Note that if it *is* the same bug as #1713751, that reporter already mentioned that using mainline kernels (and he was hitting this on 4.10) fixed it for him, so it seems more plausible not that 4.14 has a fix, but that Ubuntu's sauce has the breakage. Of course, they may well not be the same bug, cause the symptom itself is pretty generic.
Note that if it *is* the same bug as #1713751, that reporter already mentioned that using mainline kernels (and he was hitting this on 4.10) fixed it for him, so it seems more plausible not that 4.14 has a fix, but that Ubuntu's sauce has the breakage. Of course, they may well not be the same bug, cause the symptom itself is pretty generic.