symbol not found issue when building fuzz target with plugins

[0xalpharush]

I ran cargo +nightly afl config --build --plugins successfully in order to use AFL++'s instrumentation passes. When I run cargo afl build, I get the following error:

error: failed to run LLVM passes: Could not load library '~/.local/share/afl.rs/rustc-1.83.0-nightly-6f4ae0f/afl.rs-0.15.10/afl-llvm/cmplog-instructions-pass.so': dlopen(~/.local/share/afl.rs/rustc-1.83.0-nightly-6f4ae0f/afl.rs-0.15.10/afl-llvm/cmplog-instructions-pass.so, 0x0009): symbol not found in flat namespace '__ZN4llvm17PreservedAnalyses14AllAnalysesKeyE'

There is a similarly named symbol in the share library:

$ llvm-nm ~/.local/share/afl.rs/rustc-1.83.0-nightly-6f4ae0f/afl.rs-0.15.10/afl-llvm/cmplog-instructions-pass.so | rustfilt | grep "PreservedAnalyses"
                 U _llvm::PreservedAnalyses::AllAnalysesKey

I'm not sure how to resolve this... Maybe I need to install a specific rustc/llvm/afl-rs for them to cooperate? Any help is greatly appreciated!

If I try to build with LLVM 18.1.8 I get: called `Result::unwrap()` on an `Err` value: llvm-config --version output does not contain expected major version (19)

Fwiw, here's where the name appears in the AFLPlusPlus codebase https://github.com/search?q=repo%3AAFLplusplus%2FAFLplusplus+PreservedAnalyses&type=code

Other background that may be useful:

$ llvm-config --version                                                            
19.1.1

$ rustup show
active toolchain
----------------

nightly-aarch64-apple-darwin (default)
rustc 1.83.0-nightly (6f4ae0f34 2024-10-08)

$ rustup component add llvm-tools-preview
info: component 'llvm-tools' for target 'aarch64-apple-darwin' is up to date

$ echo $LLVM_CONFIG 
llvm-config

[smoelius]

Hi, @0xalpharush. Plugins are currently only supported on Linux (though this needs to be better documented).

We don't test the plugins on macOS in CI for this reason:

afl.rs/.github/workflows/rust.yml

Lines 37 to 39 in 4e02a97

	exclude:
	- environment: macos-latest
	plugins: true

I hope this hasn't caused you to lose too much time.

[michprev]

Hey @smoelius,
I am having a similar problem with Ubuntu ARM docker image (https://hub.docker.com/r/arm64v8/ubuntu/).

The error:

error: failed to run LLVM passes: Could not load library '/root/.local/share/afl.rs/rustc-1.84.0-nightly-03ee484/afl.rs-0.15.11/afl-llvm/cmplog-instructions-pass.so': /root/.local/share/afl.rs/rustc-1.84.0-nightly-03ee484/afl.rs-0.15.11/afl-llvm/cmplog-instructions-pass.so: undefined symbol: _ZTVN4llvm24IRBuilderDefaultInserterE

rustc -vV prints LLVM version: 19.1.3. I installed LLVM through apt install llvm-19 (which actually installs the version 19.1.1).

[smoelius]

@michprev That doesn't surprise me, and I should have been more precise in #539 (comment).

LLVM plugins work for only x86_64-unknown-linux-gnu currently. This precludes ARM as well.

This issue is tracked here: rust-lang/rust#127577