trait_impls_of does not have an unique index (DepKind variant: 166)

[kornelski]

I occasionally get a corrupted target directory:

thread 'rustc' panicked at /rustc/920d95eaf23d7eb6b415d09868e4f793024fa604/compiler/rustc_query_system/src/dep_graph/serialized.rs:260:21:
Error: A dep graph node (trait_impls_of) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 166 }(edc9942d4bc9e683-29b7d5f0f789d82)
stack backtrace:
   0:        0x1108599e4 - std::backtrace::Backtrace::create::h23b6908fc40e125e
   1:        0x10ea09454 - std[54631d7a81de9e90]::panicking::update_hook::<alloc[898041eeb075be66]::boxed::Box<rustc_driver_impl[cbe3ee50a9b64982]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x11087499c - std::panicking::rust_panic_with_hook::h6e33d145b73c56b6
   3:        0x110874590 - std::panicking::begin_panic_handler::{{closure}}::h1b530e3befd00369
   4:        0x110871f80 - std::sys::backtrace::__rust_end_short_backtrace::h08b2dd416eec9a36
   5:        0x110874258 - __rustc[30d06caa1ba95d]::rust_begin_unwind
   6:        0x1134cd77c - core::panicking::panic_fmt::ha09de3336dfd93b2
   7:        0x10f1669ec - rustc_incremental[b6678e5139e06e3a]::persist::load::setup_dep_graph
   8:        0x10e9b51b8 - rustc_interface[21db00968683b297]::passes::create_and_enter_global_ctxt::<core[edc9942d4bc9e683]::option::Option<rustc_interface[21db00968683b297]::queries::Linker>, rustc_driver_impl[cbe3ee50a9b64982]::run_compiler::{closure#0}::{closure#2}>
   9:        0x10ea06098 - rustc_interface[21db00968683b297]::interface::run_compiler::<(), rustc_driver_impl[cbe3ee50a9b64982]::run_compiler::{closure#0}>::{closure#1}
  10:        0x10ea2f4d4 - <rayon_core[ea3f96dfc7cd810e]::job::StackJob<rayon_core[ea3f96dfc7cd810e]::latch::LatchRef<rayon_core[ea3f96dfc7cd810e]::latch::LockLatch>, <rayon_core[ea3f96dfc7cd810e]::registry::Registry>::in_worker_cold<<rayon_core[ea3f96dfc7cd810e]::thread_pool::ThreadPool>::install<rustc_interface[21db00968683b297]::util::run_in_thread_pool_with_globals<rustc_interface[21db00968683b297]::interface::run_compiler<(), rustc_driver_impl[cbe3ee50a9b64982]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[ea3f96dfc7cd810e]::job::Job>::execute
  11:        0x1134df5c4 - <rayon_core[ea3f96dfc7cd810e]::registry::WorkerThread>::wait_until_cold
  12:        0x10e0738d8 - <rayon_core[ea3f96dfc7cd810e]::registry::ThreadBuilder>::run
  13:        0x10ea0d4e4 - <<crossbeam_utils[32e36cdb49266747]::thread::ScopedThreadBuilder>::spawn<<rayon_core[ea3f96dfc7cd810e]::ThreadPoolBuilder>::build_scoped<rustc_interface[21db00968683b297]::util::run_in_thread_pool_with_globals<rustc_interface[21db00968683b297]::interface::run_compiler<(), rustc_driver_impl[cbe3ee50a9b64982]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[21db00968683b297]::util::run_in_thread_pool_with_globals<rustc_interface[21db00968683b297]::interface::run_compiler<(), rustc_driver_impl[cbe3ee50a9b64982]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[edc9942d4bc9e683]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  14:        0x10e9f6270 - std[54631d7a81de9e90]::sys::backtrace::__rust_begin_short_backtrace::<alloc[898041eeb075be66]::boxed::Box<dyn core[edc9942d4bc9e683]::ops::function::FnOnce<(), Output = ()> + core[edc9942d4bc9e683]::marker::Send>, ()>
  15:        0x10ea0c534 - <<std[54631d7a81de9e90]::thread::Builder>::spawn_unchecked_<alloc[898041eeb075be66]::boxed::Box<dyn core[edc9942d4bc9e683]::ops::function::FnOnce<(), Output = ()> + core[edc9942d4bc9e683]::marker::Send>, ()>::{closure#1} as core[edc9942d4bc9e683]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:        0x110878a30 - std::sys::pal::unix::thread::Thread::new::thread_start::hc32cbdf418fc6461
  17:        0x1805e5c0c - __pthread_cond_wait


rustc version: 1.87.0-nightly (920d95eaf 2025-03-28)
platform: aarch64-apple-darwin

compiler flags: --crate-type lib -C opt-level=1 -C embed-bitcode=no -C debuginfo=line-tables-only -C split-debuginfo=unpacked -C debug-assertions=on -C incremental=[REDACTED] -Z incremental-verify-ich

I have -Zincremental-verify-ich set, but it doesn't seem to change anything.

[chrisp60]

A workaround

[build]
incremental = false

in a cargo config file (.cargo/config.toml) seems to have stopped the ICE AFAICT. Obviously you lose the incremental compiles with this and YMMV.

ICE

I get two flavors of ICE on

rustc version: 1.88.0-nightly (fedf10752 2025-03-30)
platform: x86_64-unknown-linux-gnu

These may be the same thing but I don't know enough about the compiler to know.

(typeck)

thread 'rustc' panicked at /rustc/fedf10752b973d83f3f7c0f819b2659c21a634de/compiler/rustc_query_system/src/dep_graph/serialized.rs:260:21:
Error: A dep graph node (typeck) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 115 }(4b585227064a590f-bca258bdd40b4fe2)
stack backtrace:
   0:     0x7fbe668bf965 - std::backtrace::Backtrace::create::hae8cd07af8e3eb50
   1:     0x7fbe64c670d5 - std::backtrace::Backtrace::force_capture::h9e9cd991c43af287
   2:     0x7fbe63ce9165 - std[bdc4cefc0c032e43]::panicking::update_hook::<alloc[a4260201fb21f0fa]::boxed::Box<rustc_driver_impl[a82370bbe3079b02]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x7fbe64c80953 - std::panicking::rust_panic_with_hook::hfdc1820ccce7abc1
   4:     0x7fbe64c8064a - std::panicking::begin_panic_handler::{{closure}}::ha3c57f7f9cd4a645
   5:     0x7fbe64c7cc59 - std::sys::backtrace::__rust_end_short_backtrace::h62980f074dfdc3c0
   6:     0x7fbe64c8030d - __rustc[4b29ef8afbe75c0e]::rust_begin_unwind
   7:     0x7fbe61694070 - core::panicking::panic_fmt::ha1280724b00965e5
   8:     0x7fbe6655eb4c - rustc_incremental[62a4779807b35765]::persist::load::setup_dep_graph
   9:     0x7fbe6652e6cd - rustc_interface[4b6516d07ac6860f]::interface::run_compiler::<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}
  10:     0x7fbe63cfff7b - <rayon_core[fc32e3c5f2258128]::job::StackJob<rayon_core[fc32e3c5f2258128]::latch::LatchRef<rayon_core[fc32e3c5f2258128]::latch::LockLatch>, <rayon_core[fc32e3c5f2258128]::registry::Registry>::in_worker_cold<<rayon_core[fc32e3c5f2258128]::thread_pool::ThreadPool>::install<rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[fc32e3c5f2258128]::job::Job>::execute
  11:     0x7fbe637c232e - <rayon_core[fc32e3c5f2258128]::registry::WorkerThread>::wait_until_cold
  12:     0x7fbe637bfc3b - <rayon_core[fc32e3c5f2258128]::registry::ThreadBuilder>::run
  13:     0x7fbe63cf066a - <<crossbeam_utils[2aaef6c0d3fef0ac]::thread::ScopedThreadBuilder>::spawn<<rayon_core[fc32e3c5f2258128]::ThreadPoolBuilder>::build_scoped<rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[e80f784d23167c2e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  14:     0x7fbe63cddf8e - std[bdc4cefc0c032e43]::sys::backtrace::__rust_begin_short_backtrace::<alloc[a4260201fb21f0fa]::boxed::Box<dyn core[e80f784d23167c2e]::ops::function::FnOnce<(), Output = ()> + core[e80f784d23167c2e]::marker::Send>, ()>
  15:     0x7fbe63cf012a - <<std[bdc4cefc0c032e43]::thread::Builder>::spawn_unchecked_<alloc[a4260201fb21f0fa]::boxed::Box<dyn core[e80f784d23167c2e]::ops::function::FnOnce<(), Output = ()> + core[e80f784d23167c2e]::marker::Send>, ()>::{closure#1} as core[e80f784d23167c2e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:     0x7fbe66389937 - std::sys::pal::unix::thread::Thread::new::thread_start::h36ad1309f224e2da
  17:     0x7fbe6026bac3 - <unknown>
  18:     0x7fbe602fd850 - <unknown>
  19:                0x0 - <unknown>


rustc version: 1.88.0-nightly (fedf10752 2025-03-30)
platform: x86_64-unknown-linux-gnu

(trait_impls_of)

thread 'rustc' panicked at /rustc/fedf10752b973d83f3f7c0f819b2659c21a634de/compiler/rustc_query_system/src/dep_graph/serialized.rs:260:21:
Error: A dep graph node (trait_impls_of) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 166 }(e80f784d23167c2e-a2cbb16cbd8c89e8)
stack backtrace:
   0:     0x7ff68f8bf965 - std::backtrace::Backtrace::create::hae8cd07af8e3eb50
   1:     0x7ff68dc670d5 - std::backtrace::Backtrace::force_capture::h9e9cd991c43af287
   2:     0x7ff68cce9165 - std[bdc4cefc0c032e43]::panicking::update_hook::<alloc[a4260201fb21f0fa]::boxed::Box<rustc_driver_impl[a82370bbe3079b02]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x7ff68dc80953 - std::panicking::rust_panic_with_hook::hfdc1820ccce7abc1
   4:     0x7ff68dc8064a - std::panicking::begin_panic_handler::{{closure}}::ha3c57f7f9cd4a645
   5:     0x7ff68dc7cc59 - std::sys::backtrace::__rust_end_short_backtrace::h62980f074dfdc3c0
   6:     0x7ff68dc8030d - __rustc[4b29ef8afbe75c0e]::rust_begin_unwind
   7:     0x7ff68a694070 - core::panicking::panic_fmt::ha1280724b00965e5
   8:     0x7ff68f55eb4c - rustc_incremental[62a4779807b35765]::persist::load::setup_dep_graph
   9:     0x7ff68f52e6cd - rustc_interface[4b6516d07ac6860f]::interface::run_compiler::<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}
  10:     0x7ff68ccfff7b - <rayon_core[fc32e3c5f2258128]::job::StackJob<rayon_core[fc32e3c5f2258128]::latch::LatchRef<rayon_core[fc32e3c5f2258128]::latch::LockLatch>, <rayon_core[fc32e3c5f2258128]::registry::Registry>::in_worker_cold<<rayon_core[fc32e3c5f2258128]::thread_pool::ThreadPool>::install<rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[fc32e3c5f2258128]::job::Job>::execute
  11:     0x7ff68c7c232e - <rayon_core[fc32e3c5f2258128]::registry::WorkerThread>::wait_until_cold
  12:     0x7ff68c7bfc3b - <rayon_core[fc32e3c5f2258128]::registry::ThreadBuilder>::run
  13:     0x7ff68ccf066a - <<crossbeam_utils[2aaef6c0d3fef0ac]::thread::ScopedThreadBuilder>::spawn<<rayon_core[fc32e3c5f2258128]::ThreadPoolBuilder>::build_scoped<rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[4b6516d07ac6860f]::util::run_in_thread_pool_with_globals<rustc_interface[4b6516d07ac6860f]::interface::run_compiler<(), rustc_driver_impl[a82370bbe3079b02]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[e80f784d23167c2e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  14:     0x7ff68ccddf8e - std[bdc4cefc0c032e43]::sys::backtrace::__rust_begin_short_backtrace::<alloc[a4260201fb21f0fa]::boxed::Box<dyn core[e80f784d23167c2e]::ops::function::FnOnce<(), Output = ()> + core[e80f784d23167c2e]::marker::Send>, ()>
  15:     0x7ff68ccf012a - <<std[bdc4cefc0c032e43]::thread::Builder>::spawn_unchecked_<alloc[a4260201fb21f0fa]::boxed::Box<dyn core[e80f784d23167c2e]::ops::function::FnOnce<(), Output = ()> + core[e80f784d23167c2e]::marker::Send>, ()>::{closure#1} as core[e80f784d23167c2e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:     0x7ff68f389937 - std::sys::pal::unix::thread::Thread::new::thread_start::h36ad1309f224e2da
  17:     0x7ff68926bac3 - <unknown>
  18:     0x7ff6892fd850 - <unknown>
  19:                0x0 - <unknown>


rustc version: 1.88.0-nightly (fedf10752 2025-03-30)
platform: x86_64-unknown-linux-gnu

[tmstorey]

I've been getting a similar error on Windows x64:

thread 'rustc' panicked at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55\compiler\rustc_query_system\src\dep_graph\serialized.rs:260:21:
Error: A dep graph node (trait_impls_of) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 166 }(6951cc9ce47704a6-3723e95b5d4c7895)
stack backtrace:
   0:     0x7ff83936446e - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ff83936446e - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff83936446e - std::backtrace::Backtrace::create
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\backtrace.rs:331
   3:     0x7ff8393643aa - std::backtrace::Backtrace::force_capture
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\backtrace.rs:312
   4:     0x7ff83aa50b36 - core[6951cc9ce47704a6]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize), <((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize) as core[6951cc9ce47704a6]::cmp::PartialOrd>::lt>
   5:     0x7ff839381e6e - std::panicking::rust_panic_with_hook
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\panicking.rs:841
   6:     0x7ff839381bc9 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\panicking.rs:706
   7:     0x7ff83937db4f - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\sys\backtrace.rs:168
   8:     0x7ff8393817ce - std::panicking::begin_panic_handler
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\panicking.rs:697
   9:     0x7ff83c4743d1 - core::panicking::panic_fmt
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\core\src\panicking.rs:75
  10:     0x7ff83a4b1f0a - rustc_incremental[b7595be64ccdf815]::persist::load::setup_dep_graph
  11:     0x7ff835cb29f1 - RINvNtNtCselrSTJIniB3_3std3sys9backtrace28___rust_begin_short_backtraceNCNCNCINvMNtB6_6threadNtB1h_7Builder16spawn_unchecked_INtNtCsgCoHrkcJ3cc_5alloc5boxed3BoxDINtNtNtCs92C1Pe9IPd2_4core3ops8function6FnOnceuEp6OutputuNtNtB2G_6marker4SendEL_EuEs_000uECshzA
  12:     0x7ff83aa6ac3d - <tracing_subscriber[2e6612e46ceaac8c]::util::TryInitError as core[6951cc9ce47704a6]::fmt::Display>::fmt
  13:     0x7ff83c4574d7 - <rayon_core[98aefc99d1ce6059]::registry::WorkerThread>::wait_until_cold
  14:     0x7ff83c453f3c - <rayon_core[98aefc99d1ce6059]::registry::ThreadBuilder>::run
  15:     0x7ff83aa57c81 - core[6951cc9ce47704a6]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize), <((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize) as core[6951cc9ce47704a6]::cmp::PartialOrd>::lt>
  16:     0x7ff83aa43bfd - std[a718a81f2920886b]::sys::backtrace::__rust_begin_short_backtrace::<alloc[c1935ac82f55411a]::boxed::Box<dyn core[6951cc9ce47704a6]::ops::function::FnOnce<(), Output = ()> + core[6951cc9ce47704a6]::marker::Send>, ()>
  17:     0x7ff83aa57493 - core[6951cc9ce47704a6]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize), <((rustc_lint_defs[1c27e9719b001612]::Level, &str), usize) as core[6951cc9ce47704a6]::cmp::PartialOrd>::lt>
  18:     0x7ff839386cad - alloc::boxed::impl$28::call_once
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\alloc\src\boxed.rs:1966
  19:     0x7ff839386cad - alloc::boxed::impl$28::call_once
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\alloc\src\boxed.rs:1966
  20:     0x7ff839386cad - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/3f5502370b8f60e4df98deba4c22ea26f4f6be55/library\std\src\sys\pal\windows\thread.rs:56
  21:     0x7ff8e9a37374 - BaseThreadInitThunk
  22:     0x7ff8eb57cc91 - RtlUserThreadStart


rustc version: 1.87.0-nightly (3f5502370 2025-03-27)
platform: x86_64-pc-windows-msvc

[compiler-errors]

cc @Zoxc #138629

[Zoxc]

Could you try having -Zincremental-verify-ich on every build after a cargo clean? That is supposed to catch this sooner.

[Zoxc]

Could you also see if it reproduces with nightly-2025-03-25 (which includes #138629 but not #138824) and this branch which just adds this check without any other recent change to the incremental system?

[chrisp60]

@Zoxc I turned on incremental compiles again for my workday, I should be able to try out various configs throughout the day as time allows.

I will start with nightly 2025-04-02, putting together any ICE that comes along, attempting to hit the versions you mentioned.

Is setting the following in my .cargo/config.toml the correct way to introduce these flags?

[build]
rustflags = [
  "-Clink-arg=-fuse-ld=mold",    # I assume unrelated
  "-Zthreads=8",                 # I assume unrelated
  "-Zincremental-verify-ich",
]
incremental = true

At least anecdotally, I don't remember seeing these issues much before nightly-2025-03-25, but I am just going off memory. I can try it out though and post back.

[jvdwrf]

For my builds, I am getting the issue with trait_impls_of very consistently when using nightly-2025-03-28 but haven't had it yet with nightly-2025-03-25.

[chrisp60]

@Zoxc Here are some results of the tests you requested

I do not know how to instruct the compiler to use a specific branch as it's toolchain. But, if it would help, I can figure it out.

AFAICT I did not see any changes from enabling the incremental-verify-ich flag, always possible that I am configuring it incorrectly though.

In summary (TLDR)

• 8ish hours of development using nightly-03-25: no ICE
• All nightly versions following: ICE almost immediately when any edits are made.

ICE (all produced similar results, regardless of nightly version or incremental-verify-ich flag).

Just putting these two here as all others were the same (except for memory addresses, versions, etc).

thread 'rustc' panicked at /rustc/d5b4c2e4f19b6d7037371cdaecc3cc2c701c68df/compiler/rustc_query_system/src/dep_graph/serialized.rs:260:21:
Error: A dep graph node (typeck) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 116 }(1d209962578a5295-cd1c7c99a4e3a42e)
stack backtrace:
   0:     0x7f257e4c2225 - std::backtrace::Backtrace::create::h4673396f9b64f746
   1:     0x7f257c857f95 - std::backtrace::Backtrace::force_capture::he5345f147017f839
   2:     0x7f257b8e981f - std[11d1cbc04f31de61]::panicking::update_hook::<alloc[b854695d616648d1]::boxed::Box<rustc_driver_impl[30725cf523bc588e]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x7f257c871a03 - std::panicking::rust_panic_with_hook::h2947a1eef4d16370
   4:     0x7f257c8716fa - std::panicking::begin_panic_handler::{{closure}}::h965a5276f65cdfd8
   5:     0x7f257c86dd19 - std::sys::backtrace::__rust_end_short_backtrace::he5ecad4245441128
   6:     0x7f257c8713bd - __rustc[d03900b93b55ae64]::rust_begin_unwind
   7:     0x7f25792a19c0 - core::panicking::panic_fmt::h185128184dece584
   8:     0x7f257e245554 - rustc_incremental[ebb4693b73fb20de]::persist::load::setup_dep_graph
   9:     0x7f257e14e4cd - rustc_interface[83a6f685120d9f35]::interface::run_compiler::<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}
  10:     0x7f257b9007db - <rayon_core[2c98653a724eac3a]::job::StackJob<rayon_core[2c98653a724eac3a]::latch::LatchRef<rayon_core[2c98653a724eac3a]::latch::LockLatch>, <rayon_core[2c98653a724eac3a]::registry::Registry>::in_worker_cold<<rayon_core[2c98653a724eac3a]::thread_pool::ThreadPool>::install<rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[2c98653a724eac3a]::job::Job>::execute
  11:     0x7f257b3c751e - <rayon_core[2c98653a724eac3a]::registry::WorkerThread>::wait_until_cold
  12:     0x7f257b3c4e2b - <rayon_core[2c98653a724eac3a]::registry::ThreadBuilder>::run
  13:     0x7f257b8f12aa - <<crossbeam_utils[35cc4efa95fb6007]::thread::ScopedThreadBuilder>::spawn<<rayon_core[2c98653a724eac3a]::ThreadPoolBuilder>::build_scoped<rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[2546ea2b789cb766]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  14:     0x7f257b8de6fe - std[11d1cbc04f31de61]::sys::backtrace::__rust_begin_short_backtrace::<alloc[b854695d616648d1]::boxed::Box<dyn core[2546ea2b789cb766]::ops::function::FnOnce<(), Output = ()> + core[2546ea2b789cb766]::marker::Send>, ()>
  15:     0x7f257b8f0d6a - <<std[11d1cbc04f31de61]::thread::Builder>::spawn_unchecked_<alloc[b854695d616648d1]::boxed::Box<dyn core[2546ea2b789cb766]::ops::function::FnOnce<(), Output = ()> + core[2546ea2b789cb766]::marker::Send>, ()>::{closure#1} as core[2546ea2b789cb766]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:     0x7f257df95c6b - std::sys::pal::unix::thread::Thread::new::thread_start::h08488c36460e4e66
  17:     0x7f2577e6bac3 - <unknown>
  18:     0x7f2577efd850 - <unknown>
  19:                0x0 - <unknown>


rustc version: 1.88.0-nightly (d5b4c2e4f 2025-04-02)
platform: x86_64-unknown-linux-gnu

thread 'rustc' panicked at /rustc/d5b4c2e4f19b6d7037371cdaecc3cc2c701c68df/compiler/rustc_query_system/src/dep_graph/serialized.rs:260:21:
Error: A dep graph node (trait_impls_of) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.

                     DepNode: DepKind { variant: 168 }(2546ea2b789cb766-4143b3fff6fd7203)
stack backtrace:
   0:     0x7f12ddcc2225 - std::backtrace::Backtrace::create::h4673396f9b64f746
   1:     0x7f12dc057f95 - std::backtrace::Backtrace::force_capture::he5345f147017f839
   2:     0x7f12db0e981f - std[11d1cbc04f31de61]::panicking::update_hook::<alloc[b854695d616648d1]::boxed::Box<rustc_driver_impl[30725cf523bc588e]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x7f12dc071a03 - std::panicking::rust_panic_with_hook::h2947a1eef4d16370
   4:     0x7f12dc0716fa - std::panicking::begin_panic_handler::{{closure}}::h965a5276f65cdfd8
   5:     0x7f12dc06dd19 - std::sys::backtrace::__rust_end_short_backtrace::he5ecad4245441128
   6:     0x7f12dc0713bd - __rustc[d03900b93b55ae64]::rust_begin_unwind
   7:     0x7f12d8aa19c0 - core::panicking::panic_fmt::h185128184dece584
   8:     0x7f12dda45554 - rustc_incremental[ebb4693b73fb20de]::persist::load::setup_dep_graph
   9:     0x7f12dd94e4cd - rustc_interface[83a6f685120d9f35]::interface::run_compiler::<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}
  10:     0x7f12db1007db - <rayon_core[2c98653a724eac3a]::job::StackJob<rayon_core[2c98653a724eac3a]::latch::LatchRef<rayon_core[2c98653a724eac3a]::latch::LockLatch>, <rayon_core[2c98653a724eac3a]::registry::Registry>::in_worker_cold<<rayon_core[2c98653a724eac3a]::thread_pool::ThreadPool>::install<rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[2c98653a724eac3a]::job::Job>::execute
  11:     0x7f12dabc751e - <rayon_core[2c98653a724eac3a]::registry::WorkerThread>::wait_until_cold
  12:     0x7f12dabc4e2b - <rayon_core[2c98653a724eac3a]::registry::ThreadBuilder>::run
  13:     0x7f12db0f12aa - <<crossbeam_utils[35cc4efa95fb6007]::thread::ScopedThreadBuilder>::spawn<<rayon_core[2c98653a724eac3a]::ThreadPoolBuilder>::build_scoped<rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[83a6f685120d9f35]::util::run_in_thread_pool_with_globals<rustc_interface[83a6f685120d9f35]::interface::run_compiler<(), rustc_driver_impl[30725cf523bc588e]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#3}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[2546ea2b789cb766]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  14:     0x7f12db0de6fe - std[11d1cbc04f31de61]::sys::backtrace::__rust_begin_short_backtrace::<alloc[b854695d616648d1]::boxed::Box<dyn core[2546ea2b789cb766]::ops::function::FnOnce<(), Output = ()> + core[2546ea2b789cb766]::marker::Send>, ()>
  15:     0x7f12db0f0d6a - <<std[11d1cbc04f31de61]::thread::Builder>::spawn_unchecked_<alloc[b854695d616648d1]::boxed::Box<dyn core[2546ea2b789cb766]::ops::function::FnOnce<(), Output = ()> + core[2546ea2b789cb766]::marker::Send>, ()>::{closure#1} as core[2546ea2b789cb766]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:     0x7f12dd795c6b - std::sys::pal::unix::thread::Thread::new::thread_start::h08488c36460e4e66
  17:     0x7f12d766bac3 - <unknown>
  18:     0x7f12d76fd850 - <unknown>
  19:                0x0 - <unknown>


rustc version: 1.88.0-nightly (d5b4c2e4f 2025-04-02)
platform: x86_64-unknown-linux-gnu

Dev setup that I use

• Neovim w/ Mason & nvim lsp-config
• using bacon to watch for changes. The exact job I use is below.

[jobs.bind]
command = ["cargo", "test", "export_bindings"] # generates typescript files using ts_rs crate
need_stdout = true
allow_warnings = true
on_success = "job:run"

[jobs.run]
command = ["cargo", "run", "--quiet", "--", "serve"] # runs an axum server
need_stdout = true
allow_warnings = true
background = false
on_change_strategy = "kill_then_restart"

Maybe the fact that bacon and the LSP are compiling at the same time influences it?

[Zoxc]

It seems likely that #138824 would be the PR introducing this error. It would be helpful to have a reproduction in case that PR does not introduce the root cause here. If you have a codebase that can be shared, starting from clean slate and building different commits could be a decent way to reproduce it.

[chrisp60]

It seems likely that #138824 would be the PR introducing this error. It would be helpful to have a reproduction in case that PR does not introduce the root cause here. If you have a codebase that can be shared, starting from clean slate and building different commits could be a decent way to reproduce it.

If I have time over the weekend, I can attempt to make a minimal reproduction as a shareable repo. Would be nice see this resolved.

Thank you all for the help in this matter!