WARNING: DATA RACE
Read at 0x00c0002d0148 by goroutine 122:
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Kernel).EmitUnimplementedEvent()
      pkg/sentry/kernel/kernel.go:1295 +0x64
  gvisor.dev/gvisor/pkg/sentry/syscalls.ErrorWithEvent.func1()
      pkg/sentry/syscalls/syscalls.go:82 +0x88
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:165 +0x407
DIAGNOSIS:
I0731 06:55:56.155238   60773 x:0] ***************************
I0731 06:55:56.155642   60773 x:0] Args: [/syzkaller/managers/kvm-direct-overlay-host-race/current/image -root /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host debug -stacks ci-gvisor-kvm-direct-overlay-host-race-1]
I0731 06:55:56.155770   60773 x:0] Version release-20190529.1-286-ge511c0e05f82
I0731 06:55:56.155831   60773 x:0] PID: 60773
I0731 06:55:56.155871   60773 x:0] UID: 0, GID: 0
I0731 06:55:56.155949   60773 x:0] Configuration:
I0731 06:55:56.155974   60773 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0731 06:55:56.156030   60773 x:0] 		Platform: ptrace
I0731 06:55:56.156082   60773 x:0] 		FileAccess: exclusive, overlay: true
I0731 06:55:56.156144   60773 x:0] 		Network: host, logging: false
I0731 06:55:56.156221   60773 x:0] 		Strace: false, max size: 1024, syscalls: []
I0731 06:55:56.156269   60773 x:0] ***************************
D0731 06:55:56.156393   60773 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-1"
D0731 06:55:56.167353   60773 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-1": signal 0
D0731 06:55:56.167491   60773 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0731 06:55:56.167576   60773 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0731 06:55:56.168277   60773 x:0] urpc: successfully marshalled 120 bytes.
D0731 06:55:56.169422   60773 x:0] urpc: unmarshal success.
I0731 06:55:56.169552   60773 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-1", PID: 59393
I0731 06:55:56.169688   60773 x:0] Retrieving sandbox stacks
D0731 06:55:56.169740   60773 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0731 06:55:56.169813   60773 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0731 06:55:56.170007   60773 x:0] urpc: successfully marshalled 36 bytes.
D0731 06:55:56.393609   60773 x:0] urpc: unmarshal success.
I0731 06:55:56.393757   60773 x:0]      *** Stack dump ***
goroutine 701 [running]:
gvisor.dev/gvisor/pkg/log.Stacks(0x45e501, 0xc000116b40, 0xc0004c26f0, 0xc0005b8a80)
	pkg/log/log.go:272 +0xb6
gvisor.dev/gvisor/runsc/boot.(*debug).Stacks(0x2514060, 0x2514060, 0xc00032a040, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc000116b40, 0xc0000101d0, 0x13, 0x11cadae, 0x4, 0xc000a8feb8, 0x3, 0x3, 0x4aa54e, 0x106e460, ...)
	GOROOT/src/reflect/value.go:447 +0x649
reflect.Value.Call(0xc000116b40, 0xc0000101d0, 0x13, 0xc000a8feb8, 0x3, 0x3, 0x0, 0x2514060, 0x16)
	GOROOT/src/reflect/value.go:308 +0xc1
gvisor.dev/gvisor/pkg/urpc.(*Server).handleOne(0xc0002c8720, 0xc0008ae600, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x63f
gvisor.dev/gvisor/pkg/urpc.(*Server).handleRegistered(0xc0002c8720, 0xc0008ae600, 0xc0002c8720, 0xc0008ae600)
	pkg/urpc/urpc.go:420 +0x43
gvisor.dev/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc0002c8720, 0xc0008ae600)
	pkg/urpc/urpc.go:440 +0x77
created by gvisor.dev/gvisor/pkg/urpc.(*Server).StartHandling
	pkg/urpc/urpc.go:438 +0x6f

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc0002d21c4)
	GOROOT/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc0002d21c4)
	GOROOT/src/sync/waitgroup.go:130 +0xb2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Kernel).WaitExited(...)
	pkg/sentry/kernel/kernel.go:953
gvisor.dev/gvisor/runsc/boot.(*Loader).WaitExit(0xc0002d0160, 0x0, 0x0)
	runsc/boot/loader.go:862 +0x74
gvisor.dev/gvisor/runsc/cmd.(*Boot).Execute(0xc0001ba240, 0x13db340, 0xc00013c010, 0xc00026e3c0, 0xc000240b60, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:254 +0x1484
github.com/google/subcommands.(*Commander).Execute(0xc000148000, 0x13db340, 0xc00013c010, 0xc000240b60, 0x2, 0x2, 0x0)
	external/com_github_google_subcommands/subcommands.go:200 +0x522
github.com/google/subcommands.Execute(...)
	external/com_github_google_subcommands/subcommands.go:481
main.main()
	runsc/main.go:262 +0x2855