syz_usb_control_io$cdc_ncm(r0, 0x0, 0x0) (async, rerun: 64)
syz_usb_disconnect(r0) (rerun: 64)
syz_open_dev$char_usb(0xc, 0xb4, 0x0)
syz_usb_disconnect(r0)
panic: replaceArg: group fields don't match: 0/1

goroutine 13 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056ab80?}, {0xe56770?, 0xc00056b0e0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056ab00?}, {0xe56770?, 0xc00056b060?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056aa80?}, {0xe56770?, 0xc00056afe0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056aa60?}, {0xe56770?, 0xc00056afc0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056aa40?}, {0xe56770?, 0xc00056afa0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056aa20?}, {0xe56770?, 0xc00056af80?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056aa00?}, {0xe56770?, 0xc00056af60?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056a9e0?}, {0xe56770?, 0xc00056af40?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00056a9c0?}, {0xe56770?, 0xc00056af20?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d4620, 0xc00056ac00, 0xc0015c7270, {0xe56770, 0xc00056a9a0?}, {0xc0015c7098, {0x1db7580, 0x4, 0x4}, 0xc0016149f0, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x0?, 0x0?, 0x0?, {0xe56770, 0xc00056a9a0}, {0xc0015c7098, {0x1db7580, 0x4, 0x4}, 0xc0016149f0, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc001347e48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc0016487c0, {0xe52aa8?, 0xc000cb4060}, 0x1e, 0xc00137e4c0, 0xc000088e40, {0xc0009da000, 0x41a, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc00137eb80)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:95 +0x365
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:336 +0x1665