| 9 May 2026 |
 emily | and obviously I don't know how the new queue runner will handle uploads (maybe John Ericson does) | 20:21:44 |
 hexa | Simon Hauser would know | 20:22:08 |
| emily | it seems like just increasing the number of retries in the Nix config specifically used by the queue runner would likely mitigate this problem in practice for now | 20:22:13 |
| hexa | fair enough | 20:22:29 |
| hexa | let's say 32 instead of 1024 though | 20:22:37 |
 John Ericson | I do agree with that sort of thing | 20:23:49 |
| John Ericson | (well in the CA case, it would be the build trace entry, but I digress :)) | 20:24:04 |
| emily | in the CA case the Darwin builds will be broken 100% of the time so there'll be much less debugging required to find the root cause :P | 20:24:37 |
| John Ericson | no more automatic rewriting in CA soon! :) | 20:26:12 |
| emily | how is that going to work? | 20:26:42 |
| John Ericson | https://github.com/NixOS/nix/pull/15793 see what Artemis has been working on | 20:27:51 |
| John Ericson | (note that the use of the exing protocol vs a new simpler protocol is provisional) | 20:28:07 |
| hexa | how annoying would it be to move the S3 bucket to Europe btw 😆 | 20:28:54 |
| emily | I don't see how this solves every dylib on Darwin encoding its own path? | 20:29:51 |
| emily | "The builder can learn the calculated content-addressed path of one of its outputs before creating others" sounds like it can only prevent breaking cross-output references (and since you usually need to know all paths upfront at ./configure time probably not even then) | 20:30:12 |
| emily | but offtopic, anyway :) | 20:30:14 |
|  @squalus0:matrix.org left the room. | 21:21:39 |
| 10 May 2026 |
 VladimÃr ÄŒunát | In reply to @emilazy:matrix.org
right, okay. I don't know exactly why it happens but I know vcunat has mentioned it happening multiple times before. To me the behavior looked like insufficient deduplication of the situations where different hydra jobs built the same derivation, e.g. on different jobsets. It seemed easy to happen. We're helped by the ratio of job count to build times usually, as the duplication only happens concurrently. And for linux we get helped by the builder pool being small and split along the big-parallel axis, so often the duplicate got scheduled to the same machine and deduplicated locally by nix in there. | 06:27:16 |
|  Marcel joined the room. | 12:45:09 |
| John Ericson | I think we should disable fallback paths | 15:13:06 |
| John Ericson | It seems like this feature is not being helpful at all | 15:13:20 |
| John Ericson | And it would be better to fail or delete the outputs first | 15:13:38 |
 K900 | Problem with delete the outputs is they may be in use | 15:14:09 |
| K900 | Problem with fail is Hydra needs to be smart enough to handle this | 15:14:20 |
| K900 | But ideally yes we should fail | 15:14:25 |
| hexa | not sure who restarted ip2unix on nixos/unstable, but it's stuck on a test | 17:13:30 |
| John Ericson | there will be temp roots if they are in use | 17:13:29 |
| hexa | https://hydra.nixos.org/build/326816958/nixlog/5/tail | 17:13:31 |
| hexa | root 374239 0.0 0.0 638608 18368 ? Ssl May06 2:47 nix-daemon --daemon
root 3020110 0.0 0.0 2137748 27724 ? Ssl 14:32 0:01 \_ nix-daemon 3016813
nixbld13 3022134 0.0 0.0 4568 3376 ? Ss 14:32 0:00 | \_ bash -e /nix/store/l622p70vy8k5sh7y5wizi5f2mic6ynpg-source-stdenv.sh /nix/store/shkw4qm9qcw5sc5n1k5jznc83ny02r39-default-builder.sh
nixbld13 3038056 0.0 0.0 50640 40648 ? S 14:32 0:02 | \_ /nix/store/0r6k8xa2kgqyp3r4v2w7yrb80ma2iawm-python3-3.13.12/bin/python3.13 /nix/store/vn448hbsgbh0ahk1bjv2l16f5lhambiq-meson-1.10.2/bin/meson test --no-rebuild --print-errorlogs --max-lines=1000000 --timeout-multiplier=0
nixbld13 3038254 0.0 0.0 37052 32488 ? Ss 14:32 0:00 | \_ /nix/store/0r6k8xa2kgqyp3r4v2w7yrb80ma2iawm-python3-3.13.12/bin/python3.13 /nix/store/wavm4b318kvk7xqy7qfam86i0r8znz1n-python3.13-pytest-9.0.2/bin/.pytest-wrapped -p no:cacheprovider --ip2unix-path=/build/source/build/ip2unix --libip2unix-path=/build/source/build/libip2unix.so --helper-accept-no-peer-addr=/build/source/build/tests/helpers/helper_accept_no_peer_addr --timeout=60 --systemd-support --systemd-sa-path=/nix/store/9rpism89x6lyjcwzzkp6kana25rs03nn-systemd-260.1/bin/systemd-socket-activate
nixbld13 3038432 0.0 0.0 7436 3088 ? S 14:32 0:00 | \_ /build/source/build/tests/helpers/helper_accept_no_peer_addr
| 17:13:53 |
| John Ericson | reminds me I really want to run all test suites in separate derivations | 17:13:54 |
