Disk cache ICE with big array

[Spferical]

Code

fn main() {
    println!("{}", [37; 1073741825].len());
}

Meta

rustc --version --verbose:

rustc 1.48.0-nightly (397b390cc 2020-08-27)
binary: rustc
commit-hash: 397b390cc76ba1d98f80b2a24a371f708dcc9169
commit-date: 2020-08-27
host: x86_64-unknown-linux-gnu
release: 1.48.0-nightly
LLVM version: 11.0

I see similar behavior in stable 1.46.0:

rustc 1.46.0 (04488afe3 2020-08-24)
binary: rustc
commit-hash: 04488afe34512aa4c33566eb16d8c912a3ae04f9
commit-date: 2020-08-24
host: x86_64-unknown-linux-gnu
release: 1.46.0
LLVM version: 10.0

The example always succeeds to compile the first time, but uses a large amount of time and memory. time cargo build:

real	1:44.44
user	1:30.93
sys	4.967
maxmem	9673 MB
faults	0

Upon incremental re-compilation, I almost always see one of the following errors.

I saw other open issues with a similar error message as the 1.46.0 output below, but in this one the error is affected by the value the array was filled with.

Error output

cargo clean && cargo build && touch src/main.rs && cargo build:

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustc_middle/ty/query/on_disk_cache.rs:658:48
note: run with `RUST_BACKTRACE=1` environment variable to display a 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 1.48.0-nightly (397b390cc 2020-08-27) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: could not compile `ice3`.

To learn more, run the command again with --verbose.

Running sometimes yields a different yet similar error:

error: internal compiler error: src/librustc_middle/ty/query/on_disk_cache.rs:422:23: could not decode cached query result: invalid enum variant tag while decoding `Transparency`, expected 0..3

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:918:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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 1.48.0-nightly (397b390cc 2020-08-27) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: aborting due to previous error

error: could not compile `ice3`.

To learn more, run the command again with --verbose.

On 1.46.0:

thread 'rustc' panicked at 'index out of bounds: the len is 4 but the index is 37', src/librustc_middle/mir/interpret/mod.rs:272:35
note: run with `RUST_BACKTRACE=1` environment variable to display a 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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.46.0 (04488afe3 2020-08-24) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: could not compile `ice3`.

To learn more, run the command again with --verbose.

Backtrace

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustc_middle/ty/query/on_disk_cache.rs:658:48
stack backtrace:
   0: rust_begin_unwind
             at /rustc/397b390cc76ba1d98f80b2a24a371f708dcc9169/library/std/src/panicking.rs:475
   1: core::panicking::panic_fmt
             at /rustc/397b390cc76ba1d98f80b2a24a371f708dcc9169/library/core/src/panicking.rs:85
   2: core::panicking::panic
             at /rustc/397b390cc76ba1d98f80b2a24a371f708dcc9169/library/core/src/panicking.rs:50
   3: rustc_middle::ty::query::on_disk_cache::<impl rustc_serialize::serialize::Decodable<rustc_middle::ty::query::on_disk_cache::CacheDecoder> for rustc_span::hygiene::SyntaxContext>::decode
   4: rustc_span::hygiene::_DERIVE_rustc_serialize_Decodable_D_FOR_SyntaxContextData::<impl rustc_serialize::serialize::Decodable<__D> for rustc_span::hygiene::SyntaxContextData>::decode
   5: <rustc_middle::ty::query::on_disk_cache::CacheDecoder as rustc_middle::ty::codec::TyDecoder>::with_position
   6: rustc_middle::ty::query::on_disk_cache::<impl rustc_serialize::serialize::Decodable<rustc_middle::ty::query::on_disk_cache::CacheDecoder> for rustc_span::hygiene::SyntaxContext>::decode
   7: rustc_middle::ty::query::on_disk_cache::<impl rustc_serialize::serialize::Decodable<rustc_middle::ty::query::on_disk_cache::CacheDecoder> for rustc_span::span_encoding::Span>::decode
   8: rustc_middle::mir::_DERIVE_rustc_serialize_Decodable_D_FOR_SourceInfo::<impl rustc_serialize::serialize::Decodable<__D> for rustc_middle::mir::SourceInfo>::decode
   9: rustc_middle::mir::_DERIVE_rustc_serialize_Decodable_D_FOR_Statement::<impl rustc_serialize::serialize::Decodable<__D> for rustc_middle::mir::Statement>::decode
  10: rustc_serialize::serialize::Decoder::read_seq
  11: rustc_middle::mir::_DERIVE_rustc_serialize_Decodable_D_FOR_BasicBlockData::<impl rustc_serialize::serialize::Decodable<__D> for rustc_middle::mir::BasicBlockData>::decode
  12: rustc_serialize::serialize::Decoder::read_seq
  13: rustc_middle::mir::_DERIVE_rustc_serialize_Decodable_D_FOR_Body::<impl rustc_serialize::serialize::Decodable<__D> for rustc_middle::mir::Body>::decode
  14: rustc_middle::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
  15: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  16: rustc_query_system::query::plumbing::get_query_impl
  17: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::instance_mir
  18: rustc_mir::monomorphize::collector::collect_neighbours
  19: rustc_mir::monomorphize::collector::collect_items_rec
  20: rustc_session::utils::<impl rustc_session::session::Session>::time
  21: rustc_mir::monomorphize::collector::collect_crate_mono_items
  22: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  23: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute
  24: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  25: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  26: rustc_data_structures::stack::ensure_sufficient_stack
  27: rustc_query_system::query::plumbing::get_query_impl
  28: rustc_codegen_ssa::base::codegen_crate
  29: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  30: rustc_interface::passes::QueryContext::enter
  31: rustc_interface::queries::Queries::ongoing_codegen
  32: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  33: rustc_span::with_source_map
  34: rustc_interface::interface::create_compiler_and_run
  35: scoped_tls::ScopedKey<T>::set

error: internal compiler error: src/librustc_middle/ty/query/on_disk_cache.rs:422:23: could not decode cached query result: invalid enum variant tag while decoding `Transparency`, expected 0..3

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:918:9
stack backtrace:
   0: std::panicking::begin_panic
   1: rustc_errors::HandlerInner::bug
   2: rustc_errors::Handler::bug
   3: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
   4: rustc_middle::ty::context::tls::with_opt::{{closure}}
   5: rustc_middle::ty::context::tls::with_opt
   6: rustc_middle::util::bug::opt_span_bug_fmt
   7: rustc_middle::util::bug::bug_fmt
   8: rustc_middle::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
   9: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  10: rustc_query_system::query::plumbing::get_query_impl
  11: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::instance_mir
  12: rustc_mir::monomorphize::collector::collect_neighbours
  13: rustc_mir::monomorphize::collector::collect_items_rec
  14: rustc_session::utils::<impl rustc_session::session::Session>::time
  15: rustc_mir::monomorphize::collector::collect_crate_mono_items
  16: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  17: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute
  18: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  19: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  20: rustc_data_structures::stack::ensure_sufficient_stack
  21: rustc_query_system::query::plumbing::get_query_impl
  22: rustc_codegen_ssa::base::codegen_crate
  23: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  24: rustc_interface::passes::QueryContext::enter
  25: rustc_interface::queries::Queries::ongoing_codegen
  26: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  27: rustc_span::with_source_map
  28: rustc_interface::interface::create_compiler_and_run
  29: scoped_tls::ScopedKey<T>::set

On 1.46.0:

thread 'rustc' panicked at 'index out of bounds: the len is 4 but the index is 37', src/librustc_middle/mir/interpret/mod.rs:272:35
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1076
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1537
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:198
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:217
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:530
  12: rust_begin_unwind
             at src/libstd/panicking.rs:437
  13: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  14: core::panicking::panic_bounds_check
             at src/libcore/panicking.rs:62
  15: rustc_middle::mir::interpret::AllocDecodingSession::decode_alloc_id
  16: <(T10,T11) as rustc_serialize::serialize::Decodable>::decode
  17: rustc_serialize::serialize::Decoder::read_seq
  18: <rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra> as rustc_serialize::serialize::Decodable>::decode
  19: <rustc_middle::ty::query::on_disk_cache::CacheDecoder as rustc_middle::ty::codec::TyDecoder>::with_position
  20: rustc_middle::mir::interpret::AllocDecodingSession::decode_alloc_id
  21: <(T10,T11) as rustc_serialize::serialize::Decodable>::decode
  22: rustc_serialize::serialize::Decoder::read_seq
  23: <rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra> as rustc_serialize::serialize::Decodable>::decode
  24: <rustc_middle::mir::interpret::value::ConstValue as rustc_serialize::serialize::Decodable>::decode
  25: <core::result::Result<T1,T2> as rustc_serialize::serialize::Decodable>::decode
  26: rustc_middle::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
  27: rustc_middle::query::<impl rustc_query_system::query::config::QueryDescription<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::try_load_from_disk
  28: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  29: rustc_query_system::query::plumbing::get_query_impl
  30: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
  31: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve
  32: <rustc_trait_selection::traits::query::normalize::QueryNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_const
  33: <rustc_infer::infer::at::At as rustc_trait_selection::traits::query::normalize::AtExt>::normalize
  34: rustc_infer::infer::InferCtxtBuilder::enter
  35: rustc_traits::normalize_erasing_regions::normalize_generic_arg_after_erasing_regions
  36: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::normalize_generic_arg_after_erasing_regions>::compute
  37: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  38: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  39: rustc_query_system::query::plumbing::get_query_impl
  40: <rustc_middle::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle::ty::fold::TypeFolder>::fold_const
  41: rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::subst_and_normalize_erasing_regions
  42: <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_const
  43: <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_rvalue
  44: rustc_mir::monomorphize::collector::collect_neighbours
  45: rustc_mir::monomorphize::collector::collect_items_rec
  46: rustc_mir::monomorphize::collector::collect_crate_mono_items
  47: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  48: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute
  49: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  50: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  51: rustc_query_system::query::plumbing::get_query_impl
  52: rustc_codegen_ssa::base::codegen_crate
  53: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  54: rustc_session::utils::<impl rustc_session::session::Session>::time
  55: rustc_interface::passes::start_codegen
  56: rustc_middle::ty::context::tls::enter_global
  57: rustc_interface::queries::Queries::ongoing_codegen
  58: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  59: rustc_span::with_source_map
  60: rustc_interface::interface::create_compiler_and_run
  61: scoped_tls::ScopedKey<T>::set

[pnkfelix]

@Spferical do you know if this is still a problem for you?

@rustbot claim

[Spferical]

On 1.66.0, I still get an error upon incremental recompilation with the same code:

CARGO_INCREMENTAL=1 cargo clean && cargo build && touch src/main.rs && time cargo build
<snip; compiling succeeds the first time, then yields the following the second time>
thread '<unnamed>' panicked at 'invalid enum variant tag while decoding `Mutability`, expected 0..2', /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/compiler/rustc_ast/src/ast.rs:778:41

$ rustc --version --verbose
rustc 1.66.0 (69f9c33d7 2022-12-12)
binary: rustc
commit-hash: 69f9c33d71c871fc16ac445211281c6e7a340943
commit-date: 2022-12-12
host: x86_64-unknown-linux-gnu
release: 1.66.0
LLVM version: 15.0.2

Backtrace

stack backtrace:
   0:     0x7f5dfcb6c9a0 - std::backtrace_rs::backtrace::libunwind::trace::he615646ea344481f
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f5dfcb6c9a0 - std::backtrace_rs::backtrace::trace_unsynchronized::h6ea8eaac68705b9c
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5dfcb6c9a0 - std::sys_common::backtrace::_print_fmt::h7ac486a935ce0bf7
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f5dfcb6c9a0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1b5a095d3db2e28f
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f5dfcbc898e - core::fmt::write::h445545b92224a1cd
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/fmt/mod.rs:1209:17
   5:     0x7f5dfcb5cb15 - std::io::Write::write_fmt::h55a43474c6520b00
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/io/mod.rs:1682:15
   6:     0x7f5dfcb6c765 - std::sys_common::backtrace::_print::h65d20526fdb736b0
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f5dfcb6c765 - std::sys_common::backtrace::print::h6555fbe12a1cc41b
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f5dfcb6f56f - std::panicking::default_hook::{{closure}}::hbdf58083140e7ac6
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:267:22
   9:     0x7f5dfcb6f2aa - std::panicking::default_hook::haef8271c56b74d85
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:286:9
  10:     0x7f5dfcb6fd78 - std::panicking::rust_panic_with_hook::hfd45b6b6c12d9fa5
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:688:13
  11:     0x7f5dfcb6fad1 - std::panicking::begin_panic_handler::{{closure}}::hf591e8609a75bd4b
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:577:13
  12:     0x7f5dfcb6ce4c - std::sys_common::backtrace::__rust_end_short_backtrace::h81899558795e4ff7
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f5dfcb6f832 - rust_begin_unwind
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:575:5
  14:     0x7f5dfcbc5373 - core::panicking::panic_fmt::h4235fa9b4675b332
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/panicking.rs:65:14
  15:     0x7f5dfe3ff094 - <rustc_middle[1bbcd7fc39987e50]::mir::interpret::allocation::ConstAllocation as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  16:     0x7f5dfe3ff8f4 - <rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder as rustc_type_ir[1fd57c2de0aaa4ec]::codec::TyDecoder>::decode_alloc_id
  17:     0x7f5dfe3ff67d - <(rustc_target[1afba1ed92600763]::abi::Size, rustc_middle[1bbcd7fc39987e50]::mir::interpret::AllocId) as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  18:     0x7f5dfe3ff331 - <alloc[d987cf4402e5b40a]::vec::Vec<(rustc_target[1afba1ed92600763]::abi::Size, rustc_middle[1bbcd7fc39987e50]::mir::interpret::AllocId)> as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  19:     0x7f5dfe3fee62 - <rustc_middle[1bbcd7fc39987e50]::mir::interpret::allocation::ConstAllocation as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  20:     0x7f5dfe3ff8f4 - <rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder as rustc_type_ir[1fd57c2de0aaa4ec]::codec::TyDecoder>::decode_alloc_id
  21:     0x7f5dfea42760 - <rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  22:     0x7f5dfea42441 - <core[b97a30f8df81432d]::result::Result<rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue, rustc_middle[1bbcd7fc39987e50]::mir::interpret::error::ErrorHandled> as rustc_serialize[a15cbf6ce3209308]::serialize::Decodable<rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::CacheDecoder>>::decode
  23:     0x7f5dfea42246 - <rustc_query_impl[969f89a88b0ee9ca]::on_disk_cache::OnDiskCache>::try_load_query_result::<core[b97a30f8df81432d]::result::Result<rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue, rustc_middle[1bbcd7fc39987e50]::mir::interpret::error::ErrorHandled>>
  24:     0x7f5dfea41db0 - rustc_query_impl[969f89a88b0ee9ca]::plumbing::try_load_from_disk::<core[b97a30f8df81432d]::result::Result<rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue, rustc_middle[1bbcd7fc39987e50]::mir::interpret::error::ErrorHandled>>
  25:     0x7f5dfea41b14 - rustc_query_system[330b635d327008f7]::query::plumbing::try_load_from_disk_and_cache_in_memory::<rustc_query_impl[969f89a88b0ee9ca]::plumbing::QueryCtxt, rustc_middle[1bbcd7fc39987e50]::ty::ParamEnvAnd<rustc_middle[1bbcd7fc39987e50]::mir::interpret::GlobalId>, core[b97a30f8df81432d]::result::Result<rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue, rustc_middle[1bbcd7fc39987e50]::mir::interpret::error::ErrorHandled>>
  26:     0x7f5dfea3fd3f - rustc_query_system[330b635d327008f7]::query::plumbing::try_execute_query::<rustc_query_impl[969f89a88b0ee9ca]::plumbing::QueryCtxt, rustc_query_system[330b635d327008f7]::query::caches::DefaultCache<rustc_middle[1bbcd7fc39987e50]::ty::ParamEnvAnd<rustc_middle[1bbcd7fc39987e50]::mir::interpret::GlobalId>, core[b97a30f8df81432d]::result::Result<rustc_middle[1bbcd7fc39987e50]::mir::interpret::value::ConstValue, rustc_middle[1bbcd7fc39987e50]::mir::interpret::error::ErrorHandled>>>
  27:     0x7f5dff70e149 - <rustc_query_impl[969f89a88b0ee9ca]::Queries as rustc_middle[1bbcd7fc39987e50]::ty::query::QueryEngine>::eval_to_const_value_raw
  28:     0x7f5dfe8a0aa8 - <rustc_middle[1bbcd7fc39987e50]::ty::context::TyCtxt>::const_eval_resolve
  29:     0x7f5dfe8908a3 - rustc_monomorphize[a032594a6bc26d56]::collector::collect_neighbours
  30:     0x7f5dfe88a5c6 - rustc_monomorphize[a032594a6bc26d56]::collector::collect_items_rec
  31:     0x7f5dfee3941c - <rustc_session[87e5e219eb43521c]::session::Session>::time::<(), rustc_monomorphize[a032594a6bc26d56]::collector::collect_crate_mono_items::{closure#1}>
  32:     0x7f5dfee38f19 - rustc_monomorphize[a032594a6bc26d56]::collector::collect_crate_mono_items
  33:     0x7f5dfee38293 - rustc_monomorphize[a032594a6bc26d56]::partitioning::collect_and_partition_mono_items
  34:     0x7f5dff506aa7 - <rustc_query_system[330b635d327008f7]::dep_graph::graph::DepGraph<rustc_middle[1bbcd7fc39987e50]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[1bbcd7fc39987e50]::ty::context::TyCtxt, (), (&std[bbad73ae434e23e5]::collections::hash::set::HashSet<rustc_span[14998722174c1bca]::def_id::DefId, core[b97a30f8df81432d]::hash::BuildHasherDefault<rustc_hash[d2515752935e9cb7]::FxHasher>>, &[rustc_middle[1bbcd7fc39987e50]::mir::mono::CodegenUnit])>
  35:     0x7f5dff505c40 - rustc_query_system[330b635d327008f7]::query::plumbing::try_execute_query::<rustc_query_impl[969f89a88b0ee9ca]::plumbing::QueryCtxt, rustc_query_system[330b635d327008f7]::query::caches::DefaultCache<(), (&std[bbad73ae434e23e5]::collections::hash::set::HashSet<rustc_span[14998722174c1bca]::def_id::DefId, core[b97a30f8df81432d]::hash::BuildHasherDefault<rustc_hash[d2515752935e9cb7]::FxHasher>>, &[rustc_middle[1bbcd7fc39987e50]::mir::mono::CodegenUnit])>>
  36:     0x7f5dff50562b - rustc_query_system[330b635d327008f7]::query::plumbing::get_query::<rustc_query_impl[969f89a88b0ee9ca]::queries::collect_and_partition_mono_items, rustc_query_impl[969f89a88b0ee9ca]::plumbing::QueryCtxt>
  37:     0x7f5dff50556e - <rustc_query_impl[969f89a88b0ee9ca]::Queries as rustc_middle[1bbcd7fc39987e50]::ty::query::QueryEngine>::collect_and_partition_mono_items
  38:     0x7f5dff433e0a - rustc_codegen_ssa[737ec7dcbddbd4a0]::base::codegen_crate::<rustc_codegen_llvm[8e98f4afd2a755cb]::LlvmCodegenBackend>
  39:     0x7f5dff433bc2 - <rustc_codegen_llvm[8e98f4afd2a755cb]::LlvmCodegenBackend as rustc_codegen_ssa[737ec7dcbddbd4a0]::traits::backend::CodegenBackend>::codegen_crate
  40:     0x7f5dff0c8d69 - <rustc_session[87e5e219eb43521c]::session::Session>::time::<alloc[d987cf4402e5b40a]::boxed::Box<dyn core[b97a30f8df81432d]::any::Any>, rustc_interface[ee1a3f92e887e004]::passes::start_codegen::{closure#0}>
  41:     0x7f5dff0c86ba - <rustc_interface[ee1a3f92e887e004]::passes::QueryContext>::enter::<<rustc_interface[ee1a3f92e887e004]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[b97a30f8df81432d]::result::Result<alloc[d987cf4402e5b40a]::boxed::Box<dyn core[b97a30f8df81432d]::any::Any>, rustc_errors[21897ed46328f955]::ErrorGuaranteed>>
  42:     0x7f5dff087ea3 - <rustc_interface[ee1a3f92e887e004]::queries::Queries>::ongoing_codegen
  43:     0x7f5dff086fb2 - <rustc_interface[ee1a3f92e887e004]::interface::Compiler>::enter::<rustc_driver[9c4183344b2d0066]::run_compiler::{closure#1}::{closure#2}, core[b97a30f8df81432d]::result::Result<core[b97a30f8df81432d]::option::Option<rustc_interface[ee1a3f92e887e004]::queries::Linker>, rustc_errors[21897ed46328f955]::ErrorGuaranteed>>
  44:     0x7f5dff07eac2 - rustc_span[14998722174c1bca]::with_source_map::<core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>, rustc_interface[ee1a3f92e887e004]::interface::run_compiler<core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>, rustc_driver[9c4183344b2d0066]::run_compiler::{closure#1}>::{closure#0}::{closure#1}>
  45:     0x7f5dff07e5b9 - <scoped_tls[23afcff80b89ba49]::ScopedKey<rustc_span[14998722174c1bca]::SessionGlobals>>::set::<rustc_interface[ee1a3f92e887e004]::interface::run_compiler<core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>, rustc_driver[9c4183344b2d0066]::run_compiler::{closure#1}>::{closure#0}, core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>>
  46:     0x7f5dff07dbc8 - std[bbad73ae434e23e5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ee1a3f92e887e004]::util::run_in_thread_pool_with_globals<rustc_interface[ee1a3f92e887e004]::interface::run_compiler<core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>, rustc_driver[9c4183344b2d0066]::run_compiler::{closure#1}>::{closure#0}, core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>>
  47:     0x7f5dff07d8ec - <<std[bbad73ae434e23e5]::thread::Builder>::spawn_unchecked_<rustc_interface[ee1a3f92e887e004]::util::run_in_thread_pool_with_globals<rustc_interface[ee1a3f92e887e004]::interface::run_compiler<core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>, rustc_driver[9c4183344b2d0066]::run_compiler::{closure#1}>::{closure#0}, core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b97a30f8df81432d]::result::Result<(), rustc_errors[21897ed46328f955]::ErrorGuaranteed>>::{closure#1} as core[b97a30f8df81432d]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  48:     0x7f5e00a276a3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4273f95ec44459b3
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/alloc/src/boxed.rs:1987:9
  49:     0x7f5e00a276a3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h70f28fa4ddc269e5
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/alloc/src/boxed.rs:1987:9
  50:     0x7f5e00a276a3 - std::sys::unix::thread::Thread::new::thread_start::h85a9c16b988e2bd0
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys/unix/thread.rs:108:17
  51:     0x7f5dfc88cded - start_thread
  52:     0x7f5dfc912370 - __GI___clone3
  53:                0x0 - <unknown>

[saethlin]

Oh wow I didn't know anyone actually hit this so long ago! I turned this into a much nicer panic a few months ago: #110632