c-client / zkpython: Double free corruption on node watcher
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Key: ZOOKEEPER-888
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-888
Project: Zookeeper
Issue Type: Bug
Components: c client, contrib-bindings
Affects Versions: 3.3.1
Reporter: Lukas
Priority: Critical
Attachments: resume-segfault.py
the c-client / zkpython wrapper invokes already freed watcher callback
steps to reproduce:
0. start a zookeper server on your machine
1. run the attached python script
2. suspend the zookeeper server process (e.g. using `pkill -STOP -f
org.apache.zookeeper.server.quorum.QuorumPeerMain` )
3. wait until the connection and the node observer fired with a session event
4. resume the zookeeper server process (e.g. using `pkill -CONT -f
org.apache.zookeeper.server.quorum.QuorumPeerMain` )
-> the client tries to dispatch the node observer function again, but it was
already freed -> double free corruption
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