WARNING: DATA RACE
Write at 0x00c0001f4750 by goroutine 370:
  gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*endpoint).SetSockOpt()
      pkg/tcpip/transport/tcp/endpoint.go:1510 +0xda7
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptIP()
      pkg/sentry/socket/netstack/netstack.go:1999 +0x3c4
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1544 +0x232
DIAGNOSIS:
I0303 02:19:39.246835    7703 main.go:305] ***************************
I0303 02:19:39.247051    7703 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-1]
I0303 02:19:39.247284    7703 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 02:19:39.247434    7703 main.go:308] PID: 7703
I0303 02:19:39.247539    7703 main.go:309] UID: 0, GID: 0
I0303 02:19:39.247641    7703 main.go:310] Configuration:
I0303 02:19:39.247739    7703 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 02:19:39.247893    7703 main.go:312] 		Platform: ptrace
I0303 02:19:39.248149    7703 main.go:313] 		FileAccess: shared, overlay: false
I0303 02:19:39.248338    7703 main.go:314] 		Network: sandbox, logging: false
I0303 02:19:39.248500    7703 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 02:19:39.248646    7703 main.go:316] ***************************
W0303 02:19:39.248753    7703 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 02:19:39.249007    7703 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.263431    7703 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0303 02:19:39.263664    7703 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.263806    7703 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.264430    7703 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 02:19:39.356128    7703 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 2043
I0303 02:19:39.356319    7703 debug.go:131] Retrieving sandbox stacks
D0303 02:19:39.356499    7703 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.356684    7703 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0303 02:19:39.356943    7703 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 2043: connection refused
retrieving stacks: connecting to control server at PID 2043: connection refused
W0303 02:19:39.357387    7703 main.go:338] Failure to execute command, err: 1


Error collecting stacks: failed to run ["/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-1"]: exit status 128
I0303 02:19:39.246835    7703 main.go:305] ***************************
I0303 02:19:39.247051    7703 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-1]
I0303 02:19:39.247284    7703 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 02:19:39.247434    7703 main.go:308] PID: 7703
I0303 02:19:39.247539    7703 main.go:309] UID: 0, GID: 0
I0303 02:19:39.247641    7703 main.go:310] Configuration:
I0303 02:19:39.247739    7703 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 02:19:39.247893    7703 main.go:312] 		Platform: ptrace
I0303 02:19:39.248149    7703 main.go:313] 		FileAccess: shared, overlay: false
I0303 02:19:39.248338    7703 main.go:314] 		Network: sandbox, logging: false
I0303 02:19:39.248500    7703 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 02:19:39.248646    7703 main.go:316] ***************************
W0303 02:19:39.248753    7703 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 02:19:39.249007    7703 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.263431    7703 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0303 02:19:39.263664    7703 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.263806    7703 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.264430    7703 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 02:19:39.356128    7703 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 2043
I0303 02:19:39.356319    7703 debug.go:131] Retrieving sandbox stacks
D0303 02:19:39.356499    7703 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 02:19:39.356684    7703 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0303 02:19:39.356943    7703 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 2043: connection refused
retrieving stacks: connecting to control server at PID 2043: connection refused
W0303 02:19:39.357387    7703 main.go:338] Failure to execute command, err: 1
  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