Description
I just had my code hit this .expect in tower-ready-cache. It's using tower-balance::pool (and thus also tower-balance::p2c). Not sure what caused it, but figured maybe @olix0r can tease it out from the backtrace?
thread 'tokio-runtime-worker' panicked at 'missing cancelation', /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/tower-ready-cache-0.3.0/src/cache.rs:236:37
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1052
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1428
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:204
9: std::panicking::default_hook
at src/libstd/panicking.rs:224
10: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:470
11: rust_begin_unwind
at src/libstd/panicking.rs:378
12: core::panicking::panic_fmt
at src/libcore/panicking.rs:85
13: core::option::expect_failed
at src/libcore/option.rs:1203
14: core::option::Option<T>::expect
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libcore/option.rs:347
15: tower_ready_cache::cache::ReadyCache<K,S,Req>::poll_pending
at ./.cargo/registry/src/github.com-1ecc6299db9ec823/tower-ready-cache-0.3.0/src/cache.rs:236
16: tower_balance::p2c::service::Balance<D,Req>::promote_pending_to_ready
at ./.cargo/registry/src/github.com-1ecc6299db9ec823/tower-balance-0.3.0/src/p2c/service.rs:151
17: <tower_balance::p2c::service::Balance<D,Req> as tower_service::Service<Req>>::poll_ready
at ./.cargo/registry/src/github.com-1ecc6299db9ec823/tower-balance-0.3.0/src/p2c/service.rs:238
18: <tower_balance::pool::Pool<MS,Target,Req> as tower_service::Service<Req>>::poll_ready
at ./.cargo/registry/src/github.com-1ecc6299db9ec823/tower-balance-0.3.0/src/pool/mod.rs:373
19: <tower_buffer::worker::Worker<T,Request> as core::future::future::Future>::poll
at ./.cargo/registry/src/github.com-1ecc6299db9ec823/tower-buffer-0.3.0/src/worker.rs:169
20: tokio::task::core::Core<T>::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/core.rs:128
21: tokio::task::harness::Harness<T,S>::poll::{{closure}}::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:119
22: core::ops::function::FnOnce::call_once
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libcore/ops/function.rs:232
23: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panic.rs:318
24: std::panicking::try::do_call
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panicking.rs:303
25: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:86
26: std::panicking::try
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panicking.rs:281
27: std::panic::catch_unwind
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panic.rs:394
28: tokio::task::harness::Harness<T,S>::poll::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:100
29: tokio::loom::std::causal_cell::CausalCell<T>::with_mut
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/loom/std/causal_cell.rs:41
30: tokio::task::harness::Harness<T,S>::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:99
31: tokio::task::raw::RawTask::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/raw.rs:113
32: tokio::task::Task<S>::run
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/mod.rs:381
33: tokio::runtime::thread_pool::worker::GenerationGuard::run_task
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:459
34: tokio::runtime::thread_pool::worker::GenerationGuard::process_available_work
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:317
35: tokio::runtime::thread_pool::worker::GenerationGuard::run
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:282
36: tokio::runtime::thread_pool::worker::Worker::run::{{closure}}::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:160
37: std::thread::local::LocalKey<T>::try_with
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/thread/local.rs:262
38: std::thread::local::LocalKey<T>::with
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/thread/local.rs:239
39: tokio::runtime::thread_pool::worker::Worker::run::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:136
40: tokio::runtime::thread_pool::current::set::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/current.rs:47
41: std::thread::local::LocalKey<T>::try_with
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/thread/local.rs:262
42: std::thread::local::LocalKey<T>::with
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/thread/local.rs:239
43: tokio::runtime::thread_pool::current::set
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/current.rs:29
44: tokio::runtime::thread_pool::worker::Worker::run
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/worker.rs:132
45: tokio::runtime::thread_pool::Workers::spawn::{{closure}}::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/thread_pool/mod.rs:113
46: <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/blocking/task.rs:30
47: tokio::task::core::Core<T>::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/core.rs:128
48: tokio::task::harness::Harness<T,S>::poll::{{closure}}::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:119
49: core::ops::function::FnOnce::call_once
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libcore/ops/function.rs:232
50: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panic.rs:318
51: std::panicking::try::do_call
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panicking.rs:303
52: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:86
53: std::panicking::try
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panicking.rs:281
54: std::panic::catch_unwind
at /rustc/fc23a81831d5b41510d3261c20c34dd8d32f0f31/src/libstd/panic.rs:394
55: tokio::task::harness::Harness<T,S>::poll::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:100
56: tokio::loom::std::causal_cell::CausalCell<T>::with_mut
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/loom/std/causal_cell.rs:41
57: tokio::task::harness::Harness<T,S>::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/harness.rs:99
58: tokio::task::raw::RawTask::poll
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/raw.rs:113
59: tokio::task::Task<S>::run
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/task/mod.rs:381
60: tokio::runtime::blocking::pool::run_task
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/blocking/pool.rs:311
61: tokio::runtime::blocking::pool::Inner::run
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/blocking/pool.rs:230
62: tokio::runtime::blocking::pool::Spawner::spawn_thread::{{closure}}::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/blocking/pool.rs:210
63: tokio::runtime::context::enter
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/context.rs:72
64: tokio::runtime::handle::Handle::enter
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/handle.rs:34
65: tokio::runtime::blocking::pool::Spawner::spawn_thread::{{closure}}
at ./.cargo/git/checkouts/tokio-377c595163f99a10/3fb217f/tokio/src/runtime/blocking/pool.rs:209
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