| 30 Mar 2026 |
 eveeifyeve | * Eelco: It's really interesting looking through the movement on NaN canonicalization wasm issue for builtins.wasm pr, I am not too exactly some runtimes choose to make it required and some don't from what I was reading. It might be a good to get some idea from the wasm developers, if it's not required, The question is what is it's use when some languages like nix don't deal with floating points often? Like are we expected to handle or ignore these? | 13:18:17 |
| 31 Mar 2026 |
|  Pleune changed their display name from mitchpleune to Pleune. | 02:01:16 |
 Vladimír Čunát | I noticed when looking around Hydra that now tests.nix-copy very often fails, even on multiple older Nix branches, e.g. https://hydra.nixos.org/build/325164327#tabs-buildsteps | 07:04:53 |
| Vladimír Čunát | * I noticed when looking around Hydra that now tests.nix-copy very often fails, even on multiple older Nix branches, e.g. https://hydra.nixos.org/build/325164327#tabs-buildsteps or https://hydra.nixos.org/build/325166328 | 07:05:40 |
 Sergei Zimmerman (xokdvium) | I’ve seen a lot of nixosTests timing out because backdoor service doesn’t spin up or something along those lines. It seems like something borked with vm tests machinery | 08:15:32 |
| Sergei Zimmerman (xokdvium) | In nix-copy specifically I think we just lack some synchronisation between server/client | 08:18:18 |
| Sergei Zimmerman (xokdvium) | This seems like a smoking gun:
client: waiting for Password: to appear on screen
server # [ 356.772255] sshd[897]: Timeout before authentication for connection from 2001:db8:1::1 to 2001:db8:1::2, pid = 1023
| 08:30:38 |
 Jens Petersen | I am getting this warning/error on Fedora with nix-2.34:
warning: unable to download 'https://channels.nixos.org/flake-registry.json': Problem with the SSL CA cert (path? access rights?) (77) error adding trust anchors from file: ; using cached version
Any ideas? (nix-2.33 seems okay) | 10:00:16 |
| Sergei Zimmerman (xokdvium) | Hm, that’s with the release binaries, right? Wonder why the path is empty | 10:43:38 |
| Jens Petersen | Sergei Zimmerman (xokdvium): no it is a fedora build | 11:15:45 |
| Jens Petersen | Okay thanks Sergei Zimmerman (xokdvium) - seems i need to set ssl-cert-file now | 11:29:57 |
| Sergei Zimmerman (xokdvium) | For onlookers, Jens shared that fedora 44 is removing the default PEM certs https://fedoraproject.org/wiki/Changes/droppingOfCertPemFile | 11:42:22 |
| Sergei Zimmerman (xokdvium) | Not a nix change | 11:42:55 |
|  caverav joined the room. | 18:24:06 |
| 1 Apr 2026 |
| caverav set a profile picture. | 00:27:04 |
|  Azad Satkarni changed their display name from 7karni to Azad Satkarni. | 06:40:40 |
 dramforever | so if i have multiple nix processes on the same --store that each may build stuff and/or run gc, are these supposed to be synchronized? | 15:17:05 |
| dramforever | i've been playing around with gc races and i'm getting all sorts of exciting errors by doing this, even with https://github.com/NixOS/nix/pull/15469 applied | 15:17:36 |
| dramforever | the recipe:
- run two of
while nix -vvv --min-free 512T --no-auto-optimise-store --store teststore/ build --no-link nixpkgs#pkgsCross.riscv64.hello ; do : ; done
- run one of
while nix -vvv --min-free 512T --no-auto-optimise-store --store teststore/ store gc; do : ; done
put them each in a tmux pane and watch the chaos unfold
| 15:21:30 |
| dramforever | * the recipe:
- run two of
while nix -vvv --min-free 512T --no-auto-optimise-store --store teststore/ build --no-link nixpkgs#pkgsCross.riscv64.hello ; do : ; done
- run one of
while nix -vvv --min-free 512T --no-auto-optimise-store --store teststore/ store gc; do : ; done
put them each in a tmux pane and watch the chaos unfold
| 15:21:37 |
| Sergei Zimmerman (xokdvium) | In reply to @dramforever:matrix.org
so if i have multiple nix processes on the same --store that each may build stuff and/or run gc, are these supposed to be synchronized? Yeah that’s the idea. What’s exactly breaking? | 15:30:53 |
| Sergei Zimmerman (xokdvium) | Pathlocks being messed up? | 15:31:48 |
| dramforever | so firstly if the autogc thread is still running when the main thread exits the logger crashes. i've hacked this https://fars.ee/b2go to make it less likely to crash | 15:35:31 |
| dramforever | and secondly... uh, readdir is not thread safe | 15:35:41 |
| Sergei Zimmerman (xokdvium) | Hm where are we doing readdir on the same fd? | 15:36:08 |
| Sergei Zimmerman (xokdvium) | * Hm where are we doing readdir on the same fd from different threads? | 15:36:18 |
| dramforever | oh, it's not thread safe in posix (yet) | 15:36:36 |
| dramforever | but should be fine on glibc, so scratch that | 15:36:43 |
| Sergei Zimmerman (xokdvium) | Hm I did see a crash in runtime roots scanning | 15:39:11 |
| dramforever | secondly i'm getting a sigsegv on this boost::regex_match https://github.com/NixOS/nix/blob/b8b3e37b38d2bcc4a4633bf2c7d67e60603308a6/src/libstore/local-gc.cc#L74 | 15:39:41 |
