WARNING: DATA RACE
Write at 0x00c001ef70fa by goroutine 1506:
  gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).SetSockOptBool()
      pkg/tcpip/transport/udp/endpoint.go:533 +0x2fd
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptIPv6()
      pkg/sentry/socket/netstack/netstack.go:1815 +0x282
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt()
      pkg/sentry/socket/netstack/netstack.go:1541 +0x3b3
  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
DIAGNOSIS:
I0305 13:16:49.583058   40370 main.go:305] ***************************
I0305 13:16:49.583257   40370 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]
I0305 13:16:49.583402   40370 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0305 13:16:49.583468   40370 main.go:308] PID: 40370
I0305 13:16:49.583565   40370 main.go:309] UID: 0, GID: 0
I0305 13:16:49.583625   40370 main.go:310] Configuration:
I0305 13:16:49.583694   40370 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0305 13:16:49.583756   40370 main.go:312] 		Platform: ptrace
I0305 13:16:49.583844   40370 main.go:313] 		FileAccess: shared, overlay: false
I0305 13:16:49.584037   40370 main.go:314] 		Network: sandbox, logging: false
I0305 13:16:49.584146   40370 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0305 13:16:49.584278   40370 main.go:316] ***************************
W0305 13:16:49.584364   40370 main.go:321] Block the TERM signal. This is only safe in tests!
D0305 13:16:49.584657   40370 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.591655   40370 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0305 13:16:49.591823   40370 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.591960   40370 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.592458   40370 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0305 13:16:51.569801   40370 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 20690
I0305 13:16:51.569971   40370 debug.go:131] Retrieving sandbox stacks
D0305 13:16:51.570100   40370 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:51.570214   40370 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0305 13:16:51.570402   40370 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 20690: connection refused
retrieving stacks: connecting to control server at PID 20690: connection refused
W0305 13:16:51.570724   40370 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-0"]: exit status 128
I0305 13:16:49.583058   40370 main.go:305] ***************************
I0305 13:16:49.583257   40370 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]
I0305 13:16:49.583402   40370 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0305 13:16:49.583468   40370 main.go:308] PID: 40370
I0305 13:16:49.583565   40370 main.go:309] UID: 0, GID: 0
I0305 13:16:49.583625   40370 main.go:310] Configuration:
I0305 13:16:49.583694   40370 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0305 13:16:49.583756   40370 main.go:312] 		Platform: ptrace
I0305 13:16:49.583844   40370 main.go:313] 		FileAccess: shared, overlay: false
I0305 13:16:49.584037   40370 main.go:314] 		Network: sandbox, logging: false
I0305 13:16:49.584146   40370 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0305 13:16:49.584278   40370 main.go:316] ***************************
W0305 13:16:49.584364   40370 main.go:321] Block the TERM signal. This is only safe in tests!
D0305 13:16:49.584657   40370 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.591655   40370 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0305 13:16:49.591823   40370 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.591960   40370 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:49.592458   40370 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0305 13:16:51.569801   40370 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 20690
I0305 13:16:51.569971   40370 debug.go:131] Retrieving sandbox stacks
D0305 13:16:51.570100   40370 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 13:16:51.570214   40370 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0305 13:16:51.570402   40370 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 20690: connection refused
retrieving stacks: connecting to control server at PID 20690: connection refused
W0305 13:16:51.570724   40370 main.go:338] Failure to execute command, err: 1
13:16:49 executing program 0:
mkdir(&(0x7f0000000140)='./file0\x00', 0x0)
unlinkat(0xffffffffffffff9c, &(0x7f0000000100)='./file0\x00', 0x200)