dioxus icon indicating copy to clipboard operation
dioxus copied to clipboard
Published 1 month ago • verified publisher icon DioxusLabs

with “dioxus::desktop::window().new_window()” to create a new window，The program will crash and crash.

Open uefva opened this issue 1 year ago • 9 comments 

After clicking on the input box, the program froze and crashed. I tried using examples/popup.rs and encountered the same problem. My computer is running on Windows 11 system

pub fn create_topology_handle(mut address: Signal<String>) -> Coroutine<String> {
    use_coroutine(move |mut rx: UnboundedReceiver<String>| async move {
        while let Some(message) = rx.next().await {
            address.set(message);
        }
    })
}

pub fn topology_window(address: Signal<String>) {
    let tx = create_topology_handle(address).tx();
    dioxus::desktop::window().new_window(
        VirtualDom::new_with_props(
            topology_popup,
            Rc::new(move |s| match tx.unbounded_send(s) {
                Ok(_) => {}
                Err(error) => {
                    println!("{}", error);
                }
            }),
        ),
        Default::default(),
    );
}

pub fn topology_popup(send: Rc<dyn Fn(String)>) -> Element {


thread 'main' panicked at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\node.rs:70:49:
already borrowed: BorrowMutError
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library\std\src\panicking.rs:652
   1: core::panicking::panic_fmt
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library\core\src\panicking.rs:72
   2: core::cell::panic_already_borrowed
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library\core\src\cell.rs:785
   3: core::cell::RefCell<slab::Slab<dioxus_core::nodes::VNodeMount> >::borrow_mut<slab::Slab<dioxus_core::nodes::VNodeMount> >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\core\src\cell.rs:1076
   4: dioxus_core::nodes::VNode::move_mount_to
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\node.rs:70
   5: dioxus_core::nodes::VNode::diff_node<dioxus_interpreter_js::write_native_mutations::MutationState>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\node.rs:38
   6: dioxus_core::diff::component::impl$0::diff_scope::closure$0<dioxus_interpreter_js::write_native_mutations::MutationState>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\component.rs:54
   7: dioxus_core::runtime::Runtime::with_scope_on_stack<tuple$<>,dioxus_core::diff::component::impl$0::diff_scope::closure_env$0<dioxus_interpreter_js::write_native_mutations::MutationState> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\runtime.rs:189
   8: dioxus_core::virtual_dom::VirtualDom::diff_scope<dioxus_interpreter_js::write_native_mutations::MutationState>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\component.rs:41
   9: dioxus_core::virtual_dom::VirtualDom::run_and_diff_scope<dioxus_interpreter_js::write_native_mutations::MutationState>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\diff\component.rs:30
  10: dioxus_core::virtual_dom::VirtualDom::render_immediate<dioxus_interpreter_js::write_native_mutations::MutationState>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\virtual_dom.rs:596
  11: dioxus_desktop::webview::WebviewInstance::poll_vdom
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:420
  12: dioxus_desktop::app::App::poll_vdom
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\app.rs:331
  13: dioxus_desktop::launch::launch_virtual_dom_blocking::closure$0
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\launch.rs:34
  14: tao::platform_impl::platform::event_loop::impl$3::run_return::closure$0<enum2$<dioxus_desktop::ipc::UserWindowEvent>,dioxus_desktop::launch::launch_virtual_dom_blocking::closure_env$0>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop.rs:237
  15: alloc::boxed::impl$49::call_mut<tuple$<enum2$<tao::event::Event<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >,ref_mut$<enum2$<tao::event_loop::ControlFlow> > >,dyn$<core::ops::function::FnMut<tuple$<enum2$<tao::event::Event<enum2$<dioxus_desktop::ipc::U
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\alloc\src\boxed.rs:2070
  16: tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handler::closure$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop\runner.rs:250
  17: core::panic::unwind_safe::impl$25::call_once<tuple$<>,tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handler::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\core\src\panic\unwind_safe.rs:272
  18: std::panicking::try::do_call<core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handler::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >,tuple$<> > 
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panicking.rs:559
  19: alloc::vec::drain::impl$5::next<tuple$<alloc::string::String,alloc::boxed::Box<dyn$<core::ops::function::Fn<tuple$<http::request::Request<alloc::vec::Vec<u8,alloc::alloc::Global> > >,assoc$<Output,http::response::Response<enum2$<alloc::borrow::Cow<slice2$<
  20: std::panicking::try<tuple$<>,core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handler::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > > >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panicking.rs:523
  21: std::panic::catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handler::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >,tuple$<> >     
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panic.rs:149
  22: tao::platform_impl::platform::event_loop::runner::EventLoopRunner<enum2$<dioxus_desktop::ipc::UserWindowEvent> >::catch_unwind<enum2$<dioxus_desktop::ipc::UserWindowEvent>,tuple$<>,tao::platform_impl::platform::event_loop::runner::impl$3::call_event_handle
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop\runner.rs:156
  23: tao::platform_impl::platform::event_loop::runner::EventLoopRunner<enum2$<dioxus_desktop::ipc::UserWindowEvent> >::call_event_handler<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop\runner.rs:242
  24: tao::platform_impl::platform::event_loop::runner::EventLoopRunner<enum2$<dioxus_desktop::ipc::UserWindowEvent> >::send_event<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop\runner.rs:224
  25: tao::platform_impl::platform::event_loop::ThreadMsgTargetSubclassInput<enum2$<dioxus_desktop::ipc::UserWindowEvent> >::send_event<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop.rs:125
  26: tao::platform_impl::platform::event_loop::thread_event_target_callback::closure$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop.rs:2296
  27: core::ops::function::FnOnce::call_once<tao::platform_impl::platform::event_loop::thread_event_target_callback::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> >,tuple$<> >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\core\src\ops\function.rs:250
  28: core::panic::unwind_safe::impl$25::call_once<windows::Win32::Foundation::LRESULT,tao::platform_impl::platform::event_loop::thread_event_target_callback::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\core\src\panic\unwind_safe.rs:272
  29: std::panicking::try::do_call<core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::thread_event_target_callback::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >,windows::Win32::Foundation::LRESULT>
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panicking.rs:559
  30: alloc::vec::drain::impl$5::next<tuple$<alloc::string::String,alloc::boxed::Box<dyn$<core::ops::function::Fn<tuple$<http::request::Request<alloc::vec::Vec<u8,alloc::alloc::Global> > >,assoc$<Output,http::response::Response<enum2$<alloc::borrow::Cow<slice2$<
  31: std::panicking::try<windows::Win32::Foundation::LRESULT,core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::thread_event_target_callback::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > > >
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panicking.rs:523
  32: std::panic::catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<tao::platform_impl::platform::event_loop::thread_event_target_callback::closure_env$0<enum2$<dioxus_desktop::ipc::UserWindowEvent> > >,windows::Win32::Foundation::LRESULT>
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\std\src\panic.rs:149
  33: tao::platform_impl::platform::event_loop::runner::EventLoopRunner<enum2$<dioxus_desktop::ipc::UserWindowEvent> >::catch_unwind<enum2$<dioxus_desktop::ipc::UserWindowEvent>,windows::Win32::Foundation::LRESULT,tao::platform_impl::platform::event_loop::thread
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop\runner.rs:156
  34: tao::platform_impl::platform::event_loop::thread_event_target_callback<enum2$<dioxus_desktop::ipc::UserWindowEvent> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\tao-0.26.2\src\platform_impl\windows\event_loop.rs:2345
  35: DefSubclassProc
  36: DefSubclassProc
  37: DispatchMessageW
  38: DispatchMessageW
  39: windows::Win32::UI::WindowsAndMessaging::DispatchMessageA
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\windows-0.58.0\src\Windows\Win32\UI\WindowsAndMessaging\mod.rs:767
  40: webview2_com::wait_with_pump<enum2$<core::result::Result<tuple$<>,enum2$<webview2_com::Error> > > >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\webview2-com-0.33.0\src\lib.rs:78
  41: webview2_com::callback::CreateCoreWebView2ControllerCompletedHandler::wait_for_async_operation
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\webview2-com-0.33.0\src\callback.rs:114
  42: wry::webview2::InnerWebView::create_controller
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\wry-0.43.1\src\webview2\mod.rs:338
  43: wry::webview2::InnerWebView::new_in_hwnd
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\wry-0.43.1\src\webview2\mod.rs:121
  44: wry::webview2::InnerWebView::new<ref$<dyn$<raw_window_handle::borrowed::HasWindowHandle> > >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\wry-0.43.1\src\webview2\mod.rs:87
  45: wry::WebViewBuilder::build
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\wry-0.43.1\src\lib.rs:1036
  46: dioxus_desktop::webview::WebviewInstance::new
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:359
  47: dioxus_desktop::desktop_context::DesktopService::new_window
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\desktop_context.rs:105
  48: desktop::components::topology_popup::topology_window
             at .\desktop\src\components\topology_popup.rs:26
  49: desktop::components::custom_component::Label_Input_Address::closure$0
             at .\desktop\src\components\custom_component.rs:67
  50: dioxus_core::events::impl$16::new::closure$2<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData>,tuple$<>,tuple$<>,tuple$<>,desktop::components::custom_component::Label_Input_Address::closure_env$0>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:451
  51: alloc::boxed::impl$49::call_mut<tuple$<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData> >,dyn$<core::ops::function::FnMut<tuple$<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData> >,assoc$<Output,tuple$<> > > >,alloc::alloc:
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\alloc\src\boxed.rs:2070
  52: dioxus_core::events::impl$16::call::closure$0<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData>,tuple$<> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:485
  53: dioxus_core::runtime::Runtime::with_scope_on_stack<tuple$<>,dioxus_core::events::impl$16::call::closure_env$0<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData>,tuple$<> > >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\runtime.rs:189
  54: dioxus_core::events::Callback<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData>,tuple$<> >::call<dioxus_core::events::Event<dioxus_html::events::mouse::MouseData>,tuple$<> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:485
  55: dioxus_html::events::mouse::onclick::closure$0<dioxus_core::events::MarkerWrapper<tuple$<> >,desktop::components::custom_component::Label_Input_Address::closure_env$0>
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-html-0.6.0-alpha.3\src\events\mod.rs:33
  56: dioxus_core::nodes::impl$21::listener::closure$0<dioxus_html::events::PlatformEventData,dioxus_html::events::mouse::onclick::closure_env$0<dioxus_core::events::MarkerWrapper<tuple$<> >,desktop::components::custom_component::Label_Input_Address::closure_env
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\nodes.rs:777
  57: dioxus_core::events::impl$16::leak::closure$2<dioxus_core::events::Event<dyn$<core::any::Any> >,tuple$<>,dioxus_core::nodes::impl$21::listener::closure_env$0<dioxus_html::events::PlatformEventData,dioxus_html::events::mouse::onclick::closure_env$0<dioxus_c
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:466
  58: alloc::boxed::impl$49::call_mut<tuple$<dioxus_core::events::Event<dyn$<core::any::Any> > >,dyn$<core::ops::function::FnMut<tuple$<dioxus_core::events::Event<dyn$<core::any::Any> > >,assoc$<Output,tuple$<> > > >,alloc::alloc::Global>
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\alloc\src\boxed.rs:2070
  59: dioxus_core::events::impl$16::call::closure$0<dioxus_core::events::Event<dyn$<core::any::Any> >,tuple$<> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:485
  60: dioxus_core::runtime::Runtime::with_scope_on_stack<tuple$<>,dioxus_core::events::impl$16::call::closure_env$0<dioxus_core::events::Event<dyn$<core::any::Any> >,tuple$<> > >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\runtime.rs:189
  61: dioxus_core::events::Callback<dioxus_core::events::Event<dyn$<core::any::Any> >,tuple$<> >::call<dioxus_core::events::Event<dyn$<core::any::Any> >,tuple$<> >
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\events.rs:485
  62: dioxus_core::runtime::Runtime::handle_bubbling_event
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\runtime.rs:378
  63: dioxus_core::runtime::Runtime::handle_event
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-core-0.6.0-alpha.3\src\runtime.rs:299
  64: dioxus_desktop::webview::WebviewEdits::handle_html_event
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:121
  65: dioxus_desktop::webview::WebviewEdits::try_handle_event
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:59
  66: dioxus_desktop::webview::WebviewEdits::handle_event
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:50
  67: dioxus_desktop::protocol::desktop_handler
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\protocol.rs:169
  68: dioxus_desktop::webview::impl$1::new::closure$0
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\dioxus-desktop-0.6.0-alpha.3\src\webview.rs:221
  69: alloc::boxed::impl$50::call<tuple$<http::request::Request<alloc::vec::Vec<u8,alloc::alloc::Global> >,wry::RequestAsyncResponder>,dyn$<core::ops::function::Fn<tuple$<http::request::Request<alloc::vec::Vec<u8,alloc::alloc::Global> >,wry::RequestAsyncResponde
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\alloc\src\boxed.rs:2077
  70: wry::webview2::impl$3::attach_custom_protocol_handler::closure$0
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\wry-0.43.1\src\webview2\mod.rs:867
  71: alloc::boxed::impl$49::call_mut<tuple$<enum2$<core::option::Option<webview2_com_sys::Microsoft::Web::WebView2::Win32::ICoreWebView2> >,enum2$<core::option::Option<webview2_com_sys::Microsoft::Web::WebView2::Win32::ICoreWebView2WebResourceRequestedEventArgs
             at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23\library\alloc\src\boxed.rs:2070
  72: webview2_com::callback::impl$551::Invoke
             at C:\Users\songy\.cargo\registry\src\rsproxy.cn-0dccff568467c15b\webview2-com-0.33.0\src\callback.rs:341

uefva avatar Oct 21 '24 02:10 uefva

I can reproduce this on Windows 10 with the popup example except I get a different error:

thread 'main' panicked at packages\generational-box\src\unsync.rs:253:47:
already borrowed: BorrowMutError

The windows freezing and the new window not mounting act the same.

I also tested this on Linux with the only issue being that the new window couldn't be closed but otherwise, it worked without error.

DogeDark avatar Oct 21 '24 18:10 DogeDark

Yes, I have encountered this error in the Popup example before, but when I used a similar method to write other programs, I encountered an error that is different from Popup popup_error

uefva avatar Oct 22 '24 01:10 uefva

Hi @DogeDark,

I'm currently working on fixing the already borrowed error (), especially around get_split_ref and get_split_mut. I’m digging into potential conflicts in recursive borrowing and exploring ways to prevent these issues from recurring. Could you assign this issue to me so I can continue making progress?

About the error : The already borrowed error typically occurs in Rust when a **RefCell** is borrowed as immutable or mutable while there is already another active borrow that conflicts with the new one. This issue often arises in single-threaded environments when there are overlapping Ref and RefMut borrows, and Rust's borrow checker catches this.

Thank You for your help!

Rahul721999 avatar Nov 03 '24 03:11 Rahul721999

Hi everyone,

After spending some time debugging this, I think I’ve identified what seems to be causing the problem.

It initially appeared that borrow_mut in unsync.rs might be the source of the issue (cause we are providing mut ref within a loop). However, after a closer look, unsync.rs actually seems to be functioning as expected. The real issue seems related to the desktop::window().new_window() method when creating a secondary window.

The problem can be consistently reproduced by running the multiwindow.rs or popup.rs examples. When there is already an active primary window and a new window is created, the new window appears but does not render content properly.

The already_borrow error occurs specifically when attempting to close the primary window before the new window. Since we’re unable to close the new popup window (as it gets stuck), the mutable reference (from RefCell) remains borrowed by the new window, leading to this error.

This suggests that the borrowing conflict might stem from how .new_window() method handles the references when the primary window is still active.

As of now, I'm still working on this, trying to figure out the issue. I'm focusing on these potential causes:

  1. Why the new window is not getting rendered properly with the window().new_window() method.
    • Could this be an issue with the SharedContext in the DesktopService?
    • Could it be related to the VirtualDom from the WebviewInstance struct?

Hope this helps clarify the issue! I’ll update as I learn more, and please let me know if there’s any additional insight you have.

Rahul721999 avatar Nov 04 '24 17:11 Rahul721999

Addressing Window Creation Blockage in Multi-Window Setup

Hi @ealmloff @DogeDark,

~It's not a Fix , rahter a workaround for now.~

After several days of debugging this issue, here's what I found and the steps I followed: Steps:

  1. I dug very deep into various methods, such as window.new_window(), creating a new WebInstance, setting up a new Virtual DOM and Config, and experimenting with the wry library.
  2. I focused especially on the the WebView.build() method which I found was getting stuck during second window creation , async code in the create_controller function.
  3. During my investigation, I found that something might be blocking the main thread, potentially causing the mpsc channel to be blocked or waiting indefinitely.
  4. To test this, I added timers at different places between creating the primary window and the second window to see if any delays would resolve the issue.
  5. After this experimentation, I came up with a solution involving multi-threading and async functions. While this might not be the most optimal solution, I believe it's a good workaround. There should ideally be a better way to create windows without spinning up a new thread.

Solution:

  • I am now using separate threads to create the new window.

That said, I’m very open to any suggestions or alternative solutions that might be more efficient or better aligned with the intended design.

_

NOTE: I've also updated the example documentation for using .new_window() to guide users through the process.

Rahul721999 avatar Nov 06 '24 09:11 Rahul721999

Sorry, I didn't open GitHub to view the information a while ago. Thank you for your detailed answer. If I have any new discoveries in the future, I will communicate with you in detail

uefva avatar Nov 07 '24 04:11 uefva

I have found that the last working commit was 8b62b71e2d687d0b6fc92872697a644352879688 before #2792 (cab573eefd28bde49ed4d162e5e5c46321e1cdf6) was merged. Something in there is causing CreateCoreWebView2Controller to block indefinitely.

Update - CreateCoreWebView2Controller isn't blocking, it's the CreateCoreWebView2ControllerCompletedHandler::wait_for_async_operation which is blocking and never moves onto the rx.recv(). Creating the actual webview succeeds.

DogeDark avatar Jan 28 '25 08:01 DogeDark

Are there any updates on this issue? It is still not working for me on windows 10

yzobus avatar May 08 '25 08:05 yzobus

Same on Windows 11 - new_window blocks indefinitely.

bartoszkp avatar May 16 '25 16:05 bartoszkp

I think this is the same issue as https://github.com/tauri-apps/wry/issues/583 and this related windows behavior: https://learn.microsoft.com/en-us/microsoft-edge/webview2/concepts/threading-model#reentrancy

Our code lets you call new_window from the synchronous event handler which would be reentrant. We need to queue the event and then handle it after the event handler is finished. The spawn workaround effectively does that with the dioxus task queue, but it would be more clear to use the wry custom event queue

ealmloff avatar Jun 19 '25 15:06 ealmloff