Found waker not created by the Embassy executor. `embassy_time::Timer` only works with the Embassy executor.

[PhaestusFox]

I don't know what I did but my Pico not just crashes with this error any time I try to use a Timer or Ticker, this was working fine this afternoon but stopped after a cargo update.

I have made a minimal example to recreate it:
cargo.toml

[package]
name = "time_test"
version = "0.1.0"
edition = "2021"

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

[dependencies]
embassy-executor = { version = "0.3.0", git = "https://github.com/embassy-rs/embassy", features = ["nightly", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"]  }
embassy-time = { version = "0.1.5", git = "https://github.com/embassy-rs/embassy", features = ["nightly", "unstable-traits", "defmt", "defmt-timestamp-uptime"]  }
embassy-rp = { version = "0.1.0", git = "https://github.com/embassy-rs/embassy", features = ["defmt", "unstable-traits", "nightly", "unstable-pac", "time-driver", "critical-section-impl"]  }
defmt-rtt = "0.4"
panic-probe = { version = "0.3", features = ["print-defmt"] }
cortex-m-rt = "0.7.0"
cortex-m = { version = "0.7.6", features = ["inline-asm"] }

main.rs

#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use embassy_executor::Spawner;
use embassy_time::{Timer, Duration};
use {defmt_rtt as _, panic_probe as _};
use embassy_rp::{bind_interrupts, pio::InterruptHandler, peripherals::PIO0};

bind_interrupts!(struct Irqs {
    PIO0_IRQ_0 => InterruptHandler<PIO0>;
});

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    Timer::after(Duration::from_millis(10)).await
}

also have memory.x and build.rs from the pi examples

here is the full error message when I run this using a Pico probe:

0.000538 ERROR panicked at 'Found waker not created by the Embassy executor. `embassy_time::Timer` only works with the Embassy executor.'
└─ embassy_executor::raw::waker::task_from_waker @ C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\fmt.rs:106 
0.000596 ERROR panicked at C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\defmt-0.3.5\src\lib.rs:368:5:
explicit panic
└─ panic_probe::print_defmt::print @ C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\panic-probe-0.3.1\src\lib.rs:104
DEBUG probe_rs::debug::unit_info: Found DIE, now checking for inlined functions: name=None
DEBUG probe_rs::debug::unit_info: Found DIE, now checking for inlined functions: name=None
DEBUG probe_rs::debug::debug_info: UNWIND: Callsite for inlined function None
DEBUG probe_rs::debug::debug_info: UNWIND: Callsite for inlined function None
DEBUG probe_rs::debug::debug_info: UNWIND: Callsite for inlined function None
DEBUG probe_rs::debug::debug_info: UNWIND: Callsite for inlined function None
DEBUG probe_rs::debug::unit_info: Found DIE, now checking for inlined functions: name=None
Frame 0: HardFault @ 0x1000283c
Frame 1: __udf @ 0x10000ca2 inline
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cortex-m-0.7.7\src\..\asm/inline.rs:181:5
Frame 2: udf @ 0x0000000010000ca2 inline
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cortex-m-0.7.7\src/call_asm.rs:11:43
Frame 3: hard_fault @ 0x0000000010000ca2 inline
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\panic-probe-0.3.1\src/lib.rs:86:5
Frame 4: panic @ 0x0000000010000ca2
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\panic-probe-0.3.1\src/lib.rs:54:9
Frame 5: panic_fmt @ 0x10001832
       /rustc/1c05d50c8403c56d9a8b6fb871f15aaa26fb5d07\library/core/src/panicking.rs:72:14
Frame 6: panic_display<&str> @ 0x10001890 inline
       /rustc/1c05d50c8403c56d9a8b6fb871f15aaa26fb5d07\library/core/src/panicking.rs:178:5
Frame 7: panic_explicit @ 0x0000000010001872
       /rustc/1c05d50c8403c56d9a8b6fb871f15aaa26fb5d07\library/core/src/panicking.rs:160:5
Frame 8: panic_cold_explicit @ 0x10001632
       C:/rustc/1c05d50c8403c56d9a8b6fb871f15aaa26fb5d07/library/core/src/panic.rs:87:13
Frame 9: default_panic @ 0x10001624
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\defmt-0.3.5\src/lib.rs:368:5
Frame 10: panic @ 0x100013ca inline
       C:\Users\Phox\.cargo\registry\src\index.crates.io-6f17d22bba15001f\defmt-0.3.5\src\export/mod.rs:133:14
Frame 11: task_from_waker @ 0x00000000100013c6 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src/fmt.rs:106:13
Frame 12: schedule_wake @ 0x00000000100013b4 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/mod.rs:600:20
Frame 13: _embassy_time_schedule_wake @ 0x00000000100013b4
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-time\src/queue.rs:55:13
Frame 14: schedule_wake @ 0x10001492 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-time\src/timer.rs
Frame 15: poll @ 0x000000001000148c
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-time\src/timer.rs:113:13
Frame 16: {async_fn#0} @ 0x10000244 inline
       G:\RustStuff\Projects\dry_box\time_test\src/main.rs
Frame 17: <unknown function @ 0x10000244> @ 0x0000000010000240
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/mod.rs:161:15
Frame 18: <unknown function @ 0x10001252> @ 0x10001252 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/util.rs:55:9
Frame 19: <unknown function @ 0x10001252> @ 0x0000000010001252 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/timer_queue.rs:34:28
Frame 20: {closure#0} @ 0x0000000010001252 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/mod.rs:418:17
Frame 21: <unknown function @ 0x10001252> @ 0x0000000010001238 inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/run_queue.rs:85:13
Frame 22: <unknown function @ 0x10001252> @ 0x000000001000121a inline
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/mod.rs:391:13
Frame 23: <unknown function @ 0x10001252> @ 0x0000000010001178
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\raw/mod.rs:532:9
Frame 24: <unknown function @ 0x100002dc> @ 0x100002dc
       C:\Users\Phox\.cargo\git\checkouts\embassy-9312dcb0ed774b29\e70c531\embassy-executor\src\arch/cortex_m.rs:107:21
Frame 25: __cortex_m_rt_main @ 0x1000041a
       G:\RustStuff\Projects\dry_box\time_test\src/main.rs:13:1
Frame 26: __cortex_m_rt_main_trampoline @ 0x10000404
       G:\RustStuff\Projects\dry_box\time_test\src/main.rs:13:1
Frame 27: <unknown function @ 0x100001e6> @ 0x100001e6
Frame 28: <unknown function @ 0x100001e6> @ 0x100001e6
Error: CPU halted unexpectedly.
error: process didn't exit successfully: `probe-rs run --chip RP2040 G:\RustStuff\Projects\dry_box\target\thumbv6m-none-eabi\release\time_test` (exit code: 1)

[Verequies]

I have also encountered this issue. It is fixed if you downgrade to a prior version of Rust nightly. Seems like something changed in the last few days has caused Embassy to crash on start on the RP2040.

Went and narrowed it down. The last working nightly was on the 18th. Should be able to add in the below file to your project root and it should now compile and run correctly.

# Before upgrading check that everything is available on all tier1 targets here:
# https://rust-lang.github.io/rustup-components-history
[toolchain]
channel = "nightly-2023-10-18"
components = [ "rust-src", "rustfmt", "llvm-tools" ]
targets = [ "thumbv6m-none-eabi" ]

[DCNick3]

This was reported to rustc as rust-lang/rust#117047

[AzazKamaz]

Several alternative ways to fix, in file embassy-executor/src/raw/waker.rs:

• make VTABLE static instead of const - probably proper way to fix
• make VTABLE functions inline(never) - clone(), wake(), drop()
• make functions that refer VTABLE inline(never) - clone(), from_task(), task_from_waker()

Also you can just disable cross-crate inlining with -Zcross-crate-inline-threshold=0 compiler option

[Dirbaio]

fixed in #2112