Crash when compiling to m68k

[wolverian]

Code

fn main() {
    println!("Hello, world!");
}

.cargo/config.toml:

[unstable]
build-std = ["panic_abort", "core", "alloc"]

[target.m68k-unknown-none-elf]
linker = "mk68k-linux-gnu-ld"

Meta

rustc --version --verbose:

rustc 1.90.0-nightly (28f1c8079 2025-06-24)
binary: rustc
commit-hash: 28f1c807911c63f08d98e7b468cfcf15a441e34b
commit-date: 2025-06-24
host: aarch64-apple-darwin
release: 1.90.0-nightly
LLVM version: 20.1.7

Error output

   Compiling compiler_builtins v0.1.160 (/Users/ii/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins)
   Compiling alloc v0.0.0 (/Users/ii/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc)             
   Compiling panic_abort v0.0.0 (/Users/ii/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/panic_abort)
error: rustc interrupted by SIGSEGV, printing backtrace, compiler_builtins                                                           

Backtrace

0   librustc_driver-eab36023e7f4b8b8.dy 0x000000010eb682b4 _RNvNtCs1cySLwkPXaU_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000195f0a704 _sigtramp + 56
2   librustc_driver-eab36023e7f4b8b8.dy 0x0000000112476a68 _ZN12_GLOBAL__N_117ScheduleDAGRRList20ListScheduleBottomUpEv + 892
3   librustc_driver-eab36023e7f4b8b8.dy 0x00000001124766c0 _ZN12_GLOBAL__N_117ScheduleDAGRRList8ScheduleEv + 432
4   librustc_driver-eab36023e7f4b8b8.dy 0x000000011251922c _ZN4llvm16SelectionDAGISel17CodeGenAndEmitDAGEv + 1004
5   librustc_driver-eab36023e7f4b8b8.dy 0x000000011251898c _ZN4llvm16SelectionDAGISel20SelectAllBasicBlocksERKNS_8FunctionE + 5208
6   librustc_driver-eab36023e7f4b8b8.dy 0x0000000112516ac8 _ZN4llvm16SelectionDAGISel20runOnMachineFunctionERNS_15MachineFunctionE + 348
7   librustc_driver-eab36023e7f4b8b8.dy 0x000000011251543c _ZN4llvm22SelectionDAGISelLegacy20runOnMachineFunctionERNS_15MachineFunctionE + 196
8   librustc_driver-eab36023e7f4b8b8.dy 0x00000001127a3b8c _ZN4llvm19MachineFunctionPass13runOnFunctionERNS_8FunctionE + 576
9   librustc_driver-eab36023e7f4b8b8.dy 0x000000011342cc54 _ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE + 668
10  librustc_driver-eab36023e7f4b8b8.dy 0x0000000113433440 _ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE + 60
11  librustc_driver-eab36023e7f4b8b8.dy 0x000000011342d72c _ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE + 2172
12  librustc_driver-eab36023e7f4b8b8.dy 0x000000011363506c LLVMRustWriteOutputFile + 528
13  librustc_driver-eab36023e7f4b8b8.dy 0x000000010e80e148 _RNvNtNtCsffrBIA8rTYU_18rustc_codegen_llvm4back5write17write_output_file + 268
14  librustc_driver-eab36023e7f4b8b8.dy 0x000000010e812834 _RNvNtNtCsffrBIA8rTYU_18rustc_codegen_llvm4back5write7codegen + 3876
15  librustc_driver-eab36023e7f4b8b8.dy 0x000000010e780054 _RINvNtNtCs2qeCQt4OaxU_17rustc_codegen_ssa4back5write24finish_intra_module_workNtCsffrBIA8rTYU_18rustc_codegen_llvm18LlvmCodegenBackendEB1g_ + 176
16  librustc_driver-eab36023e7f4b8b8.dy 0x000000010e782a14 _RINvNtNtCslwrKrpsKa3o_3std3sys9backtrace28___rust_begin_short_backtraceNCINvXs0_CsffrBIA8rTYU_18rustc_codegen_llvmNtB1g_18LlvmCodegenBackendNtNtNtCs2qeCQt4OaxU_17rustc_codegen_ssa6traits7backend19ExtraBackendMethods18spawn_named_threadNCINvNtNtB2k_4back5write10spawn_workB1O_E0uE0uEB1g_ + 2732
17  librustc_driver-eab36023e7f4b8b8.dy 0x000000010e7b16fc _RNSNvYNCINvMNtCslwrKrpsKa3o_3std6threadNtBa_7Builder16spawn_unchecked_NCINvXs0_CsffrBIA8rTYU_18rustc_codegen_llvmNtB1f_18LlvmCodegenBackendNtNtNtCs2qeCQt4OaxU_17rustc_codegen_ssa6traits7backend19ExtraBackendMethods18spawn_named_threadNCINvNtNtB2j_4back5write10spawn_workB1N_E0uE0uEs_0INtNtNtCscZc0lgoFQZ9_4core3ops8function6FnOnceuE9call_once6vtableB1f_ + 452
18  librustc_driver-eab36023e7f4b8b8.dy 0x0000000110a10e28 _ZN3std3sys3pal4unix6thread6Thread3new12thread_start17h9ff86f7b4d9410c7E + 48
19  libsystem_pthread.dylib             0x0000000195f00c0c _pthread_start + 136
20  libsystem_pthread.dylib             0x0000000195efbb80 thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432
note: backtrace dumped due to SIGSEGV! resuming signal
error: could not compile `compiler_builtins` (lib)

Caused by:
  process didn't exit successfully: `/Users/ii/.rustup/toolchains/nightly-aarch64-apple-darwin/bin/rustc --crate-name compiler_builtins --edition=2024 /Users/ii/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=135 --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="compiler-builtins"' --cfg 'feature="default"' --cfg 'feature="rustc-dep-of-std"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("c", "compiler-builtins", "default", "mangled-names", "mem", "no-asm", "no-f16-f128", "rustc-dep-of-std", "unstable-public-internals"))' -C metadata=5a86f81fbd676cfb -C extra-filename=-51518d7394b077bd --out-dir /Users/ii/code/m68/target/m68k-unknown-none-elf/debug/deps --target m68k-unknown-none-elf -C linker=mk68k-linux-gnu-ld -Z force-unstable-if-unmarked -L dependency=/Users/ii/code/m68/target/m68k-unknown-none-elf/debug/deps -L dependency=/Users/ii/code/m68/target/debug/deps --extern core=/Users/ii/code/m68/target/m68k-unknown-none-elf/debug/deps/libcore-4507d077825b9693.rmeta --cap-lints allow --cfg f16_enabled --cfg f128_enabled --cfg intrinsics_enabled --cfg arch_enabled --cfg 'feature="unstable-intrinsics"' --cfg 'feature="mem"' --check-cfg 'cfg(__ashldi3, values("optimized-c"))' --check-cfg 'cfg(__ashlsi3, values("optimized-c"))' --check-cfg 'cfg(__ashrdi3, values("optimized-c"))' --check-cfg 'cfg(__ashrsi3, values("optimized-c"))' --check-cfg 'cfg(__bswapsi2, values("optimized-c"))' --check-cfg 'cfg(__bswapdi2, values("optimized-c"))' --check-cfg 'cfg(__bswapti2, values("optimized-c"))' --check-cfg 'cfg(__divdi3, values("optimized-c"))' --check-cfg 'cfg(__divsi3, values("optimized-c"))' --check-cfg 'cfg(__divmoddi4, values("optimized-c"))' --check-cfg 'cfg(__divmodsi4, values("optimized-c"))' --check-cfg 'cfg(__divmodsi4, values("optimized-c"))' --check-cfg 'cfg(__divmodti4, values("optimized-c"))' --check-cfg 'cfg(__lshrdi3, values("optimized-c"))' --check-cfg 'cfg(__lshrsi3, values("optimized-c"))' --check-cfg 'cfg(__moddi3, values("optimized-c"))' --check-cfg 'cfg(__modsi3, values("optimized-c"))' --check-cfg 'cfg(__muldi3, values("optimized-c"))' --check-cfg 'cfg(__udivdi3, values("optimized-c"))' --check-cfg 'cfg(__udivmoddi4, values("optimized-c"))' --check-cfg 'cfg(__udivmodsi4, values("optimized-c"))' --check-cfg 'cfg(__udivsi3, values("optimized-c"))' --check-cfg 'cfg(__umoddi3, values("optimized-c"))' --check-cfg 'cfg(__umodsi3, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas16_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas16_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas16_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_cas16_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldadd8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldclr8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldeor8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_ldset8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp1_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp1_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp1_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp1_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp2_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp2_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp2_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp2_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp4_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp4_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp4_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp4_acq_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp8_relax, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp8_acq, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp8_rel, values("optimized-c"))' --check-cfg 'cfg(__aarch64_swp8_acq_rel, values("optimized-c"))' --check-cfg 'cfg(target_feature, values("vis3"))' --check-cfg 'cfg(feature, values("checked"))' --check-cfg 'cfg(assert_no_panic)' --check-cfg 'cfg(f16_enabled)' --check-cfg 'cfg(f128_enabled)' --check-cfg 'cfg(thumb)' --check-cfg 'cfg(thumb_1)' --check-cfg 'cfg(intrinsics_enabled)' --check-cfg 'cfg(arch_enabled)' --check-cfg 'cfg(optimizations_enabled)' --check-cfg 'cfg(feature, values("unstable-public-internals"))' --check-cfg 'cfg(optimizations_enabled)' --check-cfg 'cfg(x86_no_sse)' --check-cfg 'cfg(kernel_user_helpers)' --check-cfg 'cfg(feature, values("mem-unaligned"))'` (signal: 11, SIGSEGV: invalid memory reference)

[wolverian]

Happens when targeting m68k-unknown-linux-gnu too.

[workingjubilee]

Ooh, death in SelectionDAG. That's a new one.

cc @knickish @glaubitz @ricky26

[knickish]

MacOS, ok. Will try and take a look this weekend.

[folkertdev]

Hmm, this seems to have been broken for a while. Testing with some nightlies that I happen to have laying around:

nightly-2024-11-28-x86_64-unknown-linux-gnu

rustc-LLVM ERROR: Cannot select: 0x7bd8fc813700: i32,ch = AtomicLoad<(load unordered (s32) from %ir.31)> 0x7bd8fc95e0e8, 0x7bd8fc813ee0, src/mem/mod.rs:71:49
  0x7bd8fc813ee0: i32 = add 0x7bd8fc82a2a0, 0x7bd8fc82a000, /home/folkertdev/.rustup/toolchains/nightly-2024-11-28-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:951:18 @[ src/mem/mod.rs:71:71 ]
    0x7bd8fc82a2a0: i32,ch = CopyFromReg 0x7bd8fc95e0e8, Register:i32 %6, /home/folkertdev/.rustup/toolchains/nightly-2024-11-28-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:951:18 @[ src/mem/mod.rs:71:71 ]
      0x7bd8fc8137e0: i32 = Register %6
    0x7bd8fc82a000: i32 = shl 0x7bd8fc82aaf0, Constant:i32<2>, /home/folkertdev/.rustup/toolchains/nightly-2024-11-28-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:951:18 @[ src/mem/mod.rs:71:71 ]
      0x7bd8fc82aaf0: i32,ch = CopyFromReg 0x7bd8fc95e0e8, Register:i32 %3, /home/folkertdev/.rustup/toolchains/nightly-2024-11-28-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:951:18 @[ src/mem/mod.rs:71:71 ]
        0x7bd8fc813f50: i32 = Register %3
      0x7bd8fc813e70: i32 = Constant<2>
In function: _ZN17compiler_builtins3mem31memcpy_element_unordered_atomic17h50a885604a3c1fbaE

So maybe that is a hint? Some time later it switches to the backtrace of the issue, so that is probably the LLVM update.

[wolverian]

I get this on host Linux (Debian Trixie) as well, FWIW.