Add locks for plugin config to avoid possible race condition.

plugins/bundle/plugin.go

@@ -157,7 +157,10 @@ func (p *Plugin) Reconfigure(ctx context.Context, config interface{}) {
 	// Look for any bundles that have had their config changed, are new, or have been removed
 	newConfig := config.(*Config)
 	newBundles, updatedBundles, deletedBundles := p.configDelta(newConfig)
+
+	p.mtx.Lock()
 	p.config = *newConfig
+	p.mtx.Unlock()
 
 	if len(updatedBundles) == 0 && len(newBundles) == 0 && len(deletedBundles) == 0 {
 		// no relevant config changes
@@ -643,6 +646,8 @@ func (p *Plugin) activate(ctx context.Context, name string, b *bundle.Bundle) er
 }
 
 func (p *Plugin) persistBundle(name string) bool {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
 	bundleSrc := p.config.Bundles[name]
 
 	if bundleSrc == nil {