error: rustc interrupted by SIGBUS (stable/nightly)

[tarcieri]

While invoking rustc via cargo test:

error: rustc interrupted by SIGBUS, printing backtrace

[...]

note: maximum backtrace depth reached, frames may have been lost
note: we would appreciate a report at https://github.com/rust-lang/rust
note: backtrace dumped due to SIGBUS! resuming signal

Meta

rustc --version --verbose:

rustc 1.92.0-nightly (4645a7988 2025-09-17)
binary: rustc
commit-hash: 4645a7988177c286f61609cc667ecae4c571a2e8
commit-date: 2025-09-17
host: aarch64-apple-darwin
release: 1.92.0-nightly
LLVM version: 21.1.1

Backtrace

0   librustc_driver-6bef486ded886959.dy 0x00000001108992e8 _RNvNtCsg5V23xBWzPv_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x000000018d22d6a4 _sigtramp + 56
2   rustc                               0x00000001043b06ac zone_size + 96
3   libsystem_malloc.dylib              0x000000018d025910 find_zone_and_free + 188
4   librustc_driver-6bef486ded886959.dy 0x0000000114511cd4 _ZN4llvm9DwarfFile8addRangeERKNS_16DwarfCompileUnitENS_11SmallVectorINS_9RangeSpanELj2EEE + 352
5   librustc_driver-6bef486ded886959.dy 0x00000001144e2cb4 _ZN4llvm16DwarfCompileUnit17addScopeRangeListERNS_3DIEENS_11SmallVectorINS_9RangeSpanELj2EEE + 164
6   librustc_driver-6bef486ded886959.dy 0x00000001144e1168 _ZN4llvm16DwarfCompileUnit23attachRangesOrLowHighPCERNS_3DIEENS_11SmallVectorINS_9RangeSpanELj2EEE + 208
7   librustc_driver-6bef486ded886959.dy 0x00000001144e313c _ZN4llvm16DwarfCompileUnit23attachRangesOrLowHighPCERNS_3DIEERKNS_15SmallVectorImplINSt3__14pairIPKNS_12MachineInstrES8_EEEE + 956
8   librustc_driver-6bef486ded886959.dy 0x00000001144e2b94 _ZN4llvm16DwarfCompileUnit24constructLexicalScopeDIEEPNS_12LexicalScopeE + 712
9   librustc_driver-6bef486ded886959.dy 0x00000001144e14a0 _ZN4llvm16DwarfCompileUnit17constructScopeDIEEPNS_12LexicalScopeERNS_3DIEE + 148

### cycle encountered after 10 frames with period 11
0   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
1   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
2   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
3   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
4   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
5   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
6   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
7   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
8   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
9   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
10  librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
### recursed 22 times

0   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
1   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
2   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712
3   librustc_driver-6bef486ded886959.dy 0x00000001144e26a4 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3712

[tarcieri]

Curiously this seems to also be occurring on stable?

I can try to post the code in question somewhere and see if it's reproducible from that.

rustc --version --verbose:

rustc 1.90.0 (1159e78c4 2025-09-14)
binary: rustc
commit-hash: 1159e78c4747b02ef996e55082b704c09b970588
commit-date: 2025-09-14
host: aarch64-apple-darwin
release: 1.90.0
LLVM version: 20.1.8

Backtrace

0   librustc_driver-53a3dd5be7cd01bd.dy 0x000000010eb6f3a8 _RNvNtCslOC5l1sfyEW_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x000000018d22d6a4 _sigtramp + 56
2   librustc_driver-53a3dd5be7cd01bd.dy 0x000000011367e650 _ZN4llvm15SmallVectorBaseIjE8grow_podEPvmm + 224
3   librustc_driver-53a3dd5be7cd01bd.dy 0x000000011267f32c _ZN4llvm9DwarfFile8addRangeERKNS_16DwarfCompileUnitENS_11SmallVectorINS_9RangeSpanELj2EEE + 196
4   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651bb8 _ZN4llvm16DwarfCompileUnit17addScopeRangeListERNS_3DIEENS_11SmallVectorINS_9RangeSpanELj2EEE + 164
5   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112650118 _ZN4llvm16DwarfCompileUnit23attachRangesOrLowHighPCERNS_3DIEENS_11SmallVectorINS_9RangeSpanELj2EEE + 220
6   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112652058 _ZN4llvm16DwarfCompileUnit23attachRangesOrLowHighPCERNS_3DIEERKNS_15SmallVectorImplINSt3__14pairIPKNS_12MachineInstrES8_EEEE + 980
7   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651acc _ZN4llvm16DwarfCompileUnit24constructLexicalScopeDIEEPNS_12LexicalScopeE + 540
8   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112650450 _ZN4llvm16DwarfCompileUnit17constructScopeDIEEPNS_12LexicalScopeERNS_3DIEE + 148

### cycle encountered after 9 frames with period 10
0   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
1   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
2   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
3   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
4   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
5   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
6   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
7   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
8   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
9   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
### recursed 24 times

0   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
1   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
2   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
3   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
4   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
5   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412
6   librustc_driver-53a3dd5be7cd01bd.dy 0x0000000112651528 _ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE + 3412

[tarcieri]

I pushed up the code which is triggering this for me: https://github.com/tarcieri/rustc-sigbus-147078

[Noratrieb]

I can reproduce a crash on Linux. I get a stack overflow during debuginfo generation in LLVM.

error: rustc interrupted by SIGSEGV, printing backtrace

/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/librustc_driver-37c25f9240306b8c.so(+0x3bfd01f) [0x7ffff39fd01f]
/nix/store/776irwlgfb65a782cxmyk61pck460fs9-glibc-2.40-66/lib/libc.so.6(+0x419c0) [0x7fffefa419c0]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustc(+0x147db) [0x5555555687db]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm15SmallVectorBaseIjE8grow_podEPvmm+0x5c) [0x7fffed8011dc]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm9DwarfFile8addRangeERKNS_16DwarfCompileUnitENS_11SmallVectorINS_9RangeSpanELj2EEE+0x9b) [0x7fffedaafd9b]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit17addScopeRangeListERNS_3DIEENS_11SmallVectorINS_9RangeSpanELj2EEE+0xe0) [0x7fffed994fa0]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit23attachRangesOrLowHighPCERNS_3DIEERKNS_15SmallVectorImplISt4pairIPKNS_12MachineInstrES7_EEE+0x410) [0x7fffed994e26]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit24constructLexicalScopeDIEEPNS_12LexicalScopeE+0x1fe) [0x7fffed993fbe]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x6c8) [0x7fffed9934c8]

### cycle encountered after 9 frames with period 10
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
### recursed 24 times

/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]
/home/nora/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/libLLVM.so.21.1-rust-1.92.0-nightly(_ZN4llvm16DwarfCompileUnit25createAndAddScopeChildrenEPNS_12LexicalScopeERNS_3DIEE+0x5e8) [0x7fffed9933e8]

note: rustc unexpectedly overflowed its stack! this is a bug
note: maximum backtrace depth reached, frames may have been lost
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=16777216
note: backtrace dumped due to SIGSEGV! resuming signal
warning: `p521wat` (lib test) generated 1 warning (run `cargo fix --lib -p p521wat --tests` to apply 1 suggestion)
error: could not compile `p521wat` (lib test); 1 warning emitted

[Noratrieb]

Using -Cdebuginfo=0 succeeds compilation.

[saethlin]

Increasing the stack size (following the automatic suggestion) also makes compilation succeed.

[tarcieri]

@saethlin huh, I see that now re: RUST_MIN_STACK on the error message from stable, but curiously nightly-2025-09-17 (which I originally opened the issue about) prints no such message

My bad, neither stable nor nightly display that suggestion to me, possibly because I'm on macOS and not Linux?

I can confirm it does fix the issue, though.