panic: bad arg kind: <nil>

goroutine 26 [running]:
github.com/google/syzkaller/prog.clone(0x0, 0x0, 0xc00133b288, 0xc0033fb6e0, 0xc0033fb6b0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/clone.go:79 +0x91b
github.com/google/syzkaller/prog.(*Prog).Clone(0xc002930900, 0x9015b6)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/clone.go:24 +0x279
github.com/google/syzkaller/prog.(*randGen).resourceCentric(0xc0027ed480, 0xc002b10190, 0xcafba0, 0x0, 0x0, 0x0, 0xc002beef40, 0xc00133b528, 0x792dc9)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:839 +0xc2
uvm_fault(0xfffffd806bc09aa0, 0xa, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      vio_rxeof+0x191:        movzwl  0xa(%r15),%eax