BEFORE ioctl, vn0s1a@0  (in-slice, expect 'df2878-inside-slice'): df2878-inside-slice
BEFORE ioctl, vn0s1a@61796 (out-of-slice offset): read=-1 errno=22 (Invalid argument)
DIOCSDINFO32: REJECTED: No space left on device
=> kernel enforces slice bounds on the set path (patched?)
EXIT=1