Merge pull request #65596 from liggitt/out-of-bounds

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Fix out of bounds error on non-64-bit machines This fixes an out of bounds error when running the controllers on a 32-bit machine ``` W0628 17:52:30.171975 1 node_lifecycle_controller.go:782] Missing timestamp for Node kube-master. Assuming now as a timestamp. I0628 17:52:30.172115 1 taint_manager.go:205] Starting NoExecuteTaintManager panic: runtime error: index out of range goroutine 1740 [running]: k8s.io/kubernetes/pkg/controller/nodelifecycle/scheduler.(*NoExecuteTaintManager).Run.func1(0x165e6000, 0x8, 0x15984100) /workspace/anago-v1.11.0-rc.3.3+91e7b4fd31fcd3/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/nodelifecycle/scheduler/taint_manager.go:229 +0x1f8 created by k8s.io/kubernetes/pkg/controller/nodelifecycle/scheduler.(*NoExecuteTaintManager).Run /workspace/anago-v1.11.0-rc.3.3+91e7b4fd31fcd3/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/nodelifecycle/scheduler/taint_manager.go:217 +0x27c ``` See https://play.golang.org/p/rIpicHGHtiT for an example of the coercion overflow /assign @wojtek-t /kind bug ```release-note fixes an out of range panic in the NoExecuteTaintManager controller when running a non-64-bit build ```

Merge pull request #65596 from liggitt/out-of-bounds
85aa6d24 · Kubernetes Submit Queue · GitHub · 8563443a · 52abbeff · 85aa6d24
Unverified Commit 85aa6d24 authored Jun 29, 2018 by Kubernetes Submit Queue Committed by GitHub Jun 29, 2018
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Showing with 6 additions and 6 deletions

taint_manager.go pkg/controller/nodelifecycle/scheduler/taint_manager.go +6 -6

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--- a/pkg/controller/nodelifecycle/scheduler/taint_manager.go
+++ b/pkg/controller/nodelifecycle/scheduler/taint_manager.go
@@ -80,10 +80,10 @@ func (p *podUpdateItem) nodeName() string {
 	return ""
 }

-func hash(val string) int {
+func hash(val string, max int) int {
 	hasher := fnv.New32a()
 	io.WriteString(hasher, val)
-	return int(hasher.Sum32())
+	return int(hasher.Sum32() % uint32(max))
 }

 // NoExecuteTaintManager listens to Taint/Toleration changes and is responsible for removing Pods
@@ -221,12 +221,12 @@ func (tc *NoExecuteTaintManager) Run(stopCh <-chan struct{}) {
 				break
 			}
 			nodeUpdate := item.(*nodeUpdateItem)
-			hash := hash(nodeUpdate.name())
+			hash := hash(nodeUpdate.name(), workers)
 			select {
 			case <-stopCh:
 				tc.nodeUpdateQueue.Done(item)
 				break
-			case tc.nodeUpdateChannels[hash%workers] <- nodeUpdate:
+			case tc.nodeUpdateChannels[hash] <- nodeUpdate:
 			}
 			tc.nodeUpdateQueue.Done(item)
 		}
@@ -239,12 +239,12 @@ func (tc *NoExecuteTaintManager) Run(stopCh <-chan struct{}) {
 				break
 			}
 			podUpdate := item.(*podUpdateItem)
-			hash := hash(podUpdate.nodeName())
+			hash := hash(podUpdate.nodeName(), workers)
 			select {
 			case <-stopCh:
 				tc.podUpdateQueue.Done(item)
 				break
-			case tc.podUpdateChannels[hash%workers] <- podUpdate:
+			case tc.podUpdateChannels[hash] <- podUpdate:
 			}
 			tc.podUpdateQueue.Done(item)
 		}