Panic when running UI tests with parallel-compiler = true and without -Z unstable-options

Steps to replicate: Check out jyn514@0e0bb7b and run x.py test src/test/ui.

---- [ui] ui/recursion/issue-26548-recursion-via-normalize.rs stdout ----

error: Error: expected failure status (Some(1)) but received status None.
status: signal: 6
command: "/home/joshua/rustc3/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" "/home/joshua/rustc3/src/test/ui/recursion/issue-26548-recursion-via-normalize.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zemit-future-incompat-report" "-C" "prefer-dynamic" "--out-dir" "/home/joshua/rustc3/build/x86_64-unknown-linux-gnu/test/ui/recursion/issue-26548-recursion-via-normalize" "-A" "unused" "-Crpath" "-O" "-Cdebuginfo=0" "-Lnative=/home/joshua/rustc3/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/home/joshua/rustc3/build/x86_64-unknown-linux-gnu/test/ui/recursion/issue-26548-recursion-via-normalize/auxiliary"
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
thread '<unnamed>' panicked at 'WorkerLocal can only be used on the thread pool it was created on', /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/worker_local.rs:47:17

Backtrace

stack backtrace:
   0: std::panicking::begin_panic
             at ./library/std/src/panicking.rs:519:12
   1: rustc_rayon_core::worker_local::WorkerLocal<T>::current
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/worker_local.rs:47:17
   2: <rustc_rayon_core::worker_local::WorkerLocal<T> as core::ops::deref::Deref>::deref
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/worker_local.rs:72:9
   3: rustc_metadata::rmeta::decoder::cstore_impl::provide_extern::item_children
             at ./compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:225:9
   4: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:365:14
   5: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
   6: stacker::maybe_grow
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
   7: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
   8: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_query_impl/src/plumbing.rs:169:17
   9: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1723:50
  10: rustc_rayon_core::tlv::with
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/tlv.rs:19:5
  11: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1681:9
  12: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1723:9
  13: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query::{{closure}}
             at ./compiler/rustc_query_impl/src/plumbing.rs:168:13
  14: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1767:13
  15: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1751:40
  16: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1740:22
  17: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1751:9
  18: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1764:9
  19: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query
             at ./compiler/rustc_query_impl/src/plumbing.rs:157:9
  20: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:617:9
  21: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:328:18
  22: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:616:51
  23: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:444:16
  24: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:664:5
  25: rustc_query_system::query::plumbing::get_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:775:9
  26: rustc_middle::ty::query::TyCtxtAt::item_children
             at ./compiler/rustc_middle/src/ty/query/mod.rs:205:17
  27: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::item_children
             at ./compiler/rustc_middle/src/ty/query/mod.rs:186:17
  28: rustc_metadata::rmeta::decoder::cstore_impl::provide::{{closure}}
             at ./compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:371:34
  29: core::ops::function::FnOnce::call_once
             at ./library/core/src/ops/function.rs:227:5
  30: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::visible_parent_map>::compute
             at ./compiler/rustc_query_impl/src/plumbing.rs:400:17
  31: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:365:14
  32: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
  33: stacker::maybe_grow
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
  34: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
  35: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_query_impl/src/plumbing.rs:169:17
  36: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1723:50
  37: rustc_rayon_core::tlv::with
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/tlv.rs:19:5
  38: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1681:9
  39: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1723:9
  40: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query::{{closure}}
             at ./compiler/rustc_query_impl/src/plumbing.rs:168:13
  41: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1767:13
  42: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1751:40
  43: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1740:22
  44: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1751:9
  45: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1764:9
  46: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query
             at ./compiler/rustc_query_impl/src/plumbing.rs:157:9
  47: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:617:9
  48: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:328:18
  49: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:616:51
  50: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:444:16
  51: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:664:5
  52: rustc_query_system::query::plumbing::get_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:775:9
  53: rustc_middle::ty::query::TyCtxtAt::visible_parent_map
             at ./compiler/rustc_middle/src/ty/query/mod.rs:205:17
  54: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::visible_parent_map
             at ./compiler/rustc_middle/src/ty/query/mod.rs:186:17
  55: rustc_middle::ty::print::pretty::PrettyPrinter::try_print_visible_def_path_recur
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:362:34
  56: rustc_middle::ty::print::pretty::PrettyPrinter::try_print_visible_def_path
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:270:9
  57: <rustc_middle::ty::print::pretty::FmtPrinter<F> as rustc_middle::ty::print::Printer>::print_def_path
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1357:19
  58: rustc_middle::ty::print::Printer::default_print_def_path::{{closure}}
             at ./compiler/rustc_middle/src/ty/print/mod.rs:146:42
  59: <rustc_middle::ty::print::pretty::FmtPrinter<F> as rustc_middle::ty::print::Printer>::path_generic_args
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1512:16
  60: rustc_middle::ty::print::Printer::default_print_def_path
             at ./compiler/rustc_middle/src/ty/print/mod.rs:145:40
  61: <rustc_middle::ty::print::pretty::FmtPrinter<F> as rustc_middle::ty::print::Printer>::print_def_path
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1394:9
  62: rustc_middle::ty::print::pretty::PrettyPrinter::pretty_print_type
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:581:17
  63: <rustc_middle::ty::print::pretty::FmtPrinter<F> as rustc_middle::ty::print::Printer>::print_type
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1404:13
  64: <&rustc_middle::ty::TyS as rustc_middle::ty::print::Print<P>>::print
             at ./compiler/rustc_middle/src/ty/print/mod.rs:342:9
  65: rustc_middle::ty::print::pretty::<impl core::fmt::Display for &rustc_middle::ty::TyS>::fmt::{{closure}}
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1890:21
  66: rustc_middle::ty::context::tls::with::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1778:32
  67: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1751:40
  68: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1740:22
  69: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1751:9
  70: rustc_middle::ty::context::tls::with
             at ./compiler/rustc_middle/src/ty/context.rs:1778:9
  71: rustc_middle::ty::print::pretty::<impl core::fmt::Display for &rustc_middle::ty::TyS>::fmt
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:1889:17
  72: core::fmt::write
             at ./library/core/src/fmt/mod.rs:1092:17
  73: core::fmt::Write::write_fmt
             at ./library/core/src/fmt/mod.rs:182:9
  74: alloc::fmt::format
             at ./library/alloc/src/fmt.rs:578:5
  75: rustc_query_impl::plumbing::<impl rustc_query_system::query::config::QueryDescription<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::layout_raw>::describe::{{closure}}
             at ./compiler/rustc_middle/src/query/mod.rs:12:1
  76: rustc_middle::ty::print::pretty::with_no_trimmed_paths::{{closure}}
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:107:22
  77: std::thread::local::LocalKey<T>::try_with
             at ./library/std/src/thread/local.rs:272:16
  78: std::thread::local::LocalKey<T>::with
             at ./library/std/src/thread/local.rs:248:9
  79: rustc_middle::ty::print::pretty::with_no_trimmed_paths
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:105:5
  80: rustc_query_impl::plumbing::<impl rustc_query_system::query::config::QueryDescription<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::layout_raw>::describe
             at ./compiler/rustc_middle/src/query/mod.rs:12:1
  81: rustc_query_impl::make_query::layout_raw::{{closure}}
             at ./compiler/rustc_query_impl/src/plumbing.rs:328:24
  82: rustc_middle::ty::print::pretty::with_forced_impl_filename_line::{{closure}}
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:85:22
  83: std::thread::local::LocalKey<T>::try_with
             at ./library/std/src/thread/local.rs:272:16
  84: std::thread::local::LocalKey<T>::with
             at ./library/std/src/thread/local.rs:248:9
  85: rustc_middle::ty::print::pretty::with_forced_impl_filename_line
             at ./compiler/rustc_middle/src/ty/print/pretty.rs:83:5
  86: rustc_query_impl::make_query::layout_raw
             at ./compiler/rustc_query_impl/src/plumbing.rs:326:35
  87: rustc_query_system::query::plumbing::QueryState<D,K>::try_collect_active_jobs::{{closure}}::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:138:67
  88: core::iter::adapters::filter_map::filter_map_fold::{{closure}}
             at ./library/core/src/iter/adapters/filter_map.rs:36:28
  89: core::iter::traits::iterator::Iterator::fold
             at ./library/core/src/iter/traits/iterator.rs:2122:21
  90: <core::iter::adapters::filter_map::FilterMap<I,F> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/filter_map.rs:85:9
  91: <core::iter::adapters::flatten::FlattenCompat<I,U> as core::iter::traits::iterator::Iterator>::fold::flatten::{{closure}}
             at ./library/core/src/iter/adapters/flatten.rs:336:27
  92: core::iter::adapters::map::map_fold::{{closure}}
             at ./library/core/src/iter/adapters/map.rs:81:21
  93: <core::iter::adapters::enumerate::Enumerate<I> as core::iter::traits::iterator::Iterator>::fold::enumerate::{{closure}}
             at ./library/core/src/iter/adapters/enumerate.rs:104:27
  94: core::iter::traits::iterator::Iterator::fold
             at ./library/core/src/iter/traits/iterator.rs:2122:21
  95: <core::iter::adapters::enumerate::Enumerate<I> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/enumerate.rs:110:9
  96: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/map.rs:121:9
  97: <core::iter::adapters::fuse::Fuse<I> as core::iter::adapters::fuse::FuseImpl<I>>::fold
             at ./library/core/src/iter/adapters/fuse.rs:458:9
  98: <core::iter::adapters::fuse::Fuse<I> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/fuse.rs:105:9
  99: <core::iter::adapters::flatten::FlattenCompat<I,U> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/flatten.rs:343:16
 100: <core::iter::adapters::flatten::FlatMap<I,U,F> as core::iter::traits::iterator::Iterator>::fold
             at ./library/core/src/iter/adapters/flatten.rs:74:9
 101: core::iter::traits::iterator::Iterator::for_each
             at ./library/core/src/iter/traits/iterator.rs:774:9
 102: <hashbrown::map::HashMap<K,V,S> as core::iter::traits::collect::Extend<(K,V)>>::extend
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.9.0/src/map.rs:3041:9
 103: <std::collections::hash::map::HashMap<K,V,S> as core::iter::traits::collect::Extend<(K,V)>>::extend
             at ./library/std/src/collections/hash/map.rs:2714:9
 104: rustc_query_system::query::plumbing::QueryState<D,K>::try_collect_active_jobs
             at ./compiler/rustc_query_system/src/query/plumbing.rs:134:9
 105: rustc_query_impl::Queries::try_collect_active_jobs
             at ./compiler/rustc_query_impl/src/plumbing.rs:539:21
 106: <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::try_collect_active_jobs
             at ./compiler/rustc_query_impl/src/plumbing.rs:54:9
 107: rustc_query_system::query::job::deadlock
             at ./compiler/rustc_query_system/src/query/job.rs:559:21
 108: rustc_interface::util::handle_deadlock::{{closure}}::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:179:58
 109: rustc_middle::ty::context::tls::with::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1778:32
 110: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1751:40
 111: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1740:22
 112: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1751:9
 113: rustc_middle::ty::context::tls::with
             at ./compiler/rustc_middle/src/ty/context.rs:1778:9
 114: rustc_interface::util::handle_deadlock::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:179:42
 115: scoped_tls::ScopedKey<T>::set
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137:9
 116: rustc_interface::util::handle_deadlock::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:178:13
 117: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1723:50
 118: rustc_rayon_core::tlv::with
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/tlv.rs:19:5
 119: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1681:9
 120: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1723:9
 121: rustc_interface::util::handle_deadlock::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:177:9
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.52.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z threads=1 -Z ui-testing -Z deduplicate-diagnostics=no -Z emit-future-incompat-report -C prefer-dynamic -C rpath -C debuginfo=0

query stack during panic:
end of query stack
deadlock handler panicked, aborting process

------------------------------------------

Relevant part of the backtrace looks like

   2: <rustc_rayon_core::worker_local::WorkerLocal<T> as core::ops::deref::Deref>::deref
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/rustc-rayon-core-0.3.0/src/worker_local.rs:72:9
   3: rustc_metadata::rmeta::decoder::cstore_impl::provide_extern::item_children
             at ./compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:225:9

rust/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

Line 225 in 573a697

tcx.arena.alloc_slice(&result)

rust/compiler/rustc_middle/src/ty/context.rs

Line 929 in 573a697

pub arena: &'tcx WorkerLocal<Arena<'tcx>>,

This seems to be non-deterministic - I ran it again and it succeeded 😕

Oh oops, I also had parallel-compiler = true. Let me try turning that off.

Triage: Can this still be reproduced? (I would try it myself unless it required checking out a non-official commit. Also see #75760 (comment).)

UI test suite now supports testing in parallel mode, and this test wasn't observed to fail during it.
I'm also closing parallel frontend issues without reproduction reported before 2024 in general, a lot of things changes since then, and no other similar issues were reported.
Please reopen if it ever happens again.

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Panic when running UI tests with `parallel-compiler = true` and without -Z unstable-options #82636

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Panic when running UI tests with parallel-compiler = true and without -Z unstable-options #82636

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jyn514 commented on Feb 28, 2021

jyn514 commented on Feb 28, 2021

jyn514 commented on Feb 28, 2021

Enselic commented on Oct 18, 2025

petrochenkov commented on Jun 11, 2026

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Panic when running UI tests with `parallel-compiler = true` and without -Z unstable-options #82636