[ICE]: thread 'main' (8829) panicked at /rustc-dev/31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd/library/std/src/thread/lifecycle.rs:247:14: threads should not terminate unexpectedly

Code

#![no_main]
#![no_std]

#[ariel_os::task(autostart)]
async fn coap_run() {
    use coap_handler_implementations::{HandlerBuilder, SimpleRendered, new_dispatcher};

    let handler = new_dispatcher()
        .at(&["connect"], SimpleRendered("Hello from Ariel OS"));

    ariel_os::coap::coap_run(handler).await;
}

[package]
name = "iot-device"
version = "0.1.0"
edition = "2024"

[dependencies]
ariel-os = { path = "build/imports/ariel-os/src/ariel-os", features = ["coap-server"] }
ariel-os-boards = { path = "build/imports/ariel-os/src/ariel-os-boards" }
coap-handler = "0.2.0"
coap-handler-implementations = "0.6.1"
coap-message = "0.3.2"

imports:
  - git:
      url: https://github.com/ariel-os/ariel-os
      tag: v0.5.0
    dldir: ariel-os

apps:
  - name: iot-device
    selects:
      - coap-server

Meta

rustc --version --verbose:

rustc 1.96.1 (31fca3adb 2026-06-26)
binary: rustc
commit-hash: 31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd
commit-date: 2026-06-26
host: x86_64-unknown-linux-gnu
release: 1.96.1
LLVM version: 22.1.2

Error output

laze build -b espressif-esp32-c6-devkitc-1 run
laze: project root: /mnt/development/Entwicklung/iot-dealer/iot-device relpath: . project_file: laze-project.yml
laze: building all for espressif-esp32-c6-devkitc-1
laze: reading cache took 3.841576ms.
warning: patch `cyw43 v0.5.0 (https://github.com/ariel-os/embassy?rev=603583d9#603583d9)` was not used in the crate graph
warning: patch `embassy-net v0.9.1 (https://github.com/ariel-os/embassy?rev=37683fe299f12028e5a77af9f742f496da08afcd#37683fe2)` was not used in the crate graph
warning: patch `esp-println v0.16.1 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)` was not used in the crate graph
warning: patch `esp-radio v0.17.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)` was not used in the crate graph
warning: patch `esp-radio-rtos-driver v0.2.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)` was not used in the crate graph
help: Check that the patched package version and available features are compatible
      with the dependency requirements. If the patch has a different version from
      what is locked in the Cargo.lock file, run `cargo update` to use the new
      version. This may also occur with an optional dependency that is not enabled.
    Updating crates.io index
    Updating git repository `https://github.com/alexmoon/nrf-sdc`
    Updating git repository `https://github.com/esp-rs/esp-wifi-sys`
   Compiling heapless v0.8.0
   Compiling syn v1.0.109
   Compiling jiff v0.2.31

thread 'main' (8829) panicked at /rustc-dev/31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd/library/std/src/thread/lifecycle.rs:247:14:
threads should not terminate unexpectedly
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::option::expect_failed
   3: rustc_driver_impl::run_compiler
   4: rustc_driver_impl::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: the compiler unexpectedly panicked. This is a bug

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.96.1 (31fca3adb 2026-06-26) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C debug-assertions=off

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
   Compiling embassy-sync v0.7.2
   Compiling embassy-sync v0.6.2
   Compiling esp-sync v0.1.1 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling embassy-embedded-hal v0.5.0
   Compiling ariel-os-random v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-random)
   Compiling embedded-nal-coap v0.1.0-alpha.5
   Compiling esp-println v0.16.1 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling esp-radio-rtos-driver v0.2.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling ariel-os-log v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-log)
   Compiling esp-hal v1.0.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling svgbobdoc v0.3.0
   Compiling data-encoding-macro-internal v0.1.18
   Compiling data-encoding-macro v0.1.20
   Compiling rlsf v0.2.2
   Compiling cbor-edn v0.0.9
   Compiling esp-alloc v0.9.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling ariel-os-coap v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-coap)
   Compiling ariel-os-alloc v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-alloc)
   Compiling ariel-os-threads v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-threads)
   Compiling esp-phy v0.1.1 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling ariel-os-power v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-power)
   Compiling esp-radio v0.17.0 (https://github.com/ariel-os/esp-hal?rev=531c629afdd80ea464682ce7f4db8baed97967a6#531c629a)
   Compiling ariel-os-rt v0.5.0 (/mnt/development/Entwicklung/iot-dealer/iot-device/build/imports/ariel-os/src/ariel-os-rt)

   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::option::expect_failed
   3: rustc_driver_impl::run_compiler
   4: rustc_driver_impl::main

Start by reproducing the laze build -b espressif-esp32-c6-devkitc-1 run failure with the provided Ariel OS, CoAP, and Rust versions. Inspect the panic at library/std/src/thread/lifecycle.rs:247 and the rustc_driver_impl::run_compiler entry point, then narrow the triggering crate or input. Done means identifying the compiler failure and adding a regression test or a confirmed fix path.