WARNING: DATA RACE
Read at 0x00c00622d210 by goroutine 2508:
  gvisor.dev/gvisor/pkg/tcpip/stack.(*TransportEndpointInfo).AddrNetProto()
      pkg/tcpip/stack/stack.go:573 +0x79
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).checkV4Mapped()
      pkg/tcpip/transport/udp/endpoint.go:931 +0xee
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Connect()
      pkg/tcpip/transport/udp/endpoint.go:984 +0x6c
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).Connect()
      pkg/sentry/socket/netstack/netstack.go:698 +0x4c5
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Connect()
      pkg/sentry/syscalls/linux/sys_socket.go:280 +0x251
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:170 +0x44d
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:291 +0xb4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:252 +0x109
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:227 +0x1b3
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:232 +0x1aaa
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x320

Previous write at 0x00c00622d210 by goroutine 2146:
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).bindLocked()
      pkg/tcpip/transport/udp/endpoint.go:1176 +0x27c
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).prepareForWrite()
      pkg/tcpip/transport/udp/endpoint.go:323 +0x26d
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).write()
      pkg/tcpip/transport/udp/endpoint.go:400 +0x12b
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Write()
      pkg/tcpip/transport/udp/endpoint.go:360 +0x81
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).SendMsg()
      pkg/sentry/socket/netstack/netstack.go:2593 +0x1d5
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.sendSingleMsg()
      pkg/sentry/syscalls/linux/sys_socket.go:1055 +0x489
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.SendMMsg()
      pkg/sentry/syscalls/linux/sys_socket.go:979 +0x300
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:170 +0x44d
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:291 +0xb4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:252 +0x109
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:227 +0x1b3
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:232 +0x1aaa
DIAGNOSIS:
I0303 09:41:53.017455   17843 main.go:305] ***************************
I0303 09:41:53.017610   17843 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-3]
I0303 09:41:53.017886   17843 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 09:41:53.018000   17843 main.go:308] PID: 17843
I0303 09:41:53.018115   17843 main.go:309] UID: 0, GID: 0
I0303 09:41:53.018248   17843 main.go:310] Configuration:
I0303 09:41:53.018386   17843 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 09:41:53.018522   17843 main.go:312] 		Platform: ptrace
I0303 09:41:53.018609   17843 main.go:313] 		FileAccess: shared, overlay: false
I0303 09:41:53.018727   17843 main.go:314] 		Network: sandbox, logging: false
I0303 09:41:53.018934   17843 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 09:41:53.019064   17843 main.go:316] ***************************
W0303 09:41:53.019179   17843 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 09:41:53.019393   17843 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 09:41:53.028071   17843 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0303 09:41:53.028234   17843 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 09:41:53.028321   17843 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 09:41:53.028799   17843 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 09:41:53.872152   17843 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 56800
I0303 09:41:53.872371   17843 debug.go:131] Retrieving sandbox stacks
D0303 09:41:53.872490   17843 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 09:41:53.872627   17843 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0303 09:41:53.872965   17843 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 56800: connection refused
retrieving stacks: connecting to control server at PID 56800: connection refused
W0303 09:41:53.873339   17843 main.go:338] Failure to execute command, err: 1