Description
This is a bit of a complicated issue to report, because it happened seemingly at random after introducing a change in my code. This change lead to a compile error, and afterward a single rustc thread caused my computer to freeze with 15gb of ram usage, and 100% of a single cpu core.
An archive of my project is included. This happens when running any of cargo check, clippy, build in the project folder.
Sorry, this is not a minimally-reproducible example, because it happened on a complex project, and I am not sure what part of my code causes this behavior to show.
The behavior described below does not appear if the following lines in src/routes/game.rs are commented. In that case, cargo reports some warnings, then exits normally.
// (near line 30)
if let Some(game) = game.first() {
//let language_ids = game.languages.iter().map(|x| x.id).collect();
//let other_languages = conn
// .run(|c| {
// language::table
// .filter(language::columns::id.is_distinct_from(language_ids))
// .load(c)
// })
// .await?;
Ok(Template::render(
"game_full",
context! {
game,
},
))
} else {
Err(ApplicationError::NoSuchGame { id })
}I expected to see this happen: rustc to show the error and eventually exit
Instead, this happened: cargo shows the following error:
error[E0283]: type annotations needed
--> src/routes/game.rs:31:13
|
31 | let language_ids = game.languages.iter().map(|x| x.id).collect();
| ^^^^^^^^^^^^ ------- type must be known at this point
|
= note: cannot satisfy `_: FromIterator<i32>`
note: required by a bound in `std::iter::Iterator::collect`
--> /home/khais/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:1999:19
|
1999 | fn collect<B: FromIterator<Self::Item>>(self) -> B
| ^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Iterator::collect`
help: consider giving `language_ids` an explicit type
|
31 | let language_ids: Vec<_> = game.languages.iter().map(|x| x.id).collect();
| ++++++++
^C Building [=======================> ] 380/381: ttrpgs(bin)and then consumes more and more ram until I am forced to kill the process
ps capture of the offending process:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
khais 2303047 99.6 57.1 31193988 18702996 pts/1 SNl+ 12:32 5:51 /home/khais/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc --crate-name ttrpgs --edition=2021 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=175 --crate-type bin --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 -C metadata=43694494ee23ddb7 -C extra-filename=-43694494ee23ddb7 --out-dir /home/khais/src/ttrpgs_bug_report/target/debug/deps -C incremental=/home/khais/src/ttrpgs_bug_report/target/debug/incremental -L dependency=/home/khais/src/ttrpgs_bug_report/target/debug/deps --extern chrono=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libchrono-df20a4981cc1ae50.rmeta --extern csv=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libcsv-914302b8947f3c7d.rmeta --extern diesel=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libdiesel-e10c470af87fb562.rmeta --extern dotenvy=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libdotenvy-9821549988c77cf3.rmeta --extern regex=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libregex-e744e5e84862ee01.rmeta --extern rocket=/home/khais/src/ttrpgs_bug_report/target/debug/deps/librocket-f85756e2b94ef3e4.rmeta --extern rocket_db_pools=/home/khais/src/ttrpgs_bug_report/target/debug/deps/librocket_db_pools-0b6644166093e0a7.rmeta --extern rocket_dyn_templates=/home/khais/src/ttrpgs_bug_report/target/debug/deps/librocket_dyn_templates-d688c2b13a9ab27e.rmeta --extern rocket_sync_db_pools=/home/khais/src/ttrpgs_bug_report/target/debug/deps/librocket_sync_db_pools-0fae6578655fff9d.rmeta --extern sea_orm=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libsea_orm-c9115e6c44d3c8a0.rmeta --extern serde=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libserde-2640d9b683a951ea.rmeta --extern smol=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libsmol-abd1ae4bbcdc3952.rmeta --extern thiserror=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libthiserror-3084c89a5d4ce759.rmeta --extern tokio=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libtokio-5825f409e9792f63.rmeta --extern ttrpgs=/home/khais/src/ttrpgs_bug_report/target/debug/deps/libttrpgs-60d690e0592caaf5.rmeta -C linker=clang -C link-arg=-fuse-ld=lld -L native=/usr/lib
Meta
rustc --version --verbose:
rustc 1.78.0 (9b00956e5 2024-04-29)
binary: rustc
commit-hash: 9b00956e56009bab2aa15d7bff10916599e3d6d6
commit-date: 2024-04-29
host: x86_64-unknown-linux-gnu
release: 1.78.0
LLVM version: 18.1.2
This also happens in nightly (not sure how to check the version).
rustup +nightly show
Default host: x86_64-unknown-linux-gnu
rustup home: /home/khais/.rustup
installed toolchains
--------------------
stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu
active toolchain
----------------
nightly-x86_64-unknown-linux-gnu (overridden by +toolchain on the command line)
rustc 1.80.0-nightly (84b40fc90 2024-05-27)
System information:
Linux 6.8.5-zen1-1-zen #1 ZEN SMP PREEMPT_DYNAMIC Thu, 11 Apr 2024 01:47:18 +0000 x86_64 unknown unknown GNU/Linux
CPU: 13th Gen Intel i5-13400F (16) @ 4.600GHz
Backtrace
This is not applicable here, since compilation does not finish.
I am happy to provide more details if requested. I am not very experienced in compiler internals, and this is the first time I'm submitting a bug report here.