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nix-daemon crash on upgrade from 2.95.1 to 2.95.2 via `nix upgrade-nix` #1207

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opened 2026-05-05 17:32:12 +00:00 by gabeio · 4 comments

gabeio commented

2026-05-05 17:32:12 +00:00

Describe the bug

A clear and concise description of what the bug is.

While running the nix-daemon from lix version 2.95.1 the nix-daemon crashes in the middle of the upgrade.

I will note that I am aware that the nix-daemon needs to be restarted after the update but I never got that far.

If you have a problem with a specific package or NixOS,
you probably want to file an issue at https://github.com/NixOS/nixpkgs/issues.

Steps To Reproduce

2.95.1 installed
try to upgrade (sudo nix upgrade-nix or curl -sSf -L "https://git.lix.systems/lix-project/lix/raw/tag/2.95.1/misc/upgrade-lix.sh" | sudo --preserve-env=PATH bash -s -- 2.95.2)
nix-daemon crashes

the output of the nix upgrade-nix command (in this case using profile default although without is is pretty much exactly the same):

sudo nix upgrade-nix -p /nix/var/nix/profiles/default
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
downloading 'https://releases.lix.systems/manifest.nix'warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
uninstalling 'lix-2.95.1'
performing daemon worker op: 19
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
installing 'lix-2.95.2'
error: cannot open connection to remote store 'daemon': error: stream ended unexpectedly
error: program '/nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix-env' failed with exit code 1

Expected behavior

A clear and concise description of what you expected to happen.

Being able to upgrade? /s

`nix --version` output

nix --version
nix (Lix, like Nix) 2.95.1
System type: aarch64-darwin
Additional system types: x86_64-darwin
Features: gc, signed-caches
System configuration file: /etc/nix/nix.conf
User configuration files: /Users/gabeio/.config/nix/nix.conf:/etc/xdg/nix/nix.conf
Store directory: /nix/store
State directory: /nix/var/nix
Data directory: /nix/store/ylbrql19ngr2wypjiviyx21qvbwpd79z-lix-2.95.1/share

Additional context

Add any other context about the problem here.

I was able to recover my nix profile by using an older generation and trying again which allowed me to get a traceback from nix-daemon (the traceback below is from the nix version above)

sudo /nix/var/nix/profiles/default/bin/nix-daemon --debug
Password:
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
accepted connection from pid 14429
running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14429' '--log-level' '6'
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
remote pid 14429 is unknown user (trusted)
received daemon op 19
accepted connection from pid 14438
running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14438' '--log-level' '6'
warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root')
remote pid 14438 is unknown user (trusted)
received daemon op 19
accepted connection from pid 14442
running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14442' '--log-level' '6'
killing process 14444
error: killing process 14444: No such process
killing process 14444
error: killing process 14444: No such process
Lix crashed. This is a bug. We would appreciate if you report it along with what caused it at https://git.lix.systems/lix-project/lix/issues with the following information included:

Exception: nix::SysError: error: cannot get exit status of PID 14444: No child processes
Stack trace:
 0# nix::getStackTrace() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
 1# nix::logException(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::exception const&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
 2# nix::(anonymous namespace)::onTerminate() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
 3# std::__terminate(void (*)()) in /usr/lib/libc++abi.dylib
 4# std::terminate() in /usr/lib/libc++abi.dylib
 5# kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>::~Own() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
 6# kj::_::Coroutine<boost::outcome_v2::basic_result<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, void>>>::Awaiter<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>> kj::_::Coroutine<boost::outcome_v2::basic_result<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, void>>>::await_transform<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>>(kj::Promise<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>>&&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
 7# nix::daemonLoopForSocket(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, nix::Settings::DaemonSocketPath const&, nix::AutoCloseFD&, std::__1::optional<nix::TrustedFlag>) (.resume) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
 8# non-virtual thunk to kj::_::CoroutineBase::fire() in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib
 9# kj::_::waitImpl(kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>&&, kj::_::ExceptionOrValue&, kj::WaitScope&, kj::SourceLocation)::$_2::operator()() const in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib
10# kj::_::waitImpl(kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>&&, kj::_::ExceptionOrValue&, kj::WaitScope&, kj::SourceLocation) in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib
11# kj::Promise<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>::wait(kj::WaitScope&, kj::SourceLocation) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
12# auto nix::AsyncIoRoot::blockOn<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>(kj::Promise<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>&&, std::__1::source_location) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
13# nix::runDaemon(nix::AsyncIoRoot&, bool, std::__1::optional<nix::TrustedFlag>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
14# nix::main_nix_daemon(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
15# decltype(std::declval<int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>)>()(std::declval<nix::AsyncIoRoot&>(), std::declval<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>(), std::declval<std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>>(), std::declval<std::__1::span<char*, 18446744073709551615ul>>())) std::__1::__invoke[abi:se190102]<int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>), nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>>(int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>), nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&&, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>&&, std::__1::span<char*, 18446744073709551615ul>&&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
16# nix::mainWrapped(nix::AsyncIoRoot&, int, char**) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
17# std::__1::__function::__func<main::$_0, std::__1::allocator<main::$_0>, int ()>::operator()() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix
18# nix::handleExceptions(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::function<int ()>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib
19# main in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix

fish: Job 1, 'sudo /nix/var/nix/profiles/defa…' terminated by signal SIGABRT (Abort)

my workaround:

sudo ln -Ffs /nix/store/vk77mkl9vqnpfwlk875j6b80df37yw01-user-environment /nix/var/nix/profiles/default effectively rolling back the default profile to an older version which was functional and then was able to run the upgrade all the way up.

## Describe the bug A clear and concise description of what the bug is. While running the nix-daemon from lix version 2.95.1 the nix-daemon crashes in the middle of the upgrade. I will note that I am aware that the nix-daemon needs to be restarted _after_ the update but I never got that far. If you have a problem with a specific package or NixOS, you probably want to file an issue at https://github.com/NixOS/nixpkgs/issues. ## Steps To Reproduce 1. 2.95.1 installed 2. try to upgrade (`sudo nix upgrade-nix` or `curl -sSf -L "https://git.lix.systems/lix-project/lix/raw/tag/2.95.1/misc/upgrade-lix.sh" | sudo --preserve-env=PATH bash -s -- 2.95.2`) 3. nix-daemon crashes the output of the nix upgrade-nix command (in this case using `profile` default although without is is pretty much exactly the same): ``` sudo nix upgrade-nix -p /nix/var/nix/profiles/default warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') downloading 'https://releases.lix.systems/manifest.nix'warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') uninstalling 'lix-2.95.1' performing daemon worker op: 19 warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') installing 'lix-2.95.2' error: cannot open connection to remote store 'daemon': error: stream ended unexpectedly error: program '/nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix-env' failed with exit code 1 ``` ## Expected behavior A clear and concise description of what you expected to happen. Being able to upgrade? /s ## `nix --version` output ``` nix --version nix (Lix, like Nix) 2.95.1 System type: aarch64-darwin Additional system types: x86_64-darwin Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /Users/gabeio/.config/nix/nix.conf:/etc/xdg/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/ylbrql19ngr2wypjiviyx21qvbwpd79z-lix-2.95.1/share ``` ## Additional context Add any other context about the problem here. I was able to recover my nix profile by using an older generation and trying again which allowed me to get a traceback from `nix-daemon` (the traceback below is from the nix version above) ``` sudo /nix/var/nix/profiles/default/bin/nix-daemon --debug Password: warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') accepted connection from pid 14429 running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14429' '--log-level' '6' warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') remote pid 14429 is unknown user (trusted) received daemon op 19 accepted connection from pid 14438 running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14438' '--log-level' '6' warning: $HOME ('/Users/gabeio') is not owned by you, falling back to the one defined in the 'passwd' file ('/var/root') remote pid 14438 is unknown user (trusted) received daemon op 19 accepted connection from pid 14442 running command from PATH with explicit argv0: '/nix/var/nix/profiles/default/bin/nix-daemon' 'nix-daemon' '--for' '14442' '--log-level' '6' killing process 14444 error: killing process 14444: No such process killing process 14444 error: killing process 14444: No such process Lix crashed. This is a bug. We would appreciate if you report it along with what caused it at https://git.lix.systems/lix-project/lix/issues with the following information included: Exception: nix::SysError: error: cannot get exit status of PID 14444: No child processes Stack trace: 0# nix::getStackTrace() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 1# nix::logException(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::exception const&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 2# nix::(anonymous namespace)::onTerminate() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 3# std::__terminate(void (*)()) in /usr/lib/libc++abi.dylib 4# std::terminate() in /usr/lib/libc++abi.dylib 5# kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>::~Own() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 6# kj::_::Coroutine<boost::outcome_v2::basic_result<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, void>>>::Awaiter<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>> kj::_::Coroutine<boost::outcome_v2::basic_result<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::pair<int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::exception_ptr, void>>>::await_transform<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>>(kj::Promise<boost::outcome_v2::basic_result<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::exception_ptr, void>>>&&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 7# nix::daemonLoopForSocket(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, nix::Settings::DaemonSocketPath const&, nix::AutoCloseFD&, std::__1::optional<nix::TrustedFlag>) (.resume) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 8# non-virtual thunk to kj::_::CoroutineBase::fire() in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib 9# kj::_::waitImpl(kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>&&, kj::_::ExceptionOrValue&, kj::WaitScope&, kj::SourceLocation)::$_2::operator()() const in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib 10# kj::_::waitImpl(kj::Own<kj::_::PromiseNode, kj::_::PromiseDisposer>&&, kj::_::ExceptionOrValue&, kj::WaitScope&, kj::SourceLocation) in /nix/store/7fdxyll3a301w9wb8sw3mivd64kjhv16-capnproto-1.2.0/lib/libkj-async.1.2.0.dylib 11# kj::Promise<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>::wait(kj::WaitScope&, kj::SourceLocation) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 12# auto nix::AsyncIoRoot::blockOn<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>(kj::Promise<boost::outcome_v2::basic_result<void, std::exception_ptr, boost::outcome_v2::policy::exception_ptr_rethrow<void, std::exception_ptr, void>>>&&, std::__1::source_location) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 13# nix::runDaemon(nix::AsyncIoRoot&, bool, std::__1::optional<nix::TrustedFlag>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 14# nix::main_nix_daemon(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 15# decltype(std::declval<int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>)>()(std::declval<nix::AsyncIoRoot&>(), std::declval<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>(), std::declval<std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>>(), std::declval<std::__1::span<char*, 18446744073709551615ul>>())) std::__1::__invoke[abi:se190102]<int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>), nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>>(int (*&)(nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, std::__1::span<char*, 18446744073709551615ul>), nix::AsyncIoRoot&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&&, std::__1::list<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>&&, std::__1::span<char*, 18446744073709551615ul>&&) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 16# nix::mainWrapped(nix::AsyncIoRoot&, int, char**) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 17# std::__1::__function::__func<main::$_0, std::__1::allocator<main::$_0>, int ()>::operator()() in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix 18# nix::handleExceptions(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::function<int ()>) in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/lib/liblix.dylib 19# main in /nix/store/4dw2mganmnsxy31wyjll1vrn3gp5x345-lix-2.95.2/bin/nix fish: Job 1, 'sudo /nix/var/nix/profiles/defa…' terminated by signal SIGABRT (Abort) ``` my workaround: `sudo ln -Ffs /nix/store/vk77mkl9vqnpfwlk875j6b80df37yw01-user-environment /nix/var/nix/profiles/default` effectively rolling back the default profile to an older version which was functional and then was able to run the upgrade all the way up.

👍 1

gabeio added the

bug

label

2026-05-05 17:32:12 +00:00

samirtalwar commented

2026-05-06 08:29:26 +00:00

I had the same error when upgrading to both 2.95.1 and 2.95.2. (I thought it was just me the first time.)

raito commented

2026-05-06 09:16:32 +00:00

Owner

Thank you for the report, we are on the double looking into this. Apologies for the operational issues.

👍 1

raito pinned this

2026-05-06 09:16:36 +00:00

raito changed title from ~~nix-daemon crash on upgrade~~ to nix-daemon crash on upgrade from 2.95.1 to 2.95.2

2026-05-06 09:16:44 +00:00

raito changed title from ~~nix-daemon crash on upgrade from 2.95.1 to 2.95.2~~ to nix-daemon crash on upgrade from 2.95.1 to 2.95.2 via nix upgrade-nix

2026-05-06 09:16:55 +00:00

raito commented

2026-05-06 09:32:56 +00:00

Owner

We have identified the issue and a fix is open at https://gerrit.lix.systems/c/lix/+/5567. We will shortly be releasing 2.95.3 quickly to enable upgrades.

❤️ 2

lix-bot commented

2026-05-06 09:33:36 +00:00

Member

This issue was mentioned on Gerrit on the following CLs:

commit message in cl/5567 ("upgrade-nix: use --store local, so we don't kill our own access to the daemon [backport]")

This issue was mentioned on Gerrit on the following CLs: * commit message in [cl/5567](https://gerrit.lix.systems/c/lix/+/5567) ("upgrade-nix: use --store local, so we don't kill our own access to the daemon [backport]")