prevent dependencies from being added after stop #1898
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A Nomad user reported an issue where `View.poll` goroutines were being leaked when using large templates. When the runner's `Run` method is in-flight and the runner concurrently receives `Stop`, it's possible for the watcher to stop dependencies via stop and then immediately recreate them. Because the `Stop` method has returned, the caller will assume that all goroutines have been stopped, and this causes the `View.poll` goroutines to be leaked. The race condition for this case is very narrow, but is most likely to occur when the user has both a very large number of dependencies, short secret leases, and the `Wait` configuration is nil. Add a `stopped` flag to the `Watcher` which is set on `Stop`, and check whether this field has been set before adding a new dependency.
shoenig
reviewed
Mar 19, 2024
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Released in 0.37.4. Updated in Nomad here: hashicorp/nomad#20234 |
This was referenced Apr 4, 2024
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A Nomad user reported an issue where
View.pollgoroutines were being leaked when using large templates. When the runner'sRunmethod is in-flight and the runner concurrently receivesStop, it's possible for the watcher to stop dependencies via stop and then immediately recreate them. Because theStopmethod has returned, the caller will assume that all goroutines have been stopped, and this causes theView.pollgoroutines to be leaked. The race condition for this case is very narrow, but is most likely to occur when the user has both a very large number of dependencies, short secret leases, and theWaitconfiguration is nil.Add a
stoppedflag to theWatcherwhich is set onStop, and check whether this field has been set before adding a new dependency.Ref: hashicorp/nomad#20163