René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Assertion '!awake.empty()' failed in void nix::Worker::run()","articleBody":"## Describe the bug\n\nWhile doing a `nixos-rebuild build -I nixos-config=$(pwd)/configuration.nix` on my Ubuntu 24.04 I get the following error:\n\n```\nterminating due to unexpected unrecoverable internal error: Assertion '!awake.empty()' failed in void nix::Worker::run(const nix::Goals&) at ../build/worker.cc:360\nNix crashed. This is a bug. Please report this at https://github.com/NixOS/nix/issues with the following information included:\n\nstd::terminate() called without exception\nStack trace:\n 0# 0x000000000011402E in nix-build\n 1# 0x00000000000C539A in /nix/store/chqq8mpmpyfi9kgsngya71akv5xicn03-gcc-15.2.0-lib/lib/libstdc++.so.6\n 2# std::unexpected() in /nix/store/chqq8mpmpyfi9kgsngya71akv5xicn03-gcc-15.2.0-lib/lib/libstdc++.so.6\n 3# 0x00000000000F949F in /nix/store/qnhccq9ilszgqv7hi4hdxacf00garrpg-nix-util-2.35pre20260504_53ab7375/lib/libnixutil.so.2.35\n 4# __wrap___assert_fail in /nix/store/bhg9w1kgi1kxkd0mgbi2rgj6dh0dca5l-nix-store-2.35pre20260504_53ab7375/lib/libnixstore.so.2.35\n 5# 0x00000000000DFC8F in /nix/store/bhg9w1kgi1kxkd0mgbi2rgj6dh0dca5l-nix-store-2.35pre20260504_53ab7375/lib/libnixstore.so.2.35\n 6# nix::Store::buildPaths(std::vector\u003cnix::DerivedPath, std::allocator\u003cnix::DerivedPath> > const&, nix::BuildMode, std::shared_ptr\u003cnix::Store>) in /nix/store/bhg9w1kgi1kxkd0mgbi2rgj6dh0dca5l-nix-store-2.35pre20260504_53ab7375/lib/libnixstore.so.2.35\n 7# 0x0000000000206F62 in nix-build\n 8# 0x000000000020C47C in nix-build\n 9# 0x00000000001A043F in nix-build\n10# nix::handleExceptions(std::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar>, std::allocator\u003cchar> > const&, nix::fun\u003cvoid ()>) in /nix/store/qnhccq9ilszgqv7hi4hdxacf00garrpg-nix-util-2.35pre20260504_53ab7375/lib/libnixutil.so.2.35\n11# 0x00000000000E3371 in nix-build\n12# 0x000000000002B285 in /nix/store/57iz36553175g3178pvxjij8z5rcsd4n-glibc-2.42-61/lib/libc.so.6\n13# __libc_start_main in /nix/store/57iz36553175g3178pvxjij8z5rcsd4n-glibc-2.42-61/lib/libc.so.6\n14# 0x00000000000E81E5 in nix-build\n\n/nix/store/178wmr0l7fnpj5348ga33sdcf2sd8xyh-nixos-install/bin/nixos-install: line 289: 3260040 Aborted                    (core dumped) nix-build --out-link \"$outLink\" --store \"$mountPoint\" \"${extraBuildFlags[@]}\" --extra-substituters \"$sub\" '\u003cnixpkgs/nixos>' -A system -I \"nixos-config=$NIXOS_CONFIG\" \"${verbosity[@]}\"\n```\n\n## Steps To Reproduce\n\nNot reproducible on my NixOS machine, only seen on my Ubuntu machine.  I hope the above stack trace is helpful, because I have no good understanding of what is needed to reproduce it.  With the 25.11 release of NixOS it was working.\n\n## Expected behavior\n\nNo crash.\n\n## Metadata\n\nnix-env (Nix) 2.35pre20260504_53ab7375.\nUbuntu 24.04.4 LTS\n\n## Additional context\n\n\u003c!-- Add any other context about the problem here. -->\n\n## Checklist\n\n\u003c!-- make sure this issue is not redundant or obsolete -->\n\n- [ ] checked [latest Nix manual] \\([source])\n- [X] checked [open bug issues and pull requests] for possible duplicates\n\n[latest Nix manual]: https://nix.dev/manual/nix/development/\n[source]: https://github.com/NixOS/nix/tree/master/doc/manual/source\n[open bug issues and pull requests]: https://github.com/NixOS/nix/labels/bug\n\n---\n\nAdd :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).\n","author":{"url":"https://github.com/ahk2","@type":"Person","name":"ahk2"},"datePublished":"2026-06-10T12:09:56Z","url":"https://github.com/NixOS/nix/issues/16005"}