WARNING: DATA RACE
Read at 0x00c00056c490 by goroutine 352:
  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 +0x455
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:291 +0xb4
DIAGNOSIS:
I0227 11:56:46.066532   64459 main.go:296] ***************************
I0227 11:56:46.066691   64459 main.go:297] 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]
I0227 11:56:46.066930   64459 main.go:298] Version release-20200219.0-47-gde0b2ebf8635
I0227 11:56:46.067029   64459 main.go:299] PID: 64459
I0227 11:56:46.067149   64459 main.go:300] UID: 0, GID: 0
I0227 11:56:46.067256   64459 main.go:301] Configuration:
I0227 11:56:46.067337   64459 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0227 11:56:46.067428   64459 main.go:303] 		Platform: ptrace
I0227 11:56:46.067529   64459 main.go:304] 		FileAccess: shared, overlay: false
I0227 11:56:46.067616   64459 main.go:305] 		Network: sandbox, logging: false
I0227 11:56:46.067706   64459 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0227 11:56:46.067824   64459 main.go:307] ***************************
W0227 11:56:46.067939   64459 main.go:312] Block the TERM signal. This is only safe in tests!
D0227 11:56:46.068150   64459 container.go:158] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.075502   64459 container.go:591] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0227 11:56:46.075674   64459 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.075862   64459 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.076361   64459 urpc.go:534] urpc: successfully marshalled 117 bytes.
W0227 11:56:46.137953   64459 error.go:48] FATAL ERROR: container sandbox is not running
container sandbox is not running
W0227 11:56:46.138280   64459 main.go:329] 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-2"]: exit status 128
I0227 11:56:46.066532   64459 main.go:296] ***************************
I0227 11:56:46.066691   64459 main.go:297] 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]
I0227 11:56:46.066930   64459 main.go:298] Version release-20200219.0-47-gde0b2ebf8635
I0227 11:56:46.067029   64459 main.go:299] PID: 64459
I0227 11:56:46.067149   64459 main.go:300] UID: 0, GID: 0
I0227 11:56:46.067256   64459 main.go:301] Configuration:
I0227 11:56:46.067337   64459 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0227 11:56:46.067428   64459 main.go:303] 		Platform: ptrace
I0227 11:56:46.067529   64459 main.go:304] 		FileAccess: shared, overlay: false
I0227 11:56:46.067616   64459 main.go:305] 		Network: sandbox, logging: false
I0227 11:56:46.067706   64459 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0227 11:56:46.067824   64459 main.go:307] ***************************
W0227 11:56:46.067939   64459 main.go:312] Block the TERM signal. This is only safe in tests!
D0227 11:56:46.068150   64459 container.go:158] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.075502   64459 container.go:591] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0227 11:56:46.075674   64459 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.075862   64459 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 11:56:46.076361   64459 urpc.go:534] urpc: successfully marshalled 117 bytes.
W0227 11:56:46.137953   64459 error.go:48] FATAL ERROR: container sandbox is not running
container sandbox is not running
W0227 11:56:46.138280   64459 main.go:329] Failure to execute command, err: 1
  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 +0x1aaf
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x308