🐛 Bug Report: thread 'tokio-runtime-worker' panicked at src/post.rs:19:10

[ButteredCats]

Describe the bug

This message pops up a fair bit on my public Redlib instance, typically doing so a lot at once (like 10 times in a row) and seemingly returns nothing to the client as NGINX marks the backend as down without my VTS module logging any error code that would cause such.

Steps to reproduce the bug

Not sure yet.

What's the expected behavior?

This error doesn't appear and Redlib either throws a normal error or returns something proper instead of not responding at all.

Additional context / screenshot

Output with RUST_BACKTRACE=1

index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic_bounds_check
   3: <usize as core::slice::index::SliceIndex<[T]>>::index
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/slice/index.rs:274:10
   4: core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/slice/index.rs:18:15
   5: <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index
             at /usr/src/debug/rust/rustc-1.90.0-src/library/alloc/src/vec/mod.rs:3571:9
   6: redlib::post::_::<impl askama::Template for redlib::post::PostTemplate>::render_into_with_values
             at ./src/post.rs:19:10
   7: askama::Template::render_with_values
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/askama-0.14.0/src/lib.rs:127:14
   8: askama::Template::render
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/askama-0.14.0/src/lib.rs:118:14
   9: redlib::utils::template
             at ./src/utils.rs:1309:11
  10: redlib::post::item::{{closure}}
             at ./src/post.rs:92:7
  11: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/future/future.rs:133:9
  12: redlib::server::Server::listen::{{closure}}::{{closure}}::{{closure}}::{{closure}}
             at ./src/server.rs:363:20
  13: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/future/future.rs:133:9
  14: <hyper::proto::h1::dispatch::Server<S,hyper::body::body::Body> as hyper::proto::h1::dispatch::Dispatch>::poll_msg
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:502:48
  15: hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_write
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:303:72
  16: hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_loop
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:164:26
  17: hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_inner
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:140:21
  18: hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T>::poll_catch
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:119:33
  19: <hyper::proto::h1::dispatch::Dispatcher<D,Bs,I,T> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h1/dispatch.rs:435:14
  20: <hyper::server::conn::ProtoServer<T,B,S,E> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/server/conn.rs:1006:50
  21: <hyper::server::conn::upgrades::UpgradeableConnection<I,S,E> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/server/conn.rs:1066:74
  22: <hyper::common::drain::Watching<F,FN> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/common/drain.rs:96:46
  23: <hyper::server::server::new_svc::NewSvcTask<I,N,S,E,W> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/server/server.rs:792:43
  24: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/core.rs:331:24
  25: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/loom/std/unsafe_cell.rs:16:9
  26: tokio::runtime::task::core::Core<T,S>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/core.rs:320:30
  27: tokio::runtime::task::harness::poll_future::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:532:30
  28: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/panic/unwind_safe.rs:272:9
  29: std::panicking::catch_unwind::do_call
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panicking.rs:589:40
  30: __rust_try
  31: std::panicking::catch_unwind
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panicking.rs:552:19
  32: std::panic::catch_unwind
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panic.rs:359:14
  33: tokio::runtime::task::harness::poll_future
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:520:18
  34: tokio::runtime::task::harness::Harness<T,S>::poll_inner
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:209:27
  35: tokio::runtime::task::harness::Harness<T,S>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:154:20
  36: tokio::runtime::task::raw::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/raw.rs:271:13
  37: tokio::runtime::task::raw::RawTask::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/raw.rs:201:18
  38: tokio::runtime::task::LocalNotified<S>::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/mod.rs:463:13
  39: tokio::runtime::scheduler::multi_thread::worker::Context::run_task::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:674:22
  40: tokio::task::coop::with_budget
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/task/coop/mod.rs:167:5
  41: tokio::task::coop::budget
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/task/coop/mod.rs:133:5
  42: tokio::runtime::scheduler::multi_thread::worker::Context::run_task
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:594:9
  43: tokio::runtime::scheduler::multi_thread::worker::Context::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:542:29
  44: tokio::runtime::scheduler::multi_thread::worker::run::{{closure}}::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:507:24
  45: tokio::runtime::context::scoped::Scoped<T>::set
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/context/scoped.rs:40:9
  46: tokio::runtime::context::set_scheduler::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/context.rs:180:38
  47: std::thread::local::LocalKey<T>::try_with
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/thread/local.rs:315:12
  48: std::thread::local::LocalKey<T>::with
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/thread/local.rs:279:20
  49: tokio::runtime::context::set_scheduler
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/context.rs:180:17
  50: tokio::runtime::scheduler::multi_thread::worker::run::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:502:9
  51: tokio::runtime::context::runtime::enter_runtime
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/context/runtime.rs:65:16
  52: tokio::runtime::scheduler::multi_thread::worker::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:494:5
  53: tokio::runtime::scheduler::multi_thread::worker::Launch::launch::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/scheduler/multi_thread/worker.rs:460:45
  54: <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/blocking/task.rs:42:21
  55: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/core.rs:331:24
  56: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/loom/std/unsafe_cell.rs:16:9
  57: tokio::runtime::task::core::Core<T,S>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/core.rs:320:30
  58: tokio::runtime::task::harness::poll_future::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:532:30
  59: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /usr/src/debug/rust/rustc-1.90.0-src/library/core/src/panic/unwind_safe.rs:272:9
  60: std::panicking::catch_unwind::do_call
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panicking.rs:589:40
  61: __rust_try
  62: std::panicking::catch_unwind
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panicking.rs:552:19
  63: std::panic::catch_unwind
             at /usr/src/debug/rust/rustc-1.90.0-src/library/std/src/panic.rs:359:14
  64: tokio::runtime::task::harness::poll_future
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:520:18
  65: tokio::runtime::task::harness::Harness<T,S>::poll_inner
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:209:27
  66: tokio::runtime::task::harness::Harness<T,S>::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/harness.rs:154:20
  67: tokio::runtime::task::raw::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/raw.rs:271:13
  68: tokio::runtime::task::raw::RawTask::poll
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/raw.rs:201:18
  69: tokio::runtime::task::UnownedTask<S>::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/task/mod.rs:500:13
  70: tokio::runtime::blocking::pool::Task::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/blocking/pool.rs:161:19
  71: tokio::runtime::blocking::pool::Inner::run
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/blocking/pool.rs:511:22
  72: tokio::runtime::blocking::pool::Spawner::spawn_thread::{{closure}}
             at /home/cat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.44.2/src/runtime/blocking/pool.rs:469:47
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

• I checked that the instance that this was reported on is running the latest git commit, or I can reproduce it locally on the latest git commit

[ButteredCats]

This started becoming a huge issue on my Germany server so I enabled logs for a bit and was able to find a link that causes this issue!

Here it is: /r/UFOB/comments/1rxcltl/lockheed_martins_craft_that_can_reach_mars_in/obnr8d8/

Visiting it on Reddit gives a notice that this comment was removed.

I'll be trying to create a pull request for this but I'm unsure what I'll be able to do.