WARNING: DATA RACE
Read at 0x00c0004e0380 by goroutine 420:
  runtime.slicecopy()
      GOROOT/src/runtime/slice.go:246 +0x0
  gvisor.dev/gvisor/pkg/safemem.Copy()
      pkg/safemem/block_unsafe.go:199 +0x4e4
  gvisor.dev/gvisor/pkg/safemem.CopySeq()
      pkg/safemem/seq_unsafe.go:281 +0x2a4
  gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).CopyOut.func1()
      pkg/sentry/mm/io.go:120 +0xaf
  gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).withInternalMappings()
      pkg/sentry/mm/io.go:506 +0x8d2
  gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).CopyOut()
      pkg/sentry/mm/io.go:119 +0x264
  gvisor.dev/gvisor/pkg/usermem.CopyOutVec()
      pkg/usermem/usermem.go:262 +0x1f5
  gvisor.dev/gvisor/pkg/usermem.IOSequence.CopyOut()
      pkg/usermem/usermem.go:480 +0x15b
  gvisor.dev/gvisor/pkg/usermem.(*ioSequenceReadWriter).Write()
      pkg/usermem/usermem.go:552 +0x45
  gvisor.dev/gvisor/pkg/tcpip/buffer.(*VectorisedView).ReadTo()
      pkg/tcpip/buffer/view.go:156 +0xe2
  gvisor.dev/gvisor/pkg/tcpip/transport/packet.(*endpoint).Read()
      pkg/tcpip/transport/packet/endpoint.go:202 +0x2ba
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).nonBlockingRead()
      pkg/sentry/socket/netstack/netstack.go:2594 +0x2d5
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).RecvMsg()
      pkg/sentry/socket/netstack/netstack.go:2782 +0x717
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketVFS2).RecvMsg()
      <autogenerated>:1 +0x149
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.recvFrom()
      pkg/sentry/syscalls/linux/vfs2/socket.go:867 +0x366
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.RecvFrom()
      pkg/sentry/syscalls/linux/vfs2/socket.go:892 +0x88
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:104 +0x452
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:239 +0xb9
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:199 +0x10e
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:174 +0x1e9
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:282 +0x12a6
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x397

Previous write at 0x00c0004e0384 by goroutine 422:
  encoding/binary.bigEndian.PutUint16()
      GOROOT/src/encoding/binary/binary.go:107 +0x27d
  gvisor.dev/gvisor/pkg/tcpip/header.IGMP.SetChecksum()
      pkg/tcpip/header/igmp.go:127 +0x25e
  gvisor.dev/gvisor/pkg/tcpip/network/ipv4.(*igmpState).handleIGMP()
      pkg/tcpip/network/ipv4/igmp.go:165 +0x253
  gvisor.dev/gvisor/pkg/tcpip/network/ipv4.(*endpoint).handlePacket()
      pkg/tcpip/network/ipv4/ipv4.go:776 +0xb2e
  gvisor.dev/gvisor/pkg/tcpip/network/ipv4.(*endpoint).HandlePacket()
      pkg/tcpip/network/ipv4/ipv4.go:622 +0x116
  gvisor.dev/gvisor/pkg/tcpip/stack.(*NIC).DeliverNetworkPacket()
      pkg/tcpip/stack/nic.go:747 +0x527
  gvisor.dev/gvisor/pkg/tcpip/link/channel.(*Endpoint).InjectLinkAddr()
      pkg/tcpip/link/channel/channel.go:190 +0x5d9
  gvisor.dev/gvisor/pkg/tcpip/link/tun.(*Device).Write()
      pkg/tcpip/link/tun/device.go:223 +0x2d6
  gvisor.dev/gvisor/pkg/sentry/devices/tundev.(*tunFD).Write()
      pkg/sentry/devices/tundev/tundev.go:146 +0x22a
  gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Write()
      pkg/sentry/vfs/file_description.go:630 +0x130
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.write()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:364 +0xed
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Write()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:333 +0x2a4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:104 +0x452
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:239 +0xb9
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:199 +0x10e
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:174 +0x1e9
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:282 +0x12a6
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x397