panic Error("Unexpected value for bool: 2") on transmute shenanigans #3020
Description
I tried this code:
// Validation makes this fail in the wrong place
// Make sure we find these even with many checks disabled.
//@compile-flags: -Zmiri-disable-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-disable-validation
#[kani::proof]
fn main() {
let b = unsafe { std::mem::transmute::<u8, bool>(2) };
let _x = b == std::hint::black_box(true); //~ ERROR: interpreting an invalid 8-bit value as a bool
}using the following command line invocation:
RUSTFLAGS="-Zmir-opt-level=2" kani invalid_bool_op.rs
with Kani version: 0.46.0
I expected to see this happen: explanation
Instead, this happened: explanation
Kani Rust Verifier 0.46.0 (standalone)
thread 'rustc' panicked at kani-compiler/src/codegen_cprover_gotoc/codegen/operand.rs:149:62:
called `Result::unwrap()` on an `Err` value: Error("Unexpected value for bool: `2`")
stack backtrace:
0: 0x7f420898be86 - std::backtrace_rs::backtrace::libunwind::trace::haa62de98ce20d13c
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x7f420898be86 - std::backtrace_rs::backtrace::trace_unsynchronized::h4bc7f582e9f49dbd
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f420898be86 - std::sys_common::backtrace::_print_fmt::h07d78988ae6e922d
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7f420898be86 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he72c24e459b4aee4
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f42089de740 - core::fmt::rt::Argument::fmt::h9ff3b213e1468f5f
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/core/src/fmt/rt.rs:142:9
5: 0x7f42089de740 - core::fmt::write::h0ab1f59280077a18
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/core/src/fmt/mod.rs:1120:17
6: 0x7f420897f7bf - std::io::Write::write_fmt::h2f48f6201433d434
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/io/mod.rs:1810:15
7: 0x7f420898bc64 - std::sys_common::backtrace::_print::h710dac96d5446d07
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7f420898bc64 - std::sys_common::backtrace::print::h22982b9f2c94c190
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7f420898e9f7 - std::panicking::default_hook::{{closure}}::h19052586580466eb
10: 0x7f420898e759 - std::panicking::default_hook::h9f3f4c25f2a49543
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/panicking.rs:292:9
11: 0x55c582f8b29d - kani_compiler::session::PANIC_HOOK::{{closure}}::{{closure}}::h62bee1eb7956b9f6
12: 0x55c582f8aaa3 - kani_compiler::codegen_cprover_gotoc::utils::debug::DEFAULT_HOOK::{{closure}}::{{closure}}::h252d31e703366824
13: 0x7f420898f146 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0ebb0eb5cf5e84f1
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/alloc/src/boxed.rs:2030:9
14: 0x7f420898f146 - std::panicking::rust_panic_with_hook::hb83cfb3ac729d1b2
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/panicking.rs:785:13
15: 0x7f420898ee92 - std::panicking::begin_panic_handler::{{closure}}::hf6588d71adde3329
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/panicking.rs:659:13
16: 0x7f420898c386 - std::sys_common::backtrace::__rust_end_short_backtrace::hfa69dd6720275711
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys_common/backtrace.rs:171:18
17: 0x7f420898ebe4 - rust_begin_unwind
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/panicking.rs:647:5
18: 0x7f42089dae45 - core::panicking::panic_fmt::h3d775185360585e3
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/core/src/panicking.rs:72:14
19: 0x7f42089db543 - core::result::unwrap_failed::hd91c3f27e666973b
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/core/src/result.rs:1649:5
20: 0x55c582f021bc - kani_compiler::codegen_cprover_gotoc::codegen::operand::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::try_codegen_constant::hf98efd98acfac45a
21: 0x55c582f00d86 - kani_compiler::codegen_cprover_gotoc::codegen::operand::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_allocation::h4cdc94a8511effd6
22: 0x55c582f006aa - kani_compiler::codegen_cprover_gotoc::codegen::operand::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_operand_stable::h669d4e8bb4fb2d55
23: 0x55c582f0ec90 - kani_compiler::codegen_cprover_gotoc::codegen::rvalue::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_rvalue_binary_op::h0d54cbf426123b98
24: 0x55c582f11d88 - kani_compiler::codegen_cprover_gotoc::codegen::rvalue::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_rvalue_stable::h03604d81673e65d8
25: 0x55c582f1ed59 - kani_compiler::codegen_cprover_gotoc::codegen::statement::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_statement::h9ef1fd17419243a3
26: 0x55c582f36b18 - kani_compiler::codegen_cprover_gotoc::utils::debug::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::call_with_panic_debug_info::h70ea6b1d619c790d
27: 0x55c582ff9e9a - kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend::codegen_items::h179e069baadeebc1
28: 0x55c582fb1430 - scoped_tls::ScopedKey<T>::set::h462dbe7b3063cb5c
29: 0x55c582fe91a4 - rustc_smir::rustc_internal::init::hdab7351afa62793a
30: 0x55c582fb4054 - stable_mir::compiler_interface::run::hdc01671daf50c78a
31: 0x55c582ffd62e - <kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::hd5728f8a33105c7d
32: 0x7f420d46aff0 - rustc_interface[79a3a7c6d29fbb15]::passes::start_codegen
33: 0x7f420d46a75c - <rustc_interface[79a3a7c6d29fbb15]::queries::Queries>::codegen_and_build_linker
34: 0x7f420d77a44a - rustc_interface[79a3a7c6d29fbb15]::interface::run_compiler::<core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>, rustc_driver_impl[27708ea34d8a9a18]::run_compiler::{closure#0}>::{closure#0}
35: 0x7f420d9e5986 - std[da4468a6436061de]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[79a3a7c6d29fbb15]::util::run_in_thread_with_globals<rustc_interface[79a3a7c6d29fbb15]::util::run_in_thread_pool_with_globals<rustc_interface[79a3a7c6d29fbb15]::interface::run_compiler<core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>, rustc_driver_impl[27708ea34d8a9a18]::run_compiler::{closure#0}>::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>
36: 0x7f420d9e57b3 - <<std[da4468a6436061de]::thread::Builder>::spawn_unchecked_<rustc_interface[79a3a7c6d29fbb15]::util::run_in_thread_with_globals<rustc_interface[79a3a7c6d29fbb15]::util::run_in_thread_pool_with_globals<rustc_interface[79a3a7c6d29fbb15]::interface::run_compiler<core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>, rustc_driver_impl[27708ea34d8a9a18]::run_compiler::{closure#0}>::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2f78b8535a2e64fa]::result::Result<(), rustc_span[8cc10a3d00093188]::ErrorGuaranteed>>::{closure#1} as core[2f78b8535a2e64fa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
37: 0x7f4208998735 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hda2c57e98ef914e1
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/alloc/src/boxed.rs:2016:9
38: 0x7f4208998735 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4c1ca1ffb3984aed
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/alloc/src/boxed.rs:2016:9
39: 0x7f4208998735 - std::sys::pal::unix::thread::Thread::new::thread_start::h6dfa281031503fa8
at /rustc/7ffc697ce10f19447c0ce338428ae4b9bc0c041c/library/std/src/sys/pal/unix/thread.rs:108:17
40: 0x7f42086979eb - <unknown>
41: 0x7f420871b7cc - <unknown>
42: 0x0 - <unknown>
Kani unexpectedly panicked during compilation.
Please file an issue here: https://github.com/model-checking/kani/issues/new?labels=bug&template=bug_report.md
[Kani] current codegen item: codegen_function: main
main
[Kani] current codegen location: Loc { file: "invalid_bool_op.rs", function: None, start_line: 6, start_col: Some(1), end_line: 6, end_col: Some(10) }
error: /home/matthias/.kani/kani-0.46.0/bin/kani-compiler exited with status exit status: 101