WARNING: DATA RACE
Write at 0x00c0023829f2 by goroutine 1504:
  gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*endpoint).SetSockOpt()
      pkg/tcpip/transport/tcp/endpoint.go:1599 +0xe9c
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptIP()
      pkg/sentry/socket/netstack/netstack.go:2013 +0x184
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1548 +0x232
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1531 +0x6a0
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.SetSockOpt()
      pkg/sentry/syscalls/linux/sys_socket.go:541 +0x2fd
  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:258 +0x16a4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x320

DIAGNOSIS:
I0306 22:09:02.134584   20089 main.go:305] ***************************
I0306 22:09:02.134735   20089 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-2]
I0306 22:09:02.135013   20089 main.go:307] Version release-20200219.0-105-gb1576e533223
I0306 22:09:02.135142   20089 main.go:308] PID: 20089
I0306 22:09:02.135249   20089 main.go:309] UID: 0, GID: 0
I0306 22:09:02.135346   20089 main.go:310] Configuration:
I0306 22:09:02.135483   20089 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0306 22:09:02.135595   20089 main.go:312] 		Platform: ptrace
I0306 22:09:02.135709   20089 main.go:313] 		FileAccess: shared, overlay: false
I0306 22:09:02.135846   20089 main.go:314] 		Network: sandbox, logging: false
I0306 22:09:02.135978   20089 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0306 22:09:02.136112   20089 main.go:316] ***************************
W0306 22:09:02.136225   20089 main.go:321] Block the TERM signal. This is only safe in tests!
D0306 22:09:02.136527   20089 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0306 22:09:02.143536   20089 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0306 22:09:02.143756   20089 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0306 22:09:02.143914   20089 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0306 22:09:02.144356   20089 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0306 22:09:02.651007   20089 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 58944
I0306 22:09:02.651196   20089 debug.go:131] Retrieving sandbox stacks
D0306 22:09:02.651310   20089 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0306 22:09:02.651443   20089 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0306 22:09:02.651656   20089 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 58944: connection refused
retrieving stacks: connecting to control server at PID 58944: connection refused
W0306 22:09:02.652024   20089 main.go:338] Failure to execute command, err: 1