panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x98 pc=0x9c9f73]

goroutine 45 [running]:
encoding/gob.validUserType({0x0, 0x0})
	/usr/local/go/src/encoding/gob/type.go:64 +0xd3
encoding/gob.userType({0x0?, 0x0?})
	/usr/local/go/src/encoding/gob/type.go:154 +0x1d
encoding/gob.(*Encoder).sendType(0xc0006ccb40, {0xd9b760, 0xc00019e280}, 0xc00019e440, {0x0?, 0x0?})
	/usr/local/go/src/encoding/gob/encoder.go:136 +0x45
encoding/gob.(*Encoder).sendTypeDescriptor(0xc0006ccb40, {0xd9b760, 0xc00019e280}, 0xc00019e440, 0xc00019e400)
	/usr/local/go/src/encoding/gob/encoder.go:191 +0x9e
encoding/gob.(*Encoder).EncodeValue(0xc0006ccb40, {0xa98c40?, 0xc000079998?, 0x41173b?})
	/usr/local/go/src/encoding/gob/encoder.go:244 +0x390
encoding/gob.(*Encoder).Encode(0xa57bf6e86f472b74?, {0xa98c40?, 0xc000079998?})
	/usr/local/go/src/encoding/gob/encoder.go:176 +0x75
net/rpc.(*gobClientCodec).WriteRequest(0xc0001a0c60, 0xc0001a0c90?, {0xa95300, 0xc0006d20f0})
	/usr/local/go/src/net/rpc/client.go:218 +0x36
net/rpc.(*Client).send(0xc000079980, 0xc000619130)
	/usr/local/go/src/net/rpc/client.go:91 +0x224
net/rpc.(*Client).Go(0xc000079980, {0xc2b58b, 0x16}, {0xa95300, 0xc0006d20f0}, {0x0, 0x0}, 0x0)
	/usr/local/go/src/net/rpc/client.go:315 +0x13a
github.com/google/syzkaller/pkg/rpctype.(*RPCClient).AsyncCall(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/rpctype/rpc.go:92
main.(*FuzzerTool).startExecutingCall(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:268
main.(*Proc).executeProgram(0xc0000a2f18, {0x16ea, {0xc000767380, 0x197, 0x197}, {0x15, 0x4762, 0x0}, 0x1, 0x0, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:121 +0x12a
main.(*Proc).execute(0xc0000a2f18?, {0x16ea, {0xc000767380, 0x197, 0x197}, {0x15, 0x4762, 0x0}, 0x1, 0x0, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:99 +0x98
main.(*Proc).loop(0xc0000a2f18)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:50 +0x278
created by main.startProc in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:37 +0x10a


OpenBSD/amd64 (‘æjìòÔŠÏФʤ”8JüR…ꮯ:g”¶ÍÅï'OÿJ¤ÄÆU¹Àsž2$`çî‚ýúý›òr÷)ŽR‚JÊ×­ö¾‘xQZ#ÿÏØ) (tty00)

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x98 pc=0x9c9f73]

goroutine 47 [running]:
encoding/gob.validUserType({0x0, 0x0})
	/usr/local/go/src/encoding/gob/type.go:64 +0xd3
encoding/gob.userType({0x0?, 0x0?})
	/usr/local/go/src/encoding/gob/type.go:154 +0x1d
encoding/gob.(*Encoder).sendType(0xc0006ccb40, {0xd9b760, 0xc00019e280}, 0xc000017d00, {0x0?, 0x0?})
	/usr/local/go/src/encoding/gob/encoder.go:136 +0x45
encoding/gob.(*Encoder).sendTypeDescriptor(0xc0006ccb40, {0xd9b760, 0xc00019e280}, 0xc000017d00, 0xc00019e400)
	/usr/local/go/src/encoding/gob/encoder.go:191 +0x9e
encoding/gob.(*Encoder).EncodeValue(0xc0006ccb40, {0xa98c40?, 0xc000079998?, 0xc00087f9f0?})
	/usr/local/go/src/encoding/gob/encoder.go:244 +0x390
encoding/gob.(*Encoder).Encode(0xfaf3a16a0deea443?, {0xa98c40?, 0xc000079998?})
	/usr/local/go/src/encoding/gob/encoder.go:176 +0x75
net/rpc.(*gobClientCodec).WriteRequest(0xc0001a0c60, 0xc0001a0c90?, {0xa95280, 0xc000017cc0})
	/usr/local/go/src/net/rpc/client.go:218 +0x36
net/rpc.(*Client).send(0xc000079980, 0xc00047bbd0)
	/usr/local/go/src/net/rpc/client.go:91 +0x224
net/rpc.(*Client).Go(0xc000079980, {0xc29091, 0x14}, {0xa95280, 0xc000017cc0}, {0xa952c0, 0xc00047bb80}, 0xc000815bc0)
	/usr/local/go/src/net/rpc/client.go:315 +0x13a
net/rpc.(*Client).Call(...)
	/usr/local/go/src/net/rpc/client.go:321
github.com/google/syzkaller/pkg/rpctype.(*RPCClient).Call(0xc0000a29c0, {0xc29091, 0x14}, {0xa95280, 0xc000017cc0}, {0xa952c0, 0xc00047bb80})
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/rpctype/rpc.go:88 +0x145
main.(*FuzzerTool).exchangeDataCall(0xc0000356b0, {0xc0009454a0, 0x1, 0x1}, 0x77923f4)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:287 +0x216
main.(*FuzzerTool).exchangeDataWorker(0xc0000356b0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:327 +0x76
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:213 +0x12fd
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