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https://issues.apache.org/jira/browse/TS-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234171#comment-13234171
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weijin commented on TS-1158:
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I see the read_from_net and write_to_net_io function also have such mechanism
to prevent the race condition. I read and read it again, but still can not
figure out how the mutex is switched. Can you explain it more detailly, and I
also want to know what is consequences of the race. thanks vvvvery much.
> 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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