!VRULIdgoKmKPzJZzjj:nixos.org

Nix Hackers

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For people hacking on the Nix package manager itself185 Servers

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9 Oct 2025
@lovesegfault:matrix.orglovesegfault *

once the above lands, next steps:

  • all builtin fetchurl pre-resolution stuff
  • add the s3 test suite
  • switch the default
  • remove the legacy impl
04:06:45
@lovesegfault:matrix.orglovesegfault

Sergei Zimmerman (xokdvium): https://github.com/NixOS/nix/pull/13752/commits/54e39e890bee16a1062bf33314d32a8cf20ab870

what do you think?

05:22:34
@nullcube:matrix.org@nullcube:matrix.org left the room.10:36:17
@fzakaria:one.ems.hostfzakariai was traveling yesterday16:58:33
@fzakaria:one.ems.hostfzakariawhat happened with all the fuzzing stuf16:58:37
@lovesegfault:matrix.orglovesegfaultit17:14:59
@lovesegfault:matrix.orglovesegfault* it's there, i don't have time to push it across the finish line right now17:15:10
@lovesegfault:matrix.orglovesegfaultit found some crashes17:15:22
@notgne2:wizbos.club@notgne2:wizbos.club left the room.20:19:19
@fzakaria:one.ems.hostfzakariadid you upload the seeds ?21:22:46
@fzakaria:one.ems.hostfzakariai can investigate the crashes21:22:50
@fzakaria:one.ems.hostfzakariathose sound straightforward to create issues for21:23:12
@fzakaria:one.ems.hostfzakariai also have time... maybe Monady we can take it over the finshing line together? It looked sweet21:23:31
@lovesegfault:matrix.orglovesegfaultlet me collect them, one second23:34:53
@lovesegfault:matrix.orglovesegfaultDownload nix-eval-crashes.tar.zst23:36:10
@lovesegfault:matrix.orglovesegfault fzakaria: those are the crashes I got 23:36:19
@fzakaria:one.ems.hostfzakariacool ill take a look23:44:10
@fzakaria:one.ems.hostfzakariamaybe file bugs worst case23:44:14
@fzakaria:one.ems.hostfzakaria(I'll make sure they repro)23:44:22
@fzakaria:one.ems.hostfzakariathey're all kind of similar23:45:52
@fzakaria:one.ems.hostfzakariainteresting23:45:53
@lovesegfault:matrix.orglovesegfaultthe big issue with the current fuzzing work is i cannot seem to get good coverage, even after I added the dictionary, which helped23:54:46
@lovesegfault:matrix.orglovesegfaultand i don't know if it's my fault or of that's just how it is23:54:57
@lovesegfault:matrix.orglovesegfaulti suspect the corpus sucks and needs to be made better23:55:07
10 Oct 2025
@fzakaria:one.ems.hostfzakariamaybe there's more instrumentation to help guide it better?00:02:48
@fzakaria:one.ems.hostfzakariaor yea just feed it tons of derivations00:02:59
@fzakaria:one.ems.hostfzakarialike 1000s00:03:02
@fzakaria:one.ems.hostfzakaria
nix eval -f ./id:000000,sig:11,src:000046,time:6573454,execs:92972154,op:havoc,rep:2 
error: memory exhausted
       at /home/fmzakari/Downloads/nix-eval-crashes/id:000000,sig:11,src:000046,time:6573454,execs:92972154,op:havoc,rep:2:1:9999:
00:03:04
@fzakaria:one.ems.hostfzakaria memory exhausted interesting since it's a bunch of exclamation marks 00:03:31
@fzakaria:one.ems.hostfzakariaRedacted or Malformed Event00:07:49

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