Non-deterministic continuous integration failure

Description

Traceback (most recent call last):

  File "./misc/output_test.py", line 83, in test_issue_1214

AssertionError: '[0/1] echo a\x1b[K' != '[1/1] echo a\x1b[K\n\x1b[31mred\x1b[0m\n'

- [0/1] echo a

+ [1/1] echo a

red

Contributor guide

Tech stack

cpp

Domain

build systemci 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.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

needs investigation

Prerequisites

basic C++ knowledgefamiliarity with ninja build system

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

40

Research direction

The issue involves a non deterministic test failure in misc/output test.py related to progress output. Refer to the linked PR #1785 for context. The test assertion compares expected output, and the failure shows a mismatch in progress numbers and ANSI escape codes. Investigate the test file and the logic producing the output to identify the race condition or order dependency. Consider if the issue is resolved by the changes in PR #1785.