Compilation of `rkyv` (lib) is failing after upgrade to rust 1.71

[pushkar85]

error: internal compiler error: no errors encountered even though delay_span_bug issued

error: internal compiler error: broken MIR in Item(DefId(0:1705 ~ rkyv[d260]::std_impl::{impl#47}::deserialize)) (after phase change to runtime-optimized) at bb0[22]:
Field projection PlaceRef { local: _1, projection: [Deref, Field(0, RelPtr<[<T as Archive>::Archived]>)] }.1 specified type u32, but actual type is <[<T as Archive>::Archived] as ArchivePointee>::ArchivedMetadata
--> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rkyv-0.6.7/src/core_impl/mod.rs:489:9

<code>

Meta

rustc --version --verbose:

rustc 1.71.0 (8ede3aae2 2023-07-12) running on x86_64-unknown-linux-gnu

Error output

error: internal compiler error: no errors encountered even though delay_span_bug issued
error: internal compiler error: broken MIR in Item(DefId(0:1705 ~ rkyv[14fb]::std_impl::{impl#47}::deserialize)) (after phase change to runtime-optimized) at bb0[27]:
Field projection (*_19).1 specified type u32, but actual type is <[<T as Archive>::Archived] as ArchivePointee>::ArchivedMetadata
--> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rkyv-0.6.7/src/lib.rs:765:77
|
765 | ptr_meta::from_raw_parts(self.raw_ptr.as_ptr(), T::pointer_metadata(&self.metadata))
| ^^^^^^^^^^^^^^
|
= note: delayed at compiler/rustc_const_eval/src/transform/validate.rs:354:30
0: <rustc_errors::HandlerInner>::emit_diagnostic
1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
2: <rustc_const_eval::transform::validate::TypeChecker>::fail::alloc::string::String
3: <rustc_const_eval::transform::validate::TypeChecker as rustc_middle::mir::visit::Visitor>::visit_place
4: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
5: rustc_mir_transform::optimized_mir
6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
7: <rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
9: rustc_query_impl::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
10: <rustc_metadata::rmeta::encoder::EncodeContext>::encode_crate_root
11: rustc_metadata::rmeta::encoder::encode_metadata_impl
12: rustc_data_structures::sync::join::<rustc_metadata::rmeta::encoder::encode_metadata::{closure#0}, rustc_metadata::rmeta::encoder::encode_metadata::{closure#1}, (), ()>
13: rustc_metadata::rmeta::encoder::encode_metadata
14: rustc_metadata::fs::encode_and_write_metadata
15: rustc_interface::passes::start_codegen
16: <rustc_middle::ty::context::GlobalCtxt>::enter::<<rustc_interface::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core::result::Result<alloc::boxed::Box, rustc_span::ErrorGuaranteed>>
17: <rustc_interface::queries::Queries>::ongoing_codegen
18: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
19: std::sys_common::backtrace::_rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
20: <std::thread::Builder::spawn_unchecked<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
21: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce>::call_once
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/alloc/src/boxed.rs:1985:9
22: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce>::call_once
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/alloc/src/boxed.rs:1985:9
23: std::sys::unix::thread::Thread::new::thread_start
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/std/src/sys/unix/thread.rs:108:17
24: start_thread
25: __clone

error: internal compiler error: broken MIR in Item(DefId(0:1705 ~ rkyv[14fb]::std_impl::{impl#47}::deserialize)) (after phase change to runtime-optimized) at bb3[29]:
Field projection (*_37).1 specified type u32, but actual type is <[<T as Archive>::Archived] as ArchivePointee>::ArchivedMetadata
--> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rkyv-0.6.7/src/lib.rs:765:77
|
765 | ptr_meta::from_raw_parts(self.raw_ptr.as_ptr(), T::pointer_metadata(&self.metadata))
| ^^^^^^^^^^^^^^
|
= note: delayed at compiler/rustc_const_eval/src/transform/validate.rs:354:30
0: <rustc_errors::HandlerInner>::emit_diagnostic
1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
2: <rustc_const_eval::transform::validate::TypeChecker>::fail::alloc::string::String
3: <rustc_const_eval::transform::validate::TypeChecker as rustc_middle::mir::visit::Visitor>::visit_place
4: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
5: rustc_mir_transform::optimized_mir
6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
7: <rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
9: rustc_query_impl::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
10: <rustc_metadata::rmeta::encoder::EncodeContext>::encode_crate_root
11: rustc_metadata::rmeta::encoder::encode_metadata_impl
12: rustc_data_structures::sync::join::<rustc_metadata::rmeta::encoder::encode_metadata::{closure#0}, rustc_metadata::rmeta::encoder::encode_metadata::{closure#1}, (), ()>
13: rustc_metadata::rmeta::encoder::encode_metadata
14: rustc_metadata::fs::encode_and_write_metadata
15: rustc_interface::passes::start_codegen
16: <rustc_middle::ty::context::GlobalCtxt>::enter::<<rustc_interface::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core::result::Result<alloc::boxed::Box, rustc_span::ErrorGuaranteed>>
17: <rustc_interface::queries::Queries>::ongoing_codegen
18: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
19: std::sys_common::backtrace::_rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
20: <std::thread::Builder::spawn_unchecked<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
21: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce>::call_once
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/alloc/src/boxed.rs:1985:9
22: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce>::call_once
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/alloc/src/boxed.rs:1985:9
23: std::sys::unix::thread::Thread::new::thread_start
at /rustc/8ede3aae28fe6e4d52b38157d7bfe0d3bceef225/library/std/src/sys/unix/thread.rs:108:17
24: start_thread
25: __clone

<output>

Backtrace

<backtrace>
``note: rustc 1.73.0-nightly (0e8e857b1 2023-07-16) running on x86_64-unknown-linux-gnu`


</p>
</details>

[lukas-code]

duplicate of #112332

[pushkar85]

@lukas-code is there any work around , currently its completely broken

[lukas-code]

The bug seems to be fixed in rkyv 0.7, so if you can upgrade that would probably be the best solution.

Otherwise, if you're stuck with rkyv 0.6, you can hack around this by disabling the buggy optimization pass by setting these environment variables:

RUSTC_BOOTSTRAP=1 RUSTFLAGS=-Zmir-enable-passes=-Inline

(Note that this enables unstable options on the stable compiler and isn't really supported.)

[pushkar85]

Thanks a lot @lukas-code , for now it has worked

[pushkar85]

@cjgillot by when we can expect this patch to be included in rust 1.71

[pushkar85]

The bug seems to be fixed in rkyv 0.7, so if you can upgrade that would probably be the best solution.

Otherwise, if you're stuck with rkyv 0.6, you can hack around this by disabling the buggy optimization pass by setting these environment variables:

RUSTC_BOOTSTRAP=1 RUSTFLAGS=-Zmir-enable-passes=-Inline

(Note that this enables unstable options on the stable compiler and isn't really supported.)

@lukas-code This workaround does not work , when any optimisation level is set .