What causes "csi_plugins insert error: %v" in hashicorp/nomad?

Retry the node registration; Raft-backed writes commonly succeed on retry after transient failure.

csi_plugins insert error: %v

Error message

csi_plugins insert error: %v

What it means

Wraps a memdb Insert failure when writing (creating or updating) a structs.CSIPlugin row during node registration in the state store. The transaction cannot persist the plugin record, so the whole node-upsert transaction rolls back and the Raft write fails.

Source

Thrown at nomad/state/state_store.go:1446

			plug = structs.NewCSIPlugin(info.PluginID, index)
		}

		// the plugin may have been created by the job being updated, in which case
		// this data will not be configured, it's only available to the fingerprint
		// system
		plug.Provider = info.Provider
		plug.Version = info.ProviderVersion

		err = plug.AddPlugin(node.ID, info)
		if err != nil {
			return err
		}

		plug.ModifyIndex = index

		err = txn.Insert(TableCSIPlugins, plug)
		if err != nil {
			return fmt.Errorf("csi_plugins insert error: %v", err)
		}

		return nil
	}

	inUseController := map[string]struct{}{}
	inUseNode := map[string]struct{}{}

	for _, info := range node.CSIControllerPlugins {
		err := upsertFn(info)
		if err != nil {
			return err
		}
		inUseController[info.PluginID] = struct{}{}
	}

	for _, info := range node.CSINodePlugins {
		err := upsertFn(info)

View on GitHub (pinned to 482b49bf1a)

Solutions

Retry the node registration; Raft-backed writes commonly succeed on retry after transient failure.
Inspect the wrapped %v error for the underlying memdb reason and address that root cause.
Ensure sufficient server memory; large plugin tables plus state churn can surface allocator failures.
Upgrade Nomad to a release with CSI state-store fixes if reproducible.

Defensive patterns

Strategy: retry

Try / catch

if err != nil && strings.Contains(err.Error(), "csi_plugins insert error") {
    time.Sleep(backoff)
    return retryNodeRegister(node)
}

Prevention

Provision adequate memory on Nomad servers.
Keep CSI plugin task definitions minimal and healthy.
Patch Nomad promptly; CSI code churns across releases.
Alert on failed Raft writes in server logs.

When it happens

Trigger: upsertCSIPluginsForNode inserting a new or modified CSIPlugin via txn.Insert(TableCSIPlugins, plug); fails on transaction invariants (e.g. inserting after an error) or internal memdb faults.

Common situations: Appears in server logs when a node registers with CSI plugins and the state write fails; usually tied to server-side resource/memory issues or Nomad bugs rather than operator config.

Related errors

AI-assisted analysis of hashicorp/nomad@482b49bf1a (2026-09-04). Data as JSON: /api/errors/5f1c2021d165df92. Report an issue: GitHub.