Github user lvfangmin commented on the issue:
https://github.com/apache/zookeeper/pull/647
@anmolnar here is the scenario shows why the previous fix on master has
problem:
1. parent A is in it's parent's serializing list
2. before it's being serialized, child 1 was deleted in txn T1, and child 2
was created in txn T2
3. when parent A is serialized, it's cversion and pzxid is already updated
correctly by T2
4. when reloading from disk, T1 will update the pzxid and left cversion
there
5. T2 checked the node, and it's already there, then it goes to the
patching process, and it found the parent's cversion is already up to date and
skipped patching it, which leaves the pzxid in stale state
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