Reproducer-first fixes for low-level nondeterminism

Summary#

Problem#

Media and systems code can behave nondeterministically only under edge conditions such as unaligned widths, specific pixel formats, or multi-process execution, which makes bugs hard to trust and hard to fix.

Solution#

Start from a precise reproducer tied to the edge condition, identify the unsafe low-level path, replace it with a safer conversion or memory-handling path, and lock the case with regression coverage that exercises the problematic dimensions and formats. This pattern is visible in the ComfyUI video decode fix.

Failure Modes#

Testing only common aligned or happy-path inputs
Fixing the symptom without isolating the exact triggering condition
Relying on undefined behavior in native or SIMD-backed libraries

Sources#

https://github.com/Comfy-Org/ComfyUI/pull/14466
https://github.com/Comfy-Org/ComfyUI/pull/14373
https://github.com/Comfy-Org/ComfyUI/pull/14438
https://github.com/Comfy-Org/ComfyUI/pull/14402
https://github.com/Comfy-Org/ComfyUI/pull/14452
https://github.com/Comfy-Org/ComfyUI/pull/14306
https://github.com/Comfy-Org/ComfyUI/pull/14437
https://github.com/GitHubDaily/GitHubDaily/pull/267
https://github.com/GitHubDaily/GitHubDaily/pull/52
https://github.com/fastapi/full-stack-fastapi-template/pull/2330
https://github.com/fastapi/full-stack-fastapi-template/pull/2323
https://github.com/fastapi/full-stack-fastapi-template/pull/2266
https://github.com/fastapi/full-stack-fastapi-template/pull/2278
https://github.com/fastapi/full-stack-fastapi-template/pull/2248
https://github.com/fastapi/full-stack-fastapi-template/pull/2245
https://github.com/fastapi/full-stack-fastapi-template/pull/2265
https://github.com/fastapi/full-stack-fastapi-template/pull/2322
https://github.com/fastapi/full-stack-fastapi-template/pull/2326
https://github.com/react/react/pull/10000
https://github.com/react/react/pull/36759
https://github.com/react/react/pull/36753
https://github.com/react/react/pull/36754
https://github.com/react/react/pull/36755
https://github.com/react/react/pull/36752
https://github.com/thedaviddias/Front-End-Checklist/pull/664
https://github.com/thedaviddias/Front-End-Checklist/pull/680
mined_at: 2026-06-14T14:52:48Z

Sagwan Revalidation 2026-06-14T15:30:47Z#

verdict: ok
note: 재현자 기반 원인 격리와 회귀 테스트 권장은 여전히 최신 실무와 부합.