`rmeta` encoder panic

[crides]

Code

I don't think I can find a minimum example now (it's almost 2am), but the error is produced when compiling wezterm, specifically the wezterm-dynamic crate.

rustc also noted:

note: compiler flags: --crate-type rlib -C opt-level=3 -C embed-bitcode=no

This is actually a bit weird. I successfully compiled wezterm in release mode, opened neovim for some changes (which also runs rust-analyzer), and the ICE is hit when recompiling. cargo cleaning the wezterm-dynamic package doesn't help.

I'm currently on commit fec90ae04bf448d4b1475ba1d0ba1392846a70d6 of wezterm

Meta

rustc --version --verbose:

rustc 1.73.0 (cc66ad468 2023-10-03)
binary: rustc
commit-hash: cc66ad468955717ab92600c770da8c1601a4ff33
commit-date: 2023-10-03
host: x86_64-unknown-linux-gnu
release: 1.73.0
LLVM version: 17.0.2

Error output

thread 'rustc' panicked at compiler/rustc_metadata/src/rmeta/encoder.rs:442:9:
assertion failed: pos.get() <= self.position()

Backtrace

stack backtrace:
   0:     0x7f58c816349c - std::backtrace_rs::backtrace::libunwind::trace::he43a6a3949163f8c
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f58c816349c - std::backtrace_rs::backtrace::trace_unsynchronized::h50db52ca99f692e7
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f58c816349c - std::sys_common::backtrace::_print_fmt::hd37d595f2ceb2d3c
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f58c816349c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h678bbcf9da6d7d75
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f58c81c93fc - core::fmt::rt::Argument::fmt::h3a159adc080a6fc9
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/fmt/rt.rs:138:9
   5:     0x7f58c81c93fc - core::fmt::write::hb8eaf5a8e45a738e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f58c815612e - std::io::Write::write_fmt::h9663fe36b2ee08f9
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/io/mod.rs:1714:15
   7:     0x7f58c8163284 - std::sys_common::backtrace::_print::hcd4834796ee88ad2
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f58c8163284 - std::sys_common::backtrace::print::h1360e9450e4f922a
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f58c8166193 - std::panicking::default_hook::{{closure}}::h2609fa95cd5ab1f4
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:270:22
  10:     0x7f58c8165eac - std::panicking::default_hook::h6d75f5747cab6e8d
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:290:9
  11:     0x7f58cb330a3e - <alloc[98253621d83cbf53]::boxed::Box<rustc_driver_impl[566d207f92c3d9d2]::install_ice_hook::{closure#0}> as core[d28c4e8d9c4eebaa]::ops::function::Fn<(&dyn for<'a, 'b> core[d28c4e8d9c4eebaa]::ops::function::Fn<(&'a core[d28c4e8d9c4eebaa]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[d28c4e8d9c4eebaa]::marker::Sync + core[d28c4e8d9c4eebaa]::marker::Send, &core[d28c4e8d9c4eebaa]::panic::panic_info::PanicInfo)>>::call
  12:     0x7f58c81669be - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h05249de742e1768e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2021:9
  13:     0x7f58c81669be - std::panicking::rust_panic_with_hook::h57e78470c47c84de
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:711:13
  14:     0x7f58c8166701 - std::panicking::begin_panic_handler::{{closure}}::h3dfd2453cf356ecb
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:597:13
  15:     0x7f58c81639c6 - std::sys_common::backtrace::__rust_end_short_backtrace::hdb177d43678e4d7e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7f58c8166492 - rust_begin_unwind
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:595:5
  17:     0x7f58c81c5803 - core::panicking::panic_fmt::hd1e971d8d7c78e0e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/panicking.rs:67:14
  18:     0x7f58c81c5893 - core::panicking::panic::hd907d42d09324a32
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/panicking.rs:117:5
  19:     0x7f58ca6a161c - <rustc_span[4c9f011e8b033119]::hygiene::HygieneEncodeContext>::encode::<(&mut rustc_metadata[e6fe6e19e901579]::rmeta::encoder::EncodeContext, &mut rustc_metadata[e6fe6e19e901579]::rmeta::table::TableBuilder<u32, core[d28c4e8d9c4eebaa]::option::Option<rustc_metadata[e6fe6e19e901579]::rmeta::LazyValue<rustc_span[4c9f011e8b033119]::hygiene::SyntaxContextData>>>, &mut rustc_metadata[e6fe6e19e901579]::rmeta::table::TableBuilder<rustc_span[4c9f011e8b033119]::hygiene::ExpnIndex, core[d28c4e8d9c4eebaa]::option::Option<rustc_metadata[e6fe6e19e901579]::rmeta::LazyValue<rustc_span[4c9f011e8b033119]::hygiene::ExpnData>>>, &mut rustc_metadata[e6fe6e19e901579]::rmeta::table::TableBuilder<rustc_span[4c9f011e8b033119]::hygiene::ExpnIndex, core[d28c4e8d9c4eebaa]::option::Option<rustc_metadata[e6fe6e19e901579]::rmeta::LazyValue<rustc_span[4c9f011e8b033119]::hygiene::ExpnHash>>>), <rustc_metadata[e6fe6e19e901579]::rmeta::encoder::EncodeContext>::encode_hygiene::{closure#0}, <rustc_metadata[e6fe6e19e901579]::rmeta::encoder::EncodeContext>::encode_hygiene::{closure#1}>
  20:     0x7f58ca680476 - <rustc_metadata[e6fe6e19e901579]::rmeta::encoder::EncodeContext>::encode_crate_root
  21:     0x7f58ca5fdea8 - rustc_metadata[e6fe6e19e901579]::rmeta::encoder::encode_metadata_impl
  22:     0x7f58ca5f3559 - rustc_metadata[e6fe6e19e901579]::rmeta::encoder::encode_metadata
  23:     0x7f58ca5f1bfc - rustc_metadata[e6fe6e19e901579]::fs::encode_and_write_metadata
  24:     0x7f58ca5e7e40 - rustc_interface[5bdd18de9f5858d8]::passes::start_codegen
  25:     0x7f58ca5e24fa - <rustc_middle[5935fdd60c99b3fe]::ty::context::GlobalCtxt>::enter::<<rustc_interface[5bdd18de9f5858d8]::queries::Queries>::ongoing_codegen::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<alloc[98253621d83cbf53]::boxed::Box<dyn core[d28c4e8d9c4eebaa]::any::Any>, rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>
  26:     0x7f58ca5e19a6 - <rustc_interface[5bdd18de9f5858d8]::interface::Compiler>::enter::<rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}::{closure#2}, core[d28c4e8d9c4eebaa]::result::Result<core[d28c4e8d9c4eebaa]::option::Option<rustc_interface[5bdd18de9f5858d8]::queries::Linker>, rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>
  27:     0x7f58ca5dec68 - std[3759e478f3a6c4f2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5bdd18de9f5858d8]::util::run_in_thread_pool_with_globals<rustc_interface[5bdd18de9f5858d8]::interface::run_compiler<core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>, rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}>::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>
  28:     0x7f58ca5de3ee - <<std[3759e478f3a6c4f2]::thread::Builder>::spawn_unchecked_<rustc_interface[5bdd18de9f5858d8]::util::run_in_thread_pool_with_globals<rustc_interface[5bdd18de9f5858d8]::interface::run_compiler<core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>, rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}>::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#1} as core[d28c4e8d9c4eebaa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  29:     0x7f58c8171295 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haadd4e5af2ab0d62
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2007:9
  30:     0x7f58c8171295 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he4ba1fb09c16d807
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2007:9
  31:     0x7f58c8171295 - std::sys::unix::thread::Thread::new::thread_start::he524ecf4b47bee95
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys/unix/thread.rs:108:17
  32:     0x7f58c7e8c9eb - <unknown>
  33:     0x7f58c7f10dfc - <unknown>
  34:                0x0 - <unknown>

[crides]

Uhh apparently my disk was full. Clearing up made that go away. Would be nice if there's a proper message for something like this

[lqd]

This failure on a full disk has had many duplicates in the past and will not ICE like this anymore. This was fixed on nightly and beta by @saethlin in #115542 and will be stable in 1.74 in 3 weeks or so.

Let's close this as fixed, feel free to reopen if it happens again from 1.74 forward.