fix(core): Prevent re-entry during workflow activation (#17965)

packages/cli/src/__tests__/active-workflow-manager.test.ts

@@ -148,4 +148,21 @@ describe('ActiveWorkflowManager', () => {
 			);
 		});
 	});
+
+	describe('addActiveWorkflows', () => {
+		test('should prevent concurrent activations', async () => {
+			const getAllActiveIds = jest.spyOn(workflowRepository, 'getAllActiveIds');
+
+			workflowRepository.getAllActiveIds.mockImplementation(
+				async () => await new Promise((resolve) => setTimeout(() => resolve(['workflow-1']), 50)),
+			);
+
+			await Promise.all([
+				activeWorkflowManager.addActiveWorkflows('init'),
+				activeWorkflowManager.addActiveWorkflows('leadershipChange'),
+			]);
+
+			expect(getAllActiveIds).toHaveBeenCalledTimes(1);
+		});
+	});
 });

packages/cli/src/active-workflow-manager.ts

@@ -418,11 +418,20 @@ export class ActiveWorkflowManager {
 		executeErrorWorkflow(workflowData, fullRunData, mode);
 	}
 
+	private isActivationInProgress = false;
+
 	/**
 	 * Register as active in memory all workflows stored as `active`,
 	 * only on instance init or (in multi-main setup) on leadership change.
 	 */
 	async addActiveWorkflows(activationMode: 'init' | 'leadershipChange') {
+		if (this.isActivationInProgress) {
+			this.logger.debug(`Skipping activation - already in progress for mode: ${activationMode}`);
+			return;
+		}
+
+		this.isActivationInProgress = true;
+		try {
 			const dbWorkflowIds = await this.workflowRepository.getAllActiveIds();
 
 			if (dbWorkflowIds.length === 0) return;
@@ -442,6 +451,9 @@ export class ActiveWorkflowManager {
 			}
 
 			this.logger.debug('Finished activating all workflows');
+		} finally {
+			this.isActivationInProgress = false;
+		}
 	}
 
 	private async activateWorkflow(