Concurrent SES and DynamoDB use in Lambda causes Fatal error: Tls Context failed to create.

[mgacy]

Describe the bug

Attempting to send an email using AWSSES and put an item with AWSDynamoDB concurrently in an AWS Lambda causes a crash from Fatal error: Tls Context failed to create.

Expected Behavior

The SDK does not crash

Current Behavior

The SDK crashes with the following message from the Lambda's CloudWatch logs:

ClientRuntime/SDKDefaultIO.swift:70: Fatal error: Tls Context failed to create. This should never happen.Please open a
Github issue with us at https://github.com/awslabs/aws-sdk-swift.
RequestId: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Error: Runtime exited with error: signal: trace/breakpoint trap Runtime.ExitError

Reproduction Steps

I have a full example with a SAM template at https://github.com/mgacy/aws-sdk-crash; the function code is:

import AWSDynamoDB
import AWSLambdaEvents
import AWSLambdaRuntime
import AWSSES
import Foundation

@main
struct ExampleLambda: SimpleLambdaHandler {
    func handle(_ event: APIGatewayV2Request, context: LambdaContext) async throws -> APIGatewayV2Response {
        context.logger.info("RECEIVED: \(event)")

        async let putResponse = try await persistItem("us-east-1", tableName: "Test")
        async let emailResponse = try await sendEmail(to: "[email protected]", from: "[email protected]")
        let (putOutput, emailOutput) = try await (putResponse, emailResponse)
        context.logger.info("SAVED: \(putOutput) and SENT: \(emailOutput)")

        return APIGatewayV2Response(statusCode: .ok)
    }
}

extension ExampleLambda {
    func sendEmail(to recipient: String, from sender: String) async throws -> SendEmailOutputResponse {
        let sesClient = try await SESClient()
        let email = SendEmailInput(
            destination: SESClientTypes.Destination(toAddresses: [recipient]),
            message: SESClientTypes.Message(
                body: SESClientTypes.Body(text: SESClientTypes.Content(data: "Test")),
                subject: SESClientTypes.Content(data: "Testing ...")),
            replyToAddresses: nil,
            returnPath: nil,
            source: sender
        )
        return try await sesClient.sendEmail(input: email)
    }

    func persistItem(_ region: String, tableName: String) async throws -> PutItemOutputResponse {
        let dbClient = try DynamoDBClient(region: region)
        let item: [String: DynamoDBClientTypes.AttributeValue] = [
            "CreatedAt": .s(ISO8601DateFormatter().string(from: Date()))
        ]
        return try await dbClient.putItem(input: PutItemInput(
            item: item,
            tableName: tableName))
    }
}

Possible Solution

N/A

Additional Information/Context

The function is using runtime version: provided:al2.v20

AWS SWIFT SDK version used

0.22.0

Compiler and Version used

Swift 5.7

Operating System and version

Built for arm64 using the swift:5.7-amazonlinux2 image

[jbelkins]

Thanks for your report. We'll investigate, and we'll get back to you if we need more info or resolve the problem.

[sichanyoo]

Error is thrown in aws-crt-swift during TLSContext construction. Needs further investigation from CRT side.

[dayaffe]

Being tracked in CRT awslabs/aws-crt-swift#197

[sichanyoo]

@mgacy

We've added a way to change log levels for CRT (one of our dependency which is where the error is being thrown from) as part of 0.35.0 release of aws-sdk-swift. We need trace level logs to determine what the specific issue is.

Could you call this method once at application start to set the CRT log level to .trace and post the entirety of the logs in this thread?

Please delete / censor out any personal information like credentials, etc. from the logs before posting.

[sichanyoo]

Closing this ticket as it has seen no customer interaction and has gone stale.