!VRULIdgoKmKPzJZzjj:nixos.org

Nix Hackers

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For people hacking on the Nix package manager itself191 Servers

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20 Mar 2025
@jade_:matrix.orgjade_ (and it does not seem like it can be trivially changed to recursive hash mode there, since that breaks a bunch of observable behaviour. i have no idea how this is supposed to behave, but it seems like a really quite large bug) 19:01:44
@jade_:matrix.orgjade_ * (and it does not seem like it can be trivially changed to recursive hash mode there, since that breaks a bunch of observable behaviour. i have no idea how this is supposed to behave, but it seems like a really quite tricky bug) 19:01:50
@jade_:matrix.orgjade_ okay update: i can confirm that nixos/nix master emits that 9hagx path into the store and then additionally gets the q9prs one 21:56:28
@jade_:matrix.orgjade_ * okay update: i can confirm that nixos/nix master emits that 9hagx path into the store and then additionally makes the q9prs one 21:56:33
@jade_:matrix.orgjade_ that seems at least inefficient if the files are large 21:56:41
@jade_:matrix.orgjade_

repro:

builtins.fetchTree {
  narHash = "sha256-WmkitUnTwTCCdq0a08EdUBC/UTo/i4+xwD3mk19NA1Q=";
  type = "file";
  url = "https://releases.lix.systems/lix/lix-2.90.0/manifest.nix";
}
21:57:01
@jade_:matrix.orgjade_found some bonus context: https://github.com/NixOS/nix/pull/6548#discussion_r87792175623:09:50
@hexa:lossy.networkhexathe builders are returning to nix 2.24.12 tonight23:24:13
@hexa:lossy.networkhexathe version on nixos-24.1123:24:32
@jade_:matrix.orgjade_wow. i can change it to recursive and it passes tests? absurd.23:26:21
@jade_:matrix.orgjade_that should not be possible. our tests clearly don't work if that's true23:26:38
@jade_:matrix.orgjade_explains the bug though :/23:26:53
@jade_:matrix.orgjade_(i broke tests by writing code that was wrong, but once i fixed my code, it passed, which, aaaaa)23:29:27
21 Mar 2025
@orzklv:floss.uz@orzklv:floss.uz joined the room.00:24:35
@jade_:matrix.orgjade_fix on the lix side https://gerrit.lix.systems/c/lix/+/286400:24:52
@jade_:matrix.orgjade_if nothing else please steal my tests00:25:02
@jade_:matrix.orgjade_* if nothing else please feel free to take my tests00:25:09
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@hexa:lossy.networkhexamost likely https://github.com/NixOS/nix/issues/894615:13:31
@hexa:lossy.networkhexawe've seen like 500 coredumps since last night15:13:48
22 Mar 2025
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@Ericson2314:matrix.orgJohn Ericson
In reply to @hexa:lossy.network
we've seen like 500 coredumps since last night
@hexa:lossy.network: wow ok, so that's a ton of coredumps, definitely the bug is back. What is the baseline rate?
18:56:17
@hexa:lossy.networkhexareally depends on how busy hydra is18:57:17
@hexa:lossy.networkhexabut this was half a day's worth18:57:34
@Ericson2314:matrix.orgJohn Ericson @joerg:thalheim.io @picnoir:alternativebit.fr @jade_:matrix.org: thank you all for investigating this 19:00:30
@Ericson2314:matrix.orgJohn Ericson(I see the PR now)19:00:38
@icarus_dh:matrix.org@icarus_dh:matrix.org removed their profile picture.21:48:13
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