Error on mounting RAIZN with f2fs

[rufquf2628]

I tried to mount RAIZN with f2fs and run some benchmark with it.
It seems mounted well on f2fs.
However, when I run some fio and dbbench benchmarks, the CPUs are stucked during write operation.

In this code, RAIZN delays CPU for 2 ms when write pointer is before the bio sector.
With f2fs, RAIZN enters infinite loop for here.
Is there any troubleshooting or fix for this error?