Rust 1.83.0 Sync with dyn Traits Regression

[IGN-Styly]

Code

Problematic Version: rustc 1.83.0 (90b35a6 2024-11-26)
Works on rust rustc 1.82.0 (f6e511e 2024-10-15)

Using my lib, here's a short example causing the segfault.
Issue Demo Requires Submodule!
SegFault

Thread 1 "server" received signal SIGSEGV, Segmentation fault.
alloc::sync::{impl#29}::deref<dyn enginelib::event::EventHandler, alloc::alloc::Global> (self=0x555555d77db0)
    at /home/styly/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/sync.rs:2179
2179	        &self.inner().data

Rust 1.83 seems just leak. #128778 may be the cause but i can't seem to compile rust at all.

[compiler-errors]

What is the regression here? I don't think you mentioned what the problem actually is.

[IGN-Styly]

Compilation happens fine but on execution a segfault happens, which didn't happen on previous versions. My bets are on: #128778 i am currently testing.

[IGN-Styly]

@compiler-errors I Just made my lib oss, and updated issue to have code to recreate the bug.

[apiraino]

@IGN-Styly can you please update your report adding how do you build your library. That would help in reproducing more quickly the issue. Thank you.

[jieyouxu]

More specifically, can you also make your example self-contained, e.g. in a repo, so that we can confirm what we try to run is the same as what you try to run?

[IGN-Styly]

yes will do asap

[IGN-Styly]

Have Updated to include a repo to easily recreate the bug.

[cyrgani]

Can reproduce, working on minimizing this.

@rustbot label: -S-needs-repro -S-needs-info