Compiler panic

[marcbrevoort-cyberhive]

All I've got at the moment is

   Compiling aho-corasick v0.6.10
thread 'rustc' panicked at 'assertion failed: self.start_pos.to_u32() + total_extra_bytes <= bpos.to_u32()', compiler/rustc_span/src/lib.rs:1495:9
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 1.50.0-nightly (0f6f2d681 2020-12-06) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z instrument-coverage -C embed-bitcode=no -C debuginfo=2 -C codegen-units=1 -C opt-level=0 -C link-dead-code -C overflow-checks=off --crate-type lib

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

query stack during panic:
#0 [mir_promoted] processing `err::ERR_PACK`
#1 [mir_borrowck] borrow-checking `err::ERR_PACK`
end of query stack

Further examples in the comments.

[marcbrevoort-cyberhive]

Using nightly
info: using existing install for 'nightly-x86_64-unknown-linux-gnu'
info: default toolchain set to 'nightly-x86_64-unknown-linux-gnu'

  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.50.0-nightly (0f6f2d681 2020-12-06)

   Compiling openssl-sys v0.9.58
   Compiling native-tls v0.2.4
   Compiling rand_chacha v0.1.1
   Compiling rand_pcg v0.1.2
thread 'rustc' panicked at 'assertion failed: self.start_pos.to_u32() + total_extra_bytes <= bpos.to_u32()', compiler/rustc_span/src/lib.rs:1495:9
stack backtrace:
   0: rust_begin_unwind
             at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/core/src/panicking.rs:50:5
   3: rustc_span::SourceFile::lookup_file_pos
   4: <rustc_mir::transform::coverage::InstrumentCoverage as rustc_mir::transform::MirPass>::run_pass
   5: rustc_mir::transform::run_passes
   6: rustc_mir::transform::mir_promoted
   7: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_promoted>::compute
   8: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
   9: rustc_query_system::query::plumbing::get_query_impl
  10: rustc_mir::borrow_check::mir_borrowck
  11: core::ops::function::FnOnce::call_once
  12: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_borrowck>::compute
  13: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  14: rustc_data_structures::stack::ensure_sufficient_stack
  15: rustc_query_system::query::plumbing::get_query_impl
  16: rustc_query_system::query::plumbing::ensure_query_impl
  17: rustc_session::utils::<impl rustc_session::session::Session>::time
  18: rustc_interface::passes::analysis
  19: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  20: rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task
  21: rustc_data_structures::stack::ensure_sufficient_stack
  22: rustc_query_system::query::plumbing::get_query_impl
  23: rustc_interface::passes::QueryContext::enter
  24: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  25: rustc_span::with_source_map
  26: rustc_interface::interface::create_compiler_and_run
  27: scoped_tls::ScopedKey<T>::set
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 1.50.0-nightly (0f6f2d681 2020-12-06) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z instrument-coverage -C embed-bitcode=no -C debuginfo=2 -C codegen-units=1 -C opt-level=0 -C link-dead-code -C overflow-checks=off --crate-type lib

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

query stack during panic:
#0 [mir_promoted] processing `err::ERR_PACK`
#1 [mir_borrowck] borrow-checking `err::ERR_PACK`
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `openssl-sys`

[marcbrevoort-cyberhive]

Stack trace in full verbose mode

  Compiling openssl-sys v0.9.58
   Compiling bytes v0.4.12
thread 'rustc' panicked at 'assertion failed: self.start_pos.to_u32() + total_extra_bytes <= bpos.to_u32()', compiler/rustc_span/src/lib.rs:1495:9
stack backtrace:
   0:     0x7fe080bc56a7 - std::backtrace_rs::backtrace::libunwind::trace::h746c3e9529d524bc
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7fe080bc56a7 - std::backtrace_rs::backtrace::trace_unsynchronized::h86340908ff889faa
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fe080bc56a7 - std::sys_common::backtrace::_print_fmt::h43f85f9b18230404
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fe080bc56a7 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc132ae1a5b5aa7cd
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fe080c3951c - core::fmt::write::hdf023a0036d2a25f
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/core/src/fmt/mod.rs:1078:17
   5:     0x7fe080bb7692 - std::io::Write::write_fmt::h8580846154bcb66a
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/io/mod.rs:1519:15
   6:     0x7fe080bc93a5 - std::sys_common::backtrace::_print::h7ee55fed88d107a3
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fe080bc93a5 - std::sys_common::backtrace::print::h54a7d3e52a524177
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fe080bc93a5 - std::panicking::default_hook::{{closure}}::h60921e857bf55a40
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:208:50
   9:     0x7fe080bc8efa - std::panicking::default_hook::hf0f9afb1017317fc
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:225:9
  10:     0x7fe081480868 - rustc_driver::report_ice::hff78d76a39ffbb86
  11:     0x7fe080bc9ca6 - std::panicking::rust_panic_with_hook::h8d66bf42b407aaea
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:595:17
  12:     0x7fe080bc9797 - std::panicking::begin_panic_handler::{{closure}}::hde71edcd925d0c5e
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:495:13
  13:     0x7fe080bc5b6c - std::sys_common::backtrace::__rust_end_short_backtrace::h8a3c7d6cea578919
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys_common/backtrace.rs:141:18
  14:     0x7fe080bc9729 - rust_begin_unwind
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/panicking.rs:493:5
  15:     0x7fe080c35931 - core::panicking::panic_fmt::h20225113c4a2f8fd
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/core/src/panicking.rs:92:14
  16:     0x7fe080c3587d - core::panicking::panic::h35b77276aa4b0c12
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/core/src/panicking.rs:50:5
  17:     0x7fe08477da6b - rustc_span::SourceFile::lookup_file_pos::hca092a67fb0031d9
  18:     0x7fe082d7e282 - <rustc_mir::transform::coverage::InstrumentCoverage as rustc_mir::transform::MirPass>::run_pass::h63163fe939ee6941
  19:     0x7fe082ce0f4d - rustc_mir::transform::run_passes::hde85252c218e451d
  20:     0x7fe082ce1cea - rustc_mir::transform::mir_promoted::hbf030df47a64ef91
  21:     0x7fe082d37ec8 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_promoted>::compute::hd22b0a9058b7bb65
  22:     0x7fe082b5464b - rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}::hd68e6cb746e49f3c
  23:     0x7fe08293c559 - rustc_query_system::query::plumbing::get_query_impl::h20d9617555a285f4
  24:     0x7fe082d6c6d6 - rustc_mir::borrow_check::mir_borrowck::h8fcfde9d3bc3965f
  25:     0x7fe082d3f477 - core::ops::function::FnOnce::call_once::hda8d7f4d3e0163df
  26:     0x7fe0816c5fae - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_borrowck>::compute::h6c5455464ebb9737
  27:     0x7fe08167f530 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h5c4a029b2aaaad43
  28:     0x7fe0816c725b - rustc_data_structures::stack::ensure_sufficient_stack::h0ec271e889f1b221
  29:     0x7fe081662447 - rustc_query_system::query::plumbing::get_query_impl::h780e1793a19b633f
  30:     0x7fe081672dd9 - rustc_query_system::query::plumbing::ensure_query_impl::hac52838f4bbe8a0d
  31:     0x7fe08169d649 - rustc_session::utils::<impl rustc_session::session::Session>::time::h1b0e95cbe477ae94
  32:     0x7fe0816e2712 - rustc_interface::passes::analysis::h34f9b972d8af6f3d
  33:     0x7fe0814eb6eb - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h95ff81a8a73eaff3
  34:     0x7fe0814c7616 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task::h05a5aa3f40ff3b2d
  35:     0x7fe0814dc736 - rustc_data_structures::stack::ensure_sufficient_stack::h371083fbc17898bc
  36:     0x7fe08146abd5 - rustc_query_system::query::plumbing::get_query_impl::hcc63ca689fa3c69b
  37:     0x7fe0814f07bf - rustc_interface::passes::QueryContext::enter::h2071e0a8631ee0e4
  38:     0x7fe08142949e - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hd899306a06575d0c
  39:     0x7fe0814bc5f7 - rustc_span::with_source_map::ha4e07ff263d0dc1d
  40:     0x7fe08142a68b - rustc_interface::interface::create_compiler_and_run::h1d6d732867d1f489
  41:     0x7fe0814d6b60 - scoped_tls::ScopedKey<T>::set::h39c0aa543118d3f3
  42:     0x7fe0814dd346 - std::sys_common::backtrace::__rust_begin_short_backtrace::h1e5aa72fb9cd6d86
  43:     0x7fe08143207a - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc793837e985b77ce
  44:     0x7fe080bd965a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hea1090dbdcecbf5a
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/alloc/src/boxed.rs:1328:9
  45:     0x7fe080bd965a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8d5723d3912bd325
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/alloc/src/boxed.rs:1328:9
  46:     0x7fe080bd965a - std::sys::unix::thread::Thread::new::thread_start::hc17a425ca2995724
                               at /rustc/0f6f2d681b39c5f95459cd09cb936b6ceb27cd82/library/std/src/sys/unix/thread.rs:71:17
  47:     0x7fe08091314a - start_thread
  48:     0x7fe080238f23 - __GI___clone
  49:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

[camelid]

@marcbrevoort-cyberhive If you are able to, please provide some code that reproduces this.

[marcbrevoort-cyberhive]

I haven't narrowed it down to a specific code snippet, however it's panicking while compiling existing crates. It may be noteworthy that the compiler panic only occurs on the jenkins build environment but not on the dev box which, as far as I'm aware, builds from exactly the same sources.

[marcbrevoort-cyberhive]

#79725 seems to be similar to my report, both involving a coverage compiler panic when compiling openssl-sys.
In addition 39: 0x7fe0814bc5f7 - rustc_span::with_source_map::ha4e07ff263d0dc1d in my stack trace above further seems to support this hypothesis.

[richkadel]

Looks identical, and should be fixed when #79818 lands. It's in the CI queue now.

[tmandry]

Closing as duplicate of #79725.