Compiling -> "thread 'coordinator' panicked"

[Andy-anyware]

Code

Just the whole project. if needed i can share but no idea where the bug is.

Meta

rustc --version --verbose:

rustc 1.79.0 (129f3b996 2024-06-10)
binary: rustc
commit-hash: 129f3b9964af4d4a709d1383930ade12dfe7c081
commit-date: 2024-06-10
host: x86_64-pc-windows-msvc
release: 1.79.0
LLVM version: 18.1.7

Error output

thread 'coordinator' panicked at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081\compiler\rustc_codegen_ssa\src\back\write.rs:1638:29:
/rustc/129f3b9964af4d4a709d1383930ade12dfe7c081\compiler\rustc_codegen_ssa\src\back\write.rs:1638:29: worker thread panicked     
stack backtrace:
   0:     0x7ffb57ea3c48 - std::backtrace_rs::backtrace::dbghelp64::trace
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91
   1:     0x7ffb57ea3c48 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffb57ea3c48 - std::sys_common::backtrace::_print_fmt
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\sys_common\backtrace.rs:68     
   3:     0x7ffb57ea3c48 - std::sys_common::backtrace::_print::impl$0::fmt
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\sys_common\backtrace.rs:44     
   4:     0x7ffb57ed4f09 - core::fmt::rt::Argument::fmt
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\core\src\fmt\rt.rs:165
   5:     0x7ffb57ed4f09 - core::fmt::write
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\core\src\fmt\mod.rs:1157
   6:     0x7ffb57e9a3e1 - std::io::Write::write_fmt<std::sys::pal::windows::stdio::Stderr>
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\io\mod.rs:1832
   7:     0x7ffb57ea3a26 - std::sys_common::backtrace::print
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\sys_common\backtrace.rs:34     
   8:     0x7ffb57ea6b88 - std::panicking::default_hook::closure$1
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\panicking.rs:271
   9:     0x7ffb57ea67f7 - std::panicking::default_hook
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\panicking.rs:298
  10:     0x7ffb49f9fdfe - __longjmp_internal
  11:     0x7ffb57ea71b7 - alloc::boxed::impl$50::call
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\alloc\src\boxed.rs:2036
  12:     0x7ffb57ea71b7 - std::panicking::rust_panic_with_hook
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\panicking.rs:799
  13:     0x7ffb4b100734 - ar_archive_writer[96f46fe156109c5a]::archive_writer::write_symbols
  14:     0x7ffb4b0f6029 - ar_archive_writer[96f46fe156109c5a]::archive_writer::write_symbols
  15:     0x7ffb4b0e3c13 - ar_archive_writer[96f46fe156109c5a]::archive_writer::write_symbols
  16:     0x7ffb4b195c6d - rustc_middle[9a5583d0f984d223]::util::bug::bug_fmt
  17:     0x7ffb4b1767bd - rustc_middle[9a5583d0f984d223]::ty::consts::const_param_default
  18:     0x7ffb4b1765fd - rustc_middle[9a5583d0f984d223]::ty::consts::const_param_default
  19:     0x7ffb4b195ba2 - rustc_middle[9a5583d0f984d223]::util::bug::bug_fmt
  20:     0x7ffb48d153a6 - <rustc_interface[5039fedd6fed528e]::passes::LintStoreExpandImpl as rustc_expand[8a362ccb6e11b5d0]::base::LintStoreExpand>::pre_expansion_lint
  21:     0x7ffb45d79bfb - llvm::DenseMap<llvm::StructType * __ptr64,llvm::detail::DenseSetEmpty,llvm::IRMover::StructTypeKeyInfo,llvm::detail::DenseSetPair<llvm::StructType * __ptr64> >::~DenseMap<llvm::StructType * __ptr64,llvm::detail::DenseSetEmpty,llvm::IRMover::StructTypeKeyI
  22:     0x7ffb45d8568d - llvm::DenseMap<llvm::StructType * __ptr64,llvm::detail::DenseSetEmpty,llvm::IRMover::StructTypeKeyInfo,llvm::detail::DenseSetPair<llvm::StructType * __ptr64> >::~DenseMap<llvm::StructType * __ptr64,llvm::detail::DenseSetEmpty,llvm::IRMover::StructTypeKeyI
  23:     0x7ffb57eb822d - alloc::boxed::impl$48::call_once
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\alloc\src\boxed.rs:2022
  24:     0x7ffb57eb822d - alloc::boxed::impl$48::call_once
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\alloc\src\boxed.rs:2022
  25:     0x7ffb57eb822d - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library\std\src\sys\pal\windows\thread.rs:52   
  26:     0x7ffbb8b07374 - BaseThreadInitThunk
  27:     0x7ffbb965cc91 - RtlUserThreadStart

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 1.79.0 (129f3b996 2024-06-10) running on x86_64-pc-windows-msvc

note: compiler flags: --crate-type bin -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: cached cgu 58qpz0sqetpnq1gt should have an object file, but doesn't

error: could not compile `test-arca-ws` (bin "test-arca-ws") due to 1 previous error

Backtrace

running it with "RUST_BACKTRACE=1" gives exactly the same msg

[ChrisDenton]

Do you get the same error with rust 1.82?

[Andy-anyware]

Yes, but... as soon as i deleted target/ and re run cargo build (with 1.82) it worked. it seems to be my pc. not an error on rust. how can i remove this bug?

[jieyouxu]

Two questions:

1. How much disk space do you have left?
2. Is your system under additional load at the time of compilation?

[jieyouxu]

Oh right... The panic message is a bit unfortunate due to #132245 I think.

[Andy-anyware]

Two questions:

1. How much disk space do you have left?

2. Is your system under additional load at the time of compilation?

1. Less than 4gb... didn't realize that till you mention it!! SSD Western Black
2. Not really, i3-12100 and 16gb ram running just youtube and vscodium.

[ChrisDenton]

Running out of disk space would explain it. Though it would be better to have a proper error message.

[jieyouxu]

Yeah, the ICE message could be better, but this is unfortunately resource exhaustion.

[saethlin]

The error is at the bottom:

error: cached cgu 58qpz0sqetpnq1gt should have an object file, but doesn't

The reason we have a garbled diagnostic is that rustc implements fatal errors with unwinding, and cg_ssa has a highly custom thread pool implementation that thinks any thread unwinding is a panic. But in this case, it's not.

Now as to how a cached CGU ends up missing its object file, I have no idea.

See also
#120865
#132240

[saethlin]

Note I don't think this counts as generalized resource exhaustion, the incr comp system should not have finalized an incomplete session directory. It's designed to not do that. But I think this diagnostic means it did. Yeah resource exhaustion is unfixable, but we're supposed to report it, not emit an incoherent ICE or SIGBUS/SIGSEGV like LLVM does.