syz_usb_connect(0x0, 0x4a, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100005520f010402038b1420104000001090238000100000000090400000371055900090582eb10000000010200"], 0x0)
panic: replaceArg: group fields don't match: 0/2

goroutine 10 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d820?}, {0xe56770?, 0xc000520e60?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d800?}, {0xe56770?, 0xc000520e40?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d7e0?}, {0xe56770?, 0xc000520e20?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d7c0?}, {0xe56770?, 0xc000520e00?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d7a0?}, {0xe56770?, 0xc000520de0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d780?}, {0xe56770?, 0xc000520dc0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d760?}, {0xe56770?, 0xc000520da0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc00051d740?}, {0xe56770?, 0xc000520d80?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d44a0, 0xc00051d8e0, 0xc00b4fd040, {0xe56770, 0xc00051d720?}, {0xc00b4fcbe8, {0x1db72e0, 0x4, 0x4}, 0xc00b50d350, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x0?, 0x7fe629f965b8?, 0x40?, {0xe56770, 0xc00051d720}, {0xc00b4fcbe8, {0x1db72e0, 0x4, 0x4}, 0xc00b50d350, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc0007c1e48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00b635240, {0xe52aa8?, 0xc00115e030}, 0x1e, 0xc0017a6080, 0xc00007ae40, {0xc0011d6000, 0x425, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc0017a6200)
	/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