zhijiang created FLINK-9676:
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Summary: Deadlock during canceling task and recycling exclusive
buffer
Key: FLINK-9676
URL: https://issues.apache.org/jira/browse/FLINK-9676
Project: Flink
Issue Type: Bug
Components: Network
Affects Versions: 1.5.0
Reporter: zhijiang
Fix For: 1.5.1
It may cause deadlock between task canceler thread and task thread.
The detail is as follows:
Task canceler thread -> {{IC1#releaseAllResources}} -> recycle floating buffers
-> {color:#FF0000}lock{color} ({{LocalBufferPool#availableMemorySegments) ->
}}{{IC2#notifyBufferAvailable}}{{ -> {color:#FF0000}try to
lock{color:#333333}({color}{color}}}{{IC2#bufferQueue)}}
{{Task thread -> IC2#recycle -> {color:#d04437}lock{color}(IC2#bufferQueue) ->
}}{{bufferQueue#addExclusiveBuffer}} -> {{floatingBuffer#recycleBuffer}} ->
{color:#d04437}try to lock{color}(LocalBufferPool#availableMemorySegments)
One solution is that {{listener#notifyBufferAvailable}} can be called outside
the {{synchronized(availableMemorySegments) in
}}{{LocalBufferPool#recycle.}}{{}}
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