Android BorrowError panic in wry and inability to restart/launch

[tristan-morris]

Describe the bug
I'm attempting to run Tauri on an existing prod React project. I have been encountering a panic somewhat reliably after a deep-link is called (user goes to complete oauth flow, deep-link drops them back in the app successfully - this works great). However, on next app launch it seems like the deep-link state is still present and causes a panic. This panic is then irrecoverable. Force-quit the tauri app = panic. Try and force-quit again and panic. App is then dead mostly. Sometimes it will come back, as if a bad event has been dispatched successfully. Delete the app from the device and it can be reliably installed.

I have been able to cause the same set of panics with a similar flow - when there's competition for launching the WebKitClient(?).

I haven't made much more progress on this issue but happy to keep looking into it.

Steps To Reproduce

• Install Tauri
• Install deep-link plugin (may not entirely be necessary - I've caused it other ways but this seems semi reliable)
• Configure a deep link
• Trigger a deep-link to arrive back in app
• Close the app (kill)
• Re-launch the app.

Expected behavior
No panic.

Screenshots
Panic:

References:

Platform and Versions (please complete the following information):
OS: Android on Pixel 4a 5G. I am port forwarding from the Android device to my dev PC.
Rustc: 1.82

Additional context

Logcat Output during the panic (nothing useful beyond the reference to unwinding panic):

...snip...
11-17 08:26:34.924 18908 18908 F DEBUG   :       #08 pc 00000000015c3db8  /data/app/~~XWb8Z89T6mNxIkk6s7bm2A==/io.testy.ui-7cAR2kQUjsQd7GVdttgacA==/base.apk (offset 0x5e8000) (core::panicking::panic_cannot_unwind::he22847d5ac2210b8+20)
11-17 08:26:34.924 18908 18908 F DEBUG   :       #09 pc 0000000000a1c4d8  /data/app/~~XWb8Z89T6mNxIkk6s7bm2A==/io.testy.ui-7cAR2kQUjsQd7GVdttgacA==/base.apk (offset 0x5e8000) (Java_io_testy_ui_RustWebViewClient_withAssetLoader+36)
11-17 08:26:34.924 18908 18908 F DEBUG   :       #10 pc 0000000000384370  /apex/com.android.art/lib64/libart.so (art_quick_generic_jni_trampoline+144) (BuildId: 3f7d5a016e08d528f129bdd336d81168)

Full Logcat output: https://gist.github.com/tristan-morris/44dd5f7e451f6f81d260c7a56b14afa4

$ cargo tauri info

[✔] Environment
- OS: Ubuntu 23.4.0 x86_64 (X64)
✔ webkit2gtk-4.1: 2.42.4
✔ rsvg2: 2.54.5
✔ rustc: 1.82.0 (f6e511eec 2024-10-15)
✔ cargo: 1.82.0 (8f40fc59f 2024-08-21)
✔ rustup: 1.27.1 (54dd3d00f 2024-04-24)
✔ Rust toolchain: stable-x86_64-unknown-linux-gnu (environment override by RUSTUP_TOOLCHAIN)
- node: 21.5.0
- yarn: 1.22.21
- npm: 10.2.4

[-] Packages
- tauri 🦀: 2.1.1
- tauri-build 🦀: 2.0.3
- wry 🦀: 0.47.0
- tao 🦀: 0.30.8
- tauri-cli 🦀: 2.1.0
- @tauri-apps/api : 2.1.1
- @tauri-apps/cli : 2.1.0

[-] Plugins
- tauri-plugin-log 🦀: 2.0.2
- @tauri-apps/plugin-log : not installed!
- tauri-plugin-notification 🦀: 2.0.1
- @tauri-apps/plugin-notification : 2.0.0
- tauri-plugin-shell 🦀: 2.0.2
- @tauri-apps/plugin-shell : 2.0.1
- tauri-plugin-geolocation 🦀: 2.0.1
- @tauri-apps/plugin-geolocation : 2.0.0
- tauri-plugin-deep-link 🦀: 2.0.1
- @tauri-apps/plugin-deep-link : 2.0.0
- tauri-plugin-fs 🦀: 2.0.3
- @tauri-apps/plugin-fs : 2.0.2

[-] App
- build-type: bundle
- CSP: unset
- frontendDist: ../dist
- devUrl: http://localhost:3000/
- framework: React
- bundler: Rollup

[nic96]

I'm getting a similar error. I'm using MapLibre GL JS in tauri on android and occasionally while zooming/panning around in the map I get a crash:

11-18 16:02:05.774 28302 28340 I RustStdoutStderr: thread '<unnamed>' panicked at /home/nic96/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wry-0.47.1/src/android/binding.rs:109:42:
11-18 16:02:05.774 28302 28340 I RustStdoutStderr: already mutably borrowed: BorrowError
11-18 16:02:05.774 28302 28340 I RustStdoutStderr: note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
11-18 16:02:05.775 28302 28340 I RustStdoutStderr: thread '<unnamed>' panicked at /home/nic96/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wry-0.47.1/src/android/binding.rs:109:42:
11-18 16:02:05.775 28302 28340 I RustStdoutStderr: already mutably borrowed: BorrowError
11-18 16:02:05.776 28302 28340 I RustStdoutStderr: thread '<unnamed>' panicked at library/core/src/panicking.rs:221:5:
11-18 16:02:05.776 28302 28340 I RustStdoutStderr: panic in a function that cannot unwind
11-18 16:02:05.776 28302 28340 I RustStdoutStderr: stack backtrace:
...

[tristan-morris]

Interesting! Thanks for the report as it helped confirm my sanity.

I'm using Mapbox Gl Js so it could relate somehow. As a counter point, I haven't had any crashes (past hour or two) when dev'ing on my Mac M1, but my much more performant PC panics.