Building `rustc` using 1.69.0-nightly causes ICE

[stefins]

Meta

rustc --version --verbose:

rustc 1.69.0-nightly (44cfafe2f 2023-03-03)
binary: rustc
commit-hash: 44cfafe2fafe816395d3acc434663a45d5178c41
commit-date: 2023-03-03
host: aarch64-apple-darwin
release: 1.69.0-nightly
LLVM version: 15.0.7

Error output

thread 'rustc' panicked at 'index out of bounds: the len is 83963 but the index is 83963', /Users/user/rust/compiler/rustc_serialize/src/leb128.rs:84:1
stack backtrace:
   0:        0x10537e0fc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha53459bb6d4ff5af
   1:        0x1053ba93c - core::fmt::write::ha68623c3dae1f19c
   2:        0x10535058c - std::io::Write::write_fmt::h8b4aa58251300bed
   3:        0x10537df0c - std::sys_common::backtrace::print::hf6b477e8b0f24da8
   4:        0x10535769c - std::panicking::default_hook::{{closure}}::hdf638eb4797e9f83
   5:        0x105357360 - std::panicking::default_hook::h7d2e96dc1bd66553
thread 'rustc' panicked at 'index out of bounds: the len is 83963 but the index is 83963', /Users/rust/compiler/rustc_serialize/src/leb128.rs:84:1

Backtrace

thread 'rustc' panicked at 'index out of bounds: the len is 83963 but the index is 83963', /Users/user/rust/compiler/rustc_serialize/src/leb128.rs:84:1
stack backtrace:
   0:        0x10537e0fc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha53459bb6d4ff5af
   1:        0x1053ba93c - core::fmt::write::ha68623c3dae1f19c
   2:        0x10535058c - std::io::Write::write_fmt::h8b4aa58251300bed
   3:        0x10537df0c - std::sys_common::backtrace::print::hf6b477e8b0f24da8
   4:        0x10535769c - std::panicking::default_hook::{{closure}}::hdf638eb4797e9f83
   5:        0x105357360 - std::panicking::default_hook::h7d2e96dc1bd66553
thread 'rustc' panicked at 'index out of bounds: the len is 83963 but the index is 83963', /Users/user/rust/compiler/rustc_serialize/src/leb128.rs:84:1
stack backtrace:
   0:        0x104fd60fc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha53459bb6d4ff5af
   1:        0x10501293c - core::fmt::write::ha68623c3dae1f19c
   2:        0x104fa858c - std::io::Write::write_fmt::h8b4aa58251300bed
   3:        0x104fd5f0c - std::sys_common::backtrace::print::hf6b477e8b0f24da8
   4:        0x104faf69c - std::panicking::default_hook::{{closure}}::hdf638eb4797e9f83
   5:        0x104faf360 - std::panicking::default_hook::h7d2e96dc1bd66553
   6:        0x10d45d548 - rustc_driver_impl[2c1640858437bfcc]::DEFAULT_HOOK::{closure#0}::{closure#0}
   7:        0x105357e98 - std::panicking::rust_panic_with_hook::h8bd72f93f1dd6346
   8:        0x10537e428 - std::panicking::begin_panic_handler::{{closure}}::he25deed1e819e5a3
   9:        0x10537e234 - std::sys_common::backtrace::__rust_end_short_backtrace::h004e1bcecdd55ae0
  10:        0x1053579e8 - _rust_begin_unwind
  11:        0x1053f3d70 - core::panicking::panic_fmt::hc383220eeda95a7d
  12:        0x1053f3e6c - core::panicking::panic_bounds_check::h64ec5195473a6a08
  13:        0x110a8e564 - <rustc_metadata[585a1dc57f7966e1]::rmeta::decoder::DecodeContext>::read_lazy_table::<rustc_span[b2bfdd1fa2dd6c51]::hygiene::ExpnIndex, core[a27f259b2d86647a]::option::Option<rustc_metadata[585a1dc57f7966e1]::rmeta::LazyValue<rustc_span[b2bfdd1fa2dd6c51]::hygiene::ExpnHash>>>
  14:        0x110a3387c - <rustc_metadata[585a1dc57f7966e1]::rmeta::CrateRoot as rustc_serialize[c6dc7208c70a6adf]::serialize::Decodable<rustc_metadata[585a1dc57f7966e1]::rmeta::decoder::DecodeContext>>::decode
  15:        0x1109e2430 - <rustc_metadata[585a1dc57f7966e1]::locator::CrateLocator>::extract_one
  16:        0x1109e1210 - <rustc_metadata[585a1dc57f7966e1]::locator::CrateLocator>::extract_lib
  17:        0x1109e03dc - <rustc_metadata[585a1dc57f7966e1]::locator::CrateLocator>::find_library_crate
  18:        0x1109dee58 - <rustc_metadata[585a1dc57f7966e1]::locator::CrateLocator>::maybe_load_library_crate
  19:        0x110a2e634 - <rustc_metadata[585a1dc57f7966e1]::creader::CrateLoader>::load
  20:        0x110a2bdf8 - <rustc_metadata[585a1dc57f7966e1]::creader::CrateLoader>::maybe_resolve_crate
  21:        0x110a2d198 - <rustc_metadata[585a1dc57f7966e1]::creader::CrateLoader>::maybe_resolve_crate
  22:        0x110a30738 - <rustc_metadata[585a1dc57f7966e1]::creader::CrateLoader>::maybe_process_path_extern
  23:        0x10fd79f2c - <rustc_resolve[62768f244b3f99cb]::Resolver>::extern_prelude_get
  24:        0x10fd7cb78 - <rustc_resolve[62768f244b3f99cb]::Resolver>::early_resolve_ident_in_lexical_scope
  25:        0x10fd6390c - <rustc_resolve[62768f244b3f99cb]::Resolver>::resolve_path_with_ribs
  26:        0x10fd6c7b8 - <rustc_resolve[62768f244b3f99cb]::Resolver as rustc_expand[c6aaebe4e7f9fa19]::base::ResolverExpand>::resolve_imports
  27:        0x110bb5c00 - <rustc_expand[c6aaebe4e7f9fa19]::expand::MacroExpander>::fully_expand_fragment
  28:        0x110bb58ac - <rustc_expand[c6aaebe4e7f9fa19]::expand::MacroExpander>::expand_crate
  29:        0x10d512730 - <rustc_session[291aea7a051eb502]::session::Session>::time::<rustc_ast[1dec4150faa9cfed]::ast::Crate, rustc_interface[5ef73afcb5cdc05]::passes::configure_and_expand::{closure#1}>
  30:        0x10d56a790 - rustc_interface[5ef73afcb5cdc05]::passes::resolver_for_lowering
  31:        0x11049dea4 - rustc_query_system[261156c8aade9f9a]::query::plumbing::try_execute_query::<rustc_query_impl[1e91bdd1a483d3f7]::queries::resolver_for_lowering, rustc_query_impl[1e91bdd1a483d3f7]::plumbing::QueryCtxt>
  32:        0x1106eab8c - <rustc_query_impl[1e91bdd1a483d3f7]::Queries as rustc_middle[9c912325736899ce]::ty::query::QueryEngine>::resolver_for_lowering
  33:        0x10d4a3728 - <rustc_middle[9c912325736899ce]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[2c1640858437bfcc]::run_compiler::{closure#1}::{closure#2}::{closure#2}, &rustc_data_structures[8e38a7798467bd53]::steal::Steal<(rustc_middle[9c912325736899ce]::ty::ResolverAstLowering, alloc[317453980e41a223]::rc::Rc<rustc_ast[1dec4150faa9cfed]::ast::Crate>)>>
  34:        0x10d4a48c0 - <scoped_tls[b77997ce4a425]::ScopedKey<rustc_span[b2bfdd1fa2dd6c51]::SessionGlobals>>::set::<rustc_interface[5ef73afcb5cdc05]::interface::run_compiler<core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>, rustc_driver_impl[2c1640858437bfcc]::run_compiler::{closure#1}>::{closure#0}, core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>>
  35:        0x10d46a4c0 - std[40de7a8abf64919]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5ef73afcb5cdc05]::util::run_in_thread_pool_with_globals<rustc_interface[5ef73afcb5cdc05]::interface::run_compiler<core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>, rustc_driver_impl[2c1640858437bfcc]::run_compiler::{closure#1}>::{closure#0}, core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>>
  36:        0x10d463e38 - <<std[40de7a8abf64919]::thread::Builder>::spawn_unchecked_<rustc_interface[5ef73afcb5cdc05]::util::run_in_thread_pool_with_globals<rustc_interface[5ef73afcb5cdc05]::interface::run_compiler<core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>, rustc_driver_impl[2c1640858437bfcc]::run_compiler::{closure#1}>::{closure#0}, core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a27f259b2d86647a]::result::Result<(), rustc_span[b2bfdd1fa2dd6c51]::ErrorGuaranteed>>::{closure#1} as core[a27f259b2d86647a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:        0x105345820 - std::sys::unix::thread::Thread::new::thread_start::hef737176451774ed
  38:        0x19419206c - __pthread_deallocate

[saethlin]

I think the root cause of this issue was rustc incorrectly handling/reporting I/O errors. I've landed a number of PRs to address the problem; the most recent of those is #119510 which is now part of the latest stable toolchain, 1.77. Therefore, even though I have not reproduced exactly what you've reported here, I'm going to close this because I am reasonably confident that this bug is now fixed on stable.

Of course it is possible that I am wrong and the bug you've reported here is not fixed. If you happen to run into problems like this in 1.77 or later please do not hesitate to open a new issue.