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https://issues.apache.org/jira/browse/PROTON-1538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123743#comment-16123743
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ASF subversion and git services commented on PROTON-1538:
---------------------------------------------------------
Commit 79309b030476f4957f7d8f360d2224ee0850e006 in qpid-proton's branch
refs/heads/master from Clifford Jansen
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=79309b0 ]
PROTON-1538: epoll proactor - prevent out of order rearming of connection file
descriptor
> 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-j-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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