WARNING: DATA RACE
Write at 0x00c0018ce920 by goroutine 2248:
  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
DIAGNOSIS:
I0303 14:16:50.113056   54477 main.go:305] ***************************
I0303 14:16:50.113288   54477 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 14:16:50.113584   54477 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 14:16:50.113710   54477 main.go:308] PID: 54477
I0303 14:16:50.113864   54477 main.go:309] UID: 0, GID: 0
I0303 14:16:50.114014   54477 main.go:310] Configuration:
I0303 14:16:50.114136   54477 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 14:16:50.114221   54477 main.go:312] 		Platform: ptrace
I0303 14:16:50.114400   54477 main.go:313] 		FileAccess: shared, overlay: false
I0303 14:16:50.114593   54477 main.go:314] 		Network: sandbox, logging: false
I0303 14:16:50.114699   54477 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 14:16:50.114829   54477 main.go:316] ***************************
W0303 14:16:50.114952   54477 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 14:16:50.115195   54477 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.126534   54477 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0303 14:16:50.126719   54477 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.126860   54477 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.127392   54477 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 14:16:52.437422   54477 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 19954
I0303 14:16:52.437580   54477 debug.go:131] Retrieving sandbox stacks
D0303 14:16:52.437676   54477 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:52.437839   54477 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0303 14:16:52.438078   54477 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 19954: connection refused
retrieving stacks: connecting to control server at PID 19954: connection refused
W0303 14:16:52.438795   54477 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 14:16:50.113056   54477 main.go:305] ***************************
I0303 14:16:50.113288   54477 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 14:16:50.113584   54477 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 14:16:50.113710   54477 main.go:308] PID: 54477
I0303 14:16:50.113864   54477 main.go:309] UID: 0, GID: 0
I0303 14:16:50.114014   54477 main.go:310] Configuration:
I0303 14:16:50.114136   54477 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 14:16:50.114221   54477 main.go:312] 		Platform: ptrace
I0303 14:16:50.114400   54477 main.go:313] 		FileAccess: shared, overlay: false
I0303 14:16:50.114593   54477 main.go:314] 		Network: sandbox, logging: false
I0303 14:16:50.114699   54477 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 14:16:50.114829   54477 main.go:316] ***************************
W0303 14:16:50.114952   54477 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 14:16:50.115195   54477 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.126534   54477 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0303 14:16:50.126719   54477 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.126860   54477 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:50.127392   54477 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 14:16:52.437422   54477 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 19954
I0303 14:16:52.437580   54477 debug.go:131] Retrieving sandbox stacks
D0303 14:16:52.437676   54477 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0303 14:16:52.437839   54477 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0303 14:16:52.438078   54477 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 19954: connection refused
retrieving stacks: connecting to control server at PID 19954: connection refused
W0303 14:16:52.438795   54477 main.go:338] Failure to execute command, err: 1
  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