TODO: To avoid breaking changes during the bug fix, we have to keep non-reentrant lock.
# TODO: Remove this before next major version (7.0.0)
self._lock = threading.Lock()
if self.encoder is None:
self.encoder = self.connection_pool.get_encoder()
6 changes: 3 additions & 3 deletions redis/cluster.py
Original file line number Diff line number Diff line change
@@ -710,7 +710,7 @@ def __init__(
self.result_callbacks = CaseInsensitiveDict(self.__class__.RESULT_CALLBACKS)

self.commands_parser = CommandsParser(self)
self._lock = threading.Lock()
self._lock = threading.RLock()

def __enter__(self):
return self
@@ -1474,7 +1474,7 @@ def __init__(
self.connection_kwargs = kwargs
self.read_load_balancer = LoadBalancer()
if lock is None:
lock = threading.Lock()
lock = threading.RLock()
self._lock = lock
if event_dispatcher is None:
self._event_dispatcher = EventDispatcher()
@@ -2178,7 +2178,7 @@ def __init__(
kwargs.get("decode_responses", False),
)
if lock is None:
lock = threading.Lock()
lock = threading.RLock()
self._lock = lock
self.parent_execute_command = super().execute_command
self._execution_strategy: ExecutionStrategy = (
14 changes: 11 additions & 3 deletions redis/connection.py
Original file line number Diff line number Diff line change
@@ -820,7 +820,7 @@ def __init__(
self.credential_provider = conn.credential_provider
self._pool_lock = pool_lock
self._cache = cache
self._cache_lock = threading.Lock()
self._cache_lock = threading.RLock()
self._current_command_cache_key = None
self._current_options = None
self.register_connect_callback(self._enable_tracking_callback)
@@ -1420,8 +1420,16 @@ def __init__(
# object of this pool. subsequent threads acquiring this lock
# will notice the first thread already did the work and simply
# release the lock.
self._fork_lock = threading.Lock()
self._lock = threading.Lock()

self._fork_lock = threading.RLock()

if self.cache is None:
self._lock = threading.RLock()
else:
# TODO: To avoid breaking changes during the bug fix, we have to keep non-reentrant lock.
# TODO: Remove this before next major version (7.0.0)
self._lock = threading.Lock()

self.reset()

def __repr__(self) -> (str, str):