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https://issues.apache.org/jira/browse/TS-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234396#comment-13234396
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John Plevyak commented on TS-1158:
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Note that when replacing a mutex, both the new and old mutexes must be held.
Also note that this protection (double checking) is only provided in the
NetProcessor as it is the only Processor whose VC mutexes are switched. Any
virtualization would need to provide the same protection.
> Race on mutex switching for NetVConnections in UnixNetVConnection::mainEvent
> ----------------------------------------------------------------------------
>
> Key: TS-1158
> URL: https://issues.apache.org/jira/browse/TS-1158
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Affects Versions: 3.0.3
> Environment: ALL
> Reporter: John Plevyak
> Assignee: John Plevyak
> Fix For: 3.1.4
>
> Attachments: ts-1158-jp1.patch
>
>
> Because of the way session management works, the vio.mutex must be
> re-verified to be identical to the one the lock was taken on after the lock
> is acquired. Otherwise there is a race when the mutex is switched allowing
> such that the old lock is held while the new lock is in not held.
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