verl-project/verl

[Bug][CI] FDSP2 test in `model_rmpad` job seems unstable

Open

#1388 opened on May 4, 2025

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Description

Motivation

https://github.com/volcengine/verl/actions/workflows/model.yml shows that:

  1. the FDSP2 test in model_rmpad workflow fails sometimes;
  2. but can also pass sometimes.

Plan

  • Find a setup that can reproduce the error steadily (possibly using the test container)
  • Locate the root cause
  • Fix the bug

Additional Info.

Contributor guide

Tech stack
pythondocker
Domain
testingdevopsci cd
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Pythonunderstanding of CI workflowstest debugging
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
First, reproduce the flaky FDSP2 test in the model rmpad job locally using the test container as mentioned in the CI workflow. Inspect logs from successful and failed runs to identify differences. Look at the related PR (#1026) for context. Examine the test code for timing dependencies or race conditions. Check if the failure is environment specific (e.g., GPU or resource contention).