WARNING: DATA RACE
DIAGNOSIS:
I0406 04:03:08.681398   25727 x:0] ***************************
I0406 04:03:08.681554   25727 x:0] 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 -platform=ptrace -file-access=shared -network=sandbox debug -stacks ci-gvisor-ptrace-proxy-sandbox-race-2]
I0406 04:03:08.681672   25727 x:0] Version release-20190304.1-92-gee7e6d33b2a0
I0406 04:03:08.681716   25727 x:0] PID: 25727
I0406 04:03:08.681757   25727 x:0] UID: 0, GID: 0
I0406 04:03:08.681788   25727 x:0] Configuration:
I0406 04:03:08.681805   25727 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0406 04:03:08.681823   25727 x:0] 		Platform: ptrace
I0406 04:03:08.681864   25727 x:0] 		FileAccess: shared, overlay: false
I0406 04:03:08.681933   25727 x:0] 		Network: sandbox, logging: false
I0406 04:03:08.681982   25727 x:0] 		Strace: false, max size: 1024, syscalls: []
I0406 04:03:08.682013   25727 x:0] ***************************
D0406 04:03:08.682298   25727 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0406 04:03:08.690702   25727 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0406 04:03:08.690814   25727 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0406 04:03:08.690872   25727 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0406 04:03:08.691754   25727 x:0] urpc: successfully marshalled 117 bytes.
D0406 04:03:08.705536   25727 x:0] urpc: unmarshal success.
I0406 04:03:08.705661   25727 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 13540
I0406 04:03:08.705736   25727 x:0] Retrieving sandbox stacks
D0406 04:03:08.705991   25727 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0406 04:03:08.706047   25727 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0406 04:03:08.706674   25727 x:0] urpc: successfully marshalled 36 bytes.
D0406 04:03:09.467995   25727 x:0] urpc: unmarshal success.
I0406 04:03:09.468190   25727 x:0]      *** Stack dump ***
goroutine 3064759 [running]:
gvisor.googlesource.com/gvisor/pkg/log.Stacks(0x45c801, 0xc000302360, 0xc001ee1da0, 0xc001c84700)
	pkg/log/log.go:259 +0xb6
gvisor.googlesource.com/gvisor/runsc/boot.(*debug).Stacks(0x23e9c30, 0x23e9c30, 0xc000256c50, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc000302360, 0xc000010b18, 0x13, 0x1136349, 0x4, 0xc0061abeb8, 0x3, 0x3, 0x4a864e, 0xfe6600, ...)
	GOROOT/src/reflect/value.go:447 +0x649
reflect.Value.Call(0xc000302360, 0xc000010b18, 0x13, 0xc0061abeb8, 0x3, 0x3, 0x0, 0x23e9c30, 0x16)
	GOROOT/src/reflect/value.go:308 +0xc1
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleOne(0xc000251bc0, 0xc003128630, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x63f
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleRegistered(0xc000251bc0, 0xc003128630, 0xc000251bc0, 0xc003128630)
	pkg/urpc/urpc.go:420 +0x43
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc000251bc0, 0xc003128630)
	pkg/urpc/urpc.go:440 +0x77
created by gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).StartHandling
	pkg/urpc/urpc.go:438 +0x6f

goroutine 1 [semacquire, 29 minutes]:
sync.runtime_Semacquire(0xc0002a40d4)
	GOROOT/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc0002a40d4)
	GOROOT/src/sync/waitgroup.go:130 +0xb2
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Kernel).WaitExited(...)
	pkg/sentry/kernel/kernel.go:820
gvisor.googlesource.com/gvisor/runsc/boot.(*Loader).WaitExit(0xc00022c8c0, 0x0, 0x0)
	runsc/boot/loader.go:781 +0x74
gvisor.googlesource.com/gvisor/runsc/cmd.(*Boot).Execute(0xc00022a1b0, 0x12c89c0, 0xc0000ce008, 0xc000106b40, 0xc00019f120, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:252 +0x12e4
github.com/google/subcommands.(*Commander).Execute(0xc000124000, 0x12c89c0, 0xc0000ce008, 0xc00019f120, 0x2, 0x2, 0x203000)
	external/com_github_google_subcommands/subcommands.go:141 +0x522
github.com/google/subcommands.Execute(...)
	external/com_github_google_subcommands/subcommands.go:371
main.main()
	runsc/main.go:238 +0x2473