JoinHandle::abort() panics with "scheduler context missing"

[manuthambi]

Version

tokio v0.3.4
tokio-macros v0.3.1

Platform
Linux main-server 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64 GNU/Linux

Description
JoinHandle::abort() on a task which is blocked results in the abort call panicing with scheduler context missing

Here is the code snippet:

#[tokio::main]
async fn main() {
    let handle = tokio::spawn(async move {
        println!("task started");
        tokio::time::sleep(std::time::Duration::new(100, 0)).await
    });

    // wait for task to sleep.
    tokio::time::sleep(std::time::Duration::new(1, 0)).await;

    handle.abort();
    let _ = handle.await;
}

Here is the resulting panic:

  Compiling rust v0.1.0 (/misc/home/manu/programs/rust)
    Finished dev [unoptimized + debuginfo] target(s) in 0.96s
     Running `/tmp/rust-target/debug/rust`
task started
thread 'main' panicked at 'scheduler context missing', /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/thread_pool/worker.rs:633:31
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
   1: core::panicking::panic_fmt
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:85
   2: core::option::expect_failed
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/option.rs:1213
   3: core::option::Option<T>::expect
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/option.rs:333
   4: tokio::runtime::thread_pool::worker::<impl tokio::runtime::task::Schedule for alloc::sync::Arc<tokio::runtime::thread_pool::worker::Worker>>::release::{{closure}}
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/thread_pool/worker.rs:633
   5: tokio::macros::scoped_tls::ScopedKey<T>::with
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/macros/scoped_tls.rs:72
   6: tokio::runtime::thread_pool::worker::<impl tokio::runtime::task::Schedule for alloc::sync::Arc<tokio::runtime::thread_pool::worker::Worker>>::release
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/thread_pool/worker.rs:632
   7: tokio::runtime::task::core::Core<T,S>::release::{{closure}}
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/core.rs:264
   8: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/loom/std/unsafe_cell.rs:10
   9: tokio::runtime::task::core::Core<T,S>::release
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/core.rs:260
  10: tokio::runtime::task::harness::Harness<T,S>::complete
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/harness.rs:322
  11: tokio::runtime::task::harness::Harness<T,S>::cancel_task
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/harness.rs:302
  12: tokio::runtime::task::harness::Harness<T,S>::shutdown
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/harness.rs:285
  13: tokio::runtime::task::raw::shutdown
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/raw.rs:130
  14: tokio::runtime::task::raw::RawTask::shutdown
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/raw.rs:90
  15: tokio::runtime::task::join::JoinHandle<T>::abort
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/task/join.rs:195
  16: rust::main::{{closure}}
             at ./src/main.rs:11
  17: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/future/mod.rs:79
  18: tokio::park::thread::CachedParkThread::block_on::{{closure}}
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/park/thread.rs:263
  19: tokio::coop::with_budget::{{closure}}
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/coop.rs:121
  20: std::thread::local::LocalKey<T>::try_with
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/thread/local.rs:265
  21: std::thread::local::LocalKey<T>::with
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/thread/local.rs:241
  22: tokio::coop::with_budget
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/coop.rs:114
  23: tokio::coop::budget
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/coop.rs:98
  24: tokio::park::thread::CachedParkThread::block_on
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/park/thread.rs:263
  25: tokio::runtime::enter::Enter::block_on
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/enter.rs:151
  26: tokio::runtime::thread_pool::ThreadPool::block_on
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/thread_pool/mod.rs:71
  27: tokio::runtime::Runtime::block_on
             at /misc/home/manu/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.3.4/src/runtime/mod.rs:452
  28: rust::main
             at ./src/main.rs:1
  29: core::ops::function::FnOnce::call_once
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:227
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.