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parallel compiler: `assertion failed: found_cycle` #115223

Open matthiaskrgr opened 1 year ago

matthiaskrgr commented 1 year ago

Code

This is on top of https://github.com/Zoxc/rust/tree/missing-cycle-test code from a rustdoc test

#![crate_name = "foo"]

use std::ops;

pub struct Foo;

impl Foo {
    pub fn foo(&mut self) {}
}

// @has foo/struct.Bar.html
// @has - '//*[@class="sidebar-elems"]//*[@class="block"]//a[@href="#method.foo"]' 'foo'
pub struct Bar {
    foo: Foo,
}

impl ops::Deref for Bar {
    type Target = Foo;

    fn deref(&self) -> &Foo {
        &self.foo
    }
}

impl ops::DerefMut for Bar {
    fn deref_mut(&mut self) -> &mut Foo {
        &mut self.foo
    }
}

Meta

Unfortunately I needed a BUNCH of tries to reproduce this

Backtrace

``` ~/.rustup/toolchains/local-debug-assertions/bin/rustc deref-mut-methods.rs --crate-type lib -Zthreads=10 thread '' panicked at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_query_system/src/query/job.rs:556:5: assertion failed: found_cycle stack backtrace: 0: 0x7f18fc942521 - std::backtrace_rs::backtrace::libunwind::trace::h818fd7fcd2897c6b at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5 1: 0x7f18fc942521 - std::backtrace_rs::backtrace::trace_unsynchronized::hf2d8941579cdb3be at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f18fc942521 - std::sys_common::backtrace::_print_fmt::he4a494b921534d89 at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:67:5 3: 0x7f18fc942521 - ::fmt::h5a3fdc94d861e4aa at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7f18fc9b5107 - core::fmt::rt::Argument::fmt::h4a90583b766ae427 at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/fmt/rt.rs:138:9 5: 0x7f18fc9b5107 - core::fmt::write::h6089469c4b40ae1f at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/fmt/mod.rs:1094:21 6: 0x7f18fc91fc05 - std::io::Write::write_fmt::h897693c3d30f01da at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/io/mod.rs:1714:15 7: 0x7f18fc9422f4 - std::sys_common::backtrace::_print::hb4dbec298bba652d at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7f18fc9422f4 - std::sys_common::backtrace::print::h9ddc492b2d8467df at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7f18fc94e52f - std::panicking::panic_hook_with_disk_dump::{{closure}}::h940f867d76beae55 10: 0x7f18fc94e17b - std::panicking::panic_hook_with_disk_dump::h5e02febb31a69553 at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:312:9 11: 0x7f18ff6a54b0 - rustc_driver_impl[2e22a4f0ec595adf]::install_ice_hook::{closure#0} at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_driver_impl/src/lib.rs:1335:13 12: 0x7f18fc94ee78 - as core::ops::function::Fn>::call::h05114cf4e5ed0f4a at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2021:9 13: 0x7f18fc94ee78 - std::panicking::rust_panic_with_hook::h40904d4b98be6c90 at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:733:13 14: 0x7f18fc942981 - std::panicking::begin_panic_handler::{{closure}}::h0b4db4639685b376 at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:619:13 15: 0x7f18fc9427b6 - std::sys_common::backtrace::__rust_end_short_backtrace::hcbd9c82d981610ed at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:170:18 16: 0x7f18fc94e9e2 - rust_begin_unwind at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:617:5 17: 0x7f18fc9d8093 - core::panicking::panic_fmt::h6c5efd4701442ee1 at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panicking.rs:67:14 18: 0x7f18fc9d8125 - core::panicking::panic::h21a5475c4c7a4bc1 at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panicking.rs:117:5 19: 0x7f18ff671157 - rustc_query_system[ca0fea7cc8dea863]::query::job::deadlock:: at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_query_system/src/query/job.rs:556:5 20: 0x7f18ff68decd - rustc_interface[ce4c9a8aa2f4660b]::util::run_in_thread_pool_with_globals::, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1} at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_interface/src/util.rs:214:35 21: 0x7f18ff68decd - std[81a1ea1164486f60]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()> at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:154:18 22: 0x7f18ff65477c - ::spawn_unchecked_::, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1}::{closure#0} at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/thread/mod.rs:529:17 23: 0x7f18ff65477c - ::spawn_unchecked_, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1}::{closure#0}> as core[eb9f5097525910b2]::ops::function::FnOnce<()>>::call_once at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panic/unwind_safe.rs:271:9 24: 0x7f18ff65477c - std[81a1ea1164486f60]::panicking::try::do_call::::spawn_unchecked_, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1}::{closure#0}>, ()> at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:524:40 25: 0x7f18ff65477c - std[81a1ea1164486f60]::panicking::try::<(), core[eb9f5097525910b2]::panic::unwind_safe::AssertUnwindSafe<::spawn_unchecked_, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1}::{closure#0}>> at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:488:19 26: 0x7f18ff65477c - std[81a1ea1164486f60]::panic::catch_unwind::::spawn_unchecked_, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1}::{closure#0}>, ()> at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panic.rs:142:14 27: 0x7f18ff65477c - ::spawn_unchecked_::, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1} at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/thread/mod.rs:528:30 28: 0x7f18ff65477c - <::spawn_unchecked_, rustc_driver_impl[2e22a4f0ec595adf]::run_compiler::{closure#1}>::{closure#0}, core[eb9f5097525910b2]::result::Result<(), rustc_span[5060e7939b3129d]::ErrorGuaranteed>>::{closure#1}::{closure#1}, ()>::{closure#1} as core[eb9f5097525910b2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/ops/function.rs:250:5 29: 0x7f18fc940439 - as core::ops::function::FnOnce>::call_once::h197d07c7abf2c25e at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2007:9 30: 0x7f18fc940439 - as core::ops::function::FnOnce>::call_once::hcb59e37a449b5256 at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2007:9 31: 0x7f18fc94f895 - std::sys::unix::thread::Thread::new::thread_start::h699f0086e43bdec6 at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys/unix/thread.rs:108:17 32: 0x7f18fc48c9eb - 33: 0x7f18fc510ebc - 34: 0x0 - 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 attach the file at `/tmp/par/rustc-ice-2023-08-25T19:33:47.445875318Z-4142659.txt` to your bug report note: compiler flags: --crate-type lib -Z threads=10 query stack during panic: end of query stack deadlock handler panicked, aborting process [1] 4142659 IOT instruction ~/.rustup/toolchains/local-debug-assertions/bin/rustc deref-mut-methods.rs ```

zetanumbers commented 4 weeks ago

Excuse me, but can you describe your CPU that have reproduced this issue?