AWS Lambda无法读取EC2实例列表，如何排查原因？

我遇到了AWS Lambda函数无法读取EC2实例列表的问题，请求帮助排查原因，具体情况如下：

这段代码没有抛出任何错误，仅返回空结果：

import os
import boto3

ec2 = boto3.resource('ec2',region)

for ins in ec2.instances.all():
        ip = ins.private_ip_address
        state_name = ins.state['Name']
        print("ip:{}, state:{}".format(ip, state_name))

CloudWatch也没有任何日志输出。我尝试添加try/catch捕获异常，但没有效果……什么都没有。

Lambda与EC2实例属于同一个VPC，Lambda绑定到私有子网，且与EC2实例使用相同的安全组。

权限模拟器显示分配给Lambda的角色对EC2操作具备正常权限。可能我在配置中遗漏了某些内容，但该如何排查问题？

更新1：完整代码与运行日志 #

为避免混淆，我提供完整代码如下：

import os
import boto3

def get_ec2_instances(region, project, state):
    ec2_instances = []
    ec2 = boto3.resource('ec2', region_name=region)
    
    filters = [
        {
            'Name': 'tag:project',
            'Values': [project]
        },
        {
            'Name': 'instance-state-name',
            'Values': [state]
        }
    ]
    
    for ins in ec2.instances.all():
        ip = ins.private_ip_address
        state_name = ins.state['Name']
        print("ip:{}, state:{}".format(ip, state_name)) // 此处无输出
        
    for instance in ec2.instances.filter(Filters=filters):
        ip = instance.private_ip_address
        state_name = instance.state['Name']
        print("ip:{}, state:{}".format(ip, state_name))
        ec2_instances.append(instance)
    
    return ec2_instances
    
def start_ec2_instance(region, project):
    instances_to_start = get_ec2_instances(region, project, 'stopped')
    instance_state_changed = 0
    for instance in instances_to_start:
        instance.start()
        instance_state_changed += 1
    return instance_state_changed
    
def stop_ec2_instance(region, project):
    instances_to_stop = get_ec2_instances(region, project, "running")
    instance_state_changed = 0
    for instance in instances_to_stop:
        instance.stop()
        instance_state_changed += 1
    return instance_state_changed

def describe_ec2_instances(region, project):
    instances = get_ec2_instances(region, project, "running")
    for instance in instances:
        print("Instance ID: {}, IP: {}, State: {}".format(instance.id, instance.private_ip_address, instance.state['Name']))
        
def lambda_handler(event, context):
    region = os.getenv('REGION', 'eu-central-1')
    project = os.getenv('PROJECT', 'ec2-instance')
    instance_state_changed = 0

    if event.get('action') == 'start':
        instance_state_changed = start_ec2_instance(region, project)
    elif event.get('action') == 'stop':
        instance_state_changed = stop_ec2_instance(region, project)
    elif event.get('action') == 'describe':
        describe_ec2_instances(region, project)
        
    return instance_state_changed

运行函数后得到如下输出：

Test Event Name
Start

Response
{
"errorMessage": "2023-06-16T16:17:37.510Z 75118795-2ffd-46ab-84e6-.... Task timed out after 3.02 seconds"
}

Function Logs
START RequestId: 75118795-2ffd-46ab-84e6-... Version: $LATEST
2023-06-16T16:17:37.510Z 75118795-2ffd-46ab-84e6-... Task timed out after 3.02 seconds

END RequestId: 75118795-2ffd-46ab-84e6-...
REPORT RequestId: 75118795-2ffd-46ab-84e6-... Duration: 3018.80 ms Billed Duration: 3000 ms Memory Size: 128 MB Max Memory Used: 83 MB Init Duration: 293.49 ms

Request ID
75118795-2ffd-46ab-84e6-...

更新2：VPC配置截图 #

内容的提问来源于stack exchange，提问作者Anthony