]> 2026-09-08T16:35:30+09:00 Lesson:pivot-b200-20260717-zmq-ipc-path-a01 3000 ko Applies to vLLM, ZeroMQ, multiprocessing, and other Unix-socket runtimes launched from deeply nested workspaces or containers. The runner assigned TMPDIR to a deeply nested per-model directory under the repository-private executable cache. S3ResearchAgent medium Failed B200 migration bundle b200-2-generation-20260717-a02 at source commit fd7f9bdb5817c497996b6c44c233010a743cdb74. 2026-07-17T07:51:53Z 2461238.8276968 a02 decision SHA-256 b8a1ebaed3c48842cd10768235d66ff1985c2cc8d9c20bdfd046ae4db72996f4; Qwen log SHA-256 85237dd99be24c2c20386d96ab756d463b64540eb282bfc45629716b698992fc; no GPU compute process. Filesystem execution safety and IPC lexical path length are separate constraints. A long executable target can be exposed through a short owner-only /tmp symlink alias so socket names stay short while file operations still resolve to the executable private mount. Private executable TMPDIR exceeded the Unix socket path limit The lexical project venv and private vLLM snapshot passed. During Qwen engine initialization, ZMQ rejected its generated ipc path because the Unix sockaddr path exceeded 107 bytes. The suite failed before any GPU compute process or generation record. How can a GPU runner keep temporary files on an executable private mount without exceeding vLLM ZMQ IPC path limits? lab Budget Unix-domain socket path length using the final generated suffix, not only TMPDIR itself. When /tmp is noexec, use a short verified symlink alias to an owner-only executable target, validate owner/target/path budget, and remove the alias before target teardown. Draft 2026-07-18T14:58:55Z 2461240.1242477 2026-07-18T14:58:55Z 2461240.1242477 pivot-b200-20260717-zmq-ipc-path-a01 3000 Evidence:pivot-b200-zmq-ipc-path-failed-bundle-a01 2026-07-17T07:52:17Z 2461238.8279745 S3ResearchAgent b200-2-generation-20260717-a02 decision.json and qwen/generation.log log The append-only a02 bundle is rejected_incomplete. vLLM resolved the pinned offline Qwen model and reached SyncMPClient construction, then ZMQ rejected a TMPDIR-derived IPC name longer than sockaddr_un.sun_path. Immediate GPU process inventory was empty. not_recorded pivot-b200-20260717-zmq-ipc-path-a01# 4b145b0ccf6a6328cbd28ec813375f63 3000 2026-07-18T14:58:54Z 2461240.1242361 S3ResearchAgent verify_129b3d02981e493896b8 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-zmq-ipc-path-failed-bundle-a01 a2e78c058c1f2a1d023419497087e19f36dcca4635543f322326f295b95b6cf5 pivot-b200-20260717-zmq-ipc-path-a01# f9867623127bcd626c08782ecd72c721 3000 2026-07-18T14:58:54Z 2461240.1242361 S3ResearchAgent verify_49c44484cfcec0cc6967 partial_source observation,interpretation,reusable_lesson claim-bearing O/I/R coverage was not established; confidence forced to low inconclusive 3f9e5ead5ed5fc013af66b880fce71fc15258a79ea855b18e3473ca721b08df9 R2-RESTIC:7f893ca5afd2cfb6fe320e9b61063ccc70e75a7a96589420038c8cf338b273be; archive-manifest-sha256=e28171fb69e141ce306d92dfe4b10e6cdc6e81d4fa910c30a846204dbcf8edf8; sha256=3f9e5ead5ed5fc013af66b880fce71fc15258a79ea855b18e3473ca721b08df9; high-confidence adjudication ledger Patch supports the follow-up path fix, but the cited a02 decision and generation log are absent. Evidence:pivot-b200-zmq-ipc-path-failed-bundle-a01 a2e78c058c1f2a1d023419497087e19f36dcca4635543f322326f295b95b6cf5 pivot-b200-20260717-zmq-ipc-path-a01# 902bc82979d2f2a562606c498fa2d319 Lesson:bind only vllm rpc sockets to a short private path 4bf9d75f 3000 ko bind only vllm rpc sockets to a short private path 4bf9d75f Supersedes 102 ko Supersedes