rust-lang / rust-lang/rust

Sporadic panic compiling with low available resources

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A-incr-comp C-bug I-ICE S-needs-repro T-compiler
Dominant language
Rust
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Description

Sadly I can't present a code, since it happens during compiling of a pretty big project on a system with low resources (2cpu). The error is not reproducible and happens usually when system is under pressure.

Meta

rustc --version --verbose:

rustc 1.78.0 (9b00956e5 2024-04-29)
binary: rustc
commit-hash: 9b00956e56009bab2aa15d7bff10916599e3d6d6
commit-date: 2024-04-29
host: x86_64-unknown-linux-gnu
release: 1.78.0
LLVM version: 18.1.2

sccache is also being used.

Backtrace 

thread 'rustc' panicked at compiler/rustc_metadata/src/rmeta/decoder.rs:456:36:
Missing SyntaxContext 1802102 for crate "openstack_cli"
stack backtrace:
stack backtrace:
   0:     0x7f228b0b4892 - std::backtrace_rs::backtrace::libunwind::trace::he4ee80166a02c846
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f228b0b4892 - std::backtrace_rs::backtrace::trace_unsynchronized::h476faccf57e88641
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f228b0b4892 - std::sys_common::backtrace::_print_fmt::h430c922a77e7a59c
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f228b0b4892 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hffecb437d922f988
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f228b105a6c - core::fmt::rt::Argument::fmt::hf3df69369399bfa9
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/fmt/rt.rs:142:9
   5:     0x7f228b105a6c - core::fmt::write::hd9a8d7d029f9ea1a
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/fmt/mod.rs:1153:17
   6:     0x7f228b0a978f - std::io::Write::write_fmt::h0e1226b2b8d973fe
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/io/mod.rs:1843:15
   7:     0x7f228b0b4664 - std::sys_common::backtrace::_print::hd2df4a083f6e69b8
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f228b0b4664 - std::sys_common::backtrace::print::he907f6ad7eee41cb
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f228b0b735b - std::panicking::default_hook::{{closure}}::h3926193b61c9ca9b
  10:     0x7f228b0b70b3 - std::panicking::default_hook::h25ba2457dea68e65
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:292:9
  11:     0x7f2287e2845d - std[e4dfbc2c3f4b09f1]::panicking::update_hook::<alloc[1adba907b9db1888]::boxed::Box<rustc_driver_impl[24a943716c49befe]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f228b0b7ac0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h022ca2c0d8c21c9e
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/alloc/src/boxed.rs:2034:9
  13:     0x7f228b0b7ac0 - std::panicking::rust_panic_with_hook::h0ad14d90dcf5224f
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:783:13
  14:     0x7f228b0b7802 - std::panicking::begin_panic_handler::{{closure}}::h4a1838a06f542647
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:657:13
  15:     0x7f228b0b4d66 - std::sys_common::backtrace::__rust_end_short_backtrace::h77cc4dc3567ca904
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f228b0b7534 - rust_begin_unwind
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:645:5
  17:     0x7f228b101f85 - core::panicking::panic_fmt::h940d4fd01a4b4fd1
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/panicking.rs:72:14
  18:     0x7f22891cd967 - <rustc_metadata[70192afe97828208]::rmeta::decoder::DecodeContext as rustc_span[a4517f2b2e65298c]::SpanDecoder>::decode_syntax_context
  19:     0x7f22891ceef1 - <rustc_metadata[70192afe97828208]::rmeta::decoder::DecodeContext as rustc_span[a4517f2b2e65298c]::SpanDecoder>::decode_span
  20:     0x7f22891c67fb - <rustc_middle[fda44fdb505d3e7f]::mir::Body as rustc_serialize[8411edc67acff09a]::serialize::Decodable<rustc_metadata[70192afe97828208]::rmeta::decoder::DecodeContext>>::decode
  21:     0x7f228970423d - rustc_metadata[70192afe97828208]::rmeta::decoder::cstore_impl::provide_extern::optimized_mir
  22:     0x7f2289703fad - rustc_query_impl[e4152ad88c3d6c78]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[e4152ad88c3d6c78]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7f2289394c99 - rustc_query_system[475239fef39bf53f]::query::plumbing::try_execute_query::<rustc_query_impl[e4152ad88c3d6c78]::DynamicConfig<rustc_query_system[475239fef39bf53f]::query::caches::DefIdCache<rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt, true>
  24:     0x7f2289c46f59 - rustc_query_impl[e4152ad88c3d6c78]::plumbing::force_from_dep_node::<rustc_query_impl[e4152ad88c3d6c78]::DynamicConfig<rustc_query_system[475239fef39bf53f]::query::caches::DefIdCache<rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 8usize]>>, false, false, false>>
  25:     0x7f22885cafcd - <rustc_query_impl[e4152ad88c3d6c78]::plumbing::query_callback<rustc_query_impl[e4152ad88c3d6c78]::query_impl::optimized_mir::QueryType>::{closure#0} as core[836963c7c1decc11]::ops::function::FnOnce<(rustc_middle[fda44fdb505d3e7f]::ty::context::TyCtxt, rustc_query_system[475239fef39bf53f]::dep_graph::dep_node::DepNode)>>::call_once
  26:     0x7f2289029055 - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  27:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  28:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  29:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  30:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  31:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  32:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  33:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  34:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  35:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  36:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  37:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  38:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  39:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  40:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  41:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  42:     0x7f2289028fbd - <rustc_query_system[475239fef39bf53f]::dep_graph::graph::DepGraphData<rustc_middle[fda44fdb505d3e7f]::dep_graph::DepsType>>::try_mark_previous_green::<rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  43:     0x7f2289390b19 - rustc_query_system[475239fef39bf53f]::query::plumbing::ensure_must_run::<rustc_query_impl[e4152ad88c3d6c78]::DynamicConfig<rustc_query_system[475239fef39bf53f]::query::caches::VecCache<rustc_hir[33aca5c26ba91407]::hir_id::OwnerId, rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt>
  44:     0x7f2289390cb7 - rustc_query_impl[e4152ad88c3d6c78]::query_impl::mir_drops_elaborated_and_const_checked::get_query_incr::__rust_end_short_backtrace
  45:     0x7f2289912284 - rustc_interface[ba2b6dc4c96cb491]::passes::analysis
  46:     0x7f22899118e5 - rustc_query_impl[e4152ad88c3d6c78]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[e4152ad88c3d6c78]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 1usize]>>
  47:     0x7f2289e9d375 - rustc_query_system[475239fef39bf53f]::query::plumbing::try_execute_query::<rustc_query_impl[e4152ad88c3d6c78]::DynamicConfig<rustc_query_system[475239fef39bf53f]::query::caches::SingleCache<rustc_middle[fda44fdb505d3e7f]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[e4152ad88c3d6c78]::plumbing::QueryCtxt, true>
  48:     0x7f2289e9cf9c - rustc_query_impl[e4152ad88c3d6c78]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  49:     0x7f2289bfc814 - rustc_interface[ba2b6dc4c96cb491]::interface::run_compiler::<core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>, rustc_driver_impl[24a943716c49befe]::run_compiler::{closure#0}>::{closure#0}
  50:     0x7f2289f3eb6e - std[e4dfbc2c3f4b09f1]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ba2b6dc4c96cb491]::util::run_in_thread_with_globals<rustc_interface[ba2b6dc4c96cb491]::interface::run_compiler<core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>, rustc_driver_impl[24a943716c49befe]::run_compiler::{closure#0}>::{closure#0}, core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>>
  51:     0x7f2289f3e9ca - <<std[e4dfbc2c3f4b09f1]::thread::Builder>::spawn_unchecked_<rustc_interface[ba2b6dc4c96cb491]::util::run_in_thread_with_globals<rustc_interface[ba2b6dc4c96cb491]::interface::run_compiler<core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>, rustc_driver_impl[24a943716c49befe]::run_compiler::{closure#0}>::{closure#0}, core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[836963c7c1decc11]::result::Result<(), rustc_span[a4517f2b2e65298c]::ErrorGuaranteed>>::{closure#1} as core[836963c7c1decc11]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  52:     0x7f228b0c1145 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h19b9e642d37e7272
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/alloc/src/boxed.rs:2020:9
  53:     0x7f228b0c1145 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h97265befc434d3ae
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/alloc/src/boxed.rs:2020:9
  54:     0x7f228b0c1145 - std::sys::pal::unix::thread::Thread::new::thread_start::h420dad5cf01a9f35
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys/pal/unix/thread.rs:108:17
  55:     0x7f2284ea91b7 - start_thread
  56:     0x7f2284f2b39c - __GI___clone3
  57:                0x0 - <unknown>

note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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: rustc 1.78.0 (9b00956e5 2024-04-29) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C incremental=[REDACTED] -C strip=debuginfo

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

query stack during panic:
#0 [optimized_mir] optimizing MIR for `openstack_cli::block_storage::v3::default_type::delete::DefaultTypeCommand::take_action::{closure#0}`
#1 [analysis] running analysis passes on this crate
end of query stack
there was a panic while trying to force a dep node
try_mark_green dep node stack:
#0 layout_of(50ce6e0430ea69d8-317261177dcface1)
#1 layout_of(4b1552e6bd747bc7-77ed0138a8d8d645)
#2 layout_of(4cf13c39e951339c-f5f82044666e223f)
#3 layout_of(a3dee3b30cf808c3-3a6e021221241706)
#4 layout_of(4f91719f6ca70abc-493fafac069970d0)
#5 layout_of(3a384e266c18be90-4b0fe244ec915ac2)
#6 layout_of(48ac620664a682ba-c326f5cce3af088)
#7 layout_of(c18751150576cec9-e8b4b127eac2f2e7)
#8 layout_of(234adbd073a917ac-5c716200772537f2)
#9 layout_of(706049fc7405dae3-3b7d1f7e90c1813c)
#10 layout_of(b81958a840e0f712-671f505983d84ea9)
#11 layout_of(e3beb139c38be6b4-f1976512ea2c9908)
#12 layout_of(5d504ab8a3fd0739-19489422ee55769e)
#13 layout_of(b2bb3ff529cfa3e0-747f09f5629d4e4a)
#14 layout_of(76aebd48c2d3fdb8-17f748b1343b4bbe)
#15 layout_of(b5b33ee778414687-f240d2dfa2fe6a1a)
#16 mir_drops_elaborated_and_const_checked(osc[a3b8]::main)
end of try_mark_green dep node stack
error: could not compile `openstack_cli` (bin "osc")

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  4. Open a pull request that references the issue number.

Research direction

Start with the panic location in compiler/rustc_metadata/src/rmeta/decoder.rs:456 and the backtrace through DecodeContext::decode_syntax_context, decode_span, and optimized_mir. Try to obtain a reproducible build using the reported low-resource conditions, rustc 1.78.0, and sccache. Done means the triggering conditions are understood and the compiler no longer panics, with a regression test if reproduction becomes possible.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
15/100

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