ICE: "no saved object file in work product" - potential incremental issue

[jamesmunns]

Code

This commit: memorysafety/river@5ff346d

Meta

This didn't seem to reproduce after a cargo clean, so I can't provide too much more wrt what caused this to happen.

So far I've only seen this once.

This was running in an aarch64 fedora VM running on an M2 Mac inside of UTM.

Error output

[Running 'cargo check && cargo test']
    Checking river v0.2.0 (/mnt/share/vmshare/contracts/isrg/river/source/river)
    Finished dev [unoptimized + debuginfo] target(s) in 0.63s
   Compiling river v0.2.0 (/mnt/share/vmshare/contracts/isrg/river/source/river)
thread 'cpy 1ukymu2hvb0r0otf' panicked at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/compiler/rustc_codegen_ssa/src/back/write.rs:917:44:
no saved object file in work product
stack backtrace:
   0:     0xffffab7439ec - std::backtrace_rs::backtrace::libunwind::trace::ha909211bcabbe3ac
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0xffffab7439ec - std::backtrace_rs::backtrace::trace_unsynchronized::h8f4bf76df48e0fca
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0xffffab7439ec - std::sys_common::backtrace::_print_fmt::h7a880f791e80e899
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:68:5
   3:     0xffffab7439ec - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h435dc28c83034320
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:44:22
   4:     0xffffab78d1e8 - core::fmt::rt::Argument::fmt::h22144fbf1e72c1e0
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/rt.rs:142:9
   5:     0xffffab78d1e8 - core::fmt::write::hd8738e3694a112d7
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/mod.rs:1120:17
   6:     0xffffab73944c - std::io::Write::write_fmt::h436b94c6697db76d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/io/mod.rs:1846:15
   7:     0xffffab743818 - std::sys_common::backtrace::_print::ha54e28ed84d016bd
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:47:5
   8:     0xffffab743818 - std::sys_common::backtrace::print::h53c5489f7bece51d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:34:9
   9:     0xffffab746284 - std::panicking::default_hook::{{closure}}::h0cf4d4378fa545a3
  10:     0xffffab745fb8 - std::panicking::default_hook::h083086c8c3d6f7ab
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:292:9
  11:     0xffffac2973f8 - <alloc[f06ece74a4fc239f]::boxed::Box<rustc_driver_impl[acc3693e9fb6d00]::install_ice_hook::{closure#0}> as core[78d0b6180d7076d4]::ops::function::Fn<(&dyn for<'a, 'b> core[78d0b6180d7076d4]::ops::function::Fn<(&'a core[78d0b6180d7076d4]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[78d0b6180d7076d4]::marker::Sync + core[78d0b6180d7076d4]::marker::Send, &core[78d0b6180d7076d4]::panic::panic_info::PanicInfo)>>::call
  12:     0xffffab74696c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hf2edefd0c36edede
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2029:9
  13:     0xffffab74696c - std::panicking::rust_panic_with_hook::h7eda7902743f1889
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:785:13
  14:     0xffffab7466e8 - std::panicking::begin_panic_handler::{{closure}}::h9e0c8c22f2412703
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:659:13
  15:     0xffffab743ebc - std::sys_common::backtrace::__rust_end_short_backtrace::ha7fb929dac979860
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:171:18
  16:     0xffffab746488 - rust_begin_unwind
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:647:5
  17:     0xffffab7114bc - core::panicking::panic_fmt::hbb22b1130d3a7f38
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/panicking.rs:72:14
  18:     0xffffab71148c - core::panicking::panic_display::hc01b522008d00daf
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/panicking.rs:196:5
  19:     0xffffab71148c - core::panicking::panic_str::h887dc2e6a7ca69c2
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/panicking.rs:171:5
  20:     0xffffab71148c - core::option::expect_failed::h5639e0be8ab85f68
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/option.rs:1988:5
  21:     0xffffac5042fc - rustc_codegen_ssa[79a1e11a865bc274]::back::write::execute_copy_from_cache_work_item::<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>
  22:     0xffffac5ad004 - std[67261b68e235c13b]::sys_common::backtrace::__rust_begin_short_backtrace::<<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend as rustc_codegen_ssa[79a1e11a865bc274]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[79a1e11a865bc274]::back::write::spawn_work<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>::{closure#0}, ()>::{closure#0}, ()>
  23:     0xffffac505fec - <<std[67261b68e235c13b]::thread::Builder>::spawn_unchecked_<<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend as rustc_codegen_ssa[79a1e11a865bc274]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[79a1e11a865bc274]::back::write::spawn_work<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>::{closure#0}, ()>::{closure#0}, ()>::{closure#1} as core[78d0b6180d7076d4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  24:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h99a8d905b3363c45
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  25:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdc482d37839e1180
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  26:     0xffffab74f3b4 - std::sys::pal::unix::thread::Thread::new::thread_start::he6d6f33e3183ae4d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys/pal/unix/thread.rs:108:17
  27:     0xffffab590584 - start_thread
  28:     0xffffab5ffd4c - thread_start
  29:                0x0 - <unknown>

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 1.77.0 (aedd173a2 2024-03-17) running on aarch64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

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

query stack during panic:
end of query stack
thread 'coordinator' panicked at compiler/rustc_middle/src/util/bug.rs:36:26:
/rustc/aedd173a2c086e558c2b66d3743b344f977621a7/compiler/rustc_codegen_ssa/src/back/write.rs:1588:29: worker thread panicked
stack backtrace:
   0:     0xffffab7439ec - std::backtrace_rs::backtrace::libunwind::trace::ha909211bcabbe3ac
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0xffffab7439ec - std::backtrace_rs::backtrace::trace_unsynchronized::h8f4bf76df48e0fca
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0xffffab7439ec - std::sys_common::backtrace::_print_fmt::h7a880f791e80e899
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:68:5
   3:     0xffffab7439ec - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h435dc28c83034320
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:44:22
   4:     0xffffab78d1e8 - core::fmt::rt::Argument::fmt::h22144fbf1e72c1e0
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/rt.rs:142:9
   5:     0xffffab78d1e8 - core::fmt::write::hd8738e3694a112d7
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/mod.rs:1120:17
   6:     0xffffab73944c - std::io::Write::write_fmt::h436b94c6697db76d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/io/mod.rs:1846:15
   7:     0xffffab743818 - std::sys_common::backtrace::_print::ha54e28ed84d016bd
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:47:5
   8:     0xffffab743818 - std::sys_common::backtrace::print::h53c5489f7bece51d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:34:9
   9:     0xffffab746284 - std::panicking::default_hook::{{closure}}::h0cf4d4378fa545a3
  10:     0xffffab745fb8 - std::panicking::default_hook::h083086c8c3d6f7ab
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:292:9
  11:     0xffffac2973f8 - <alloc[f06ece74a4fc239f]::boxed::Box<rustc_driver_impl[acc3693e9fb6d00]::install_ice_hook::{closure#0}> as core[78d0b6180d7076d4]::ops::function::Fn<(&dyn for<'a, 'b> core[78d0b6180d7076d4]::ops::function::Fn<(&'a core[78d0b6180d7076d4]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[78d0b6180d7076d4]::marker::Sync + core[78d0b6180d7076d4]::marker::Send, &core[78d0b6180d7076d4]::panic::panic_info::PanicInfo)>>::call
  12:     0xffffab74696c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hf2edefd0c36edede
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2029:9
  13:     0xffffab74696c - std::panicking::rust_panic_with_hook::h7eda7902743f1889
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:785:13
  14:     0xffffb0f945c0 - std[67261b68e235c13b]::panicking::begin_panic::<alloc[f06ece74a4fc239f]::string::String>::{closure#0}
  15:     0xffffb0f94274 - std[67261b68e235c13b]::sys_common::backtrace::__rust_end_short_backtrace::<std[67261b68e235c13b]::panicking::begin_panic<alloc[f06ece74a4fc239f]::string::String>::{closure#0}, !>
  16:     0xffffac1a7bcc - std[67261b68e235c13b]::panicking::begin_panic::<alloc[f06ece74a4fc239f]::string::String>
  17:     0xffffb1004b8c - rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt::<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}
  18:     0xffffb1002bf4 - rustc_middle[a0df8d032def7fe]::ty::context::tls::with_opt::<rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  19:     0xffffb1002bc4 - rustc_middle[a0df8d032def7fe]::ty::context::tls::with_context_opt::<rustc_middle[a0df8d032def7fe]::ty::context::tls::with_opt<rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  20:     0xffffac1a02f8 - rustc_middle[a0df8d032def7fe]::util::bug::bug_fmt
  21:     0xffffac5aeec4 - std[67261b68e235c13b]::sys_common::backtrace::__rust_begin_short_backtrace::<<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend as rustc_codegen_ssa[79a1e11a865bc274]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[79a1e11a865bc274]::back::write::start_executing_work<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>::{closure#5}, core[78d0b6180d7076d4]::result::Result<rustc_codegen_ssa[79a1e11a865bc274]::back::write::CompiledModules, ()>>::{closure#0}, core[78d0b6180d7076d4]::result::Result<rustc_codegen_ssa[79a1e11a865bc274]::back::write::CompiledModules, ()>>
  22:     0xffffac5062c8 - <<std[67261b68e235c13b]::thread::Builder>::spawn_unchecked_<<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend as rustc_codegen_ssa[79a1e11a865bc274]::traits::backend::ExtraBackendMethods>::spawn_named_thread<rustc_codegen_ssa[79a1e11a865bc274]::back::write::start_executing_work<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>::{closure#5}, core[78d0b6180d7076d4]::result::Result<rustc_codegen_ssa[79a1e11a865bc274]::back::write::CompiledModules, ()>>::{closure#0}, core[78d0b6180d7076d4]::result::Result<rustc_codegen_ssa[79a1e11a865bc274]::back::write::CompiledModules, ()>>::{closure#1} as core[78d0b6180d7076d4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  23:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h99a8d905b3363c45
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  24:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdc482d37839e1180
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  25:     0xffffab74f3b4 - std::sys::pal::unix::thread::Thread::new::thread_start::he6d6f33e3183ae4d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys/pal/unix/thread.rs:108:17
  26:     0xffffab590584 - start_thread
  27:     0xffffab5ffd4c - thread_start
  28:                0x0 - <unknown>

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 1.77.0 (aedd173a2 2024-03-17) running on aarch64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

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

query stack during panic:
end of query stack
thread 'rustc' panicked at compiler/rustc_middle/src/util/bug.rs:36:26:
/rustc/aedd173a2c086e558c2b66d3743b344f977621a7/compiler/rustc_codegen_ssa/src/back/write.rs:1956:17: panic during codegen/LLVM phase
stack backtrace:
   0:     0xffffab7439ec - std::backtrace_rs::backtrace::libunwind::trace::ha909211bcabbe3ac
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0xffffab7439ec - std::backtrace_rs::backtrace::trace_unsynchronized::h8f4bf76df48e0fca
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0xffffab7439ec - std::sys_common::backtrace::_print_fmt::h7a880f791e80e899
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:68:5
   3:     0xffffab7439ec - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h435dc28c83034320
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:44:22
   4:     0xffffab78d1e8 - core::fmt::rt::Argument::fmt::h22144fbf1e72c1e0
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/rt.rs:142:9
   5:     0xffffab78d1e8 - core::fmt::write::hd8738e3694a112d7
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/core/src/fmt/mod.rs:1120:17
   6:     0xffffab73944c - std::io::Write::write_fmt::h436b94c6697db76d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/io/mod.rs:1846:15
   7:     0xffffab743818 - std::sys_common::backtrace::_print::ha54e28ed84d016bd
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:47:5
   8:     0xffffab743818 - std::sys_common::backtrace::print::h53c5489f7bece51d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys_common/backtrace.rs:34:9
   9:     0xffffab746284 - std::panicking::default_hook::{{closure}}::h0cf4d4378fa545a3
  10:     0xffffab745fb8 - std::panicking::default_hook::h083086c8c3d6f7ab
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:292:9
  11:     0xffffac2973f8 - <alloc[f06ece74a4fc239f]::boxed::Box<rustc_driver_impl[acc3693e9fb6d00]::install_ice_hook::{closure#0}> as core[78d0b6180d7076d4]::ops::function::Fn<(&dyn for<'a, 'b> core[78d0b6180d7076d4]::ops::function::Fn<(&'a core[78d0b6180d7076d4]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[78d0b6180d7076d4]::marker::Sync + core[78d0b6180d7076d4]::marker::Send, &core[78d0b6180d7076d4]::panic::panic_info::PanicInfo)>>::call
  12:     0xffffab74696c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hf2edefd0c36edede
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2029:9
  13:     0xffffab74696c - std::panicking::rust_panic_with_hook::h7eda7902743f1889
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/panicking.rs:785:13
  14:     0xffffb0f945c0 - std[67261b68e235c13b]::panicking::begin_panic::<alloc[f06ece74a4fc239f]::string::String>::{closure#0}
  15:     0xffffb0f94274 - std[67261b68e235c13b]::sys_common::backtrace::__rust_end_short_backtrace::<std[67261b68e235c13b]::panicking::begin_panic<alloc[f06ece74a4fc239f]::string::String>::{closure#0}, !>
  16:     0xffffac1a7bcc - std[67261b68e235c13b]::panicking::begin_panic::<alloc[f06ece74a4fc239f]::string::String>
  17:     0xffffb1004b8c - rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt::<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}
  18:     0xffffb1002bf4 - rustc_middle[a0df8d032def7fe]::ty::context::tls::with_opt::<rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  19:     0xffffb1002bc4 - rustc_middle[a0df8d032def7fe]::ty::context::tls::with_context_opt::<rustc_middle[a0df8d032def7fe]::ty::context::tls::with_opt<rustc_middle[a0df8d032def7fe]::util::bug::opt_span_bug_fmt<rustc_span[a3ab065b480aa793]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  20:     0xffffac1a02f8 - rustc_middle[a0df8d032def7fe]::util::bug::bug_fmt
  21:     0xffffac5089d0 - <rustc_codegen_ssa[79a1e11a865bc274]::back::write::OngoingCodegen<rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend>>::join
  22:     0xffffac5bcff8 - <rustc_codegen_llvm[1c89da6189bdcd79]::LlvmCodegenBackend as rustc_codegen_ssa[79a1e11a865bc274]::traits::backend::CodegenBackend>::join_codegen
  23:     0xffffac49d394 - <rustc_interface[735d705be2a4b8df]::queries::Linker>::link
  24:     0xffffac2caed8 - rustc_interface[735d705be2a4b8df]::util::run_in_thread_with_globals::<rustc_interface[735d705be2a4b8df]::interface::run_compiler<core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>, rustc_driver_impl[acc3693e9fb6d00]::run_compiler::{closure#0}>::{closure#0}, core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>>::{closure#0}::{closure#0}
  25:     0xffffac2c9448 - std[67261b68e235c13b]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[735d705be2a4b8df]::util::run_in_thread_with_globals<rustc_interface[735d705be2a4b8df]::interface::run_compiler<core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>, rustc_driver_impl[acc3693e9fb6d00]::run_compiler::{closure#0}>::{closure#0}, core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>>
  26:     0xffffac2cc1d0 - <<std[67261b68e235c13b]::thread::Builder>::spawn_unchecked_<rustc_interface[735d705be2a4b8df]::util::run_in_thread_with_globals<rustc_interface[735d705be2a4b8df]::interface::run_compiler<core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>, rustc_driver_impl[acc3693e9fb6d00]::run_compiler::{closure#0}>::{closure#0}, core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[78d0b6180d7076d4]::result::Result<(), rustc_span[a3ab065b480aa793]::ErrorGuaranteed>>::{closure#1} as core[78d0b6180d7076d4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  27:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h99a8d905b3363c45
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  28:     0xffffab74f3b4 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdc482d37839e1180
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/alloc/src/boxed.rs:2015:9
  29:     0xffffab74f3b4 - std::sys::pal::unix::thread::Thread::new::thread_start::he6d6f33e3183ae4d
                               at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/library/std/src/sys/pal/unix/thread.rs:108:17
  30:     0xffffab590584 - start_thread
  31:     0xffffab5ffd4c - thread_start
  32:                0x0 - <unknown>

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 1.77.0 (aedd173a2 2024-03-17) running on aarch64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

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

query stack during panic:
end of query stack
error: could not compile `river` (bin "river" test)
[Finished running. Exit status: 101]

[jamesmunns]

Maybe a dupe of #109879 - tho this is on Linux instead of Windows, and at a different worker stage (not LTO).

[jamesmunns]

I did have this happen again, though it is very rare. One potential note is that it seems to occur when I am using cargo watch, and I hit save multiple times quickly.

It's possible what is happening is:

• Some sort of incremental compilation happens, and SOME work products are written, but others aren't
• the process is killed because cargo watch notices a new save was made
• the next compilation fails because it things something (???) should exist on disk, but doesn't (or is incomplete) due to the process being killed

Does incremental compilation have any notion of "transactions"? e.g. what if the compilation is killed?

[jamesmunns]

In the run BEFORE the error occurred, I did get this warning:

warning: variable does not need to be mutable
  --> src/main.rs:23:13
   |
23 |         let mut listeners = Listeners::new();
   |             ----^^^^^^^^^
   |             |
   |             help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: error copying object file `/mnt/share/vmshare/contracts/isrg/river/source/river/target/debug/deps/river-f96f9f6f9262ae0d.26wqoch9hrpxldmx.rcgu.o` to incremental directory as `/mnt/share/vmshare/contracts/isrg/river/source/river/target/debug/incremental/river-1mpzbb0wp27rk/s-guwsu8i3hc-1glc1l2-working/26wqoch9hrpxldmx.o`: No such file or directory (os error 2)

[Running 'cargo check && cargo test && cargo run -- --config-toml ./assets/test-config.toml']                                
    Checking river v0.2.0 (/mnt/share/vmshare/contracts/isrg/river/source/river)
warning: unused variable: `listeners`
  --> src/main.rs:23:17
   |
23 |         let mut listeners = Listeners::new();
   |                 ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_listeners`
   |

in the subsequent error:

thread 'cpy 26wqoch9hrpxldmx' panicked at /rustc/aedd173a2c086e558c2b66d3743b344f977621a7/compiler/rustc_codegen_ssa/src/back/write.rs:917:44:
no saved object file in work product
stack backtrace:
   0:     0xffff7fd439ec - std::backtrace_rs::backtrace::libunwind::trace::ha909211bcabbe3ac

[saethlin]

I did have this happen again, though it is very rare. One potential note is that it seems to occur when I am using cargo watch, and I hit save multiple times quickly.

This is great info. Maybe I can craft another test harness that provokes this crash.

[saethlin]

Does incremental compilation have any notion of "transactions"? e.g. what if the compilation is killed?

To be clear: There is supposed to be a mechanism to prevent the scenario you're reporting here. We write all our output to a staging directory then fs::rename the staging directory to the name that the next compilation is actually going to look for. The implementation was designed with this "what if the compiler is killed?" scenario in mind. It's probably just buggy.

[jamesmunns]

Also potentially worth mentioning: I'm using a VM with a shared folder for this, with:

• The host has an editor open, running Rust Analyzer
• The client VM is running cargo watch

IMO it shouldn't be THAT different than having an IDE with R-A and running cargo-watch at the same time, but just wanted to note.

[saethlin]

VM with a shared folder

Hmmmmmmmmmmmmmmmmmmmmmmm

rust/compiler/rustc_incremental/src/persist/fs.rs

Lines 94 to 104 in 4fd4797

	//! This system relies on two features being available in the file system in
	//! order to work really well: file locking and hard linking.
	//! If hard linking is not available (like on FAT) the data in the cache
	//! actually has to be copied at the beginning of each session.
	//! If file locking does not work reliably (like on NFS), some of the
	//! synchronization will go haywire.
	//! In both cases we recommend to locate the incremental compilation directory
	//! on a file system that supports these things.
	//! It might be a good idea though to try and detect whether we are on an
	//! unsupported file system and emit a warning in that case. This is not yet
	//! implemented.