panic: runtime error: index out of range [300252880] with length 992

goroutine 48 [running]:
github.com/google/syzkaller/prog.ArgCommon.Type(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:71
github.com/google/syzkaller/prog.(*serializer).call(0xc0006e3650, 0xc00062ec80)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/encoding.go:76 +0x1aa
github.com/google/syzkaller/prog.(*Prog).serialize(0xc0004e7ec0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/encoding.go:46 +0xd8
github.com/google/syzkaller/prog.(*Prog).Serialize(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/encoding.go:30
main.(*Proc).logProgram(0xc0002000a0, 0xc0004e7ec0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:130 +0x4e
main.(*Proc).executeRaw(0xc0002000a0, 0xc0007ebef0, 0xc0004e7ec0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:101 +0x125
main.(*Proc).loop(0xc0002000a0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:65 +0x148
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:256 +0x1145