syz_usb_control_io$hid(r0, 0x0, &(0x7f0000000600)={0x2c, &(0x7f00000003c0)={0x0, 0x0, 0x4, "eca77825"}, 0x0, 0x0, 0x0, 0x0}) (async)
panic: replaceArg: group fields don't match: 0/2

goroutine 14 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af31c0?}, {0xe56770?, 0xc000af3580?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af31a0?}, {0xe56770?, 0xc000af37e0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af3180?}, {0xe56770?, 0xc000af3800?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af3160?}, {0xe56770?, 0xc000af32c0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af3140?}, {0xe56770?, 0xc000af32a0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af3120?}, {0xe56770?, 0xc000af3280?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af3100?}, {0xe56770?, 0xc000af3260?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc000af30e0?}, {0xe56770?, 0xc000af3240?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d44a0, 0xc000af3200, 0xc00bfca6e0, {0xe56770, 0xc000af30c0?}, {0xc00bfca698, {0x1db72e0, 0x4, 0x4}, 0xc00bfcd320, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x418408?, 0xc00028a2e0?, 0xc000e77dc8?, {0xe56770, 0xc000af30c0}, {0xc00bfca698, {0x1db72e0, 0x4, 0x4}, 0xc00bfcd320, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc000e77e48)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00bfd4040, {0xe52aa8?, 0xc00139a0c0}, 0x1e, 0xc001298000, 0xc0000a3dd0, {0xc00132c000, 0x421, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).loop(0xc0012981c0)
	/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