syz_usb_connect(0x0, 0x3f, &(0x7f0000001380)={{0x12, 0x1, 0x0, 0x52, 0xcf, 0x43, 0x10, 0x403, 0x6041, 0x47c5, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x2d, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0x0, 0x0, 0x3, 0xc9, 0xc0, 0xd1, 0x0, [], [{{0x9, 0x5, 0x83}}, {{0x9, 0x5, 0x9, 0x1}}, {{0x9, 0x5, 0xa}}]}}]}}]}}, 0x0)
panic: replaceArg: group fields don't match: 0/2

goroutine 30 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef780?}, {0xe56770?, 0xc0008ef9e0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef760?}, {0xe56770?, 0xc0008ef9c0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef740?}, {0xe56770?, 0xc0008ef9a0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef620?}, {0xe56770?, 0xc0008ef880?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef600?}, {0xe56770?, 0xc0008ef860?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef5e0?}, {0xe56770?, 0xc0008ef840?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef5c0?}, {0xe56770?, 0xc0008ef820?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0008ef5a0?}, {0xe56770?, 0xc0008ef800?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d44a0, 0xc0008ef7c0, 0xc00bbc14a0, {0xe56770, 0xc0008ef580?}, {0xc00bbc1458, {0x1db72e0, 0x4, 0x4}, 0xc00bcd8690, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x418408?, 0xc0003aa9c0?, 0xc0016d3dc8?, {0xe56770, 0xc0008ef580}, {0xc00bbc1458, {0x1db72e0, 0x4, 0x4}, 0xc00bcd8690, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc0016d3e48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00bcee0c0, {0xe52aa8?, 0xc0014aa150}, 0x1e, 0xc0013c8280, 0xc00007af00, {0xc000c26000, 0x421, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc0013c8480)
	/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