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-rw-r--r--paramiko/transport.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/paramiko/transport.py b/paramiko/transport.py
index dd389a88..04680a9f 100644
--- a/paramiko/transport.py
+++ b/paramiko/transport.py
@@ -1530,6 +1530,10 @@ class Transport (threading.Thread):
# indefinitely, creating a GC cycle and not letting Transport ever be
# GC'd. it's a bug in Thread.)
+ # Hold reference to 'sys' so we can test sys.modules to detect
+ # interpreter shutdown.
+ self.sys = sys
+
# Required to prevent RNG errors when running inside many subprocess
# containers.
Random.atfork()