Profile credential provider crashes SDK on deallocation

[jbelkins]

Describe the bug

The AWS SDK for Swift has a profile credential provider that is built with an implementation from this project:
https://github.com/awslabs/aws-sdk-swift/blob/main/Sources/Core/AWSSDKIdentity/Sources/AWSSDKIdentity/AWSCredentialIdentityResolvers/ProfileAWSCredentialIdentityResolver.swift#L61

This credentials provider does resolve credentials successfully from a profile, but when the credentials provider is deallocated, the CRT credentials provider crashes on EXC_BAD_ACCESS here due to the shutdownCallbackOptions.shutdownCallback property being nil:
https://github.com/awslabs/aws-crt-swift/blob/main/Source/AwsCommonRuntimeKit/crt/ShutdownCallbackCore.swift#L61

Here is the Swift snippet that uses the AWSSTS service client to cause the crash:

import AWSSTS
import AWSSDKIdentity

@main
struct GetCallerIdentity {

    static func main() async throws {
        let resolver = try AWSSDKIdentity.ProfileAWSCredentialIdentityResolver(profileName: "donothing")
        let config = try await STSClient.Config(awsCredentialIdentityResolver: resolver)
        let client = STSClient(config: config)
        let input = GetCallerIdentityInput()
        do {
            let output = try await client.getCallerIdentity(input: input)
            let userID = String(describing: output.userId)
            let account = String(describing: output.account)
            print("Request succeeded")
            print("User ID: \(userID)")
            print("Account: \(account)")
        } catch {
            print("Request failed")
            print("Error: \(error)")
        }
    }
}

Here is the ~/.aws/config file, credentials are configured in a separate file:

[default]
region = us-east-1

[profile donothing]
role_arn = arn:aws:iam::1234567890:role/DoNothingRole

Expected Behavior

Credentials provider should deallocate successfully

Current Behavior

Credentials provider crashes as indicated

Reproduction Steps

Run the code above, observe crash after successful profile resolution

Possible Solution

No response

Additional Information/Context

No response

aws-crt-swift version used

0.33.0

Compiler and Version used

Xcode 15.4

Operating System and version

macOS 14.6.1

[jbelkins]

An aws-sdk-swift customer reported a similar crash, that happens on credential provider deallocation.
awslabs/aws-sdk-swift#1714

Of note, the customer defined a profile that assumes a role, similar to what was done above.

[waahm7]

Fixed in https://github.com/awslabs/aws-crt-swift/releases/tag/v0.36.0.

[github-actions]

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