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It seems that the problem has been misstated because the bug itself masks the problem. When you already have a plugin installed, you cannot dynamically load its update, ever. Normally Jenkins stops you from trying to do so by throwing a RestartRequiredException. Unfortunately when PluginManager.dynamicLoad is checking whether the plugin is already installed, it calls ClassicPluginStrategy.createPluginWrapper which actually unpacks the *.hpi right away, and when on a filesystem with locks, that fails—and the IOException then is reported as if this were the real error, when the error is simply a user misunderstanding.