010a127314
The resource quota controller worker pool can deadlock when: * Worker goroutines are idle waiting for work from queues * The Sync() method detects discovery updates to apply The problem is workers acquire a read lock while idle, making write lock acquisition dependent upon the presence of work in the queues. The Sync() method blocks on a pending write lock acquisition and won't unblock until every existing worker processes one item from their queue and releases their read lock. While the Sync() method's lock is pending, all new read lock acquisitions will block; if a worker does process work and release its lock, it will then become blocked on a read lock acquisition; they become blocked on Sync(). This can easily deadlock all the workers processing from one queue while any workers on the other queue remain blocked waiting for work. Fix the deadlock by refactoring workers to acquire a read lock *after* work is popped from the queue. This allows writers to get locks while workers are idle, while preserving the worker pause semantics necessary to allow safe sync. |
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Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
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$ cd $GOPATH/src/k8s.io/kubernetes
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