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https://issues.apache.org/jira/browse/BEAM-9399?focusedWorklogId=410776&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-410776
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ASF GitHub Bot logged work on BEAM-9399:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 27/Mar/20 02:24
            Start Date: 27/Mar/20 02:24
    Worklog Time Spent: 10m 
      Work Description: aaltay commented on issue #11096: [BEAM-9399] Change 
the redirection of System.err to be a custom PrintStream
URL: https://github.com/apache/beam/pull/11096#issuecomment-604781282
 
 
   retest this please
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 410776)
    Time Spent: 3h 20m  (was: 3h 10m)

> Possible deadlock between DataflowWorkerLoggingHandler and overridden 
> System.err PrintStream
> --------------------------------------------------------------------------------------------
>
>                 Key: BEAM-9399
>                 URL: https://issues.apache.org/jira/browse/BEAM-9399
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-dataflow
>            Reporter: Sam Whittle
>            Assignee: Sam Whittle
>            Priority: Minor
>          Time Spent: 3h 20m
>  Remaining Estimate: 0h
>
> When an exception is encountered in DataflowWorkerLoggingHandler the 
> ErrorManager is used to log the exception.  ErrorManager uses System.err 
> which is overridden to be a PrintStream that writes back into 
> DataflowWorkerLoggingHandler.
> This has the lock ordering DataflowWorkerLoggingHandler -> PrintStream.
> Other logging of System.err has the inverse lock ordering 
> PrintStream->DataflowWorkerLoggingHandler so there is potential for deadlock.
> This is one known cause of the inversion, but any other System.err logs from 
> inside DataflowWorkerLoggingHandler could cause the same issue.
> Proposed fix is to address low-hanging fruit of having ErrorManager output to 
> the original System.err.  A full fix would be to improve our override of 
> System.err to a PrintStream that can detect the locking inversion or possibly 
> we could use the PrintStream mutex in both cases.



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