Sometimes, attempting to run lambdas will return this type of error:
```
{"Type": "Server", "message": "Error executing Lambda function arn:aws:lambda:ap-northeast-1:000000000000:function:service-stage-functionName: An error occurred (ResourceAlreadyExistsException) when calling the CreateLogGroup operation: The specified log group already exists Traceback (most recent call last):\n 
File \"/opt/code/localstack/localstack/services/awslambda/lambda_api.py\", line 338, in run_lambda\n 
event, context=context, version=version, asynchronous=asynchronous)\n 
File \"/opt/code/localstack/localstack/services/awslambda/lambda_executors.py\", line 81, in execute\n 
return do_execute()\n File \"/opt/code/localstack/localstack/services/awslambda/lambda_executors.py\", line 70, in do_execute\n self._store_logs(func_details, log_output, invocation_time)\n 
File \"/opt/code/localstack/localstack/services/awslambda/lambda_executors.py\", line 105, in _store_logs\n logs_client.create_log_group(logGroupName=log_group_name)\n 
File \"/opt/code/localstack/.venv/lib/python3.6/site-packages/botocore/client.py\", line 357, in _api_call\n 
return self._make_api_call(operation_name, kwargs)\n 
File \"/opt/code/localstack/.venv/lib/python3.6/site-packages/botocore/client.py\", line 661, in _make_api_call\n 
raise error_class(parsed_response, operation_name)\n
botocore.errorfactory.ResourceAlreadyExistsException: An error occurred (ResourceAlreadyExistsException) when calling the CreateLogGroup operation: The specified log group already exists\n", "__type": "InternalFailure"}
```
I am not yet sure if there are any particular settings that cause it, since it does not occur for certain deployments.

Will update if I can figure out the exact configuration.
import sys
import logging
import traceback
import six
from moto.s3 import models as s3_models
from moto.iam import models as iam_models
from moto.sqs import models as sqs_models
from moto.core import BaseModel
from moto.server import main as moto_main
from moto.dynamodb import models as dynamodb_models
from moto.dynamodb2 import models as dynamodb2_models
from moto.awslambda import models as lambda_models
from moto.apigateway import models as apigw_models
from moto.cloudformation import parsing, responses
from boto.cloudformation.stack import Output
from moto.cloudformation.exceptions import ValidationError, UnformattedGetAttTemplateException
from localstack import config
from localstack.constants import DEFAULT_PORT_CLOUDFORMATION_BACKEND, TEST_AWS_ACCOUNT_ID, MOTO_ACCOUNT_ID
from localstack.utils.aws import aws_stack
from localstack.utils.common import FuncThread, short_uid, recurse_object, clone, json_safe
from localstack.stepfunctions import models as sfn_models
from localstack.services.infra import (
    get_service_protocol, start_proxy_for_service, do_run, canonicalize_api_names)
from localstack.utils.bootstrap import setup_logging
from localstack.utils.cloudformation import template_deployer
from localstack.services.cloudformation import service_models