Incorrect behavior on Windows with dylibs and ThinLTO #127979
Description
edit by @Noratrieb: MCVE: https://github.com/bash/rust-dylib-crash
I tried this code:
Clone https://github.com/TheBevyFlock/bevy_quickstart and run cargo run --release on Windows
I expected to see this happen: Literally anything else than the standard library hitting unreachable code.
Instead, this happened: We hit this line of unreachable code: https://github.com/rust-lang/rust/blob/22a5267c83a3e17f2b763279eb24bb632c45dc6b/library/std/src/sys/sync/once/futex.rs
Meta
rustc --version --verbose:
rustc 1.81.0-nightly (5affbb171 2024-07-18) binary: rustc commit-hash: 5affbb17153bc69a9d5d8d2faa4e399a014a211e commit-date: 2024-07-18 host: x86_64-pc-windows-msvc release: 1.81.0-nightly LLVM version: 18.1.7 
Backtrace
thread 'main' panicked at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e\library\std\src\sync\once.rs:217:20: internal error: entered unreachable code: state is never set to invalid values stack backtrace: 0: 0x7ffae5f03e3d - std::backtrace_rs::backtrace::dbghelp64::trace at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91 1: 0x7ffae5f03e3d - std::backtrace_rs::backtrace::trace_unsynchronized at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66 2: 0x7ffae5f03e3d - std::sys::backtrace::_print_fmt at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\sys\backtrace.rs:65 3: 0x7ffae5f03e3d - std::sys::backtrace::impl$0::print::impl$0::fmt at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\sys\backtrace.rs:40 4: 0x7ffae5f34639 - core::fmt::rt::Argument::fmt at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\core\src\fmt\rt.rs:173 5: 0x7ffae5f34639 - core::fmt::write at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\core\src\fmt\mod.rs:1182 6: 0x7ffae5efa941 - std::io::Write::write_fmt<std::sys::pal::windows::stdio::Stderr> at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\io\mod.rs:1827 7: 0x7ffae5f06ed7 - std::panicking::default_hook::closure$1 at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:269 8: 0x7ffae5f06ac9 - std::panicking::default_hook at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:296 9: 0x7ffae5f076e2 - std::panicking::rust_panic_with_hook at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:800 10: 0x7ffae5f074ef - std::panicking::begin_panic_handler::closure$0 at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:667 11: 0x7ffae5f047af - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$> at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\sys\backtrace.rs:168 12: 0x7ffae5f07106 - std::panicking::begin_panic_handler at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:665 13: 0x7ffae5f5d6b4 - core::panicking::panic_fmt at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\core\src\panicking.rs:74 14: 0x7ff7dfc60e01 - main 15: 0x7ff7dfc5e391 - main 16: 0x7ff7dfc5cc95 - main 17: 0x7ffade9fe3e2 - bevy_app::app::App::add_boxed_plugin::he4742dca059e0ec1 18: 0x7ff7dfc42aff - main 19: 0x7ff7dfc4104f - main 20: 0x7ff7dfc4103e - main 21: 0x7ffae5eeb969 - std::rt::lang_start_internal::closure$2 at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\rt.rs:141 22: 0x7ffae5eeb969 - std::panicking::try::do_call at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:557 23: 0x7ffae5eeb969 - std::panicking::try at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panicking.rs:521 24: 0x7ffae5eeb969 - std::panic::catch_unwind at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\panic.rs:350 25: 0x7ffae5eeb969 - std::rt::lang_start_internal at /rustc/5affbb17153bc69a9d5d8d2faa4e399a014a211e/library\std\src\rt.rs:141 26: 0x7ff7dfc42cec - main 27: 0x7ff7dfcd5ba0 - invoke_main at D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78 28: 0x7ff7dfcd5ba0 - __scrt_common_main_seh at D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288 29: 0x7ffc426a257d - BaseThreadInitThunk 30: 0x7ffc4366af28 - RtlUserThreadStart error: process didn't exit successfully: `target\release\bevy_quickstart.exe` (exit code: 101)