ICE - 'index out of bounds: the len is 5 but the index is 5', compiler\rustc_middle\src\ty\query\on_disk_cache.rs:458:9

[RustyYato]

Code

I don't have a minimal example, because whenever I try to minimize this the ICE goes away. So far, removing any top-level items including, types, modules, or functions will cause the ICE to go away (even if the function is put back). So I believe that this is a caching issue. (further evidenced by compiler\rustc_middle\src\ty\query\on_disk_cache.rs)

This branch contains all the build artifacts, and I can consistently reproduce the ICE if I revert back to this branch.

https://github.com/RustyYato/svec/tree/ICE

edit: currently, you need to build with --features nightly enabled to see the ICE

Meta

rustc --version --verbose:

rustc 1.50.0-nightly (3d6705aa5 2020-12-07)
binary: rustc
commit-hash: 3d6705aa5abffe94c83bf09af8c3ba3c599845fc
commit-date: 2020-12-07
host: x86_64-pc-windows-msvc
release: 1.50.0-nightly

Error output

thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', compiler\rustc_middle\src\ty\query\on_disk_cache.rs:458:9

Backtrace

thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', compiler\rustc_middle\src\ty\query\on_disk_cache.rs:458:9
stack backtrace:
   0:     0x7ffbc020b865 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h106ca6f8fb6a294d
   1:     0x7ffbc023727b - core::fmt::write::h6390b994d95aebdb
   2:     0x7ffbc01fcefd - <std::io::IoSlice as core::fmt::Debug>::fmt::hd713332ae62141f3
   3:     0x7ffbc020fbdd - std::panicking::take_hook::h78f8a454f3a4df82
   4:     0x7ffbc020f66a - std::panicking::take_hook::h78f8a454f3a4df82
   5:     0x7ffba5661127 - rustc_driver::report_ice::h4bc3647b6f621de8
   6:     0x7ffbc0210730 - std::panicking::rust_panic_with_hook::h931fd6f26be82856
   7:     0x7ffbc0210201 - rust_begin_unwind
   8:     0x7ffbc020c20f - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h106ca6f8fb6a294d
   9:     0x7ffbc0210159 - rust_begin_unwind
  10:     0x7ffbc02332f0 - core::panicking::panic_fmt::h45da916c710b88f7
  11:     0x7ffbc02332b7 - core::panicking::panic_bounds_check::h9e2c85f20a0ccdcd
  12:     0x7ffba9af02b6 - rustc_middle::ty::query::on_disk_cache::OnDiskCache::compute_cnum_map::hbae92ac2867b06ae
  13:     0x7ffba98fcab9 - rustc_middle::ty::query::force_from_dep_node::h841e1a791cab1f4a
  14:     0x7ffba5845a48 - <rustc_interface::proc_macro_decls::Finder as rustc_hir::itemlikevisit::ItemLikeVisitor>::visit_item::h0346e58da83a9175
  15:     0x7ffba584583a - <rustc_interface::proc_macro_decls::Finder as rustc_hir::itemlikevisit::ItemLikeVisitor>::visit_item::h0346e58da83a9175
  16:     0x7ffba5837a13 - <rustc_interface::proc_macro_decls::Finder as rustc_hir::itemlikevisit::ItemLikeVisitor>::visit_item::h0346e58da83a9175
  17:     0x7ffba58b16b3 - rustc_interface::passes::BoxedResolver::complete::h22e285b7f419ed0b
  18:     0x7ffba585946b - rustc_interface::interface::parse_cfgspecs::he4e421c50de55949
  19:     0x7ffba588ea61 - rustc_interface::passes::QueryContext::print_stats::h34b3c30905286de8
  20:     0x7ffba56c2e4b - <rustc_expand::mbe::macro_parser::MatcherPosHandle as core::ops::deref::DerefMut>::deref_mut::h130ca4adb9e78d16
  21:     0x7ffba56c6066 - <rustc_expand::mbe::macro_parser::MatcherPosHandle as core::ops::deref::DerefMut>::deref_mut::h130ca4adb9e78d16
  22:     0x7ffba56a7513 - <rustc_driver::args::Error as core::fmt::Debug>::fmt::hb838ed2d57a61e3c
  23:     0x7ffba56b7826 - rustc_ast::util::parser::prec_let_scrutinee_needs_par::h0da38a96661182e5
  24:     0x7ffba5643ccc - <rustc_middle::ty::SymbolName as core::fmt::Display>::fmt::he2ea99b1945e8c7f
  25:     0x7ffba56c7f2b - <rustc_expand::mbe::macro_parser::MatcherPosHandle as core::ops::deref::DerefMut>::deref_mut::h130ca4adb9e78d16
  26:     0x7ffba5608b38 - <rustc_codegen_ssa::back::linker::MsvcLinker as rustc_codegen_ssa::back::linker::Linker>::no_crt_objects::h47dd01e667a15f55
  27:     0x7ffba5699aac - <rustc_driver::args::Error as core::fmt::Debug>::fmt::hb838ed2d57a61e3c
  28:     0x7ffba5609bfc - <rustc_codegen_ssa::back::linker::MsvcLinker as rustc_codegen_ssa::back::linker::Linker>::no_crt_objects::h47dd01e667a15f55
  29:     0x7ffba56b0f84 - <rustc_driver::args::Error as core::fmt::Debug>::fmt::hb838ed2d57a61e3c
  30:     0x7ffba56b8270 - rustc_ast::util::parser::prec_let_scrutinee_needs_par::h0da38a96661182e5
  31:     0x7ffba5612a3d - <rustc_codegen_ssa::back::linker::MsvcLinker as rustc_codegen_ssa::back::linker::Linker>::no_crt_objects::h47dd01e667a15f55
  32:     0x7ffbc021f4f7 - std::sys::windows::thread::Thread::new::h05d768f6146b61f1
  33:     0x7ffc07127034 - BaseThreadInitThunk
  34:     0x7ffc07e9cec1 - RtlUserThreadStart

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 (3d6705aa5 2020-12-07) running on x86_64-pc-windows-msvc

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

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

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `svec`

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

[RustyYato]

I've minimized the ICE branch on svec that I linked above. Removing anything causes the ICE to disappear, and not come back until I reset back to the ICE branch. Everything is in one file. The features no longer matter, as I stripped away all cfgs.

[RustyYato]

When I say, anything, I mean

• types
• functions
• attributes
• use statements
• associated constants

even if they are unused

[istankovic]

This is no longer reproducible with 1.75.0-nightly so I think we can close this.