The Latest Linux Kernel Git Code Fixes The EXT4 RAID0 Corruption Problem
With this MD fixes pull request, the corruption issue should be fully-resolved. Neil Brown noted in the pull request, "one serious RAID0 data corruption - caused by recent bugfix that wasn't reviewed properly."
This fix is present in the latest Linux Git code and will be found in tomorrow's release of Linux 4.1-rc5. This fix should also be back-ported to the relevant stable, currently-supported kernel series too in short order.