WARNING: DATA RACE
Write at 0x00c000b0e2a0 by goroutine 344:
  gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*endpoint).SetSockOpt()
      pkg/tcpip/transport/tcp/endpoint.go:1503 +0x34e
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptTCP()
      pkg/sentry/socket/netstack/netstack.go:1735 +0x35d
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1538 +0x30f
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1527 +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:232 +0x1aaa
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x320

DIAGNOSIS:
I0301 21:08:55.104640   23190 main.go:305] ***************************
I0301 21:08:55.104818   23190 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-0]
I0301 21:08:55.104968   23190 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0301 21:08:55.105064   23190 main.go:308] PID: 23190
I0301 21:08:55.105216   23190 main.go:309] UID: 0, GID: 0
I0301 21:08:55.105343   23190 main.go:310] Configuration:
I0301 21:08:55.105462   23190 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0301 21:08:55.105547   23190 main.go:312] 		Platform: ptrace
I0301 21:08:55.105635   23190 main.go:313] 		FileAccess: shared, overlay: false
I0301 21:08:55.105756   23190 main.go:314] 		Network: sandbox, logging: false
I0301 21:08:55.105861   23190 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0301 21:08:55.105956   23190 main.go:316] ***************************
W0301 21:08:55.106058   23190 main.go:321] Block the TERM signal. This is only safe in tests!
D0301 21:08:55.106244   23190 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0301 21:08:55.114009   23190 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0301 21:08:55.114216   23190 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0301 21:08:55.114326   23190 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0301 21:08:55.114835   23190 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0301 21:08:55.200283   23190 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 15635
I0301 21:08:55.200531   23190 debug.go:131] Retrieving sandbox stacks
D0301 21:08:55.200630   23190 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0301 21:08:55.200778   23190 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0301 21:08:55.201039   23190 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 15635: connection refused
retrieving stacks: connecting to control server at PID 15635: connection refused
W0301 21:08:55.201516   23190 main.go:338] Failure to execute command, err: 1