| 12 Jul 2025 |
 Sarah Clark | Disable the hanging tests and you get down to the segfaults. | 21:04:09 |
 Randy Eckenrode | Does anything look weird in the list of images? | 21:04:47 |
| Randy Eckenrode | (In the crash.) | 21:04:50 |
| Randy Eckenrode | Like dylibs from both the system and nixpkgs. | 21:04:59 |
| Sarah Clark | > test/utils/test_nearest_neighbors.py Fatal Python error: Segmentation fault
>
> Thread 0x00000001fc105f00 (most recent call first):
> File "/nix/store/rfzawqrkzf88q46aa16c77l3wrhy6jgq-python3.12-scikit-learn-1.6.1/lib/python3.12/site-packages/sklearn/metrics/_pairwise_distances_reduction/_dispatcher.py", line 293 in compute
> File "/nix/store/rfzawqrkzf88q46aa16c77l3wrhy6jgq-python3.12-scikit-learn-1.6.1/lib/python3.12/site-packages/sklearn/neighbors/_base.py", line Fatal Python error: Segmentation fault
>
> 869/nix/store/0znljckc2qhpsjs033wjc07xzqiysp3g-pytest-check-hook/nix-support/setup-hook: line 23: 74892 Segmentation fault: 11 /nix/store/q54d9qqlb27g2nf9ja4zsa89gl7b3yvm-python3-3.12.11/bin/python3.12 "${flagsArray[@]}"
| 21:17:37 |
| Sarah Clark | Same thread stack trace as before | 21:17:50 |
| Sarah Clark | First part of the packages (only cpython internals after the end of this: | 21:18:10 |
| Sarah Clark | Redacted or Malformed Event | 21:18:12 |
| Sarah Clark | Binary Images:
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| 21:18:39 |
| Randy Eckenrode | I’m going to try building it on my Swift branch, which is using LLVM 20 and has some SDK changes. | 21:25:17 |
| Sarah Clark | I don't know if this matters, but there's two libomp packages listed with different bases | 21:28:18 |
| Sarah Clark | Same UUID | 21:28:33 |
| Randy Eckenrode | Same UUID should be same dylib. Are they at different paths? | 21:29:35 |
| Sarah Clark | No | 21:29:43 |
| Sarah Clark | {
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"arch" : "arm64",
"base" : 4562485248,
"size" : 655360,
"uuid" : "c5c91a03-b2a7-3190-ba30-c18937ab5872",
"path" : "/Volumes/VOLUME/*/libomp.dylib",
"name" : "libomp.dylib"
}, | 21:30:08 |
| Sarah Clark | {
"source" : "P",
"arch" : "arm64",
"base" : 14417756160,
"size" : 655360,
"uuid" : "c5c91a03-b2a7-3190-ba30-c18937ab5872",
"path" : "/Volumes/VOLUME/*/libomp.dylib",
"name" : "libomp.dylib"
}, | 21:30:18 |
| Randy Eckenrode | That * is doing a lot of work. It’s hiding the whole store path. That’s really weird. Is libomp.dylib somehow getting loaded twice? | 21:30:56 |
| Sarah Clark | I'm seeing two copies:
0x10ff20000 - 0x10ffbffff libomp.dylib (*) <c5c91a03-b2a7-3190-ba30-c18937ab5872> /Volumes/VOLUME/*/libomp.dylib
0x35b5d8000 - 0x35b677fff libomp.dylib (*) <c5c91a03-b2a7-3190-ba30-c18937ab5872> /Volumes/VOLUME/*/libomp.dylib
| 21:36:21 |
| Randy Eckenrode | That’s probably the source of the crash. I’ve seen other reports of multiple copies of libomp.dylib causing crashes. | 21:36:54 |
| Sarah Clark | Seeing that mentioned in the pytorch FAISS bug set me to looking for it specifically | 21:37:49 |
| Sarah Clark | This started happening after [f6a3fcca7ed9ce0fa5dc57c90c3947ce476260ce] python312Packages.torch: 2.6.0 -> 2.7.0
| 21:40:16 |
| Sarah Clark | https://github.com/NixOS/nixpkgs/pull/401807 | 21:40:31 |
| Sarah Clark | At least, that's where git-bisect took me when testing gpytorch. | 21:40:54 |
| Randy Eckenrode | Probably the line where it adds llvmPackages.libomp. | 21:41:14 |
| Sarah Clark | I need to bisect a few more packages. | 21:41:15 |
| Randy Eckenrode | That’s new. | 21:41:22 |
| Sarah Clark | Frack | 21:41:33 |
| 13 Jul 2025 |
| Randy Eckenrode | mypy fails to build after the Lix change to build on the same volume as the store when the store is case sensitive | 03:30:28 |
| Randy Eckenrode | https://github.com/python/mypy/blob/db6788868b07fd13bcc8606a165f2ca90a68c76c/mypy/test/testfscache.py#L78-L89 | 03:30:30 |
| Randy Eckenrode | They have a test that fails when Windows or Darwin have a case-sensitive system. | 03:31:09 |
