15:55:43 executing program 1:
r0 = syz_open_dev$evdev(&(0x7f00000000c0), 0x0, 0x0)
ioctl$EVIOCSMASK(r0, 0x40104593, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000100)})
panic: replaceArg: group fields don't match: 0/2

goroutine 10 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b8960?}, {0xe56770?, 0xc0005b8b60?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b8940?}, {0xe56770?, 0xc0005b8b40?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b8920?}, {0xe56770?, 0xc0005b8b20?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b8900?}, {0xe56770?, 0xc0005b8b00?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b88e0?}, {0xe56770?, 0xc0005b8ae0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b88c0?}, {0xe56770?, 0xc0005b8ac0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b88a0?}, {0xe56770?, 0xc0005b8aa0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0005b8880?}, {0xe56770?, 0xc0005b8a80?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d44a0, 0xc0005b89a0, 0xc00b619540, {0xe56770, 0xc0005b8860?}, {0xc00b6194a8, {0x1db72e0, 0x4, 0x4}, 0xc00b673e60, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x0?, 0xc0002e0b60?, 0xc00142ddc8?, {0xe56770, 0xc0005b8860}, {0xc00b6194a8, {0x1db72e0, 0x4, 0x4}, 0xc00b673e60, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc00142de48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00b671580, {0xe52aa8?, 0xc0015f22d0}, 0x1e, 0xc000e22040, 0xc0000a3e90, {0xc000c98000, 0x40c, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc000e22080)
	/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