server panic: runtime error: invalid memory address or nil pointer dereference on shadowsocks protocol, websocket transportation

[peter-tank]

• Cross compiled for linux amd64 from aarch64 android termux.

• go version

  go version go1.12.7 android/arm64

• V2Ray 4.20.0 (user) 20190716-173952 A unified platform for anti-censorship.

• client: shadowsocks outbound, websocket transportation, method: chacha20-ietf

• server panic

  panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x9f373a] goroutine 71791 [running]: v2ray.com/core/proxy/shadowsocks.(Server).handleConnection(0xc0002b0d80, 0xdd0340, 0xc000f04480, 0xdd7980, 0xc000f044b0, 0xdd0f40, 0xc0001f65a0, 0x30, 0xc6b300) /data/data/com.termux/files/home/golang/src/v2ray.com/core/proxy/shadowsocks/server.go:167 +0x2ba v2ray.com/core/proxy/shadowsocks.(Server).Process(0xc0002b0d80, 0xdd0340, 0xc000f04480, 0x2, 0xdd7980, 0xc000f044b0, 0xdd0f40, 0xc0001f65a0, 0x7f1b0f459008, 0x408a1c) /data/data/com.termux/files/home/golang/src/v2ray.com/core/proxy/shadowsocks/server.go:66 +0x255 v2ray.com/core/app/proxyman/inbound.(tcpWorker).callback(0xc0000ed7a0, 0xdd7980, 0xc000f044b0) /data/data/com.termux/files/home/golang/src/v2ray.com/core/app/proxyman/inbound/worker.go:97 +0x47b created by v2ray.com/core/app/proxyman/inbound.(tcpWorker).Start.func1 /data/data/com.termux/files/home/golang/src/v2ray.com/core/app/proxyman/inbound/worker.go:113 +0x52

[peter-tank]

Not reproducible on recent builds(20190909) for days, assumming fixed by: MODs in: shadowsocks.(*Server).handleConnection _nil_read_onIV

rejected v2ray.com/core/proxy/shadowsocks: failed to read IV > websocket: close 1006 (abnormal closure): unexpected EOF

rejected v2ray.com/core/proxy/shadowsocks: failed to read IV > read tcp 127.0.0.1:xxxx->172.xx.xx.xxx:37972: i/o timeout