Rust 1.65 - failed assert_eq! causes crash with SIGSEGV

[wg]

I tried this code:

assert_eq!("foo", "bar");

I expected the program to panic with an assertion failed message and exit normally:

% cargo +1.64.0 run
    Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `target/debug/test-segv`
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `"foo"`,
 right: `"bar"`', src/main.rs:7:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Instead, the program crashes with a segfault:

% cargo +1.65.0 run
    Finished dev [unoptimized + debuginfo] target(s) in 0.15s
     Running `target/debug/test-segv`
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `"foo"`,
 right: `"bar"`', src/main.rs:7:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
zsh: segmentation fault  cargo +1.65.0 run

This is particularly a problem with tests since the test harness doesn't print the failed assert:

running 1 test
error: test failed, to rerun pass `--bin test-segv`

Caused by:
  process didn't exit successfully: `.../target/debug/deps/test_segv-1bd8c9f311fdbb76` (signal: 11, SIGSEGV: invalid memory reference)

This crash occurs on aarch64-apple-darwin, it does not occur on aarch64-unknown-linux-gnu

Meta

% cargo +1.65.0 rustc -- --version --verbose
   Compiling test-segv v0.0.1 (/Users/will/src/rust-play/test-segv)
rustc 1.65.0 (897e37553 2022-11-02)
binary: rustc
commit-hash: 897e37553bba8b42751c67658967889d11ecd120
commit-date: 2022-11-02
host: aarch64-apple-darwin
release: 1.65.0
LLVM version: 15.0.0

Backtrace

Backtrace from lldb:

* thread #1, name = 'main', queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001ca48f4f4 libunwind.dylib`libunwind::CFI_Parser<libunwind::LocalAddressSpace>::decodeFDE(libunwind::LocalAddressSpace&, unsigned long, libunwind::CFI_Parser<libunwind::LocalAddressSpace>::FDE_Info*, libunwind::CFI_Parser<libunwind::LocalAddressSpace>::CIE_Info*) + 48
    frame #1: 0x00000001ca49159c libunwind.dylib`libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_arm64>::step() + 204
    frame #2: 0x00000001ca493314 libunwind.dylib`_Unwind_RaiseException + 468
    frame #3: 0x000000010001a3e0 test-segv`rust_panic at panicking.rs:746:9 [opt]

[wg]

Oops sorry this is a duplicate of #104388 caused by using -C link-arg=--ld-path=/opt/homebrew/opt/llvm/bin/ld64.lld from LLVM 14.0.6_1. The crash does not occur without that link arg flag, and also doesn't occur after upgrading to LLVM 15.0.4.

[skyzh]

I believe this is caused by using ld from LLVM 14 to link artifacts produced by LLVM 15. Seems to dup w/ #104388 but it seems that you have a smaller reproducible code. Could you please share your MCVE?