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deployments: fix data races (#14121) 

* deployments: fix data races

Both priority and state related fields may be mutated concurrently and
need to be accessed with the lock acquired.
This commit is contained in:
Michael Schurter 2022-08-16 10:50:40 -07:00 committed by GitHub
parent db97e08163
commit 285979e96c
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2 changed files with 8 additions and 1 deletions
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2
nomad/deploymentwatcher/deployment_watcher.go
View File

@ -840,10 +840,12 @@ func (w *deploymentWatcher) getEval() *structs.Evaluation {
// on the previous version that are then "watched" on a leader that's on // on the previous version that are then "watched" on a leader that's on
// the new version. This would result in an eval with its priority set to // the new version. This would result in an eval with its priority set to
// zero which would be bad. This therefore protects against that. // zero which would be bad. This therefore protects against that.
w.l.Lock()
priority := w.d.EvalPriority priority := w.d.EvalPriority
if priority == 0 { if priority == 0 {
priority = w.j.Priority priority = w.j.Priority
} }
w.l.Unlock()
return &structs.Evaluation{ return &structs.Evaluation{
ID: uuid.Generate(), ID: uuid.Generate(),

7
nomad/deploymentwatcher/deployments_watcher.go
View File

@ -193,7 +193,12 @@ func (w *Watcher) watchDeployments(ctx context.Context) {
// getDeploys retrieves all deployments blocking at the given index. // getDeploys retrieves all deployments blocking at the given index.
func (w *Watcher) getDeploys(ctx context.Context, minIndex uint64) ([]*structs.Deployment, uint64, error) { func (w *Watcher) getDeploys(ctx context.Context, minIndex uint64) ([]*structs.Deployment, uint64, error) {
resp, index, err := w.state.BlockingQuery(w.getDeploysImpl, minIndex, ctx) // state can be updated concurrently
w.l.Lock()
stateStore := w.state
w.l.Unlock()
resp, index, err := stateStore.BlockingQuery(w.getDeploysImpl, minIndex, ctx)
if err != nil { if err != nil {
return nil, 0, err return nil, 0, err
} }