ICE generated when attempting to bootstrap on x86_64-unknown-linux-gnu with a local libc checkout

[lightspot21]

Steps to reproduce

Assuming rustc master, clean:

1. Clone libc from https://github.com/rust-lang/libc and checkout tag 0.2.99 (same as shown in rustc master's Cargo.lock) inside the rustc repo root.
2. Change Cargo.lock as:

diff --git a/Cargo.lock b/Cargo.lock
index 6b3a714920b..b9dc888b347 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1893,8 +1893,6 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 [[package]]
 name = "libc"
 version = "0.2.99"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7f823d141fe0a24df1e23b4af4e3c7ba9e5966ec514ea068c93024aa7deb765"
 dependencies = [
  "rustc-std-workspace-core",
 ]

3. Change Cargo.toml as:

diff --git a/Cargo.toml b/Cargo.toml
index 3822da2ccd5..a6f2bd40dac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -112,6 +112,6 @@ rustc-workspace-hack = { path = 'src/tools/rustc-workspace-hack' }
 rustc-std-workspace-core = { path = 'library/rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'library/rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'library/rustc-std-workspace-std' }
-
+libc = { path = 'libc' }
 [patch."https://github.com/rust-lang/rust-clippy"]
 clippy_lints = { path = "src/tools/clippy/clippy_lints" }

4. Run the following command

./x.py build -i --stage 1 --host x86_64-unknown-linux-gnu --target x86_64-unknown-linux-gnu compiler/rustc library/std

Error output

Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling autocfg v1.0.0
   Compiling libc v0.2.99 (/home/lightspot21/repos/rust/libc)
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.2
   Compiling syn v1.0.65
   Compiling cfg-if v0.1.10
   Compiling lazy_static v1.4.0
   Compiling cfg-if v1.0.0
   Compiling scopeguard v1.1.0
   Compiling log v0.4.14
   Compiling smallvec v1.6.1
   Compiling cc v1.0.69
   Compiling instant v0.1.6
thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `242338`,
 right: `10278`', compiler/rustc_query_impl/src/on_disk_cache.rs:555:5

error: internal compiler error: unexpected panic

note: 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 1.57.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z binary-dep-depinfo -Z force-unstable-if-unmarked -C embed-bitcode=no -C debuginfo=0 -C debug-assertions=off -C incremental --crate-type bin

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

query stack during panic:
end of query stack
error: could not compile `libc`
warning: build failed, waiting for other jobs to finish...
error: build failed
Build completed unsuccessfully in 0:05:27

Backtrace

stack backtrace:
   Compiling hashbrown v0.11.0
   0:     0x7f8435903243 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h39285ceae8a649f2
   1:     0x7f8435975fec - core::fmt::write::h0188529f4c2385fc
   2:     0x7f843591f6f2 - std::io::Write::write_fmt::hf8939236737fc0d3
   3:     0x7f84359030cf - std::sys_common::backtrace::print::h7e677897a0297258
   4:     0x7f8435928427 - std::panicking::default_hook::{{closure}}::h0a9e06d60f4c5f9c
   5:     0x7f84359281f3 - std::panicking::default_hook::h1c52e2b8cbfbaf22
   6:     0x7f84360e3641 - rustc_driver::DEFAULT_HOOK::{{closure}}::{{closure}}::he397f76e0ecfaebf
   7:     0x7f8435928893 - std::panicking::rust_panic_with_hook::h8de6825f28f52383
   8:     0x7f8435913d00 - std::panicking::begin_panic_handler::{{closure}}::h5d038e075ac84a09
   9:     0x7f8435913c44 - std::sys_common::backtrace::__rust_end_short_backtrace::h356ea3839faeb6de
  10:     0x7f8435928492 - rust_begin_unwind
  11:     0x7f84358e0721 - core::panicking::panic_fmt::h728f3e29540717bf
  12:     0x7f843597c5a8 - core::panicking::assert_failed_inner::hdb62319f1a85fb5d
  13:     0x7f843604f07b - core::panicking::assert_failed::h0c55ebb1577bca42
  14:     0x7f84375441b3 - rustc_query_impl::on_disk_cache::decode_tagged::h251b6dcb62aa0431
  15:     0x7f84375e90c6 - <rustc_query_impl::on_disk_cache::OnDiskCache as rustc_middle::ty::context::OnDiskCache>::new::h4b59b2a25ef5e78d
  16:     0x7f843625e6c3 - rustc_incremental::persist::load::load_query_result_cache::h19751fa193a8d613
  17:     0x7f8436285d90 - rustc_interface::passes::create_global_ctxt::hdc2c0bb7d305123c
  18:     0x7f843625cedc - rustc_interface::queries::Query<T>::compute::h5f94f459aa795199
  19:     0x7f84361bf559 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hc10f34e1794ae673
  20:     0x7f84361c0f0d - rustc_span::with_source_map::h45f4db966f4bc9be
  21:     0x7f84361c06f0 - rustc_interface::interface::create_compiler_and_run::ha040450ac43aa6bc
  22:     0x7f84360d6c8e - scoped_tls::ScopedKey<T>::set::hc1c18124f854b72d
  23:     0x7f84360e6565 - std::sys_common::backtrace::__rust_begin_short_backtrace::h0c16973631f3825e
  24:     0x7f84361ae561 - std::panicking::try::h5dbbfd1a4ce3a0df
  25:     0x7f84360cc6e6 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hed264ccaa380ed94
  26:     0x7f84359204f8 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h808e9eb66c407dff
  27:     0x7f84358f5c4a - std::sys::unix::thread::Thread::new::thread_start::h6a556919fb924504
  28:     0x7f84302f8259 - start_thread
  29:     0x7f84357775e3 - __GI___clone
  30:                0x0 - <unknown>

Tbh I feel I am doing something wrong here; the reason I use a separate libc is because of a port of rustc I am working on. I don't know much Rust so apologies for any errors.

[jyn514]

Likely a duplicate of #76720, since this is a stage 1 build.