Crash in wasm-opt on librustc_expand tests via wasi

[0x7CFE]

rustc repo revision rust-lang/rust@5a59527
Linux epsilon 5.3.0-46-generic #38~18.04.1-Ubuntu SMP Tue Mar 31 04:17:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
rustc 1.44.0-nightly (b2e36e6c2 2020-04-22)

korvin@epsilon:~/work/research/rust/rust/src/librustc_expand$ cargo wasi test --release --verbose
     Running "cargo" "test" "--target" "wasm32-wasi" "--message-format" "json-render-diagnostics" "--release" "--verbose"
       Fresh semver-parser v0.7.0
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       Fresh rustc_fs_util v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_fs_util)
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warning: unused import: `std::ffi::CString`
 --> src/librustc_fs_util/lib.rs:1:5
  |
1 | use std::ffi::CString;
  |     ^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: 1 warning emitted

       Fresh unicode-normalization v0.1.11
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       Fresh rustc_index v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_index)
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       Fresh rustc_ast v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_ast)
       Fresh rustc_target v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_target)
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       Fresh rustc_ast_pretty v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_ast_pretty)
       Fresh rustc_session v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_session)
       Fresh rustc_attr v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_attr)
       Fresh rustc_parse v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_parse)
       Fresh rustc_ast_passes v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_ast_passes)
   Compiling rustc_expand v0.0.0 (/home/korvin/work/research/rust/rust/src/librustc_expand)
     Running `rustc --crate-name rustc_expand --edition=2018 src/librustc_expand/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -C opt-level=3 -Cbitcode-in-rlib=no --test -C metadata=ccc7245434d89774 -C extra-filename=-ccc7245434d89774 --out-dir /home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps --target wasm32-wasi -L dependency=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps -L dependency=/home/korvin/work/research/rust/rust/target/release/deps --extern log=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/liblog-4633d8b382cc57e8.rlib --extern rustc_ast=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_ast-09ec447bcc96195e.rlib --extern rustc_ast_passes=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_ast_passes-5a437d804d3a513c.rlib --extern rustc_ast_pretty=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_ast_pretty-cb46c512a3c20514.rlib --extern rustc_attr=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_attr-1b0334f640232712.rlib --extern rustc_data_structures=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_data_structures-eb47bd2a5aa3d194.rlib --extern rustc_errors=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_errors-b0300a2d5eb53df2.rlib --extern rustc_feature=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_feature-0895b818a2165161.rlib --extern rustc_lexer=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_lexer-b7b1a42dc61018a9.rlib --extern rustc_parse=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_parse-8766651ff98a1c8e.rlib --extern rustc_session=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_session-3adbb314a5c31450.rlib --extern rustc_span=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/librustc_span-b2f468220293d946.rlib --extern rustc_serialize=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/libserialize-3662cdb939e25743.rlib --extern smallvec=/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/libsmallvec-27de5772d4c8514b.rlib`
    Finished release [optimized] target(s) in 4.71s
     Running `/home/korvin/.cargo/bin/cargo-wasi /home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/rustc_expand-ccc7245434d89774.wasm`
  Processing /home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/rustc_expand-ccc7245434d89774.rustc.wasm
  Optimizing with wasm-opt
     Running "/home/korvin/.cache/cargo-wasi/0.1.22/wasm-opt" "/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/.tmpdLBeLi/input.wasm" "-O3" "-o" "/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/rustc_expand-ccc7245434d89774.wasi.wasm" "--debuginfo"
error: failed to process wasm at `/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/rustc_expand-ccc7245434d89774.rustc.wasm`

Caused by:
    `wasm-opt` failed to execute

Caused by:
    failed to execute "/home/korvin/.cache/cargo-wasi/0.1.22/wasm-opt" "/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/.tmpdLBeLi/input.wasm" "-O3" "-o" "/home/korvin/work/research/rust/rust/target/wasm32-wasi/release/deps/rustc_expand-ccc7245434d89774.wasi.wasm" "--debuginfo"
        status: signal: 11

[kripken]

Please provide the wasm file that wasm-opt gets as input, so that we can investigate this.

[0x7CFE]

Please find the file attached (it's gzipped since Github does not allow to attach .wasm files )
input.wasm.gz

[aheejin]

Running

wasm-opt -O3 --debuginfo input.wasm

does not produce any errors. Is this the right command line to reproduce the error?

[0x7CFE]

Yes, I'm able to reproduce the crash with the very same command line. However, if I change opt level to -O2 all starts working as expected.

Also, for some reason if I passs -d flag it works even on -O3.

[0x7CFE]

I tried to build wasm-opt from sources and looks like the most recent version works fine on my input. The issue is probably with cargo wasi providing an outdated version.

[sbc100]

Can this issue be closed now?

[aheejin]

The issue seems resolved. Closing.