Sync may got dead lock

[mumutu66]

when using both gitsync and gitops in one docker container I always got stuck after certain times sync , I explore the code and find the lock is hold by clusterCache.processEvent then clusterCache.GetManagedLiveObjs in engine.Sync would be locked forever

since there is a timer to notify to get the sync state the resUpdated channel is useless..and remove the OnResourceUpdated in Sync function and everything goes well .

unfortunately I didn't find the root cause..

[alswl]

The clusterCache.EnsureSycned holds the c.lock, and sync() in the EnsureSynced() will accquire listSemaphore. And the watchEvents() goroutine in sync() will accquire semaphore first, then lock the c.lock in RunSynced. so dead locks happened.

I wish I explained the situation clearly.