WARNING: DATA RACE
Read at 0x00c0010da890 by goroutine 115:
  gvisor.dev/gvisor/pkg/sentry/fs/tty.(*queue).readableSize()
      pkg/sentry/fs/tty/queue.go:90 +0xac
  gvisor.dev/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).Ioctl()
      pkg/sentry/fs/tty/line_discipline.go:182 +0xf73
DIAGNOSIS:
I0116 15:12:17.792139   14441 x:0] ***************************
I0116 15:12:17.792204   14441 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host-race/current/image -root /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-race-2]
I0116 15:12:17.792382   14441 x:0] Version release-20200115.0-4-ga7a1f00425c6
I0116 15:12:17.792439   14441 x:0] PID: 14441
I0116 15:12:17.792503   14441 x:0] UID: 0, GID: 0
I0116 15:12:17.792575   14441 x:0] Configuration:
I0116 15:12:17.792626   14441 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root
I0116 15:12:17.792685   14441 x:0] 		Platform: ptrace
I0116 15:12:17.792759   14441 x:0] 		FileAccess: exclusive, overlay: true
I0116 15:12:17.792831   14441 x:0] 		Network: host, logging: false
I0116 15:12:17.792909   14441 x:0] 		Strace: false, max size: 1024, syscalls: []
I0116 15:12:17.792990   14441 x:0] ***************************
W0116 15:12:17.793041   14441 x:0] Block the TERM signal. This is only safe in tests!
D0116 15:12:17.796622   14441 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0116 15:12:17.812174   14441 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-race-2": signal 0
D0116 15:12:17.812272   14441 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0116 15:12:17.812335   14441 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0116 15:12:17.813717   14441 x:0] urpc: successfully marshalled 123 bytes.
D0116 15:12:17.856358   14441 x:0] urpc: unmarshal success.
I0116 15:12:17.857163   14441 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2", PID: 46519
I0116 15:12:17.857262   14441 x:0] Retrieving sandbox stacks
D0116 15:12:17.857328   14441 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0116 15:12:17.857390   14441 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0116 15:12:17.857926   14441 x:0] urpc: successfully marshalled 36 bytes.
D0116 15:12:18.453427   14441 x:0] urpc: unmarshal success.
I0116 15:12:18.454569   14441 x:0]      *** Stack dump ***
goroutine 518212 [running]:
gvisor.dev/gvisor/pkg/log.Stacks(0x461301, 0xc000305140, 0xc0024f99e0, 0xc002299180)
	pkg/log/log.go:272 +0xb6
gvisor.dev/gvisor/runsc/boot.(*debug).Stacks(0x248f7a8, 0x248f7a8, 0xc001351250, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc000305140, 0xc00032e1d0, 0x13, 0x127f4ea, 0x4, 0xc0023a3e78, 0x3, 0x3, 0x10e2101, 0xc001351250, ...)
	GOROOT/src/reflect/value.go:460 +0x62b
reflect.Value.Call(0xc000305140, 0xc00032e1d0, 0x13, 0xc0023a3e78, 0x3, 0x3, 0x0, 0x248f7a8, 0x16)
	GOROOT/src/reflect/value.go:321 +0xd4
gvisor.dev/gvisor/pkg/urpc.(*Server).handleOne(0xc0002fcdb0, 0xc0035be780, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x688
gvisor.dev/gvisor/pkg/urpc.(*Server).handleRegistered(0xc0002fcdb0, 0xc0035be780, 0xc000429040, 0xc0019ab8c0)
	pkg/urpc/urpc.go:420 +0x43
gvisor.dev/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc0002fcdb0, 0xc0035be780)
	pkg/urpc/urpc.go:440 +0x81
created by gvisor.dev/gvisor/pkg/urpc.(*Server).StartHandling
	pkg/urpc/urpc.go:438 +0x6f

goroutine 1 [semacquire, 15 minutes]:
sync.runtime_Semacquire(0xc000344124)
	GOROOT/src/runtime/sema.go:56 +0x42
sync.(*WaitGroup).Wait(0xc000344124)
	GOROOT/src/sync/waitgroup.go:130 +0xb1
gvisor.dev/gvisor/pkg/sentry/kernel.(*Kernel).WaitExited(...)
	pkg/sentry/kernel/kernel.go:1061
gvisor.dev/gvisor/runsc/boot.(*Loader).WaitExit(0xc000390000, 0x0, 0x0)
	runsc/boot/loader.go:894 +0x73
gvisor.dev/gvisor/runsc/cmd.(*Boot).Execute(0xc0001c82d0, 0x13f9f60, 0xc00013a000, 0xc00029c5a0, 0xc00024ade0, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:254 +0x149e
github.com/google/subcommands.(*Commander).Execute(0xc000152000, 0x13f9f60, 0xc00013a000, 0xc00024ade0, 0x2, 0x2, 0x0)
	external/com_github_google_subcommands/subcommands.go:200 +0x51d
github.com/google/subcommands.Execute(...)
	external/com_github_google_subcommands/subcommands.go:481
main.main()
	runsc/main.go:318 +0x2ce3