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It seems that overriding an inherited virtual function causes a crash!

Not clear whether this is something you want to deal with, since (a) this example also crashes solc, and (b) there are probably other practical ways of avoiding the verification of A.f — other than deleting its body.

$ cat a.sol && solc-verify.py a.sol 
pragma solidity ^0.5.0;

contract A {
    int x;

    /// @notice postcondition x == 0
    function f() internal;
}

contract B is A {
    function f() internal { }

    /// @notice postcondition x == 0;
    function g() public { A.f(); }
}
Error while running compiler, details:
Internal compiler error during compilation:
/Users/mje/Code/solidity-boogie/libsolidity/codegen/ContractCompiler.cpp(1036): Throw in function void dev::solidity::ContractCompiler::appendModifierOrFunctionCode()
Dynamic exception type: boost::wrapexcept<langutil::InternalCompilerError>
std::exception::what: 
[dev::tag_comment*] = 

@michael-emmi did you report this upstream?

I have not yet. I have seen a related issue ethereum/solidity#5130 which was fixed in ethereum/solidity#5558 in December, but I haven’t determined whether the code we’re using includes ethereum/solidity#5558.

i added a comment to ethereum#5130, it's basically the same issue but the fix missed this case

Tracked in https://github.com/ethereum/solidity/issues/7314