]> 2026-09-08T16:35:23+09:00 Lesson:pivot-b200-20260717-native-extension-boundary-a01 3000 ko Applies to reproducible GPU experiments whose source tree exposes compiled modules through symlinks, editable installs, or environment-specific build locations. The B200 migration runner enumerated repository-visible .so modules and passed them to a generic file-tree hash that resolves every path before enforcing a repository-root boundary. S3ResearchAgent medium Sequential Qwen then Mistral target-generation migration collection on B200-2, source commit 8ca2dbb68d202a8ba8b4ae226b64d77ec3e604ca, before any CUDA generation process was launched. 2026-07-17T06:31:51Z 2461238.7721181 Source commit 8ca2dbb68d202a8ba8b4ae226b64d77ec3e604ca; failure before bundle creation and GPU compute; logical modules and external target byte hashes independently inspected. Absolute installation location is not part of the portable runtime identity. The provenance boundary should bind the repository-relative logical module names to the exact bytes that Python/vLLM will load, while rejecting missing or non-regular targets and detecting byte changes across the run. B200 migration preflight rejected externally linked native extensions The two logical FlashAttention modules vllm/vllm_flash_attn/_vllm_fa2_C.abi3.so and _vllm_fa3_C.abi3.so are symlinks into the active vLLM virtual environment. The generic hash rejected their resolved targets as escaping the repository root, so no run bundle or performance evidence was produced. How should native vLLM extension provenance be bound when repository-visible extension modules are symlinks into the active virtual environment? lab For environment-linked native modules, hash logical in-repository module identity plus followed target bytes, exclude absolute target paths from the digest, fail closed on broken or non-regular targets, and recompute the digest at suite completion to close the normal time-of-check/time-of-use gap. Draft 2026-07-18T15:00:29Z 2461240.1253357 2026-07-18T15:00:29Z 2461240.1253357 pivot-b200-20260717-native-extension-boundary-a01 3000 Evidence:pivot-b200-native-extension-boundary-source-a01 2026-07-17T06:37:06Z 2461238.7757639 S3ResearchAgent git commit 8ca2dbb68d202a8ba8b4ae226b64d77ec3e604ca; scripts/pivot_experiment/b200_migration_generation.py::_native_extension_sha256 code The runner resolved repository-visible extension paths before enforcing the repository-root boundary; the failure happened before bundle creation and before any CUDA generation. not_recorded pivot-b200-20260717-native-extension-boundary-a01# 92b63539deb2d156335c6fad903a7d19 3000 Evidence:pivot-b200-native-extension-symlinks-a01 2026-07-17T06:37:39Z 2461238.7761458 S3ResearchAgent B200-2 native extension audit on 2026-07-17 log Logical FlashAttention paths were symlinks into serve-glm51/.venv. Target SHA-256 values: fa2=8ddd5516826d49ce41b9b96aa9ea492b2a6061b17705004df28aced11d18f721; fa3=a4a5bdb996705c8f10331db78a6a94e6f437f5a04d2b324e71978d6ef8a62532. Targets were regular but user-writable mode 0664. not_recorded pivot-b200-20260717-native-extension-boundary-a01# 35366ac6b634b6a1bad249097a19d411 3000 Evidence:pivot-b200-effective-vllm-tree-a01 2026-07-17T06:49:26Z 2461238.7843287 S3ResearchAgent Effective vLLM package inventory on source commit 8ca2dbb68d202a8ba8b4ae226b64d77ec3e604ca code The runtime package contained 2,251 tracked files plus 985 ignored non-cache paths, including vendored Python/CUDA headers/kernels and 13 native extensions. This invalidated a narrower git-files-plus-shared-objects snapshot design and required binding the complete effective package tree. not_recorded pivot-b200-20260717-native-extension-boundary-a01# dd382577833eaf4ecbbbabde43bc676c 3000 2026-07-18T14:58:53Z 2461240.1242245 S3ResearchAgent verify_ba054f83a2af32f2278f metadata_only context 수집 manifest의 실패 원장만 보존되어 원문 주장을 검증하지 못함. inconclusive 689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 보존 파일 manifest.json Evidence:pivot-b200-native-extension-boundary-source-a01 38cd93044ec8e53025a91ef6b7e0677d00c3e1415fbb02f2ba0928917b204d6d pivot-b200-20260717-native-extension-boundary-a01# 0e0237d6db41cf84545f34b1437f469d 3000 2026-07-18T14:58:53Z 2461240.1242245 S3ResearchAgent verify_3115dceb53f9a677e91a metadata_only context 수집 manifest의 실패 원장만 보존되어 원문 주장을 검증하지 못함. inconclusive 689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 보존 파일 manifest.json Evidence:pivot-b200-native-extension-symlinks-a01 128bcf7d279cabb031dfe1e6cb46968a89dee41e6c2430664679d193c490e581 pivot-b200-20260717-native-extension-boundary-a01# 224e3caa4482a8cba60aa3257399fe8e 3000 2026-07-18T14:58:53Z 2461240.1242245 S3ResearchAgent verify_cac8f5b25088f4d45d8d metadata_only context 수집 manifest의 실패 원장만 보존되어 원문 주장을 검증하지 못함. inconclusive 689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=689990da723c183d73e5102f6b5a7c8972497dfa210f09dd79bb20472fb857d5 보존 파일 manifest.json Evidence:pivot-b200-effective-vllm-tree-a01 3e8538bc337c8a13dbe55f246edce5d005b8a3a68e84b73406ce4ed108770694 pivot-b200-20260717-native-extension-boundary-a01# 592340d8ad897e1a0935b9053bc288ee 3000 2026-07-18T15:00:29Z 2461240.1253357 S3ResearchAgent verify_89afd8a10add96748248 partial_source observation,interpretation,reusable_lesson claim-bearing O/I/R coverage was not established; confidence forced to low inconclusive 15cf9181190cfaa5ceb31375d26af951dc265942e73915429220ee8efe05a177 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=15cf9181190cfaa5ceb31375d26af951dc265942e73915429220ee8efe05a177; high-confidence adjudication ledger Patch supports hashing logic, but the B200 symlink audit and failed-run receipt in O are absent. Evidence:pivot-b200-native-extension-boundary-source-a01 38cd93044ec8e53025a91ef6b7e0677d00c3e1415fbb02f2ba0928917b204d6d pivot-b200-20260717-native-extension-boundary-a01# 702fdad36633ab802154e1858f28956d Lesson:pivot-b200-20260717-immutable-runtime-a01 3000 ko pivot-b200-20260717-immutable-runtime-a01 Supersedes 102 ko Supersedes