ICE compiling dashmap

[djmarcin]

This is just a copy/paste from the compiler error output. I'm running rust via bazel, not cargo, using nightly-2020-12-08.

INFO: From Compiling Rust lib dashmap v3.11.10 (16 files):
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/query/mod.rs:235:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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 1.50.0-nightly (3d6705aa5 2020-12-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=0 -C debuginfo=0 -C linker=/usr/bin/gcc -C link-args=-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm -C incremental --crate-type lib

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

query stack during panic:
end of query stack
thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `LLVMing`,
 right: `Codegenning`', /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/compiler/rustc_codegen_ssa/src/back/write.rs:1425:21

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 1.50.0-nightly (3d6705aa5 2020-12-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=0 -C debuginfo=0 -C linker=/usr/bin/gcc -C link-args=-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm -C incremental --crate-type lib

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

query stack during panic:
end of query stack

[camelid]

Duplicate of #79661. Should be fixed in the next nightly (2020-12-09).

[djmarcin]

I just updated to 2020-12-10 and the ICE occurred again, so it doesn't appear to be fixed.

[camelid]

Hmm, that's unfortunate. Can you post the ICE you get on 2020-12-10 so we can see if perhaps it's slightly different?

[djmarcin]

Here's the latest error. At first the build succeeded, but a second build of the same code failed.

INFO: From Compiling Rust bin build_script_script_ (1 files):
--
  | thread 'rustc' panicked at 'Failed to recover key for type_of(f441f7c09333dbee-181350e87790bb85) with hash f441f7c09333dbee-181350e87790bb85', compiler/rustc_middle/src/ty/query/mod.rs:235:5
  | note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
  |  
  | 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 1.50.0-nightly (f0f68778f 2020-12-09) running on x86_64-unknown-linux-gnu
  |  
  | note: compiler flags: -C opt-level=3 -C debuginfo=0 -C linker=/usr/bin/gcc -C link-args=-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm -Wl,--gc-sections -C incremental --crate-type bin
  |  
  | note: some of the compiler flags provided by cargo are hidden
  |  
  | query stack during panic:
  | end of query stack
  | thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  | left: `LLVMing`,
  | right: `Codegenning`', /rustc/f0f68778f798d6d34649745b41770829b17ba5b8/compiler/rustc_codegen_ssa/src/back/write.rs:1425:21
  |  
  | 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 1.50.0-nightly (f0f68778f 2020-12-09) running on x86_64-unknown-linux-gnu
  |  
  | note: compiler flags: -C opt-level=3 -C debuginfo=0 -C linker=/usr/bin/gcc -C link-args=-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm -Wl,--gc-sections -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: common/BUILD:6:19: output 'common/build_script_script_' was not created
  | ERROR: common/BUILD:6:19: Couldn't build file common/build_script_script_: not all outputs were created or valid
  | INFO: From Compiling Rust bin build_script_script_ (1 files):
  | thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_metadata/src/rmeta/decoder.rs:1565:75
  | note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
  |  
  | 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 1.50.0-nightly (f0f68778f 2020-12-09) running on x86_64-unknown-linux-gnu
  |  
  | note: compiler flags: -C opt-level=3 -C debuginfo=0 -C linker=/usr/bin/gcc -C link-args=-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm -Wl,--gc-sections -C incremental --crate-type bin
  |  
  | note: some of the compiler flags provided by cargo are hidden
  |  
  | query stack during panic:
  | #0 [normalize_generic_arg_after_erasing_regions] normalizing `log::STATIC_MAX_LEVEL`
  | #1 [collect_and_partition_mono_items] collect_and_partition_mono_items
  | end of query stack

[djmarcin]

An aside -- when I say 2020-12-10 I mean the file downloaded at https://static.rust-lang.org/dist/2020-12-10/rust-nightly-x86_64-unknown-linux-gnu.tar.gz -- but it appears to have embedded f0f68778f 2020-12-09. When saying a nightly version, is it the URL date or embedded date that folks usually use?

[camelid]

To my knowledge, the nightly version is whatever comes out of rustc --version :)

In your case, it seems to be nightly-2020-11-09.

[camelid]

It seems like #79721 introduced another bug? The panic message changed.

[jyn514]

The new ICE is a duplicate of #79890.