RuntimeError: Out of bounds memory access wasm.__wbindgen_start()

[t0muxx]

Describe the Bug

Hello

I'm reaching to you after having opened issues with leptos-rs and tauri :

• [bug] crashes : RuntimeError: Out of bounds memory access  tauri-apps/tauri#7154
• Random wasm.__wbindgen_start() crashes leptos-rs/leptos#1153

I am currently having "semi-random" crashes with all Tauri templates using wasm-bindgen (Leptos, Sycamore, Yew).
Tauri's team point of view is that this bug seems to come from wasm-bindgen.

Here is an example of what is happening :

(This time I had to Reload three times to trigger the crash, but sometimes it happens at first start)

(You can see the second time the application crashes directly)

Here is the stacktrace of the bug :

[Error] Unhandled Promise Rejection: RuntimeError: Out of bounds memory access (evaluating 'wasm.__wbindgen_start()')
	<?>.wasm-function[<core::cell::BorrowRefMut as core::ops::drop::Drop>::drop::hf42c085d7285d3bf] (test-ui-d856fd919585e10.js:612)
	<?>.wasm-function[core::ptr::drop_in_place<core::cell::BorrowRefMut>::h8315dbe9c700eb71]
	<?>.wasm-function[core::ptr::drop_in_place<core::cell::RefMut<leptos_dom::hydration::HydrationKey>>::h9149f27aa3a23070]
	<?>.wasm-function[leptos_dom::hydration::HydrationCtx::next_component::{{closure}}::h6883c5616db2da57]
	<?>.wasm-function[std::thread::local::LocalKey<T>::try_with::hb94a1e0a0aef6298]
	<?>.wasm-function[std::thread::local::LocalKey<T>::with::h89a5ada3f068daa0]
	<?>.wasm-function[leptos_dom::hydration::HydrationCtx::next_component::hc33f11bf247b26b6]
	<?>.wasm-function[leptos_dom::components::Component<F,V>::new::h465abdfae9683bc5]
	<?>.wasm-function[test_ui::app::App::hbad01cb3c50974fa]
	<?>.wasm-function[test_ui::main::{{closure}}::hde19ea94619b4cb6]
	<?>.wasm-function[leptos_dom::mount_to::{{closure}}::hd08507726cd06d49]
	<?>.wasm-function[leptos_reactive::runtime::RuntimeId::run_scope_undisposed::{{closure}}::h2390710064a783d0]
	<?>.wasm-function[leptos_reactive::runtime::with_runtime::{{closure}}::hfa3448a66d7673c7]
	<?>.wasm-function[std::thread::local::LocalKey<T>::try_with::hd4a7100a53c5c0c5]
	<?>.wasm-function[std::thread::local::LocalKey<T>::with::h30c6a5082ecc8b4b]
	<?>.wasm-function[leptos_reactive::runtime::with_runtime::h6a6a8e56b71ffd28]
	<?>.wasm-function[leptos_reactive::runtime::RuntimeId::run_scope_undisposed::h4069f30e99a0b11d]
	<?>.wasm-function[leptos_reactive::scope::create_scope::h5e625713b546d5da]
	<?>.wasm-function[leptos_dom::mount_to::hd2c03519c91041c3]
	<?>.wasm-function[leptos_dom::mount_to_body::h791b05ecb2e8fb8f]
	<?>.wasm-function[test_ui::main::h2310ebba16fb5874]
	<?>.wasm-function[core::ops::function::FnOnce::call_once::h684953229061ec4b]
	<?>.wasm-function[std::sys_common::backtrace::__rust_begin_short_backtrace::h68ebcd09cf1acae6]
	<?>.wasm-function[std::rt::lang_start::{{closure}}::h03c05521b45f41b4]
	<?>.wasm-function[std::rt::lang_start_internal::hbecc6ff7763fb2f1]
	<?>.wasm-function[std::rt::lang_start::h9cdb9a905687b1d8]
	<?>.wasm-function[main]
	<?>.wasm-function[]
	wasm-stub
	__wbg_finalize_init (test-ui-d856fd919585e10.js:612)

Steps to Reproduce

First i will say I don't know how to reproduce it directly with wasm-bindgen but you can reproduce it using Tauri this way :

1. Create a Tauri app using cargo create-tauri-app
2. Select Rust as front-end language
3. Select Leptos or Yew or Sycamore as UI template.
4. Now you can cd into the project directory
5. Run the app using cargo tauri dev
6. Open developer console to check for crashes
7. Right-Click Reload until you get the crashes

You can also use run AppImage : https://file.io/qV7is0fTatqw

Expected Behavior

The wasm.__wbindgen_start() should not crash

Additional Context

I would happily helps to fix this issue by submitting a PR, but I will need help to find out where this bug come from.

Thanks,

[Liamolucko]

I wasn't able to reproduce this, on either macOS or Manjaro Linux. Could you tell me what version of wasm-bindgen you're using, in case that has something to do with it?

[Liamolucko]

Scratch that actually, the template should be using the latest version of wasm-bindgen so if it's happening in the template it must be happening in the latest version. So, I'm not sure how to debug this further.

The error message reminds me of #3153, which was happening because init was getting called twice and resetting the wasm memory, but I don't see how that could be happening here since trunk only generates a single once-off init call.

[t0muxx]

Thanks for your reply,

I can confirm you that the template is using version 0.2 by default :

wasm-bindgen = { version = "0.2", features = ["serde-serialize"] }

But even when I specify version = "0.2.86" I get the crash.

A test has been done on Pop!_Os (ubuntu based) and the crash happen too, but less often this time (to be noted that the machine running the Pop!_os has a lot more cpu resources).

I did another test in fresh Manjaro virtual machine and I reproduced the crash :

[Error] Unhandled Promise Rejection: RuntimeError: Out of bounds memory access (near '...e__h31f67d380e89dea9(arg0, arg1, addHeap...')
	<?>.wasm-function[<T as alloc::string::ToString>::to_string::h78049b9712ebcb71] (tet-ui-e492346f7f694496.js:224:135)
	<?>.wasm-function[<yew::virtual_dom::vnode::VNode as core::convert::From<T>>::from::hc4622367628a0d0d]
	<?>.wasm-function[<T as core::convert::Into<U>>::into::h59e849be70a107c7]
	<?>.wasm-function[<yew::utils::NodeSeq<IN,OUT> as core::convert::From<IN>>::from::h4715b4ebc797404c]
	<?>.wasm-function[<T as core::convert::Into<U>>::into::ha74799d1de54ebcb]
	<?>.wasm-function[<tet_ui::app::App as yew::functional::FunctionProvider>::run::app::h5627a23ac273eadb]
	<?>.wasm-function[<tet_ui::app::App as yew::functional::FunctionProvider>::run::h976a9f8b8db8f3bd]
	<?>.wasm-function[yew::functional::FunctionComponent<T>::render::hb6eef454e65879ab]
	<?>.wasm-function[<tet_ui::app::App as yew::html::component::BaseComponent>::view::h6964305c789320c5]
	<?>.wasm-function[<yew::html::component::lifecycle::CompStateInner<COMP> as yew::html::component::lifecycle::Stateful>::view::hca8ebf0fc8143b80]
	<?>.wasm-function[yew::html::component::lifecycle::ComponentState::render::h0d1910794859d6b1]
	<?>.wasm-function[<yew::html::component::lifecycle::RenderRunner as yew::scheduler::Runnable>::run::h07f6bc77cf92e6bf]
	<?>.wasm-function[yew::scheduler::start_now::scheduler_loop::h2391fca0bd1dcce6]
	<?>.wasm-function[yew::scheduler::start_now::{{closure}}::h9ebbc3ea421428d0]
	<?>.wasm-function[std::thread::local::LocalKey<T>::try_with::h7063850258b8f0e4]
	<?>.wasm-function[std::thread::local::LocalKey<T>::with::h3d5bf423c347928d]
	<?>.wasm-function[yew::scheduler::start_now::haef350ccb03f953b]
	<?>.wasm-function[yew::scheduler::arch::start::{{closure}}::h83e14fab35a13c99]
	<?>.wasm-function[wasm_bindgen_futures::task::singlethread::Task::run::h4422c07f2bb408aa]
	<?>.wasm-function[wasm_bindgen_futures::queue::QueueState::run_all::h999d32b47d843add]
	<?>.wasm-function[wasm_bindgen_futures::queue::Queue::new::{{closure}}::h53319a43ed85aba3]
	<?>.wasm-function[<dyn core::ops::function::FnMut<(A,)>+Output = R as wasm_bindgen::closure::WasmClosure>::describe::invoke::h31f67d380e89dea9]
	wasm-stub
	__wbg_adapter_21 (tet-ui-e492346f7f694496.js:224:135)
	real (tet-ui-e492346f7f694496.js:193)

To reproduce it I did :

1. Fresh manjaro installation
2. setup rustup
3. cargo install create-tauri-app tauri-cli trunk
4. Create a Tauri app using cargo create-tauri-app
5. Select Rust as front-end language
6. Select Leptos or Yew or Sycamore as UI template.
7. Run the app using cargo tauri dev
8. Open developer console to check for crashes
9. Right-Click Reload until you get the crashes

Note that I had to Right-Click->Reload many times to trigger the crash (sometimes 20+ times).

Do you have any clue on this ?

Thanks