WARNING: DATA RACE
Read at 0x00c0008cc250 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
DIAGNOSIS:
I0228 11:38:30.747426   11610 main.go:296] ***************************
I0228 11:38:30.747546   11610 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-1]
I0228 11:38:30.747696   11610 main.go:298] Version release-20200219.0-63-gc96bb4d2ebc6
I0228 11:38:30.747771   11610 main.go:299] PID: 11610
I0228 11:38:30.747837   11610 main.go:300] UID: 0, GID: 0
I0228 11:38:30.747930   11610 main.go:301] Configuration:
I0228 11:38:30.748000   11610 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0228 11:38:30.748092   11610 main.go:303] 		Platform: ptrace
I0228 11:38:30.748163   11610 main.go:304] 		FileAccess: shared, overlay: false
I0228 11:38:30.748393   11610 main.go:305] 		Network: sandbox, logging: false
I0228 11:38:30.748496   11610 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0228 11:38:30.748622   11610 main.go:307] ***************************
W0228 11:38:30.748691   11610 main.go:312] Block the TERM signal. This is only safe in tests!
D0228 11:38:30.748836   11610 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.754895   11610 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0228 11:38:30.755115   11610 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.755240   11610 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.755730   11610 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0228 11:38:30.830906   11610 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 64421
I0228 11:38:30.831044   11610 debug.go:131] Retrieving sandbox stacks
D0228 11:38:30.831126   11610 sandbox.go:906] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.831224   11610 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0228 11:38:30.831377   11610 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 64421: connection refused
retrieving stacks: connecting to control server at PID 64421: connection refused
W0228 11:38:30.831630   11610 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-1"]: exit status 128
I0228 11:38:30.747426   11610 main.go:296] ***************************
I0228 11:38:30.747546   11610 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-1]
I0228 11:38:30.747696   11610 main.go:298] Version release-20200219.0-63-gc96bb4d2ebc6
I0228 11:38:30.747771   11610 main.go:299] PID: 11610
I0228 11:38:30.747837   11610 main.go:300] UID: 0, GID: 0
I0228 11:38:30.747930   11610 main.go:301] Configuration:
I0228 11:38:30.748000   11610 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0228 11:38:30.748092   11610 main.go:303] 		Platform: ptrace
I0228 11:38:30.748163   11610 main.go:304] 		FileAccess: shared, overlay: false
I0228 11:38:30.748393   11610 main.go:305] 		Network: sandbox, logging: false
I0228 11:38:30.748496   11610 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0228 11:38:30.748622   11610 main.go:307] ***************************
W0228 11:38:30.748691   11610 main.go:312] Block the TERM signal. This is only safe in tests!
D0228 11:38:30.748836   11610 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.754895   11610 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0228 11:38:30.755115   11610 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.755240   11610 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.755730   11610 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0228 11:38:30.830906   11610 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 64421
I0228 11:38:30.831044   11610 debug.go:131] Retrieving sandbox stacks
D0228 11:38:30.831126   11610 sandbox.go:906] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0228 11:38:30.831224   11610 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0228 11:38:30.831377   11610 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 64421: connection refused
retrieving stacks: connecting to control server at PID 64421: connection refused
W0228 11:38:30.831630   11610 main.go:329] Failure to execute command, err: 1
  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
  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