Span in Kotlin `withTimeout` has wrong parent

Assessment

This issue has not been assessed yet.

Description

Tracer Version(s)

1.54.0

Java Version(s)

21.0.7

JVM Vendor

Other (please specify in comments)

Bug Report

Hi! I have the following code in a Kotlin Ktor server application, when handling an incoming HTTP request:

post("/foo") {
    span("withTimeoutOutside") {
        delay(100)
        withTimeout(500) {
            span("withTimeoutInside") {
                delay(100)
            }
        }
    }
}

I'd expect the root span (for the HTTP request) to have a child of withTimeoutOutside, which has a child of withTimeoutInside. Instead, what I see is this:

This is possibly related to the fixes put in place for https://github.com/DataDog/dd-trace-java/issues/7215.

Let me know if you need me to provide anything else to help with this.

Thanks in advance!

(Am running on OpenJDK 64-Bit Server VM Temurin-21.0.7+6)

Expected Behavior

I'd expect the root span (for the HTTP request) to have a child of withTimeoutOutside, which has a child of withTimeoutInside.

Reproduction Code

No response

Contributor guide

Open the contributing guide

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

More from DataDog/dd-trace-java

• Update DEFAULT_HTTP_CLIENT_ERROR_STATUSES to include 5xx status codes Open
  type: feature request

  Difficulty 1/5 1-3 hours Newbie friendliness 70/100

  DataDog/dd-trace-java#10245 · 1 comment · Opened Dec 18, 2025

• Add http.route support for Spring Cloud Gateway Path predicates Open

  Difficulty 4/5 3-5 days Newbie friendliness 62/100

  DataDog/dd-trace-java#12608 · Opened Sep 23, 2026

• Jakarta-RS scope remains active after Tomcat request completes (TomEE/CXF), eventually exceeding scope depth Open
  type: bug report

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  DataDog/dd-trace-java#12597 · Opened Sep 22, 2026

• Queueing-time profiler aborts the whole instrumentation install under a JDK 24+ AOT cache (zero spans); disabling that one feature is enough Open

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  DataDog/dd-trace-java#12540 · 3 comments · 1 assignee · Opened Sep 16, 2026

• NullPointerException from SnsInterceptor when publishing an SNS batch without a topic ARN Open

  Difficulty 3/5 1-2 days Newbie friendliness 25/100

  DataDog/dd-trace-java#12480 · Opened Sep 13, 2026

All issues in DataDog/dd-trace-java

Similar issues

• Compatibility certification request for FJ-EAP 2.1.0 for Jakarta EE Platform 11 Open
  certification

  Difficulty 1/5 Under an hour Newbie friendliness 80/100

  jakartaee/platform#1359 · Opened Sep 24, 2026

• Python guide test runner copies stale Micronaut Test Resources state Open

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  micronaut-projects/micronaut-guides#1856 · Opened Sep 23, 2026

• [BUG] ECR GetAuthorizationToken returns a proxyEndpoint for the default region, not the request's Open
  bug ecr

  Difficulty 2/5 1-3 hours Newbie friendliness 75/100

  floci-io/floci#4264 · Opened Sep 23, 2026

• Drop point numbers from GitHub milestones Open
  Needs: Triage Type: Feature request

  Difficulty 2/5 1-3 hours Newbie friendliness 70/100

  AntennaPod/AntennaPod#8794 · Opened Sep 23, 2026

• [aw] Issue Classification Agent timed out Open
  agentic-workflows

  Difficulty 2/5 1-3 hours Newbie friendliness 65/100

  github/copilot-sdk#2760 · Opened Sep 23, 2026

More Java issues