Adding stack shuffler loop bug

[msooseth]

How to reproduce

This is a .stack file that hopefully is correct. It reproduces in develop. You can generate this, and many others by cloning:

https://github.com/argotorg/solidity-fuzzing

Then following the README.md to build both normal & docker and then:

# (we are now in the `solidity-fuzzer` directory, NOT in `build/` or `build_ossfuzz`)
mkdir my_corpus_shuffler
./build_ossfuzz/tools/ossfuzz/shuffler_proto_ossfuzz my_corpus_shuffler
# [wait about 5s for it to crash]
PROTO_FUZZER_DUMP_PATH=crash.stack ./build_ossfuzz/tools/ossfuzz/shuffler_proto_ossfuzz ./crash-[crashnumber]
./build/tools/shuffler-fuzzer/stackshuffler --verbose crash.stack

Minimization

Enjoy! You can probably minimize it with:

./build_ossfuzz/tools/ossfuzz/shuffler_proto_ossfuzz  -minimize_crash=1 ./crash-[crashnumber]

and then take the ./minimized... to run the PROTO_FUZZER_DUMP to dump it then you'll get:

initial: [v0, phi0, phi0, lit0]
targetStackTop: [phi0, v0, v0, JUNK, phi0]
targetStackTailSet: {v0}
targetStackSize: 7

That has the same effect as the one I just committed here. So this is ALSO a minimizer, actually...

[clonker]

sweet! thanks :) please squash