🐛 fix bug when set renewDeadline greater than leaseDuration the control… #1761

yuzp1996 · 2021-12-30T16:46:48Z

fix bug when set renewDeadline greater than leaseDuration the controller will hang and no error will be return

linux-foundation-easycla · 2021-12-30T16:46:51Z

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✅ 于志鹏 (e009b83)

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yuzp1996 · 2021-12-31T02:11:46Z

pkg/manager/internal.go

@@ -634,6 +634,7 @@ func (cm *controllerManager) startLeaderElection(ctx context.Context) (err error
 		ReleaseOnCancel: cm.leaderElectionReleaseOnCancel,
 	})
 	if err != nil {


if err happend the leaderElectionStopped will not close and engageStopProcedure will hang in this code

defer func() { // Cancel leader election only after we waited. It will os.Exit() the app for safety. if cm.resourceLock != nil { // After asking the context to be cancelled, make sure // we wait for the leader stopped channel to be closed, otherwise // we might encounter race conditions between this code // and the event recorder, which is used within leader election code. cm.leaderElectionCancel() <-cm.leaderElectionStopped } }()

so I think when error happened we should close this channel

FillZpp · 2021-12-31T03:20:03Z

@yuzp1996 Yeah, it is a bug here, but not only for the NewLeaderElector error.

The cause of the manager hang during stopping, is the cm.leaderElectionStopped might not be closed. Sometimes the cm.leaderElectionCancel might be nil so it could also panic here. For example it fails to cm.add(cm.cluster) or cm.runnables.Webhooks.Start(cm.internalCtx) in the Start().

        // Cancel leader election only after we waited. It will os.Exit() the app for safety.
        if cm.resourceLock != nil {
	        // After asking the context to be cancelled, make sure
	        // we wait for the leader stopped channel to be closed, otherwise
	        // we might encounter race conditions between this code
	        // and the event recorder, which is used within leader election code.
	        cm.leaderElectionCancel()
	        <-cm.leaderElectionStopped
        }

So it might need to change like this, IMHO

Init leaderElectionStopped only when NewLeaderElector succeeds.
Should check if cm.leaderElectionCancel is nil before cm.leaderElectionCancel() and check if cm.leaderElectionStopped is nil before <-cm.leaderElectionStopped. If so, maybe there is no need to check if cm.resourceLock != nil here any more.

yuzp1996 · 2022-01-03T14:11:56Z

pkg/manager/internal.go

@@ -637,6 +638,10 @@ func (cm *controllerManager) startLeaderElection(ctx context.Context) (err error
 		return err
 	}

+	ctx, cancel := context.WithCancel(context.Background())


Following @FillZpp's suggestion, I changed the location of initialization cm.leaderElectionCancel and cm.leaderElectionStopped. So these values will not be nil if NewLeaderElector succeeds.

When engageStopProcedure needs to check cm.leaderElectionCancel and cm.leaderElectionStopped, it will first check whether they are nil.

I'm not sure if this is correct, if we set the context and cancel here it'll be set in a goroutine which can cause a race condition if the controller closes too quickly.

FillZpp

Mostly LG. Some nits.
/ok-to-test

FillZpp · 2022-01-04T03:13:20Z

pkg/manager/internal.go

+		// we wait for the leader stopped channel to be closed, otherwise
+		// we might encounter race conditions between this code
+		// and the event recorder, which is used within leader election code.
+		if cm.leaderElectionCancel != nil {


It seems you only have to check one of cm.leaderElectionCancel and cm.leaderElectionStopped for now they are assigned at the same place.

Yes but I think maybe checking them individually is safer 😄

FillZpp · 2022-01-04T03:21:16Z

@yuzp1996 And you have to fix the failed job, which you can test locally with make lint.

…ler will hang and no error will be return but actually the error should be throw and exit Signed-off-by: yuzhipeng <yuzp1996@qq.com>

FillZpp · 2022-01-04T06:20:02Z

Thanks for fixing this.
/lgtm
/cc @vincepri @alvaroaleman PTAL

k8s-ci-robot · 2022-01-04T06:20:05Z

@FillZpp: GitHub didn't allow me to request PR reviews from the following users: PTAL.

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In response to this:

Thanks for fixing this.
/lgtm
/cc @vincepri @alvaroaleman PTAL

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vincepri

Why do you want renewDeadline greater than lease duration? The lease should always be greater than its renewal, otherwise you might end up losing leader election which is probably what's happening here.

We could validate that the rule above applies and enforce it when configuring the manager, instead of changing the code around to avoid leader election.

/hold

yuzp1996 · 2022-01-19T23:21:48Z

Yes, I think we have had the validation but when someone set renewDeadline greater than lease duration the whole process will block and does not throw an error.

I don't think this is the correct way to do that so I make some changes to make sure errors can be thrown

FillZpp · 2022-01-20T03:59:55Z

@vincepri As I said above, it is not only caused by renewDeadline greater than lease duration.

Any error occurred between defer engageStopProcedure in controllerManager.Start() and // Start the leader elector process in controllerManager.startLeaderElection(), such as:

Error of cm.add(cm.cluster)
Error of cm.runnables.Webhooks.Start(cm.internalCtx)
Error of cm.runnables.Caches.Start(cm.internalCtx)
Error of cm.runnables.Others.Start(cm.internalCtx)
Error of leaderelection.NewLeaderElector

They will all return error, trigger engageStopProcedure in defer, and finally hang on <-cm.leaderElectionStopped, because the channel will not be closed forever.

FillZpp · 2022-01-25T06:24:30Z

WDYT @vincepri

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/lifecycle stale

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/lifecycle rotten

FillZpp · 2022-05-25T07:44:51Z

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle rotten

vincepri · 2022-09-26T16:41:27Z

Can we add a failing test that covers the above bug first which can help explain and prevent the deadlock above? I cannot reproduce locally, so it'd be good to have a test for this

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yuzp1996 changed the title ~~fix bug when set renewDeadline greater than leaseDuration the control…~~ 🐛 fix bug when set renewDeadline greater than leaseDuration the control… Dec 30, 2021

yuzp1996 force-pushed the master branch from e009b83 to 5302c1f Compare December 31, 2021 02:07

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yuzp1996 closed this Jan 4, 2022

yuzp1996 reopened this Jan 4, 2022

fix bug when set renewDeadline greater than leaseDuration the control…

df792cd

…ler will hang and no error will be return but actually the error should be throw and exit Signed-off-by: yuzhipeng <yuzp1996@qq.com>

yuzp1996 force-pushed the master branch from ef93ca1 to df792cd Compare January 4, 2022 05:16

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Tomasz-Smelcerz-SAP mentioned this pull request Mar 28, 2024

chore: Increase leader election timeout kyma-project/lifecycle-manager#1351

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