[jira] [Updated] (FELIX-4560) Unsynchonized access to map can cause infinite loop in UPnP web console plugin

["Valentin Valchev (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Valentin Valchev updated FELIX-4560:
------------------------------------

          Component/s: Web Console
    Affects Version/s: webconsole-upnp-plugin-1.0.2
        Fix Version/s: webconsole-upnp-plugin-1.0.4

> Unsynchonized access to map can cause infinite loop in UPnP web console plugin
> ------------------------------------------------------------------------------
>
>                 Key: FELIX-4560
>                 URL: https://issues.apache.org/jira/browse/FELIX-4560
>             Project: Felix
>          Issue Type: Bug
>          Components: Web Console
>    Affects Versions: webconsole-upnp-plugin-1.0.2
>         Environment: j9 v2.4
>            Reporter: Valentin Valchev
>             Fix For: webconsole-upnp-plugin-1.0.4
>
>
> An infinite loop loop while getting/putting elements in a map can occur in ControlServlet.
> It uses unsynchonized maps to cache UPnP devices and icons. It seems that map implementation might cause the infinite loop, if you access an element, that is concurrently being removed.
> In order to prevent that race condition, the access to the cache must be synchronized properly.
> To reproduce the problem do:
> # run upnp and upnp web console plug-in
> # restart upnp bundle
> # click a few times on "Search for UPnP Devices" button in web console
> The problem usually occurs on slower machines.



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