Artifacts for Fuzzing SMT Solvers with Diversified Sub-formulas

## Installation:
```
virtualenv --python=/usr/bin/python3 virenv
source virenv/bin/activate
cd octopus
python3 setup.py install
```

## Usage:

```
octopus --benchmark=[PATH TO SEED DIRECTORY] --solverbin=[PATH TO SOLVER BIN] --solver=[SOLVER NAME] --theory=[SOLVER THEORY]
```

For example:

```
octopus --benchmark=/home/SMT2021 --solverbin=../z3/build/z3 --solver=z3 --theory=LIA
```

To run `n` parallel instances of octopus on `n` cores, use the `--cores` flag. For example:

```
octopus --benchmark=[PATH TO SEED FILES] --solverbin=[PATH TO SOLVER BIN] --solver=[SOLVER NAME] --theory=LIA --cores=10
```

## Refutational soundness bugs detected so far:
octopus has detected many new "refutational soundness" bugs in Z3. 
Here is a list of issues we reported.

https://github.com/Z3Prover/z3/issues/5373 `[z3]` `[QF_NRA]`  <br>
https://github.com/Z3Prover/z3/issues/5443 `[z3]` `[QF_BVFP]` <br>
https://github.com/Z3Prover/z3/issues/5447 `[z3]` `[QF_ABV]`  <br>
https://github.com/Z3Prover/z3/issues/5456 `[z3]` `[QF_IDL]`  <br>
https://github.com/Z3Prover/z3/issues/5457 `[z3]` `[QF_BV]`   <br>
https://github.com/Z3Prover/z3/issues/5460 `[z3]` `[QF_BV]`   <br>
https://github.com/Z3Prover/z3/issues/5468 `[z3]` `[AUFLIRA]` <br>
https://github.com/Z3Prover/z3/issues/5488 `[z3]` `[QF_BV]` <br>
https://github.com/Z3Prover/z3/issues/5502 `[z3]` `[QF_NIA]` <br>
https://github.com/Z3Prover/z3/issues/5508 `[z3]` `[QF_NIA]` <br>
https://github.com/Z3Prover/z3/issues/5423 `[z3]` `[QF_BVFP]` `Won't fixed` <br>