ICE while compiling with -Z threads=16: no ImplicitCtxt stored in tls

[RecursivePineapple]

Code

I'm unable to share a minimal verifiable example, because my project is well over 30k lines, and the problem is not caused by a singular dependency. I haven't been able to reproduce this panic, so I assume there's a timing issue somewhere in the new multithreaded frontend.

Meta

rustc --version --verbose:

rustc 1.76.0-nightly (283170175 2023-11-17)
binary: rustc
commit-hash: 2831701757eb7b3105eda26a306c2f3a97e2664b
commit-date: 2023-11-17
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

~/.cargo/config.toml

[target.x86_64-unknown-linux-gnu]
linker = "/opt/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang"
rustflags = ["-C", "link-arg=-fuse-ld=/usr/local/bin/mold", "-Zproc-macro-backtrace", "-Zthreads=16"]

Error output

thread 'rustc' panicked at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/compiler/rustc_middle/src/ty/context/tls.rs:111:50:
no ImplicitCtxt stored in tls
stack backtrace:
   0:     0x7f55b6a889b1 - std::backtrace_rs::backtrace::libunwind::trace::h483ae850edb3de16
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f55b6a889b1 - std::backtrace_rs::backtrace::trace_unsynchronized::he76ab31c56246276
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f55b6a889b1 - std::backtrace::Backtrace::create::hf889f4dd163a019c
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/backtrace.rs:331:13
   3:     0x7f55b6a88900 - std::backtrace::Backtrace::force_capture::h054d0cdba698d72b
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/backtrace.rs:313:9
   4:     0x7f55b3712bec - std[fdaad7ef90c89896]::panicking::update_hook::<alloc[b004227970b6e7b7]::boxed::Box<rustc_driver_impl[17daedf8c5568a7a]::install_ice_hook::{closure#0}>>::{closure#0}
   5:     0x7f55b6aa3a58 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h17e51abe579bd85b
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/alloc/src/boxed.rs:2021:9
   6:     0x7f55b6aa3a58 - std::panicking::rust_panic_with_hook::ha049439f228290e2
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/panicking.rs:783:13
   7:     0x7f55b6aa37ae - std::panicking::begin_panic_handler::{{closure}}::h94015db26d13be8a
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/panicking.rs:657:13
   8:     0x7f55b6aa0d66 - std::sys_common::backtrace::__rust_end_short_backtrace::hf6ab2f900cebd595
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/sys_common/backtrace.rs:170:18
   9:     0x7f55b6aa3512 - rust_begin_unwind
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/panicking.rs:645:5
  10:     0x7f55b6aeff85 - core::panicking::panic_fmt::h4abc57c479b2c5f0
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/core/src/panicking.rs:72:14
  11:     0x7f55b6aefd33 - core::panicking::panic_display::h91130a2c3d09f4fe
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/core/src/panicking.rs:177:5
  12:     0x7f55b6aefd33 - core::panicking::panic_str::hd398731a94ca8cd8
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/core/src/panicking.rs:152:5
  13:     0x7f55b6aefd33 - core::option::expect_failed::hbcbd1f7e1860f526
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/core/src/option.rs:1981:5
  14:     0x7f55b37123db - rustc_interface[6f4ac54450cab10c]::util::run_in_thread_pool_with_globals::<rustc_interface[6f4ac54450cab10c]::interface::run_compiler<core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>, rustc_driver_impl[17daedf8c5568a7a]::run_compiler::{closure#1}>::{closure#0}, core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>>::{closure#2}
  15:     0x7f55b3307d85 - <rayon_core[6a25b8e43840d6ae]::registry::WorkerThread>::wait_until_cold
  16:     0x7f55b3304953 - <rayon_core[6a25b8e43840d6ae]::registry::ThreadBuilder>::run
  17:     0x7f55b3714ae7 - <<crossbeam_utils[68810042c2943676]::thread::ScopedThreadBuilder>::spawn<<rayon_core[6a25b8e43840d6ae]::ThreadPoolBuilder>::build_scoped<rustc_interface[6f4ac54450cab10c]::util::run_in_thread_pool_with_globals<rustc_interface[6f4ac54450cab10c]::interface::run_compiler<core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>, rustc_driver_impl[17daedf8c5568a7a]::run_compiler::{closure#1}>::{closure#0}, core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[6f4ac54450cab10c]::util::run_in_thread_pool_with_globals<rustc_interface[6f4ac54450cab10c]::interface::run_compiler<core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>, rustc_driver_impl[17daedf8c5568a7a]::run_compiler::{closure#1}>::{closure#0}, core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#1}, core[d7b1c133060fc623]::result::Result<(), rustc_span[b3d67ce24f067787]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[d7b1c133060fc623]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:     0x7f55b370da3e - std[fdaad7ef90c89896]::sys_common::backtrace::__rust_begin_short_backtrace::<alloc[b004227970b6e7b7]::boxed::Box<dyn core[d7b1c133060fc623]::ops::function::FnOnce<(), Output = ()> + core[d7b1c133060fc623]::marker::Send>, ()>
  19:     0x7f55b3714773 - <<std[fdaad7ef90c89896]::thread::Builder>::spawn_unchecked_<alloc[b004227970b6e7b7]::boxed::Box<dyn core[d7b1c133060fc623]::ops::function::FnOnce<(), Output = ()> + core[d7b1c133060fc623]::marker::Send>, ()>::{closure#1} as core[d7b1c133060fc623]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  20:     0x7f55b6aad915 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h83a9e80d965766fa
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/alloc/src/boxed.rs:2007:9
  21:     0x7f55b6aad915 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf1e406043410dd12
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/alloc/src/boxed.rs:2007:9
  22:     0x7f55b6aad915 - std::sys::unix::thread::Thread::new::thread_start::h3aec058c6f8c1423
                               at /rustc/2831701757eb7b3105eda26a306c2f3a97e2664b/library/std/src/sys/unix/thread.rs:108:17
  23:     0x7f55b04076db - start_thread
                               at /build/glibc-uZu3wS/glibc-2.27/nptl/pthread_create.c:463
  24:     0x7f55b013061f - clone
                               at /build/glibc-uZu3wS/glibc-2.27/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
  25:                0x0 - <unknown>


rustc version: 1.76.0-nightly (283170175 2023-11-17)
platform: x86_64-unknown-linux-gnu

[petrochenkov]

Duplicate of #111522.