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Nix Hackers

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For people hacking on the Nix package manager itself190 Servers

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4 Oct 2025
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)Trying to repro with sanitizers, but not much luck yet. Seems to be fucky UB.21:35:54
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)I think I've run into a very fucky store path corruption as well while dogfooding master. Must be the same root cause21:47:58
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)Or was it https://github.com/NixOS/nix/pull/14022/commits maybe?22:12:01
@xokdvium:matrix.orgSergei Zimmerman (xokdvium) Alternate theory. There's UB somewhere in the code base and with the switch to -fno-semantic-interposition GCC is happily optimising the heck out of things. 23:42:23
5 Oct 2025
@joerg:thalheim.ioMic92 @xokdvium:matrix.org: would that be catched if someone runs nix with ubsan in their hosy daemon? 04:44:34
@joerg:thalheim.ioMic92 Sergei Zimmerman (xokdvium): https://github.com/NixOS/nix/pull/14155 05:31:15

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