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Segfault while compiling bootstrap on a fresh git clone #81221

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Michael-F-Bryan opened this issue Jan 20, 2021 · 6 comments
Closed

Segfault while compiling bootstrap on a fresh git clone #81221

Michael-F-Bryan opened this issue Jan 20, 2021 · 6 comments
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C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

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@Michael-F-Bryan
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Michael-F-Bryan commented Jan 20, 2021 •
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While trying to reproduce #78778 with a brand new git clone (a4cbb44) I ran into a segfault while trying to build the bootstrapper.

More precisely, it seems to be the first build script that is run while compiling bootstrap's dependencies. I don't think it's related to the build scripts themselves because I tried running multiple times and different build scripts crashed each time.

I tried this code:

$ git clone git@github.com:Michael-F-Bryan/rust.git
$ cd rust
$ cp config.toml.example config.toml
$ git diff config.toml
  [llvm]
- #download-ci-llvm = false
+ download-ci-llvm = true

- #assertions = false
+ assertions = true
$ ./x.py help
(downloading of git submodules elided)

./x.py
info: Downloading and building bootstrap before processing --help
      command. See src/bootstrap/README.md for help with common
      commands.
Updating only changed submodules
Submodules updated in 0.02 seconds
   Compiling proc-macro2 v1.0.19
   Compiling syn v1.0.38
   Compiling memchr v2.3.3
   Compiling serde_derive v1.0.118
   Compiling libc v0.2.79
   Compiling serde v1.0.118
   Compiling log v0.4.11
   Compiling ryu v1.0.5
error: failed to run custom build command for `syn v1.0.38`

Caused by:
  process didn't exit successfully: `/home/michael/Documents/forks/rust/build/bootstrap/debug/build/syn-b7583bbd78159d8e/build-script-build` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...
error: build failed
failed to run: /home/michael/Documents/forks/rust/build/x86_64-unknown-linux-gnu/stage0/bin/cargo build --manifest-path /home/michael/Documents/forks/rust/src/bootstrap/Cargo.toml

Stepping through the build script with a debugger wasn't overly helpful because it doesn't look like it was compiled with debug symbols. I did notice that we try to invoke a null function pointer though:

$ gdb /home/michael/Documents/forks/rust/target/debug/build/proc-macro2-24f77336c7065965/build-script-build
...
(gdb) run
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000001 in ?? ()
(gdb) backtrace
#0  0x0000000000000001 in ?? ()
#1  0x00007fffffffde96 in ?? ()
#2  0x0000000000000000 in ?? ()

It may be because I've just read through @jyn514's "What does this compile error mean?" Zulip thread, but feels like there may be something wrong with which libstd build scripts are linked to.

Something else that may have contributed is me using download-ci-llvm = true in config.toml to try and avoid downloading LLVM over slow Australian internet.

Edit: Turns out download-ci-llvm = true had nothing to do with it. I removed that line and let x.py download LLVM and still got the segfault.
@Michael-F-Bryan Michael-F-Bryan added the C-bug Category: This is a bug. label Jan 20, 2021
@jyn514
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jyn514 commented Jan 20, 2021

This is super weird because bootstrap hasn't actually run yet. This is just the latest beta trying and failing to compile syn, which should have been caught weeks ago because everyone uses syn. The only thing I can think of is a corrupted download in the compiler, maybe?

@Michael-F-Bryan if you run cargo build in src/bootstrap with any other version of the compiler, does it work?

@jyn514 jyn514 added the T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) label Jan 20, 2021
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jyn514 commented Jan 20, 2021 •
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@Michael-F-Bryan by the way you ran gdb on the wrong process: syn's build script segfaulted, but you ran gdb on proc-macro2's build script.

@Michael-F-Bryan Michael-F-Bryan mentioned this issue Jan 20, 2021
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jyn514 commented Jan 20, 2021

@Michael-F-Bryan found that this worked after uninstalling and reinstalling their toolchain. I think the issue might be that the download was corrupted. @Mark-Simulacrum doesn't x.py use a checksum for checking the download?

@Michael-F-Bryan
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This may not even be a A-rustbuild issue. We tried compiling src/bootstrap/ with the cargo on my machine (completely skipping x.py and stage0/beta) and it still segfaulted.

Interestingly, I could build another Rust project (who's dependencies had build scripts) and everything worked as expected. I also had a copy of nightly-2020-07-27-x86_64-unknown-linux-gnu on my machine and that compiles bootstrap successfully.

The nightly I was using:

$ cargo --version --verbose
cargo 1.51.0-nightly (a73e5b7d5 2021-01-12)
release: 1.51.0
commit-hash: a73e5b7d567c3036b296fc6b33ed52c5edcd882e
commit-date: 2021-01-12
$ rustc --version --verbose
rustc 1.51.0-nightly (c5a96fb79 2021-01-19)
binary: rustc
commit-hash: c5a96fb7973649807a7943e7395456db158dcab6
commit-date: 2021-01-19
host: x86_64-unknown-linux-gnu
release: 1.51.0-nightly
LLVM version: 11.0.1
Verbose build logs 
$ cd src/bootstrap/
$ cargo build --verbose
   Compiling proc-macro2 v1.0.19
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.38
   Compiling autocfg v1.0.0
   Compiling version_check v0.9.1
   Compiling memchr v2.3.3
   Compiling lazy_static v1.4.0
   Compiling libc v0.2.79
     Running `rustc --crate-name build_script_build --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.19/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="proc-macro"' -C metadata=24f77336c7065965 -C extra-filename=-24f77336c7065965 --out-dir /home/michael/Documents/forks/rust/target/debug/build/proc-macro2-24f77336c7065965 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name build_script_build --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.38/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=1d3e0f000d1aea61 -C extra-filename=-1d3e0f000d1aea61 --out-dir /home/michael/Documents/forks/rust/target/debug/build/syn-1d3e0f000d1aea61 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name unicode_xid /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-xid-0.2.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=083414e3434d8e82 -C extra-filename=-083414e3434d8e82 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name autocfg /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/autocfg-1.0.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=96b2b2f3ecfdaa70 -C extra-filename=-96b2b2f3ecfdaa70 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name version_check /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/version_check-0.9.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=3832ed092abf33b7 -C extra-filename=-3832ed092abf33b7 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name build_script_build /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.3.3/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' --cfg 'feature="use_std"' -C metadata=51bf4da481d2d8ea -C extra-filename=-51bf4da481d2d8ea --out-dir /home/michael/Documents/forks/rust/target/debug/build/memchr-51bf4da481d2d8ea -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name lazy_static /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.4.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=cd2401a06b1676f6 -C extra-filename=-cd2401a06b1676f6 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name build_script_build /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.79/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=95d99096bf4eaa1e -C extra-filename=-95d99096bf4eaa1e --out-dir /home/michael/Documents/forks/rust/target/debug/build/libc-95d99096bf4eaa1e -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling cfg-if v0.1.10
     Running `rustc --crate-name cfg_if --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/cfg-if-0.1.10/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=4c6be1962c556cf0 -C extra-filename=-4c6be1962c556cf0 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling serde_derive v1.0.118
     Running `rustc --crate-name build_script_build /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.118/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=8606bbfd35cc2834 -C extra-filename=-8606bbfd35cc2834 --out-dir /home/michael/Documents/forks/rust/target/debug/build/serde_derive-8606bbfd35cc2834 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling serde v1.0.118
     Running `rustc --crate-name build_script_build /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.118/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="serde_derive"' --cfg 'feature="std"' -C metadata=448b8d4a09397093 -C extra-filename=-448b8d4a09397093 --out-dir /home/michael/Documents/forks/rust/target/debug/build/serde-448b8d4a09397093 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling log v0.4.11
     Running `rustc --crate-name build_script_build /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/log-0.4.11/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=3a9ea83eb03ac521 -C extra-filename=-3a9ea83eb03ac521 --out-dir /home/michael/Documents/forks/rust/target/debug/build/log-3a9ea83eb03ac521 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling regex-syntax v0.6.22
     Running `rustc --crate-name regex_syntax /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.22/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' -C metadata=4bf7f6e470e0e87e -C extra-filename=-4bf7f6e470e0e87e --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling ryu v1.0.5
   Compiling fnv v1.0.7
     Running `rustc --crate-name build_script_build --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/ryu-1.0.5/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=7e22e379072766a7 -C extra-filename=-7e22e379072766a7 --out-dir /home/michael/Documents/forks/rust/target/debug/build/ryu-7e22e379072766a7 -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name fnv /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/fnv-1.0.7/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=eef866999c50c67e -C extra-filename=-eef866999c50c67e --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling same-file v1.0.6
     Running `rustc --crate-name same_file --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/same-file-1.0.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8bd8ac94a4a06b38 -C extra-filename=-8bd8ac94a4a06b38 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling serde_json v1.0.59
     Running `rustc --crate-name build_script_build --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.59/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=0dd4d131535a197c -C extra-filename=-0dd4d131535a197c --out-dir /home/michael/Documents/forks/rust/target/debug/build/serde_json-0dd4d131535a197c -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling cc v1.0.60
   Compiling itoa v0.4.6
     Running `rustc --crate-name itoa /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/itoa-0.4.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=a6b26c0a10370aa4 -C extra-filename=-a6b26c0a10370aa4 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
     Running `rustc --crate-name cc --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/cc-1.0.60/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=c0c008fc9b8684cf -C extra-filename=-c0c008fc9b8684cf --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling unicode-width v0.1.8
     Running `rustc --crate-name unicode_width /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-width-0.1.8/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=85f6c02835e49e35 -C extra-filename=-85f6c02835e49e35 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling bootstrap v0.0.0 (/home/michael/Documents/forks/rust/src/bootstrap)
     Running `rustc --crate-name build_script_build --edition=2018 src/bootstrap/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=10118bf5840f696d -C extra-filename=-10118bf5840f696d --out-dir /home/michael/Documents/forks/rust/target/debug/build/bootstrap-10118bf5840f696d -C linker=/usr/bin/clang -C incremental=/home/michael/Documents/forks/rust/target/debug/incremental -L dependency=/home/michael/Documents/forks/rust/target/debug/deps -C link-arg=-nostartfiles`
   Compiling opener v0.4.1
     Running `rustc --crate-name opener --edition=2018 /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/opener-0.4.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=db0827d86dd0db60 -C extra-filename=-db0827d86dd0db60 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --cap-lints allow -C link-arg=-nostartfiles`
   Compiling build_helper v0.1.0 (/home/michael/Documents/forks/rust/src/build_helper)
     Running `rustc --crate-name build_helper --edition=2018 src/build_helper/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=42cf7bea14769a8a -C extra-filename=-42cf7bea14769a8a --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -C incremental=/home/michael/Documents/forks/rust/target/debug/incremental -L dependency=/home/michael/Documents/forks/rust/target/debug/deps -C link-arg=-nostartfiles`
   Compiling thread_local v1.0.1
     Running `rustc --crate-name thread_local /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/thread_local-1.0.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=b1b857567b38aff1 -C extra-filename=-b1b857567b38aff1 --out-dir /home/michael/Documents/forks/rust/target/debug/deps -C linker=/usr/bin/clang -L dependency=/home/michael/Documents/forks/rust/target/debug/deps --extern lazy_static=/home/michael/Documents/forks/rust/target/debug/deps/liblazy_static-cd2401a06b1676f6.rmeta --cap-lints allow -C link-arg=-nostartfiles`
     Running `/home/michael/Documents/forks/rust/target/debug/build/memchr-51bf4da481d2d8ea/build-script-build`
error: failed to run custom build command for `memchr v2.3.3`

Caused by:
  process didn't exit successfully: `/home/michael/Documents/forks/rust/target/debug/build/memchr-51bf4da481d2d8ea/build-script-build` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...
error: build failed
cargo build --verbose  18.60s user 1.52s system 450% cpu 4.467 total

@Michael-F-Bryan
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After reinstalling the nightly toolchain (same version and commit hashes) I am no longer able to reproduce this issue.

cargo bisect-rustc is also unable to figure out when the issue was introduced because both the start and end versions compile bootstrap fine. I'm guessing something went wrong when I did a rustup update?

@jyn514 jyn514 added E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example and removed T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Jan 20, 2021
@Michael-F-Bryan
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The problem turned out to be between seat and keyboard, here. The terminal I was trying to build bootstrap on had RUSTFLAGS=-C link-arg=-nostartfiles set, whereas when I reinstalled nightly I was using another terminal without a modified RUSTFLAGS.

This isn't an issue with Rust.

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