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20 hours ago •
godot-rust
godot-rust
_Virtual trait functions unable to handle panic
I have discovered that when a panic occurs in the _Virtual trait functions; such as init, ready, draw, and process; the game (or editor in the case of init) would hang for a few seconds then silently close. When the game crashes, the errors do not appear in the error tab as expected. When observing the terminal during the init and ready crashes, the following backtraces are generated
Initialize GDExtension API for Rust: Godot Engine v4.1.1.stable.arch_linux
Godot Engine v4.1.1.stable.arch_linux - https://godotengine.org
Vulkan API 1.3.246 - Forward Mobile - Using Vulkan Device #0: Intel - Intel(R) Graphics (ADL GT2)
thread '<unnamed>' panicked at 'init', src/error_test.rs:23:9
stack backtrace:
0: 0x7f96a4f9d15a - std::backtrace_rs::backtrace::libunwind::trace::h9a6b80bbf328ba5d
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f96a4f9d15a - std::backtrace_rs::backtrace::trace_unsynchronized::hd162ec543a11886b
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f96a4f9d15a - std::sys_common::backtrace::_print_fmt::h78a5099be12f51a6
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:65:5
3: 0x7f96a4f9d15a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha1c5390454d74f71
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f96a4fbb15f - core::fmt::write::h9ffde816c577717b
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/fmt/mod.rs:1254:17
5: 0x7f96a4f9add5 - std::io::Write::write_fmt::h88186074961638e4
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/io/mod.rs:1698:15
6: 0x7f96a4f9cf25 - std::sys_common::backtrace::_print::h184198273ed08d59
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:47:5
7: 0x7f96a4f9cf25 - std::sys_common::backtrace::print::h1b4d8e7add699453
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:34:9
8: 0x7f96a4f9e61e - std::panicking::default_hook::{{closure}}::h393bcea75423915a
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:269:22
9: 0x7f96a4f9e3c5 - std::panicking::default_hook::h48c64f31d8b3fd03
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:288:9
10: 0x7f96a4f9ed04 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb9b860f5a1175bda
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/alloc/src/boxed.rs:1987:9
11: 0x7f96a4f9ed04 - std::panicking::rust_panic_with_hook::hafdc493a79370062
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:695:13
12: 0x7f96a4f9ea32 - std::panicking::begin_panic_handler::{{closure}}::h0a64bc82e36bedc7
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:580:13
13: 0x7f96a4f9d5c6 - std::sys_common::backtrace::__rust_end_short_backtrace::hc203444fb7416a16
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:150:18
14: 0x7f96a4f9e7d2 - rust_begin_unwind
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:578:5
15: 0x7f96a4e0ddc3 - core::panicking::panic_fmt::h0f6ef0178afce4f2
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/panicking.rs:67:14
16: 0x7f96a4e1fff2 - <error_test::error_test::ErrorTest as godot_core::gen::classes::node_2d::re_export::Node2DVirtual>::init::hbd4e58a5da555462
at /home/puwa/Documents/godot/error-test/error_test/src/error_test.rs:23:3
17: 0x7f96a4e2039d - <error_test::error_test::ErrorTest as godot_core::obj::traits::cap::GodotInit>::__godot_init::ha487a0799e2d7c34
at /home/puwa/Documents/godot/error-test/error_test/src/error_test.rs:20:1
18: 0x7f96a4e213e7 - core::ops::function::FnOnce::call_once::h2ca7cd0ec9a6e389
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/ops/function.rs:250:5
19: 0x7f96a4e10400 - godot_core::registry::callbacks::create_custom::h05735c1377c382d5
at /home/puwa/.cargo/git/checkouts/gdext-76630c89719e160c/0d4670f/godot-core/src/registry.rs:316:29
20: 0x7f96a4e109da - godot_core::registry::callbacks::create::he575195e9301cb6d
at /home/puwa/.cargo/git/checkouts/gdext-76630c89719e160c/0d4670f/godot-core/src/registry.rs:299:9
21: 0x55e2bbceb8b2 - <unknown>
22: 0x55e2b8f19d1e - <unknown>
23: 0x55e2b8f64210 - <unknown>
24: 0x55e2bbf7108c - <unknown>
25: 0x55e2b90bc0cc - <unknown>
26: 0x55e2b82d0bfb - <unknown>
27: 0x55e2b823288d - <unknown>
28: 0x7f96b2627cd0 - <unknown>
29: 0x7f96b2627d8a - __libc_start_main
30: 0x55e2b82413e5 - <unknown>
31: 0x0 - <unknown>
fatal runtime error: failed to initiate panic, error 5
Initialize GDExtension API for Rust: Godot Engine v4.1.1.stable.arch_linux
Godot Engine v4.1.1.stable.arch_linux - https://godotengine.org
Vulkan API 1.3.246 - Forward Mobile - Using Vulkan Device #0: Intel - Intel(R) Graphics (ADL GT2)
thread '<unnamed>' panicked at 'ready', src/error_test.rs:33:13
stack backtrace:
0: 0x7f33e2b9d13a - std::backtrace_rs::backtrace::libunwind::trace::h9a6b80bbf328ba5d
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f33e2b9d13a - std::backtrace_rs::backtrace::trace_unsynchronized::hd162ec543a11886b
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f33e2b9d13a - std::sys_common::backtrace::_print_fmt::h78a5099be12f51a6
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:65:5
3: 0x7f33e2b9d13a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha1c5390454d74f71
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f33e2bbb13f - core::fmt::write::h9ffde816c577717b
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/fmt/mod.rs:1254:17
5: 0x7f33e2b9adb5 - std::io::Write::write_fmt::h88186074961638e4
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/io/mod.rs:1698:15
6: 0x7f33e2b9cf05 - std::sys_common::backtrace::_print::h184198273ed08d59
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:47:5
7: 0x7f33e2b9cf05 - std::sys_common::backtrace::print::h1b4d8e7add699453
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:34:9
8: 0x7f33e2b9e5fe - std::panicking::default_hook::{{closure}}::h393bcea75423915a
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:269:22
9: 0x7f33e2b9e3a5 - std::panicking::default_hook::h48c64f31d8b3fd03
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:288:9
10: 0x7f33e2b9ece4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb9b860f5a1175bda
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/alloc/src/boxed.rs:1987:9
11: 0x7f33e2b9ece4 - std::panicking::rust_panic_with_hook::hafdc493a79370062
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:695:13
12: 0x7f33e2b9ea12 - std::panicking::begin_panic_handler::{{closure}}::h0a64bc82e36bedc7
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:580:13
13: 0x7f33e2b9d5a6 - std::sys_common::backtrace::__rust_end_short_backtrace::hc203444fb7416a16
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/sys_common/backtrace.rs:150:18
14: 0x7f33e2b9e7b2 - rust_begin_unwind
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/std/src/panicking.rs:578:5
15: 0x7f33e2a0ddc3 - core::panicking::panic_fmt::h0f6ef0178afce4f2
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/panicking.rs:67:14
16: 0x7f33e2a2003a - <error_test::error_test::ErrorTest as godot_core::gen::classes::node_2d::re_export::Node2DVirtual>::ready::h8fe1ad89c81c02b7
at /home/puwa/Documents/godot/error-test/error_test/src/error_test.rs:33:13
17: 0x7f33e2a12e5c - <error_test::error_test::ErrorTest as godot_core::obj::traits::cap::ImplementsGodotVirtual>::__virtual_call::function::{{closure}}::h27317f4e62209e8d
at /home/puwa/Documents/godot/error-test/error_test/src/error_test.rs:20:1
18: 0x7f33e2a21f78 - core::ops::function::FnOnce::call_once::hfd3384b0f710c6f9
at /rustc/90c541806f23a127002de5b4038be731ba1458ca/library/core/src/ops/function.rs:250:5
19: 0x7f33e2a151d1 - <(R,) as godot_core::builtin::meta::signature::PtrcallSignatureTuple>::in_ptrcall::h845ed434cefa927d
at /home/puwa/.cargo/git/checkouts/gdext-76630c89719e160c/0d4670f/godot-core/src/builtin/meta/signature.rs:274:38
20: 0x7f33e2a204ad - <error_test::error_test::ErrorTest as godot_core::obj::traits::cap::ImplementsGodotVirtual>::__virtual_call::function::hfa8777e53b945c27
at /home/puwa/Documents/godot/error-test/error_test/src/error_test.rs:20:1
21: 0x557282de7e78 - <unknown>
22: 0x557284392e38 - <unknown>
23: 0x5572827e4d66 - <unknown>
24: 0x5572827e4d04 - <unknown>
25: 0x5572827e4d04 - <unknown>
26: 0x557282810263 - <unknown>
27: 0x557282867973 - <unknown>
28: 0x5572809738ab - <unknown>
29: 0x7f33f0227cd0 - <unknown>
30: 0x7f33f0227d8a - __libc_start_main
31: 0x5572809823e5 - <unknown>
32: 0x0 - <unknown>
fatal runtime error: failed to initiate panic, error 5
It is also worth noting that whenever a #[func] function is triggered via a signal or a deferred call (the callee's panic is handled by the call function, however the caller panics due to a "method not found" error), the error is handled with no issues
I encountered this as well. I noticed when I ran the scene directly from the command line, the panic error message was printed out. but not inside the godot editor.
I have a branch of my project which will demo this bug when running the rust implementation: https://github.com/dsmiller95/MazePerformanceGrade/blob/panic-example/rust/src/maze_scripts/floor_creator.rs#L37-L41
from what i have checked it appears that godot-core's handle_panic is not applying to these functions, though i am not yet familiar enough with the codebase (mostly regarding the macros) to understand how it's working properly with #[func] functions. the only three instances i have found don't seem to reveal why one should work and the other shouldn't