backtrace missing when rustc panics #106267
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can you share your example code, as it doesn't seem that all ICEs are missing backtraces: here's an ICE on the same nightly and beta, and which has a backtrace on both. (if you have the time to do so and a master checkout, it'd be interesting to know whether ThinLTO could be involved like in #105637; bisection would also be worthwhile) |
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Hmm interesting, maybe its' something that only happens with #92495 does not show a backtrace for me #![feature(lang_items, no_core, start)]
#![no_std]
#![no_core]
#[lang = "sized"]
pub trait Sized {}
#[lang = "copy"]
trait Copy {}
#[start]
fn main(argc: isize, _argv: *const *const u8) -> isize {
match argc {
1 => 1,
_ => 0,
}
}
I also can't force it with |
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This backtrace was removed on purpose in #106056 because it's useless. It just points at the place in the error machinery where delayed bugs get flushed, which is either just noise or misleading at worse. |
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Jan 11, 2023
…ace, r=Nilstrieb Collect and emit proper backtraces for `delay_span_bug`s This is a follow-up to rust-lang#106317, which addresses this comment (rust-lang#106267 (comment)) which notes that `delay_span_bug`s' backtraces are nonsense. Captures and emits the backtrace of the delayed span bug when it's *created*, rather than using the backtrace of the place where delayed bugs are flushed. --- To test, I delayed a span bug during HIR typeck, specifically in `typeck_with_fallback`... Before, note `flush_delayed` on frame 18. This is at the end of the compilation session, far from where the bug is being delayed. ``` error: internal compiler error: test --> /home/ubuntu/test.rs:1:1 | 1 | fn main() {} | ^^^^^^^^^ | = note: delayed at compiler/rustc_hir_typeck/src/lib.rs:196:14 thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1634:13 stack backtrace: 0: 0x7f9c3ec69dd1 - std::backtrace_rs::backtrace::libunwind::trace::h26056f81198c6594 at /home/ubuntu/rust2/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5 1: 0x7f9c3ec69dd1 - std::backtrace_rs::backtrace::trace_unsynchronized::hacfb345a0c6d5bb1 at /home/ubuntu/rust2/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f9c3ec69dd1 - std::sys_common::backtrace::_print_fmt::h18ea6016ac8030f3 at /home/ubuntu/rust2/library/std/src/sys_common/backtrace.rs:65:5 3: 0x7f9c3ec69dd1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he35dde201d0c2d09 at /home/ubuntu/rust2/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7f9c3ecee308 - core::fmt::write::h094ad263467a053c at /home/ubuntu/rust2/library/core/src/fmt/mod.rs:1208:17 5: 0x7f9c3ec8aaf1 - std::io::Write::write_fmt::hd47b4e2324b4d9b7 at /home/ubuntu/rust2/library/std/src/io/mod.rs:1682:15 6: 0x7f9c3ec69bfa - std::sys_common::backtrace::_print::h43044162653a17fc at /home/ubuntu/rust2/library/std/src/sys_common/backtrace.rs:47:5 7: 0x7f9c3ec69bfa - std::sys_common::backtrace::print::hc8605da258fa5aeb at /home/ubuntu/rust2/library/std/src/sys_common/backtrace.rs:34:9 8: 0x7f9c3ec4db87 - std::panicking::default_hook::{{closure}}::h9e37f23f75122a15 9: 0x7f9c3ec4d97b - std::panicking::default_hook::h602873a063f84da2 at /home/ubuntu/rust2/library/std/src/panicking.rs:286:9 10: 0x7f9c3f6672b2 - <alloc[48d7b30605060536]::boxed::Box<dyn for<'a, 'b> core[672e3947e150d6c6]::ops::function::Fn<(&'a core[672e3947e150d6c6]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[672e3947e150d6c6]::marker::Send + core[672e3947e150d6c6]::marker::Sync> as core[672e3947e150d6c6]::ops::function::Fn<(&core[672e3947e150d6c6]::panic::panic_info::PanicInfo,)>>::call at /home/ubuntu/rust2/library/alloc/src/boxed.rs:2002:9 11: 0x7f9c3f6672b2 - rustc_driver[f5b6d32d8905ecdd]::DEFAULT_HOOK::{closure#0}::{closure#0} at /home/ubuntu/rust2/compiler/rustc_driver/src/lib.rs:1204:17 12: 0x7f9c3ec4e0d3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hfd13333ca953ae8e at /home/ubuntu/rust2/library/alloc/src/boxed.rs:2002:9 13: 0x7f9c3ec4e0d3 - std::panicking::rust_panic_with_hook::h45753e10264ebe7e at /home/ubuntu/rust2/library/std/src/panicking.rs:692:13 14: 0x7f9c422a1aa3 - std[3330b4673efabfce]::panicking::begin_panic::<rustc_errors[1b15f4e7e49d1fd5]::ExplicitBug>::{closure#0} at /home/ubuntu/rust2/library/std/src/panicking.rs:608:9 15: 0x7f9c422a1a46 - std[3330b4673efabfce]::sys_common::backtrace::__rust_end_short_backtrace::<std[3330b4673efabfce]::panicking::begin_panic<rustc_errors[1b15f4e7e49d1fd5]::ExplicitBug>::{closure#0}, !> at /home/ubuntu/rust2/library/std/src/sys_common/backtrace.rs:137:18 16: 0x7f9c3f63a996 - std[3330b4673efabfce]::panicking::begin_panic::<rustc_errors[1b15f4e7e49d1fd5]::ExplicitBug> at /home/ubuntu/rust2/library/std/src/panicking.rs:607:12 17: 0x7f9c4227a496 - std[3330b4673efabfce]::panic::panic_any::<rustc_errors[1b15f4e7e49d1fd5]::ExplicitBug> at /home/ubuntu/rust2/library/std/src/panic.rs:61:5 18: 0x7f9c4227cdf7 - <rustc_errors[1b15f4e7e49d1fd5]::HandlerInner>::flush_delayed::<alloc[48d7b30605060536]::vec::Vec<rustc_errors[1b15f4e7e49d1fd5]::diagnostic::Diagnostic>, &str, rustc_errors[1b15f4e7e49d1fd5]::ExplicitBug> at /home/ubuntu/rust2/compiler/rustc_errors/src/lib.rs:1634:13 19: 0x7f9c422498cf - <rustc_errors[1b15f4e7e49d1fd5]::Handler>::flush_delayed at /home/ubuntu/rust2/compiler/rustc_errors/src/lib.rs:1225:9 [ FRAMES INTENTIONALLY OMITTED ] 44: 0x7f9c3f6f3584 - <std[3330b4673efabfce]::thread::Builder>::spawn_unchecked_::<rustc_interface[947706ead88047d0]::util::run_in_thread_pool_with_globals<rustc_interface[947706ead88047d0]::interface::run_compiler<core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>, rustc_driver[f5b6d32d8905ecdd]::run_compiler::{closure#1}>::{closure#0}, core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>>::{closure#1} at /home/ubuntu/rust2/library/std/src/thread/mod.rs:549:30 45: 0x7f9c3f6f3584 - <<std[3330b4673efabfce]::thread::Builder>::spawn_unchecked_<rustc_interface[947706ead88047d0]::util::run_in_thread_pool_with_globals<rustc_interface[947706ead88047d0]::interface::run_compiler<core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>, rustc_driver[f5b6d32d8905ecdd]::run_compiler::{closure#1}>::{closure#0}, core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[672e3947e150d6c6]::result::Result<(), rustc_errors[1b15f4e7e49d1fd5]::ErrorGuaranteed>>::{closure#1} as core[672e3947e150d6c6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} at /home/ubuntu/rust2/library/core/src/ops/function.rs:250:5 46: 0x7f9c3ec81968 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he8b26fc22c6f51ec at /home/ubuntu/rust2/library/alloc/src/boxed.rs:1988:9 47: 0x7f9c3ec81968 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5cf9cbe75a8c3ddc at /home/ubuntu/rust2/library/alloc/src/boxed.rs:1988:9 48: 0x7f9c3ec5f99c - std::sys::unix::thread::Thread::new::thread_start::h2d6dd4455e97d031 at /home/ubuntu/rust2/library/std/src/sys/unix/thread.rs:108:17 49: 0x7f9c37c69609 - start_thread 50: 0x7f9c3ead0133 - clone 51: 0x0 - <unknown> ``` After, note `typeck_with_fallback` on the 5th frame, that's where we *actually* need to be pointed to: ``` error: internal compiler error: no errors encountered even though `delay_span_bug` issued error: internal compiler error: test --> /home/ubuntu/test.rs:1:1 | 1 | fn main() {} | ^^^^^^^^^ | = note: delayed at 0: <rustc_errors::HandlerInner>::emit_diagnostic at ./compiler/rustc_errors/src/lib.rs:1279:29 1: <rustc_errors::HandlerInner>::delay_span_bug::<rustc_span::span_encoding::Span, &str> at ./compiler/rustc_errors/src/lib.rs:1553:9 2: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str> at ./compiler/rustc_errors/src/lib.rs:995:9 3: <rustc_session::session::Session>::delay_span_bug::<rustc_span::span_encoding::Span, &str> at ./compiler/rustc_session/src/session.rs:600:9 4: rustc_hir_typeck::typeck_with_fallback::<rustc_hir_typeck::typeck::{closure#0}>::{closure#0} at ./compiler/rustc_hir_typeck/src/lib.rs:196:5 5: rustc_hir_typeck::typeck_with_fallback::<rustc_hir_typeck::typeck::{closure#0}> at ./compiler/rustc_hir_typeck/src/lib.rs:185:36 6: rustc_hir_typeck::typeck at ./compiler/rustc_hir_typeck/src/lib.rs:166:9 [ FRAMES INTENTIONALLY OMITTED ] 108: std::panicking::try::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, core::panic::unwind_safe::AssertUnwindSafe<<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1}::{closure#0}>> at ./library/std/src/panicking.rs:447:19 109: std::panic::catch_unwind::<core::panic::unwind_safe::AssertUnwindSafe<<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1}::{closure#0}>, core::result::Result<(), rustc_errors::ErrorGuaranteed>> at ./library/std/src/panic.rs:140:14 110: <std::thread::Builder>::spawn_unchecked_::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} at ./library/std/src/thread/mod.rs:549:30 111: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} at ./library/core/src/ops/function.rs:250:5 112: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once at ./library/alloc/src/boxed.rs:1988:9 113: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once at ./library/alloc/src/boxed.rs:1988:9 114: std::sys::unix::thread::Thread::new::thread_start at ./library/std/src/sys/unix/thread.rs:108:17 115: start_thread 116: clone ```
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With beta
rustc 1.67.0-beta.5 (6b1892c28 2022-12-28)but nightly does not show backtraces:
rustc 1.68.0-nightly (270c94e48 2022-12-28)edits
this is with
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