Absolutely go for it! Post it even if you feel uncertain about it, just be clear about that, and about what your patch is trying to achieve, when the unexpected behaviour happens, and try to include a way for others to reproduce/investigate (as simple as possible, perhaps a program that demonstrates the bug). Also be clear about how you feel about whether or not the patch is the right approach and about what you would like list members to do with it (are you looking to confirm that what you're seeing is a real kernel bug, or a misunderstanding, or an application bug, and/or are you looking for help solving the bug/issue you're seeing, and/or are you looking to get it merged, etc). Can you demonstrate/quantify how your patch improves/fixes things, etc.