r0 = socket$netlink(0x10, 0x3, 0x8000000004)
writev(r0, &(0x7f0000001200)=[{&(0x7f0000000080)="580000001400add427323b472545b4560a117fffffff81000e224e227f000001925aa80020007b000900800f7f000001e809000000ff0000f03ac710a6960000ffffffffffffffffffe7ee00000000000000000200000000", 0x58}], 0x1)
panic: replaceArg: group fields don't match: 0/1

goroutine 24 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0168323a0?}, {0xe56770?, 0xc016832ea0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832320?}, {0xe56770?, 0xc016832e20?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0168322a0?}, {0xe56770?, 0xc016832da0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832280?}, {0xe56770?, 0xc016832d80?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832260?}, {0xe56770?, 0xc016832d60?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832240?}, {0xe56770?, 0xc016832d40?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832220?}, {0xe56770?, 0xc016832d20?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc016832200?}, {0xe56770?, 0xc016832d00?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0168321e0?}, {0xe56770?, 0xc016832ce0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d4620, 0xc0168324e0, 0xc01671abe0, {0xe56770, 0xc0168321c0?}, {0xc01671aa08, {0x1db7580, 0x4, 0x4}, 0xc01671d2c0, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x0?, 0xc00e5d9de0?, 0xc001d87dc8?, {0xe56770, 0xc0168321c0}, {0xc01671aa08, {0x1db7580, 0x4, 0x4}, 0xc01671d2c0, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc001d87e48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc01b8f2d40, {0xe52aa8?, 0xc00bd74090}, 0x1e, 0xc01134e000, 0xc00007e870, {0xc015c08000, 0x9aa6, 0xac00})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc01134e200)
	/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