ICE: `!tcx.is_mutable_static(def_id)` (`#[linkage = "weak"]`)

[matthiaskrgr]

from https://github.com/rust-lang/rust/issues/59062 auto-reduced (treereduce-rust):

#![feature(linkage)]

fn main() {
    extern "C" {
        #[linkage = "weak"]
        static mut ABC: *const u8;
    }

    unsafe {
        assert_eq!(ABC as usize, 0);
    }
}

original:

#![feature(linkage)]

fn main() {
    extern {
        #[linkage = "weak"]
        static mut ABC: *const u8;
    }

    {
        #[no_mangle]
        static mut ABC: *const u8 = 1 as *const u8;
    }

    unsafe { assert_eq!(ABC as usize, 0); }
}

Version information

rustc 1.79.0-nightly (185272822 2024-03-30)
binary: rustc
commit-hash: 18527282244431f597720e4fd42199e7333cc1c1
commit-date: 2024-03-30
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

Command: /home/matthias/.rustup/toolchains/master/bin/rustc -Zcodegen-backend=cranelift

Program output

thread 'rustc' panicked at src/constant.rs:261:9:
assertion failed: !tcx.is_mutable_static(def_id)
stack backtrace:
   0:     0x7f791b3866c5 - std::backtrace_rs::backtrace::libunwind::trace::h0dde1465b66e0bbc
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f791b3866c5 - std::backtrace_rs::backtrace::trace_unsynchronized::hfe1fbe70eccd30a7
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f791b3866c5 - std::sys_common::backtrace::_print_fmt::h093790065b26d328
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f791b3866c5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha34c60e89bc4531b
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f791b3d774b - core::fmt::rt::Argument::fmt::hc7e61bdecc1e0748
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/core/src/fmt/rt.rs:142:9
   5:     0x7f791b3d774b - core::fmt::write::hbd62fdf3779f1b5a
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/core/src/fmt/mod.rs:1153:17
   6:     0x7f791b37b2af - std::io::Write::write_fmt::h5b34811db09ed959
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/io/mod.rs:1843:15
   7:     0x7f791b38649e - std::sys_common::backtrace::_print::h018740f65ebbf245
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f791b38649e - std::sys_common::backtrace::print::ha5e754e67506bcfd
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f791b389149 - std::panicking::default_hook::{{closure}}::h66e1a9082dba1e8f
  10:     0x7f791b388eb3 - std::panicking::default_hook::h296fda7c69396aaa
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/panicking.rs:292:9
  11:     0x7f7917bf7a4f - std[28cea44e47f92da2]::panicking::update_hook::<alloc[6d832cc9f97713f4]::boxed::Box<rustc_driver_impl[7ce072e57cf39d0d]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f791b38984c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h8e07c02829834f4a
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/alloc/src/boxed.rs:2032:9
  13:     0x7f791b38984c - std::panicking::rust_panic_with_hook::ha6b791a790e4c8b6
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/panicking.rs:793:13
  14:     0x7f791b3895bd - std::panicking::begin_panic_handler::{{closure}}::h4eba7e6fa99311de
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/panicking.rs:650:13
  15:     0x7f791b386b89 - std::sys_common::backtrace::__rust_end_short_backtrace::h705dfb32fd592b93
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f791b389327 - rust_begin_unwind
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/panicking.rs:646:5
  17:     0x7f791b3d3be6 - core::panicking::panic_fmt::h29357ebd2965afeb
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/core/src/panicking.rs:72:14
  18:     0x7f791b3d3c8f - core::panicking::panic::h365c582d07c99abc
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/core/src/panicking.rs:141:5
  19:     0x7f790ae1e59a - rustc_codegen_cranelift[f331086d87cfdf90]::constant::data_id_for_static
  20:     0x7f790ae1cef1 - rustc_codegen_cranelift[f331086d87cfdf90]::constant::codegen_const_value
  21:     0x7f790ae1580b - rustc_codegen_cranelift[f331086d87cfdf90]::base::codegen_operand
  22:     0x7f790ae0bb45 - rustc_codegen_cranelift[f331086d87cfdf90]::base::codegen_fn_body
  23:     0x7f790ae28b6d - rustc_codegen_cranelift[f331086d87cfdf90]::driver::aot::module_codegen::{closure#0}
  24:     0x7f790ae24f17 - rustc_codegen_cranelift[f331086d87cfdf90]::driver::aot::module_codegen
  25:     0x7f790ae32209 - rustc_codegen_cranelift[f331086d87cfdf90]::driver::aot::run_aot
  26:     0x7f790ae60e91 - <rustc_codegen_cranelift[f331086d87cfdf90]::CraneliftCodegenBackend as rustc_codegen_ssa[7109f377bf2e1a93]::traits::backend::CodegenBackend>::codegen_crate
  27:     0x7f7919efa145 - rustc_interface[d75395f7b223fbcb]::passes::start_codegen
  28:     0x7f7919ef97b4 - <rustc_interface[d75395f7b223fbcb]::queries::Queries>::codegen_and_build_linker
  29:     0x7f7919c9a7c4 - rustc_interface[d75395f7b223fbcb]::interface::run_compiler::<core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>, rustc_driver_impl[7ce072e57cf39d0d]::run_compiler::{closure#0}>::{closure#0}
  30:     0x7f7919d6627f - std[28cea44e47f92da2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[d75395f7b223fbcb]::util::run_in_thread_with_globals<rustc_interface[d75395f7b223fbcb]::util::run_in_thread_pool_with_globals<rustc_interface[d75395f7b223fbcb]::interface::run_compiler<core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>, rustc_driver_impl[7ce072e57cf39d0d]::run_compiler::{closure#0}>::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>
  31:     0x7f7919d66072 - <<std[28cea44e47f92da2]::thread::Builder>::spawn_unchecked_<rustc_interface[d75395f7b223fbcb]::util::run_in_thread_with_globals<rustc_interface[d75395f7b223fbcb]::util::run_in_thread_pool_with_globals<rustc_interface[d75395f7b223fbcb]::interface::run_compiler<core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>, rustc_driver_impl[7ce072e57cf39d0d]::run_compiler::{closure#0}>::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bfe4fde843a20040]::result::Result<(), rustc_span[22d215cff5c0359c]::ErrorGuaranteed>>::{closure#1} as core[bfe4fde843a20040]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  32:     0x7f791b3931a9 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h391ddcf1e8250910
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/alloc/src/boxed.rs:2018:9
  33:     0x7f791b3931a9 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha0b3833bb294e634
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/alloc/src/boxed.rs:2018:9
  34:     0x7f791b3931a9 - std::sys::pal::unix::thread::Thread::new::thread_start::hba2d16457fd4959d
                               at /rustc/18527282244431f597720e4fd42199e7333cc1c1/library/std/src/sys/pal/unix/thread.rs:108:17
  35:     0x7f791b13155a - <unknown>
  36:     0x7f791b1aea3c - <unknown>
  37:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.79.0-nightly (185272822 2024-03-30) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z codegen-backend=cranelift -Z dump-mir-dir=dir

query stack during panic:
end of query stack

[bjorn3]

Looks like cg_llvm ignores the mut entirely.

[bjorn3]

https://github.com/rust-lang/rust/pull/125046 will make rustc error out on this.