rust runtime_error ai_generated true

thread 'tokio-runtime-worker' panicked at 'Cannot drop a runtime in a context where blocking is not allowed'

ID: rust/tokio-runtime-shutdown-timeout

Also available as: JSON · Markdown · 中文
82%Fix Rate
87%Confidence
1Evidence
2024-01-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
tokio 1.25.0 active — — —
tokio 1.30.0 active — — —
tokio 1.35.0 active — — —

Root Cause

Attempting to drop a Tokio runtime inside an asynchronous context (e.g., inside a future or task) where blocking is prohibited, often due to incorrect runtime nesting or shutdown.

generic

中文

在异步上下文（例如future或task）中尝试丢弃Tokio运行时，而该上下文禁止阻塞操作，通常是由于运行时嵌套或关闭不正确。

Official Documentation

https://docs.rs/tokio/latest/tokio/runtime/struct.Runtime.html

Workarounds

  1. 85% success Ensure the runtime is dropped outside of any async context, e.g., by storing it in a struct and dropping it in a synchronous scope. 
    Ensure the runtime is dropped outside of any async context, e.g., by storing it in a struct and dropping it in a synchronous scope.
  2. 80% success Use `tokio::runtime::Runtime::shutdown_timeout` to gracefully shut down before dropping. 
    Use `tokio::runtime::Runtime::shutdown_timeout` to gracefully shut down before dropping.

中文步骤

  1. 确保运行时在任何异步上下文之外被丢弃，例如将其存储在结构体中，并在同步作用域中丢弃。
  2. 使用`tokio::runtime::Runtime::shutdown_timeout`在丢弃前优雅关闭。

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Forgetting the runtime leaks resources and doesn't fix the underlying issue; the panic still occurs on drop.

  2. 85% fail

    The panic is caused by the drop logic, not by ownership; Arc doesn't prevent the drop from happening.

  3. 75% fail

    `block_on` itself blocks, which may trigger the same panic if called from an async context.