zpool hangs when mounted nested zvol

[kocoman]

Why in linux it works, but hangs in osx. I created a nested zvol, then create a zpool within that.

for example, I have 128gb x4 = 500gb, then I have 2 500 gb, so I create the 128gb as a jbod zfs (similar to lvm2 but osx can't read it (or the driver made only support 1 drive)
then in the jbod zfs create a zvol

then create a raidz1 with the jbod, and the 2 500gb, it creates fine, mounting it like that is ok in linux, for example mount the 128gb x4 first (jbod), then mount the jbod and the 2x 500gb.
doing the same hangs at the 2nd zpool mount (mount jbod and 2x500gb)

how to debug, thx