A couple of bug reports mostly related to disk I/O seem to have cropped up with BFS 423/3.4-ck2. The likely culprit seems to be the plugged I/O management within schedule() that I modified going from BFS 420 to BFS 423, when I adopted mainline's approach to managing the plugged I/O. It appears that the mechanism I had put in place for BFS was the correct one, and mainline's approach does not work (for BFS) so I've backed out that change and increased the version number. Here is the test patch:
Those with issues of any sort related to BFS 423 or ck2, please test this patch on top of the previous BFS patched kernel. Thanks!