Halmos throws `Counterexample: unknown` warning on solc versions < 0.8.17

[Pranesh A S]

Describe the bug
I was recently trying to replicate Solmate's SignedWadMath.sol contract's wadMul() bug (see @karmacoma-eth's tweet). When I ran halmos --smt-div the tests PASSED with the following output:

Expected behavior: The test should fail.

To Reproduce

• Use this code: https://gist.github.com/PraneshASP/352924cdbf6935cb73631eb73bd5f273
• Set solc version in your foundry.toml to 0.8.15.
• Run halmos --smt-div

Environment:

• OS: Linux - Ubuntu 20.04
• Python version: Python 3.9.17
• Halmos and other dependency versions: Halmos 0.1.3.dev3+gd2c5d27

Additional context
Halmos produced expected counterexamples when solc version was >= 0.8.17

[Daejun Park]

@PraneshASP could you please try again with --solver-timeout-assertion 0, and let us know if you still see the discrepancy between the different solc versions?

[Daejun Park]

Confirmed that the old solc generated bytecode significantly slows down the prover. Will take a look how different the generated smt queries are. Thanks for reporting!