ICE: assertion failed `2 == 1`
matthiaskrgr opened this issue · 1 comments
matthiaskrgr commented
auto-reduced (treereduce-rust):
use std::mem;
#[repr(packed(2), C)]
struct Slice([u32]);
struct PackedSized {
f: u8,
d: [u32; 4],
}
struct PackedUnsized {
f: u8,
d: Slice,
}
impl PackedSized {
fn unsize(&self) -> &PackedUnsized {
let len = 4usize;
unsafe { mem::transmute((self, len)) }
}
}
fn main() {
unsafe {
let p = PackedSized {
f: 0,
d: [1, 2, 3, 4],
};
let p = p.unsize() as *const PackedUnsized;
let d = std::ptr::addr_of!((*p).d);
}
}
original:
use std::mem;
#[repr(packed(2), C)]
struct Slice([u32]);
#[repr(packed(2), C)]
struct PackedSized {
f: u8,
d: [u32; 4],
}
#[repr(packed(2), C)]
struct PackedUnsized {
f: u8,
d: Slice,
}
impl PackedSized {
fn unsize(&self) -> &PackedUnsized {
// We can't unsize via a generic type since then we get the error
// that packed structs with unsized tail don't work if the tail
// might need dropping.
let len = 4usize;
unsafe { mem::transmute((self, len)) }
}
}
fn main() { unsafe {
let p = PackedSized { f: 0, d: [1, 2, 3, 4] };
let p = p.unsize() as *const PackedUnsized;
let d = std::ptr::addr_of!((*p).d);
assert_eq!(d.cast::<u32>().read_unaligned(), 1);
} }Version information
rustc 1.76.0-nightly (154f645d7 2023-12-05)
binary: rustc
commit-hash: 154f645d76a9752bd7ea58d7382b2e90e83557fb
commit-date: 2023-12-05
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcodegen-backend=cranelift
Program output
warning: unused variable: `d`
--> /tmp/icemaker_global_tempdir.plAF2EChgsBs/rustc_testrunner_tmpdir_reporting.OOg8Uc5cQuZO/mvce.rs:30:13
|
30 | let d = std::ptr::addr_of!((*p).d);
| ^ help: if this is intentional, prefix it with an underscore: `_d`
|
= note: `#[warn(unused_variables)]` on by default
warning: fields `f` and `d` are never read
--> /tmp/icemaker_global_tempdir.plAF2EChgsBs/rustc_testrunner_tmpdir_reporting.OOg8Uc5cQuZO/mvce.rs:7:5
|
6 | struct PackedSized {
| ----------- fields in this struct
7 | f: u8,
| ^
8 | d: [u32; 4],
| ^
|
= note: `#[warn(dead_code)]` on by default
warning: field `f` is never read
--> /tmp/icemaker_global_tempdir.plAF2EChgsBs/rustc_testrunner_tmpdir_reporting.OOg8Uc5cQuZO/mvce.rs:12:5
|
11 | struct PackedUnsized {
| ------------- field in this struct
12 | f: u8,
| ^
thread 'rustc' panicked at src/value_and_place.rs:30:17:
assertion `left == right` failed
left: 2
right: 1
stack backtrace:
0: 0x7f42a6f8b45c - std::backtrace_rs::backtrace::libunwind::trace::h35f4e5f522d43d7a
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x7f42a6f8b45c - std::backtrace_rs::backtrace::trace_unsynchronized::h0e761e8562bb70a3
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f42a6f8b45c - std::sys_common::backtrace::_print_fmt::hdbdc2dea859e18b4
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7f42a6f8b45c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbb910326e1a03d63
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f42a6fde4a0 - core::fmt::rt::Argument::fmt::h0aac43bc205189ec
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/core/src/fmt/rt.rs:142:9
5: 0x7f42a6fde4a0 - core::fmt::write::hdb4751abc76548d1
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/core/src/fmt/mod.rs:1120:17
6: 0x7f42a6f7f2bf - std::io::Write::write_fmt::h93b91714450cf81a
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/io/mod.rs:1810:15
7: 0x7f42a6f8b244 - std::sys_common::backtrace::_print::he1049711648b718e
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7f42a6f8b244 - std::sys_common::backtrace::print::h5ab8cf6e6d0c31bd
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7f42a6f8ded7 - std::panicking::default_hook::{{closure}}::hd8fcbde69a13f0dc
10: 0x7f42a6f8dc3f - std::panicking::default_hook::hb820e6e61784bba1
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/panicking.rs:292:9
11: 0x7f42a9ce8b30 - std[47c6a3bb6cb72ea7]::panicking::update_hook::<alloc[385929464eec13ac]::boxed::Box<rustc_driver_impl[30ffa5efb6d67fe0]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x7f42a6f8e618 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h71dd819b088abc58
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/alloc/src/boxed.rs:2021:9
13: 0x7f42a6f8e618 - std::panicking::rust_panic_with_hook::hf9d24d39af723241
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/panicking.rs:783:13
14: 0x7f42a6f8e36e - std::panicking::begin_panic_handler::{{closure}}::h4932ca899b437bb6
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/panicking.rs:657:13
15: 0x7f42a6f8b926 - std::sys_common::backtrace::__rust_end_short_backtrace::h40f01f81f732b950
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys_common/backtrace.rs:171:18
16: 0x7f42a6f8e0d2 - rust_begin_unwind
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/panicking.rs:645:5
17: 0x7f42a6fdab65 - core::panicking::panic_fmt::hb4253499645cb1d5
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/core/src/panicking.rs:72:14
18: 0x7f42a6fdb0fb - core::panicking::assert_failed_inner::h8b4ddfd6fd095f30
19: 0x7f429d5c134f - core[25187a352b82944f]::panicking::assert_failed::<u64, u64>
20: 0x7f429d6564b6 - rustc_codegen_cranelift[16d1a980818d4aa1]::value_and_place::codegen_field
21: 0x7f429d658aae - <rustc_codegen_cranelift[16d1a980818d4aa1]::value_and_place::CPlace>::place_field
22: 0x7f429d610bfc - rustc_codegen_cranelift[16d1a980818d4aa1]::base::codegen_place
23: 0x7f429d607a78 - rustc_codegen_cranelift[16d1a980818d4aa1]::base::codegen_fn_body
24: 0x7f429d622cba - rustc_codegen_cranelift[16d1a980818d4aa1]::driver::aot::module_codegen::{closure#0}
25: 0x7f429d61fe55 - rustc_codegen_cranelift[16d1a980818d4aa1]::driver::aot::module_codegen
26: 0x7f429d62c5fc - rustc_codegen_cranelift[16d1a980818d4aa1]::driver::aot::run_aot
27: 0x7f429d65b02a - <rustc_codegen_cranelift[16d1a980818d4aa1]::CraneliftCodegenBackend as rustc_codegen_ssa[8fb063a124de4e53]::traits::backend::CodegenBackend>::codegen_crate
28: 0x7f42aba67305 - rustc_interface[b78234ab227b56f3]::passes::start_codegen
29: 0x7f42aba66a6e - <rustc_interface[b78234ab227b56f3]::queries::Queries>::codegen_and_build_linker
30: 0x7f42abf6f239 - rustc_interface[b78234ab227b56f3]::interface::run_compiler::<core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>, rustc_driver_impl[30ffa5efb6d67fe0]::run_compiler::{closure#0}>::{closure#0}
31: 0x7f42abf625cd - std[47c6a3bb6cb72ea7]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b78234ab227b56f3]::util::run_in_thread_with_globals<rustc_interface[b78234ab227b56f3]::util::run_in_thread_pool_with_globals<rustc_interface[b78234ab227b56f3]::interface::run_compiler<core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>, rustc_driver_impl[30ffa5efb6d67fe0]::run_compiler::{closure#0}>::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>
32: 0x7f42abf623f7 - <<std[47c6a3bb6cb72ea7]::thread::Builder>::spawn_unchecked_<rustc_interface[b78234ab227b56f3]::util::run_in_thread_with_globals<rustc_interface[b78234ab227b56f3]::util::run_in_thread_pool_with_globals<rustc_interface[b78234ab227b56f3]::interface::run_compiler<core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>, rustc_driver_impl[30ffa5efb6d67fe0]::run_compiler::{closure#0}>::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[25187a352b82944f]::result::Result<(), rustc_span[e7361cfd57c2bc5c]::ErrorGuaranteed>>::{closure#1} as core[25187a352b82944f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
33: 0x7f42a6f984a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd1775f648686723a
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/alloc/src/boxed.rs:2007:9
34: 0x7f42a6f984a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he9ea89aa13395012
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/alloc/src/boxed.rs:2007:9
35: 0x7f42a6f984a5 - std::sys::unix::thread::Thread::new::thread_start::hf7adff1f19643746
at /rustc/154f645d76a9752bd7ea58d7382b2e90e83557fb/library/std/src/sys/unix/thread.rs:108:17
36: 0x7f42a6d4d9eb - <unknown>
37: 0x7f42a6dd17cc - <unknown>
38: 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 1.76.0-nightly (154f645d7 2023-12-05) 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
warning: 3 warnings emitted
bjorn3 commented
There were a couple of fixes by RalfJ around unsized types on the rust side just yesterday. cg_clif hasn't adapted the fixes yet.