LLVM ERROR: Broken module found, compilation aborted

[zamazan4ik]

Hi!

I am trying to test PGO with https://github.com/cloudflare/boringtun . I have the following errors:

... <lines omitted>
Compiling boringtun v0.5.2 (/Users/zamazan4ik/open_source/boringtun/boringtun)
warning: unused variable: `fwmark`===> ] 170/177: clap, boringtun, clap, criterion
   --> boringtun/src/device/peer.rs:107:9
    |
107 |         fwmark: Option<u32>,
    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fwmark`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: 535 warnings emitted========> ] 172/177: boringtun, criterion

   Compiling boringtun-cli v0.5.2 (/Users/zamazan4ik/open_source/boringtun/boringtun-cli)
warning: unused variable: `fwmark`===> ] 174/177: crypto_benches(bench), boringtun(test), boringtun-cli(bin test)
   --> boringtun/src/device/peer.rs:107:9
    |
107 |         fwmark: Option<u32>,
    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fwmark`
    |
    = note: `#[warn(unused_variables)]` on by default

module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `boringtun-cli`; 3 warnings emitted
warning: build failed, waiting for other jobs to finish...
module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `boringtun`; 26 warnings emitted
module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `boringtun`; 48 warnings emitted
PGO optimized build has failed.
Cargo finished with an error (101)

I did the following steps:

• Run cargo pgo bench. All is fine here.
• Run cargo pgo optimize bench. Here I got the errors.

I have tried to google the error but with no success. I didn't dig into LLVM, however.

If you need additional information - I would be happy to provide it :)

[Kobzol]

Hi, sorry for the late response, I was a bit sick over the weekend.

I have tested the crate with rustc 1.68.0 and these two commands worked for me. I wonder if this could have something to do with the sudo -E script in boringtun's config.toml. I disabled it when I ran the benchmarks.

When I ran the benchmarks with the sudo flag, cargo pgo optimize wasn't even able to open the PGO profiles.

[zamazan4ik]

Hi, sorry for the late response, I was a bit sick over the weekend.

No worries - health is much more important!

Hi, sorry for the late response, I was a bit sick over the weekend.

Hmm... I will try to do the same things and will report the results. Initially forgot to say - my env is macOS 13.2.1.

[zamazan4ik]

I got the same issue when building Vector ( https://github.com/vectordotdev/vector , from master branch on dc665666bcd4d3487ca3684fd2fe41d4415cea52 commit):

cargo pgo optimize

<skipped some logs>
...
Compiling vector v0.33.0 (/home/zamazan4ik/open_source/vector)
module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `vector` (bin "secret-backend-example"); 201 warnings emitted
warning: build failed, waiting for other jobs to finish...
module flag identifiers must be unique (or of 'require' type)
!"CG Profile"
LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `vector` (bin "vector")
PGO optimized build has failed.
Cargo finished with an error (101)

OS: Fedora 38
Rust version: https://github.com/vectordotdev/vector/blob/master/rust-toolchain.toml (1.71.1)

Not sure what is the reason for the error.

[zamazan4ik]

Seems like I found the reason in LLVM: llvm/llvm-project#57501 . Since the issue is reproduced not only by me, I think it should be reported to rustc repo as well.