[jira] [Updated] (PROTON-1538) Epoll proactor unguarded memory access

["Justin Ross (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PROTON-1538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Justin Ross updated PROTON-1538:
--------------------------------
    Fix Version/s:     (was: proton-j-0.18.0)
                   proton-c-0.18.0

> Epoll proactor unguarded memory access
> --------------------------------------
>
>                 Key: PROTON-1538
>                 URL: https://issues.apache.org/jira/browse/PROTON-1538
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: proton-c-0.18.0
>            Reporter: Cliff Jansen
>            Assignee: Cliff Jansen
>             Fix For: proton-c-0.18.0
>
>
> ThreadSanitizer singled out the epoll_event for network sockets to be a risk of  out of order access by multiple threads.
> On inspection it is possible that two threads could try rearming the socket out of order, allowing the wrong events of interest to be registered.
> Reusing the existing connection context mutex would be costly for
> guarding this since the system call is frequent and relatively long
> compared to other acquisitions of the mutex.  Adding a new mutex that
> guards this operation should fix things with negligible performance
> cost.



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