[Refactor] Move the Linux CI jobs to OSDC runners

[huydhn]

Last of three — the actual fleet move. Everything it depends on is already on main by this point.

before	after
linux.g5.4xlarge.nvidia.gpu	mt-l-x86aavx2-11-41-a10g
linux.g6.4xlarge.experimental.nvidia.gpu	mt-l-x86aavx2-11-41-l4
linux.12xlarge	mt-l-x86iavx512-48-384
linux.4xlarge	mt-l-x86iavx512-16-128

Each pod sits on the same instance the label it replaces resolved to, so GPU model and count are unchanged. linux_job_v2 → v3 comes with it, per job: OSDC rejects a job with no container. The lint jobs set no runner: at all and were silently taking v2's linux.2xlarge default — now pinned explicitly.

Images. On OSDC the checkout runs inside the job container and no stock nvidia/cuda ships git, so 42 jobs move to the ghcr.io/pytorch/test-infra/osdc-cuda images — the same bases plus git.

Two exceptions. unittests-robohive keeps nvidia/cudagl:11.4.0-base, the only image with the EGL stack it renders with, so it runs standalone with an explicit git install. unittests-isaaclab stays on EC2 — it calls a fork's reusable workflow that cannot be confirmed to set a container.

docs.yml is #4524; wheel builds are #4487. Supersedes #4486.

Authored with Claude Code.

[pytorch-bot]

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❌ 4 New Failures, 2 Unrelated Failures

As of commit c1cfb1a with merge base 3a13e5f ():

NEW FAILURES - The following jobs have failed:

• Examples Tests on Linux / tests (3.12, 13.0, 1) / linux-job (gh)
  AttributeError: module 'ray.internal' has no attribute 'free'
• Examples Tests on Linux / tests (3.12, 13.0, 2) / linux-job (gh)
  AttributeError: module 'ray.internal' has no attribute 'free'
• Unit-tests on Linux / tests-cpu (3.10, collectors) / linux-job (gh)
  test/test_collectors.py::TestCollectorStats::test_ray_collector_stats
• Unit-tests on Linux / tests-cpu (3.13, collectors) / linux-job (gh)
  test/test_collectors.py::TestCollectorStats::test_ray_collector_stats

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Unit-tests on Linux / tests-gpu-distributed (3.12, 13.0) / linux-job (gh) (similar failure)
  test/test_distributed.py::TestRayCollector::test_ray_collector_policy_constructor

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Linux / tests-stable-gpu-distributed (3.12, 13.0) / linux-job (gh) (trunk failure)
  test/test_distributed.py::TestRayCollector::test_ray_collector_policy_constructor

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[github-actions]

⚠️ PR Title Label Error

PR title must start with a label prefix in brackets (e.g., [BugFix]).

Current title: osdc/runners

Supported Prefixes (case-sensitive)

Your PR title must start with exactly one of these prefixes:

Prefix	Label Applied	Example
[Algorithm]	new algo	[Algorithm] Add new RL objective
[BE]	BE	[BE] Improve error messages
[Benchmark] or [Benchmarks]	Benchmarks	[Benchmark] Add collector benchmark
[BugFix]	BugFix	[BugFix] Fix memory leak in collector
[Example] or [Examples]	Examples	[Example] Add training script
[Feature]	Feature	[Feature] Add new optimizer
[Doc] or [Docs]	Documentation	[Doc] Update installation guide
[Refactor]	Refactoring	[Refactor] Clean up module imports
[CI]	CI	[CI] Fix workflow permissions
[Test] or [Tests]	Tests	[Tests] Add unit tests for buffer
[Trainer] or [Trainers]	Trainers	[Trainer] Add trainer config
[Environment] or [Environments]	Environments	[Environments] Add Gymnasium support
[Data]	Data	[Data] Fix replay buffer sampling
[LLM]	llm/	[LLM] Add reward model integration
[Minor]	small change	[Minor] Fix typo in error message
[Performance] or [Perf]	Performance	[Performance] Optimize tensor ops
[BC-Breaking]	bc breaking	[BC-Breaking] Remove deprecated API
[Deprecation]	Deprecation	[Deprecation] Mark old function
[Algorithm] or [Algorithms]	new algo	[Algorithm] Add new objective
[Quality]	Quality	[Quality] Fix typos and add codespell
[Versioning]	versioning	[Versioning] Bump release version
[WIP]	WIP	[WIP] Draft implementation

Note: Common variations like singular/plural are supported (e.g., [Doc] or [Docs]).

[huydhn]

@pytorchbot drci