ICE: `Architecture x86_64 does not support GpuKernel calling convention`

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(abi_ptx)]
fn main() {
    let non_secure_function = unsafe {
        core::mem::transmute::<usize, extern "ptx-kernel" fn(i32, i32, i32, i32) -> i32>(0x10000004)
    };
    let mut toto = 5;
    toto += non_secure_function(toto, 2, 3, 5);
}

original:

// gate-test-abi_c_cmse_nonsecure_call
#[allow(unsupported_fn_ptr_calling_conventions)]
fn main() {
    let non_secure_function = unsafe {
        core::mem::transmute::<usize, extern "ptx-kernel" fn(i32, i32, i32, i32) -> i32>(
            //~^ ERROR [E0658]
            0x10000004,
        )
    };
    let mut toto = 5;
    toto += non_secure_function(toto, 2, 3, 5);
}

Version information

rustc 1.87.0-nightly (70237a8cb 2025-03-20)
binary: rustc
commit-hash: 70237a8cb905fc48ed6148d2f2dba756535a5940
commit-date: 2025-03-20
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Possibly related line of code:

rust/compiler/rustc_codegen_llvm/src/abi.rs

Lines 674 to 686 in 70237a8

	Conv::GpuKernel => {
	if arch == "amdgpu" {
	llvm::AmdgpuKernel
	} else if arch == "nvptx64" {
	llvm::PtxKernel
	} else {
	panic!("Architecture {arch} does not support GpuKernel calling convention");
	}
	}
	Conv::AvrInterrupt => llvm::AvrInterrupt,
	Conv::AvrNonBlockingInterrupt => llvm::AvrNonBlockingInterrupt,
	Conv::ArmAapcs => llvm::ArmAapcsCallConv,
	Conv::Msp430Intr => llvm::Msp430Intr,

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(abi_ptx)

Program output

warning: the calling convention "ptx-kernel" is not supported on this target
 --> /tmp/icemaker_global_tempdir.5RiKb1aS18Mo/rustc_testrunner_tmpdir_reporting.vC9uw8ssapd6/mvce.rs:3:39
  |
3 |         core::mem::transmute::<usize, extern "ptx-kernel" fn(i32, i32, i32, i32) -> i32>(0x10000004)
  |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
  = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default

warning: value assigned to `toto` is never read
 --> /tmp/icemaker_global_tempdir.5RiKb1aS18Mo/rustc_testrunner_tmpdir_reporting.vC9uw8ssapd6/mvce.rs:6:5
  |
6 |     toto += non_secure_function(toto, 2, 3, 5);
  |     ^^^^
  |
  = help: maybe it is overwritten before being read?
  = note: `#[warn(unused_assignments)]` on by default


thread 'rustc' panicked at compiler/rustc_codegen_llvm/src/abi.rs:680:21:
Architecture x86_64 does not support GpuKernel calling convention
stack backtrace:
   0:     0x79ada6830003 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h879fffc75fdea4ca
   1:     0x79ada7005a58 - core::fmt::write::h4872d0510b46ecc6
   2:     0x79ada83c5751 - std::io::Write::write_fmt::hbd981463303fde9c
   3:     0x79ada682fe62 - std::sys::backtrace::BacktraceLock::print::hcf9aac352b7eac82
   4:     0x79ada683271a - std::panicking::default_hook::{{closure}}::hedab5cca755b9743
   5:     0x79ada683229f - std::panicking::default_hook::h1fcdc03d8389a618
   6:     0x79ada589bf20 - std[c9702a20cd481928]::panicking::update_hook::<alloc[49ba14cf04ef8a65]::boxed::Box<rustc_driver_impl[8a35e1c27f9e238f]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x79ada6832f93 - std::panicking::rust_panic_with_hook::ha0e51fe2d11054e2
   8:     0x79ada6832c8a - std::panicking::begin_panic_handler::{{closure}}::hc5cbb737c532592b
   9:     0x79ada68304d9 - std::sys::backtrace::__rust_end_short_backtrace::hf92f52b58bf43613
  10:     0x79ada683294d - __rustc[bd409a3545e2ef9f]::rust_begin_unwind
  11:     0x79ada326b750 - core::panicking::panic_fmt::hfabf34321fa7b35b
  12:     0x79ada72be178 - <rustc_target[4ee8a907d88b8e02]::callconv::FnAbi<rustc_middle[d57d21cb3f97984b]::ty::Ty> as rustc_codegen_llvm[3ffc3f5f98c79521]::abi::FnAbiLlvmExt>::apply_attrs_callsite
  13:     0x79ada72bbcbf - <rustc_codegen_llvm[3ffc3f5f98c79521]::builder::GenericBuilder<rustc_codegen_llvm[3ffc3f5f98c79521]::context::FullCx> as rustc_codegen_ssa[91b4b525e278393]::traits::builder::BuilderMethods>::call
  14:     0x79ada72b521c - <rustc_codegen_ssa[91b4b525e278393]::mir::block::TerminatorCodegenHelper>::do_call::<rustc_codegen_llvm[3ffc3f5f98c79521]::builder::GenericBuilder<rustc_codegen_llvm[3ffc3f5f98c79521]::context::FullCx>>
  15:     0x79ada3f29b53 - <rustc_codegen_ssa[91b4b525e278393]::mir::FunctionCx<rustc_codegen_llvm[3ffc3f5f98c79521]::builder::GenericBuilder<rustc_codegen_llvm[3ffc3f5f98c79521]::context::FullCx>>>::codegen_terminator
  16:     0x79ada80b87a9 - rustc_codegen_ssa[91b4b525e278393]::mir::codegen_mir::<rustc_codegen_llvm[3ffc3f5f98c79521]::builder::GenericBuilder<rustc_codegen_llvm[3ffc3f5f98c79521]::context::FullCx>>
  17:     0x79ada809c351 - rustc_codegen_llvm[3ffc3f5f98c79521]::base::compile_codegen_unit::module_codegen
  18:     0x79ada8165995 - <rustc_codegen_llvm[3ffc3f5f98c79521]::LlvmCodegenBackend as rustc_codegen_ssa[91b4b525e278393]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  19:     0x79ada81622d7 - <rustc_codegen_llvm[3ffc3f5f98c79521]::LlvmCodegenBackend as rustc_codegen_ssa[91b4b525e278393]::traits::backend::CodegenBackend>::codegen_crate
  20:     0x79ada8191405 - <rustc_interface[1dd91e2665f7489c]::queries::Linker>::codegen_and_build_linker
  21:     0x79ada818ecb0 - rustc_interface[1dd91e2665f7489c]::passes::create_and_enter_global_ctxt::<core[fb772cbc65c9782a]::option::Option<rustc_interface[1dd91e2665f7489c]::queries::Linker>, rustc_driver_impl[8a35e1c27f9e238f]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  22:     0x79ada813fcaf - rustc_interface[1dd91e2665f7489c]::interface::run_compiler::<(), rustc_driver_impl[8a35e1c27f9e238f]::run_compiler::{closure#0}>::{closure#1}
  23:     0x79ada7fbbfc8 - std[c9702a20cd481928]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[1dd91e2665f7489c]::util::run_in_thread_with_globals<rustc_interface[1dd91e2665f7489c]::util::run_in_thread_pool_with_globals<rustc_interface[1dd91e2665f7489c]::interface::run_compiler<(), rustc_driver_impl[8a35e1c27f9e238f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  24:     0x79ada7fbc8b4 - <<std[c9702a20cd481928]::thread::Builder>::spawn_unchecked_<rustc_interface[1dd91e2665f7489c]::util::run_in_thread_with_globals<rustc_interface[1dd91e2665f7489c]::util::run_in_thread_pool_with_globals<rustc_interface[1dd91e2665f7489c]::interface::run_compiler<(), rustc_driver_impl[8a35e1c27f9e238f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[fb772cbc65c9782a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  25:     0x79ada7fbdcb7 - std::sys::pal::unix::thread::Thread::new::thread_start::h2500dd9e4f747739
  26:     0x79ada1ea370a - <unknown>
  27:     0x79ada1f27aac - <unknown>
  28:                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: please make sure that you have updated to the latest nightly

note: rustc 1.87.0-nightly (70237a8cb 2025-03-20) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z crate-attr=feature(abi_ptx) -Z dump-mir-dir=dir

query stack during panic:
end of query stack
warning: 2 warnings emitted

@rustbot label +F-abi_ptx

[matthiaskrgr]

bisects to is #136807

[Noratrieb]

@workingjubilee looks like you forgot a check

[matthiaskrgr]

smaller

#![feature(abi_ptx)]
fn main() {
    let a = unsafe { core::mem::transmute::<usize, extern "ptx-kernel" fn(i32)>(4) }(2);
}