comzyh / clash

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x14 pc=0x4c4f14]

goroutine 80464 [running]:
github.com/Dreamacro/clash/adapters/inbound.NewSocket(0x2c21890, 0x7, 0x7, 0x830718, 0x29c9440, 0x9, 0x2c21890)
F:/projects/myclash3/adapters/inbound/socket.go:26 +0x60
github.com/Dreamacro/clash/proxy/tun.NewTunProxy.func1(0x3516510)
F:/projects/myclash3/proxy/tun/tunproxy.go:94 +0x190
created by gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*Forwarder).HandlePacket
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20200814151311-224de3a00460/pkg/tcpip/transport/tcp/forwarder.go:91 +0x200

有同样问题 ping @comzyh

同样问题，指定dns到本地smartdns稳定复现，换别的内核无此问题

最近更新了gvisor，我自己正在测。
https://github.com/comzyh/clash/tree/tun-dev
有兴趣可以试试

在mipsle平台上出现unaligned 64-bit atomic operation

goroutine 1 [running]:
runtime/internal/atomic.panicUnaligned(...)
F:/tools/go/src/runtime/internal/atomic/unaligned.go:8
runtime/internal/atomic.lockAndCheck(...)
F:/tools/go/src/runtime/internal/atomic/atomic_mipsx.go:37
runtime/internal/atomic.Store64(0x1681ad4, 0x100000, 0x0)
F:/tools/go/src/runtime/internal/atomic/atomic_mipsx.go:103 +0x94
gvisor.dev/gvisor/pkg/tcpip.(*SocketOptions).SetSendBufferSize(0x1681a68, 0x100000, 0x0, 0x0)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/socketops.go:607 +0x19c
gvisor.dev/gvisor/pkg/tcpip/transport/tcp.newEndpoint(0x14a7500, 0x800, 0x18d0260, 0x1440240)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/transport/tcp/endpoint.go:890 +0x200
gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*protocol).NewEndpoint(0x183c1a0, 0x800, 0x18d0260, 0x14c2cf8, 0x96b601, 0x16bf201, 0x18d0260)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/transport/tcp/protocol.go:165 +0x50
gvisor.dev/gvisor/pkg/tcpip/stack.(*Stack).NewEndpoint(0x14a7500, 0x6, 0x800, 0x18d0260, 0x0, 0x16bf290, 0xa53858, 0x8205d4)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/stack/stack.go:861 +0x90
gvisor.dev/gvisor/pkg/tcpip/adapters/gonet.ListenTCP(0x14a7500, 0x1, 0x0, 0x0, 0x35, 0x800, 0x0, 0x0, 0x0)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/adapters/gonet/gonet.go:70 +0x6c
github.com/Dreamacro/clash/proxy/tun.CreateDNSServer(0x14a7500, 0x14c2410, 0x18a01f0, 0x1a0a2e0, 0x10, 0x10, 0x35, 0x1, 0x0, 0x0, ...)
F:/projects/clash-tun/proxy/tun/tundns.go:175 +0x37c
github.com/Dreamacro/clash/proxy/tun.(*tunAdapter).ReCreateDNSServer(0x18a0310, 0x14c2410, 0x18a01f0, 0x14b5aa0, 0xa, 0x0, 0x0)
F:/projects/clash-tun/proxy/tun/tundns.go:263 +0x1ac
github.com/Dreamacro/clash/proxy.ReCreateTun(0x1, 0x14b5a80, 0xc, 0x14b5aa0, 0xa, 0x0, 0x0)
F:/projects/clash-tun/proxy/listener.go:311 +0x2c0
github.com/Dreamacro/clash/hub/executor.updateGeneral(0x14a3c70, 0x1)
F:/projects/clash-tun/hub/executor/executor.go:212 +0x1dc
github.com/Dreamacro/clash/hub/executor.ApplyConfig(0x1679400, 0xa52c01)
F:/projects/clash-tun/hub/executor/executor.go:74 +0xec
github.com/Dreamacro/clash/hub.Parse(0x0, 0x0, 0x0, 0x6, 0xfb67a0)
F:/projects/clash-tun/hub/hub.go:48 +0x110
main.main()
F:/projects/clash-tun/main.go:98 +0x3f8

seems 32bit processor can't access a 64bit value atomically if its address is not aligned at a multiple of 8.

比较难复现，有时候会一天内连续出现，有时候隔几个月也没问题。

看起来你们是在用 tun 的 DNS 是吗？

tun:
  enable: true
  stack: system
  device-url: dev://clash0
  dns-hijack:
    - 10.0.0.5


dns:
  enable: true
  listen: 0.0.0.0:53
  enhanced-mode: redir-host
  nameserver:

是的，10.0.0.5 是 PiHole

在mipsle平台上出现unaligned 64-bit atomic operation

goroutine 1 [running]:
runtime/internal/atomic.panicUnaligned(...)
F:/tools/go/src/runtime/internal/atomic/unaligned.go:8
runtime/internal/atomic.lockAndCheck(...)
F:/tools/go/src/runtime/internal/atomic/atomic_mipsx.go:37
runtime/internal/atomic.Store64(0x1681ad4, 0x100000, 0x0)
F:/tools/go/src/runtime/internal/atomic/atomic_mipsx.go:103 +0x94
gvisor.dev/gvisor/pkg/tcpip.(*SocketOptions).SetSendBufferSize(0x1681a68, 0x100000, 0x0, 0x0)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/socketops.go:607 +0x19c
gvisor.dev/gvisor/pkg/tcpip/transport/tcp.newEndpoint(0x14a7500, 0x800, 0x18d0260, 0x1440240)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/transport/tcp/endpoint.go:890 +0x200
gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*protocol).NewEndpoint(0x183c1a0, 0x800, 0x18d0260, 0x14c2cf8, 0x96b601, 0x16bf201, 0x18d0260)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/transport/tcp/protocol.go:165 +0x50
gvisor.dev/gvisor/pkg/tcpip/stack.(*Stack).NewEndpoint(0x14a7500, 0x6, 0x800, 0x18d0260, 0x0, 0x16bf290, 0xa53858, 0x8205d4)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/stack/stack.go:861 +0x90
gvisor.dev/gvisor/pkg/tcpip/adapters/gonet.ListenTCP(0x14a7500, 0x1, 0x0, 0x0, 0x35, 0x800, 0x0, 0x0, 0x0)
C:/Users/admin/go/pkg/mod/github.com/comzyh/gvisor@v0.0.0-20210301140817-31d323141418/pkg/tcpip/adapters/gonet/gonet.go:70 +0x6c
github.com/Dreamacro/clash/proxy/tun.CreateDNSServer(0x14a7500, 0x14c2410, 0x18a01f0, 0x1a0a2e0, 0x10, 0x10, 0x35, 0x1, 0x0, 0x0, ...)
F:/projects/clash-tun/proxy/tun/tundns.go:175 +0x37c
github.com/Dreamacro/clash/proxy/tun.(*tunAdapter).ReCreateDNSServer(0x18a0310, 0x14c2410, 0x18a01f0, 0x14b5aa0, 0xa, 0x0, 0x0)
F:/projects/clash-tun/proxy/tun/tundns.go:263 +0x1ac
github.com/Dreamacro/clash/proxy.ReCreateTun(0x1, 0x14b5a80, 0xc, 0x14b5aa0, 0xa, 0x0, 0x0)
F:/projects/clash-tun/proxy/listener.go:311 +0x2c0
github.com/Dreamacro/clash/hub/executor.updateGeneral(0x14a3c70, 0x1)
F:/projects/clash-tun/hub/executor/executor.go:212 +0x1dc
github.com/Dreamacro/clash/hub/executor.ApplyConfig(0x1679400, 0xa52c01)
F:/projects/clash-tun/hub/executor/executor.go:74 +0xec
github.com/Dreamacro/clash/hub.Parse(0x0, 0x0, 0x0, 0x6, 0xfb67a0)
F:/projects/clash-tun/hub/hub.go:48 +0x110
main.main()
F:/projects/clash-tun/main.go:98 +0x3f8

google/gvisor#5692
我想等他们修了这个直接用

定位在这行，conn.RemoteAddr() 可能返回空

clash/adapters/inbound/socket.go

Line 16 in c01080b

if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {

原因是
https://github.com/google/gvisor/blob/6b785c5e3d79cb32ce49dec2aa97bec8e9725409/pkg/tcpip/adapters/gonet/gonet.go#L444

// RemoteAddr implements net.Conn.RemoteAddr.
func (c *TCPConn) RemoteAddr() net.Addr {
	a, err := c.ep.GetRemoteAddress()
	if err != nil {
		return nil
	}
	return fullToTCPAddr(a)
}

这里c.ep.GetRemoteAddress() 可能返回异常，原因是tcp的GetRemoteAddress 在非Connected 的状态下会返回异常。

https://github.com/google/gvisor/blob/6b785c5e3d79cb32ce49dec2aa97bec8e9725409/pkg/tcpip/transport/tcp/endpoint.go#L2656

// GetRemoteAddress returns the address to which the endpoint is connected.
func (e *endpoint) GetRemoteAddress() (tcpip.FullAddress, tcpip.Error) {
	e.LockUser()
	defer e.UnlockUser()

	if !e.EndpointState().connected() {
		return tcpip.FullAddress{}, &tcpip.ErrNotConnected{}
	}

	return e.getRemoteAddress(), nil
}

9c7e536 应该能修复这个问题

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[Bug] 运行过程中经常出现panic