Bevy 0.5.0 can't run with DefaultPlugins: BackendSpecificError

[kugiyasan]

Bevy version

bevy = "0.5.0"

Operating system & version

Arch Linux x86_64 5.10.42-1-lts
DE: KDE Plasma

What you did

cargo new cant_load_default_plugin
cd cant_load_default_plugin
printf 'use bevy::prelude::*;\nfn main() { App::build().add_plugins(DefaultPlugins).run(); }' > src/main.rs
echo 'bevy = "0.5.0"' >> Cargo.toml
cargo run

What you expected to happen

The program should build

What actually happened

5 compilation errors about use of unstable library feature

I then tried

rustup override set nightly
RUST_BACKTRACE=1 cargo run

but then

thread 'main' panicked at 'build_output_stream failed with all supported formats: BackendSpecific { err: BackendSpecificError { description: "ALSA function 'snd_pcm_start' failed with error 'EBADFD: File descriptor in bad state'" } }', $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:208:22
stack backtrace:
   0: rust_begin_unwind
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/std/src/panicking.rs:515:5
   1: core::panicking::panic_fmt
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/core/src/panicking.rs:92:14
   2: core::result::unwrap_failed
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/core/src/result.rs:1355:5
   3: core::result::Result<T,E>::expect
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/core/src/result.rs:997:23
   4: <cpal::platform::platform_impl::Device as rodio::stream::CpalDeviceExt>::try_new_output_stream::{{closure}}
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:204:17
   5: core::result::Result<T,E>::unwrap_or_else
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/core/src/result.rs:821:23
   6: <cpal::platform::platform_impl::Device as rodio::stream::CpalDeviceExt>::try_new_output_stream
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:200:12
   7: rodio::stream::OutputStream::try_from_device
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:31:32
   8: rodio::stream::OutputStream::try_default
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:45:9
   9: <bevy_audio::audio_output::AudioOutput<P> as core::default::Default>::default
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_audio-0.5.0/src/audio_output.rs:22:39
  10: <T as bevy_ecs::world::FromWorld>::from_world
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_ecs-0.5.0/src/world/mod.rs:928:9
  11: bevy_app::app_builder::AppBuilder::init_non_send_resource
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/app_builder.rs:272:28
  12: <bevy_audio::AudioPlugin as bevy_app::plugin::Plugin>::build
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_audio-0.5.0/src/lib.rs:23:9
  13: bevy_app::plugin_group::PluginGroupBuilder::finish
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/plugin_group.rs:104:21
  14: bevy_app::app_builder::AppBuilder::add_plugins
             at $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/app_builder.rs:295:9
  15: cant_load_default_plugin::main
             at ./src/main.rs:1:35
  16: core::ops::function::FnOnce::call_once
             at /rustc/dbe459dedd33470f2cb28101157de316caaffa66/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

I also tried this src/main.rs, and this runs and exits instantly without any error, while I expected it to never exit

use bevy::prelude::*;
fn main() {
    App::build()
        .add_plugin(bevy::log::LogPlugin::default())
        .add_plugin(bevy::core::CorePlugin::default())
        .add_plugin(bevy::transform::TransformPlugin::default())
        .add_plugin(bevy::diagnostic::DiagnosticsPlugin::default())
        .add_plugin(bevy::input::InputPlugin::default())
        .add_plugin(bevy::window::WindowPlugin::default())
        .add_plugin(bevy::asset::AssetPlugin::default())
        .add_plugin(bevy::scene::ScenePlugin::default())
        .run();
}

[MinerSebas]

5 compilation errors about use of unstable library feature

1. Bevy requires the latest stable, that's the reason for your compilation errors

Nightly

2. Seems like your ALSA install has problems: "ALSA function 'snd_pcm_start' failed with error 'EBADFD: File descriptor in bad state'"
   Did you take a look here? https://github.com/bevyengine/bevy/blob/main/docs/linux_dependencies.md#arch--manjaro
   For now, you could disable the bevy_audio and mp3 Features to still compile

I also tried this src/main.rs, and this runs and exits instantly without any error, while I expected it to never exit

3. Bevy needs a runner to drive the update loop/keep Bevy running, but you are missing WinitPlugin which provides it in Bevy.

[kugiyasan]

Thanks for the quick answer!

1. Yes, I was on the latest stable, but like I briefly said, I got 5 unstable features compilation errors, like the one below, and that's why I tried the nightly toolchain

rustup override set stable
cargo run
[...]
error[E0658]: use of unstable library feature 'unsafe_cell_get_mut'
   --> $HOME.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_ecs-0.5.0/src/storage/sparse_set.rs:217:32
    |
217 |         let ticks = self.ticks.get_mut().iter_mut();
    |                                ^^^^^^^
    |
    = note: see issue #76943 <https://github.com/rust-lang/rust/issues/76943> for more information

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0658`.
error: could not compile `bevy_ecs`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

2. I already looked at the dependencies, I reinstalled libx11 pkgconf alsa-lib, same results

[MinerSebas]

Realy strange 🤔 , that Feature was stabilised in 1.50.0: rust-lang/rust#79485

[NathanSWard]

What is your output from cargo --version and rustc --version?

[kugiyasan]

Oops noob mistake, my stable was 1.49.0, I just had to rustup update. I somehow thought that rust would magically keep my stable always up to date...

$ cargo --version
cargo 1.52.0 (69767412a 2021-04-21)
$ rustc --version
rustc 1.52.1 (9bc8c42bb 2021-05-09)

For now, you could disable the `bevy_audio` and `mp3` Features to still compile

I still need to disable bevy_audio and mp3 to be able to run the program. It's not a problem for me, since I don't have intentions to touch the audio for now, but this still needs further investigation ig

[NathanSWard]

@kugiyasan
Is it ok then if we close out this issue since your primary concern was solved?

[MinerSebas]

#2269 also should have fixed that bevy panicks in your case. (Though you will still be missing audio)

[Pomegranate123]

I'm having the exact same problem, I was going through the Bevy book and as soon as I added .add_plugins(DefaultPlugins) I got the same error:

$ cargo r
    Finished dev [unoptimized + debuginfo] target(s) in 0.37s
     Running `target/debug/game`
thread 'main' panicked at 'build_output_stream failed with all supported formats: BackendSpecific { err: BackendSpecificError { description: "ALSA function \'snd_pcm_start\' failed with error \'EBADFD: File descriptor in bad state\'" } }', /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:208:22
stack backtrace:
   0: rust_begin_unwind
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14
   2: core::option::expect_none_failed
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/option.rs:1329:5
   3: core::result::Result<T,E>::expect
             at /home/pomegranate/.config/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/result.rs:997:23
   4: <cpal::platform::platform_impl::Device as rodio::stream::CpalDeviceExt>::try_new_output_stream::{{closure}}
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:204:17
   5: core::result::Result<T,E>::unwrap_or_else
             at /home/pomegranate/.config/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/result.rs:821:23
   6: <cpal::platform::platform_impl::Device as rodio::stream::CpalDeviceExt>::try_new_output_stream
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:200:12
   7: rodio::stream::OutputStream::try_from_device
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:31:32
   8: rodio::stream::OutputStream::try_default
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/rodio-0.13.1/src/stream.rs:45:9
   9: <bevy_audio::audio_output::AudioOutput<P> as core::default::Default>::default
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_audio-0.5.0/src/audio_output.rs:22:39
  10: <T as bevy_ecs::world::FromWorld>::from_world
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_ecs-0.5.0/src/world/mod.rs:928:9
  11: bevy_app::app_builder::AppBuilder::init_non_send_resource
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/app_builder.rs:272:28
  12: <bevy_audio::AudioPlugin as bevy_app::plugin::Plugin>::build
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_audio-0.5.0/src/lib.rs:23:9
  13: bevy_app::plugin_group::PluginGroupBuilder::finish
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/plugin_group.rs:104:21
  14: bevy_app::app_builder::AppBuilder::add_plugins
             at /home/pomegranate/.cargo/registry/src/github.com-1ecc6299db9ec823/bevy_app-0.5.0/src/app_builder.rs:295:9
  15: game::main
             at ./src/main.rs:8:5
  16: core::ops::function::FnOnce::call_once
             at /home/pomegranate/.config/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Versions:

$ cargo --version
cargo 1.52.0-nightly (90691f2bf 2021-03-16)
$ rustc --version
rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
$ uname -rm
5.12.2-arch1-1 x86_64

Cargo.toml:

$ cat Cargo.toml
[package]
name = "game"
version = "0.1.0"
authors = ["Pomegranate123 <#####@#####.####>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
bevy = { version = "0.5.0", features = ["dynamic"] }

I reinstalled the necessary dependencies for Arch, but nothing changed. Removing the dynamic feature also didn't work.

[bjorn3]

ALSA function 'snd_pcm_start' failed with error 'EBADFD: File descriptor in bad state'

This is a problem with initializing the sound plugin. Since #2269 this no longer causes a crash. Just missing sound.

[Pomegranate123]

What do you mean with 'no longer causes a crash'? My code isn't compiling because of it, isn't that a crash? What would I need to do to fix it?

[bjorn3]

Your code does compile. It just crashed when actually running it due to failed initialization of the sound plugin. The fix would be to either disable the sound plugin (.add_plugins_with(DefaultPlugins, |plugins| plugins.disable::<bevy::audio::AudioPlugin>())) or switch to the main branch.

[Pomegranate123]

Alright, but what if I do want to use sound? Is anything known about the actual issue yet, workaround aside?