reflect: call of reflect.Value.Int on ptr

PrinnyQ · 2017-08-20 15:30:20 · 1511 次点击

服务器运行几个月了，最近突然panic在rpc的gob encode函数中，应用层逻辑很简单，所以暂时不太清楚是哪里的问题，正在学习go的rpc源码和gob编码的源码。panic信息如下：

panic: reflect: call of reflect.Value.Int on ptr Value [recovered]
    panic: reflect: call of reflect.Value.Int on ptr Value
goroutine 52598456 [running]:
encoding/gob.catchError(0xc4209e10d0)
    /root/go/src/encoding/gob/error.go:38 +0x95
panic(0xc40860, 0xc42606ad00)
    /root/go/src/runtime/panic.go:489 +0x2cf
reflect.Value.Int(0xbcdec0, 0xc4251fe520, 0x196, 0x196)
    /root/go/src/reflect/value.go:902 +0xb5
encoding/gob.encInt(0xc423ab4ae0, 0xc422da1e40, 0xbcdec0, 0xc4251fe520, 0x196)
    /root/go/src/encoding/gob/encode.go:188 +0x43
encoding/gob.(*Encoder).encodeStruct(0xc4209e1040, 0xc4209e1078, 0xc421a28a20, 0xcc1be0, 0xc4251fe510, 0x199)
    /root/go/src/encoding/gob/encode.go:334 +0x256
encoding/gob.(*Encoder).encode(0xc4209e1040, 0xc4209e1078, 0xcc1be0, 0xc4251fe510, 0x199, 0xc4209c3480)
    /root/go/src/encoding/gob/encode.go:707 +0x1d3
encoding/gob.(*Encoder).EncodeValue(0xc4209e1040, 0xc95bc0, 0xc4251fe510, 0x16, 0x0, 0x0)
    /root/go/src/encoding/gob/encoder.go:250 +0x3ab
encoding/gob.(*Encoder).Encode(0xc4209e1040, 0xc95bc0, 0xc4251fe510, 0x0, 0x0)
    /root/go/src/encoding/gob/encoder.go:175 +0x61
net/rpc.(*gobServerCodec).WriteResponse(0xc422b51ec0, 0xc422d737d0, 0xc95bc0, 0xc4251fe510, 0xc422b43a40, 0xc422b4a350)
    /root/go/src/net/rpc/server.go:424 +0x1dd
net/rpc.(*Server).sendResponse(0xc420055680, 0xc422b45aa0, 0xc421c4ff00, 0xc95bc0, 0xc4251fe510, 0x1334ac0, 0xc422b51ec0, 0x0, 0x0)
    /root/go/src/net/rpc/server.go:366 +0x130
net/rpc.(*service).call(0xc422afe900, 0xc420055680, 0xc422b45aa0, 0xc422b4ec00, 0xc421c4ff00, 0xbc3800, 0xc427ab07e0, 0x16, 0xc95bc0, 0xc4251fe510, ...)
    /root/go/src/net/rpc/server.go:394 +0x22e
created by net/rpc.(*Server).ServeCodec
    /root/go/src/net/rpc/server.go:481 +0x404

源码大致如下：

type RpcArgs struct{
    A string
    B int32
    C string
    D int32
    E String
    F int32 
    G int32
    H int32 
    I bool
    J string
    K int32
    L String
    M int32 
    N int32
    O int32 
    P bool
}
func RPC1(args *RpcArgs, reply *int){
    //some simple logic
    ....
    //do another async rpc call,and then painc in gob encode
    rpc.Client.Go(serviceMethod, args, reply, make(chan *rpc.Call, 1))
}