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Nix Package Manager development

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For people hacking on Nix: https://github.com/NixOS/nix Nix maintainers can be reached here.179 Servers

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7 Oct 2025
@lovesegfault:matrix.orglovesegfault woke up to Crashes : 370949 [unique: 78, blocklist: 0, verified: 67] 14:40:05
@lovesegfault:matrix.orglovesegfault:D 14:40:08
@lovesegfault:matrix.orglovesegfaultit's weird, the honggfuzz session stalls at ~4% coverage, but found a lot of unique crashes. the afl++ session gets up to >16% coverage, but finds no crashes whatsoever 😵‍💫16:18:59
@lovesegfault:matrix.orglovesegfaulti wonder what's up 16:19:07
@lovesegfault:matrix.orglovesegfaultoh, afl++ found one!16:39:08
@fzakaria:one.ems.hostfzakariaoh really ?18:56:34
@fzakaria:one.ems.hostfzakaria are you running nix eval ? Or you hooked it up individually with a harness 18:56:50
@fzakaria:one.ems.hostfzakariamy laptop was going too slow18:57:37
@lovesegfault:matrix.orglovesegfaulti hooked it up with a harness19:00:05
@lovesegfault:matrix.orglovesegfaulti'll make a draft pr in a bit 19:00:11
@lovesegfault:matrix.orglovesegfaulthttps://github.com/NixOS/nix/pull/1417519:27:22
@fzakaria:one.ems.hostfzakariathat makes sense so it goes faster19:51:47
@fzakaria:one.ems.hostfzakariai just wasn't sure if i would "reset it" correctly19:51:53
@fzakaria:one.ems.hostfzakariadid you give it a dictionary?19:53:11
@lovesegfault:matrix.orglovesegfaulti did not19:54:37
@fzakaria:one.ems.hostfzakariaI saw you could; the bash.dict in AFL++ is a good example. That PR is pretty slick; I don't understand yet the N fuzzers but must be a feature with harness i'm not familiar with19:56:27
@lovesegfault:matrix.orglovesegfaulti took it from this: https://aflplus.plus/docs/fuzzing_in_depth/#c-using-multiple-cores19:58:01
@fzakaria:one.ems.hostfzakariaafl-tmin is pretty cool too.19:58:09
@lovesegfault:matrix.orglovesegfaulti'm trying out a dictionary, let's see19:58:19
@fzakaria:one.ems.hostfzakaria(even minimizes without a crash to give you same coverage)19:58:25
@fzakaria:one.ems.hostfzakariathe sweet of tools is insane19:58:57
@fzakaria:one.ems.hostfzakarialike https://aflplus.plus/docs/technical_details/#13-the-afl-analyze-tool19:59:24
@lovesegfault:matrix.orglovesegfault i wonder if i need each secondary fuzzer to get passed -x as well 20:00:15
@fzakaria:one.ems.hostfzakariahere is my dumb (I wanted to learn it) post https://fzakaria.com/2025/10/07/fuzzing-for-fun-and-profit20:00:16
@fzakaria:one.ems.hostfzakaria might be cool to look at queue and have AFL try to do nix build; see what interesting derivations it comes up with :P 20:01:44

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