Segfault of binary produced with relocation-model=static for x86_64-unknown-linux-musl

[haraldh]

I tried this code:

fn main() {
    println!("main = {:#x}", &main as *const _ as usize);
}

I expected to see this happen:

$ rustc -C relocation-model=static --target x86_64-unknown-linux-musl hello.rs
$ ./hello
main = 0x43b008

Instead, this happened:

$ rustc -C relocation-model=static --target x86_64-unknown-linux-musl hello.rs
$ ./hello
Segmentation fault (core dumped)

This code works, though:

fn main() {
    println!("main = {:#?}", &main as *const _);
}

Meta

Also happens with current nightly.

rustc --version --verbose:

$ rustc --version --verbose
rustc 1.44.1 (c7087fe00 2020-06-17)
binary: rustc
commit-hash: c7087fe00d2ba919df1d813c040a5d47e43b0fe7
commit-date: 2020-06-17
host: x86_64-unknown-linux-gnu
release: 1.44.1
LLVM version: 9.0
 
$ rustc +nightly --version --verbose
rustc 1.46.0-nightly (6bb3dbfc6 2020-06-22)
binary: rustc
commit-hash: 6bb3dbfc6c6d8992d08431f320ba296a0c2f7498
commit-date: 2020-06-22
host: x86_64-unknown-linux-gnu
release: 1.46.0-nightly
LLVM version: 10.0

[haraldh]

CC: @petrochenkov

[haraldh]

opt levels other than -C opt-level=0 do not segfault.

[LeSeulArtichaut]

Assigning P-medium as discussed as part of the Prioritization WG procedure.