ICE on rustdoc test: delay span bug / thread::spawn failed: issue-80992.rs

[matthiaskrgr]

Summary

code from rustc ./src/test/rustdoc-ui/issue-80992.rs

pub fn test() -> Result<(), ()> {
    //! ```compile_fail
    //! fn test() -> Result< {}
    //! ```
    Ok(())
}

Found via #3142

Version

rustc 1.59.0-nightly (e012a191d 2022-01-06)
binary: rustc
commit-hash: e012a191d768adeda1ee36a99ef8b92d51920154
commit-date: 2022-01-06
host: x86_64-unknown-linux-gnu
release: 1.59.0-nightly
LLVM version: 13.0.0

clippy 0.1.59 (e012a19 2022-01-06)

Error output

clippy-driver ./src/test/rustdoc-ui/issue-80992.rs --crate-type lib

Backtrace

warning: this returns a `Result<_, ()>`
--> ./src/test/rustdoc-ui/issue-80992.rs:1:1
|
1 | pub fn test() -> Result<(), ()> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(clippy::result_unit_err)]` on by default
= help: use a custom `Error` type instead
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#result_unit_err

thread '<unnamed>' panicked at 'no errors encountered even though `delay_span_bug` issued', compiler/rustc_errors/src/lib.rs:1188:13
stack backtrace:
 0:     0x7fe0510f1b4c - std::backtrace_rs::backtrace::libunwind::trace::hac89ae696ab31153
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
 1:     0x7fe0510f1b4c - std::backtrace_rs::backtrace::trace_unsynchronized::he0e34c1ffcd1fd95
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 2:     0x7fe0510f1b4c - std::sys_common::backtrace::_print_fmt::hbbcd6534ff2cdaab
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:67:5
 3:     0x7fe0510f1b4c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hca373cbf95c63dfd
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:46:22
 4:     0x7fe05115268c - core::fmt::write::hf1bd4152e956a546
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/core/src/fmt/mod.rs:1168:17
 5:     0x7fe0510e0ec3 - std::io::Write::write_fmt::h2f14a980b941fea5
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/io/mod.rs:1660:15
 6:     0x7fe0510f6012 - std::sys_common::backtrace::_print::hc99e12058f69fd7f
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:49:5
 7:     0x7fe0510f6012 - std::sys_common::backtrace::print::h28ddbd216cc47c63
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:36:9
 8:     0x7fe0510f6012 - std::panicking::default_hook::{{closure}}::h91763e160bca83d2
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:211:50
 9:     0x7fe0510f5bf5 - std::panicking::default_hook::h04e711875c06f41e
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:228:9
10:     0x55cea4d1fa01 - clippy_driver[de939f5069ad0877]::ICE_HOOK::{closure#0}::{closure#0}
11:     0x7fe0510f67c5 - std::panicking::rust_panic_with_hook::h7d6693789c82cfe4
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:610:17
12:     0x7fe0510f64c0 - std::panicking::begin_panic_handler::{{closure}}::ha2fa99da9c892fdb
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:502:13
13:     0x7fe0510f1ff4 - std::sys_common::backtrace::__rust_end_short_backtrace::h6aa583a96333c408
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:139:18
14:     0x7fe0510f61f9 - rust_begin_unwind
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:498:5
15:     0x7fe0510bdec1 - core::panicking::panic_fmt::h5b13621b08c43b42
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/core/src/panicking.rs:107:14
16:     0x7fe052a1fa1c - core[24291291a921b533]::panicking::panic_display::<&str>
17:     0x7fe05409468d - <rustc_errors[62a5cc7b06393f71]::HandlerInner>::flush_delayed
18:     0x7fe054092b6d - <rustc_errors[62a5cc7b06393f71]::HandlerInner as core[24291291a921b533]::ops::drop::Drop>::drop
19:     0x55cea4e5c516 - core[24291291a921b533]::ptr::drop_in_place::<rustc_session[c20293ac279aad06]::parse::ParseSess>
20:     0x55cea4e608ab - <scoped_tls[ec1705c99dfa8720]::ScopedKey<rustc_span[5840c952fc6dfb1f]::SessionGlobals>>::set::<clippy_lints[3e536fcc5bfc7607]::doc::check_code::has_needless_main::{closure#0}::{closure#0}, bool>
21:     0x55cea4d371d8 - <core[24291291a921b533]::panic::unwind_safe::AssertUnwindSafe<clippy_lints[3e536fcc5bfc7607]::doc::check_code::has_needless_main::{closure#0}> as core[24291291a921b533]::ops::function::FnOnce<()>>::call_once
22:     0x55cea4d26af6 - rustc_driver[aab467f4c82ed6ad]::catch_fatal_errors::<clippy_lints[3e536fcc5bfc7607]::doc::check_code::has_needless_main::{closure#0}, bool>
23:     0x55cea4d376f0 - std[e740e8867e95a171]::sys_common::backtrace::__rust_begin_short_backtrace::<clippy_lints[3e536fcc5bfc7607]::doc::check_code::{closure#0}, bool>
24:     0x55cea4f4d68b - <<std[e740e8867e95a171]::thread::Builder>::spawn_unchecked<clippy_lints[3e536fcc5bfc7607]::doc::check_code::{closure#0}, bool>::{closure#1} as core[24291291a921b533]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
25:     0x7fe051101cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9a9713b5d2e24fc2
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/alloc/src/boxed.rs:1854:9
26:     0x7fe051101cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9651309876a3c2bf
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/alloc/src/boxed.rs:1854:9
27:     0x7fe051101cf3 - std::sys::unix::thread::Thread::new::thread_start::h8f346e0de1984669
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys/unix/thread.rs:108:17
28:     0x7fe050ff4259 - start_thread
29:     0x7fe050dd75e3 - __GI___clone
30:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.1.59 (e012a19 2022-01-06)

query stack during panic:
end of query stack
thread 'rustc' panicked at 'thread::spawn failed: Any { .. }', src/tools/clippy/clippy_lints/src/doc.rs:689:10
stack backtrace:
 0:     0x7fe0510f1b4c - std::backtrace_rs::backtrace::libunwind::trace::hac89ae696ab31153
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
 1:     0x7fe0510f1b4c - std::backtrace_rs::backtrace::trace_unsynchronized::he0e34c1ffcd1fd95
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 2:     0x7fe0510f1b4c - std::sys_common::backtrace::_print_fmt::hbbcd6534ff2cdaab
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:67:5
 3:     0x7fe0510f1b4c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hca373cbf95c63dfd
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:46:22
 4:     0x7fe05115268c - core::fmt::write::hf1bd4152e956a546
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/core/src/fmt/mod.rs:1168:17
 5:     0x7fe0510e0ec3 - std::io::Write::write_fmt::h2f14a980b941fea5
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/io/mod.rs:1660:15
 6:     0x7fe0510f6012 - std::sys_common::backtrace::_print::hc99e12058f69fd7f
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:49:5
 7:     0x7fe0510f6012 - std::sys_common::backtrace::print::h28ddbd216cc47c63
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:36:9
 8:     0x7fe0510f6012 - std::panicking::default_hook::{{closure}}::h91763e160bca83d2
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:211:50
 9:     0x7fe0510f5bf5 - std::panicking::default_hook::h04e711875c06f41e
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:228:9
10:     0x55cea4d1fa01 - clippy_driver[de939f5069ad0877]::ICE_HOOK::{closure#0}::{closure#0}
11:     0x7fe0510f67c5 - std::panicking::rust_panic_with_hook::h7d6693789c82cfe4
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:610:17
12:     0x7fe0510f64c0 - std::panicking::begin_panic_handler::{{closure}}::ha2fa99da9c892fdb
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:502:13
13:     0x7fe0510f1ff4 - std::sys_common::backtrace::__rust_end_short_backtrace::h6aa583a96333c408
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys_common/backtrace.rs:139:18
14:     0x7fe0510f61f9 - rust_begin_unwind
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/panicking.rs:498:5
15:     0x7fe0510bdec1 - core::panicking::panic_fmt::h5b13621b08c43b42
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/core/src/panicking.rs:107:14
16:     0x7fe0510bdfb3 - core::result::unwrap_failed::h8401f67cbdc649e8
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/core/src/result.rs:1690:5
17:     0x55cea4f9de93 - clippy_lints[3e536fcc5bfc7607]::doc::check_attrs
18:     0x55cea4f99d2a - <clippy_lints[3e536fcc5bfc7607]::doc::DocMarkdown as rustc_lint[791f8e2cef40682b]::passes::LateLintPass>::check_item
19:     0x7fe0526d10a1 - <rustc_lint[791f8e2cef40682b]::late::LateLintPassObjects as rustc_lint[791f8e2cef40682b]::passes::LateLintPass>::check_item
20:     0x7fe0519d4cde - <rustc_lint[791f8e2cef40682b]::late::LateContextAndPass<rustc_lint[791f8e2cef40682b]::late::LateLintPassObjects> as rustc_hir[b6231e5dfc545669]::intravisit::Visitor>::visit_nested_item
21:     0x7fe051971bb7 - rustc_hir[b6231e5dfc545669]::intravisit::walk_mod::<rustc_lint[791f8e2cef40682b]::late::LateContextAndPass<rustc_lint[791f8e2cef40682b]::late::LateLintPassObjects>>
22:     0x7fe0519d63dc - <rustc_lint[791f8e2cef40682b]::late::LateContextAndPass<rustc_lint[791f8e2cef40682b]::late::LateLintPassObjects> as rustc_hir[b6231e5dfc545669]::intravisit::Visitor>::visit_mod
23:     0x7fe0519d6b04 - rustc_lint[791f8e2cef40682b]::late::late_lint_pass_crate::<rustc_lint[791f8e2cef40682b]::late::LateLintPassObjects>
24:     0x7fe052b516f7 - <rustc_session[c20293ac279aad06]::session::Session>::time::<(), rustc_lint[791f8e2cef40682b]::late::check_crate<rustc_lint[791f8e2cef40682b]::BuiltinCombinedLateLintPass, rustc_interface[947fac54d3fe2868]::passes::analysis::{closure#5}::{closure#0}::{closure#3}::{closure#0}::{closure#0}>::{closure#0}::{closure#0}>
25:     0x7fe0537baae6 - <core[24291291a921b533]::panic::unwind_safe::AssertUnwindSafe<rustc_interface[947fac54d3fe2868]::passes::analysis::{closure#5}::{closure#0}::{closure#3}> as core[24291291a921b533]::ops::function::FnOnce<()>>::call_once
26:     0x7fe0537bc53e - <core[24291291a921b533]::panic::unwind_safe::AssertUnwindSafe<rustc_interface[947fac54d3fe2868]::passes::analysis::{closure#5}::{closure#0}> as core[24291291a921b533]::ops::function::FnOnce<()>>::call_once
27:     0x7fe0537b8948 - <rustc_session[c20293ac279aad06]::session::Session>::time::<(), rustc_interface[947fac54d3fe2868]::passes::analysis::{closure#5}>
28:     0x7fe053792ffc - rustc_interface[947fac54d3fe2868]::passes::analysis
29:     0x7fe053c37c05 - rustc_query_system[1b2734a6ce8acad3]::query::plumbing::try_execute_query::<rustc_query_impl[e097f5d713df899a]::plumbing::QueryCtxt, rustc_query_system[1b2734a6ce8acad3]::query::caches::DefaultCache<(), core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>>
30:     0x7fe053c90cf5 - rustc_query_system[1b2734a6ce8acad3]::query::plumbing::get_query::<rustc_query_impl[e097f5d713df899a]::queries::analysis, rustc_query_impl[e097f5d713df899a]::plumbing::QueryCtxt>
31:     0x7fe053773f30 - <rustc_interface[947fac54d3fe2868]::interface::Compiler>::enter::<rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}::{closure#2}, core[24291291a921b533]::result::Result<core[24291291a921b533]::option::Option<rustc_interface[947fac54d3fe2868]::queries::Linker>, rustc_errors[62a5cc7b06393f71]::ErrorReported>>
32:     0x7fe053755c3c - rustc_span[5840c952fc6dfb1f]::with_source_map::<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_interface[947fac54d3fe2868]::interface::create_compiler_and_run<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}>::{closure#1}>
33:     0x7fe05377330e - rustc_interface[947fac54d3fe2868]::interface::create_compiler_and_run::<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}>
34:     0x7fe05375719b - <scoped_tls[ec1705c99dfa8720]::ScopedKey<rustc_span[5840c952fc6dfb1f]::SessionGlobals>>::set::<rustc_interface[947fac54d3fe2868]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[947fac54d3fe2868]::interface::run_compiler<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}>::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>::{closure#0}::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>
35:     0x7fe053756f95 - std[e740e8867e95a171]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[947fac54d3fe2868]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[947fac54d3fe2868]::interface::run_compiler<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}>::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>
36:     0x7fe0537838a9 - <<std[e740e8867e95a171]::thread::Builder>::spawn_unchecked<rustc_interface[947fac54d3fe2868]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[947fac54d3fe2868]::interface::run_compiler<core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>, rustc_driver[aab467f4c82ed6ad]::run_compiler::{closure#1}>::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>::{closure#0}, core[24291291a921b533]::result::Result<(), rustc_errors[62a5cc7b06393f71]::ErrorReported>>::{closure#1} as core[24291291a921b533]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
37:     0x7fe051101cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9a9713b5d2e24fc2
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/alloc/src/boxed.rs:1854:9
38:     0x7fe051101cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9651309876a3c2bf
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/alloc/src/boxed.rs:1854:9
39:     0x7fe051101cf3 - std::sys::unix::thread::Thread::new::thread_start::h8f346e0de1984669
                             at /rustc/e012a191d768adeda1ee36a99ef8b92d51920154/library/std/src/sys/unix/thread.rs:108:17
40:     0x7fe050ff4259 - start_thread
41:     0x7fe050dd75e3 - __GI___clone
42:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.1.59 (e012a19 2022-01-06)

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
warning: 1 warning emitted