WARNING: DATA RACE
Write at 0x00c0003b3cc8 by goroutine 514:
  gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).Brk()
      pkg/sentry/mm/syscalls.go:753 +0x3e1
DIAGNOSIS:
I0501 08:56:04.559017    4600 x:0] ***************************
I0501 08:56:04.559144    4600 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-0]
I0501 08:56:04.559240    4600 x:0] Version release-20190304.1-163-g8bfb83d0acde
I0501 08:56:04.559258    4600 x:0] PID: 4600
I0501 08:56:04.559311    4600 x:0] UID: 0, GID: 0
I0501 08:56:04.559329    4600 x:0] Configuration:
I0501 08:56:04.559348    4600 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0501 08:56:04.559368    4600 x:0] 		Platform: ptrace
I0501 08:56:04.559407    4600 x:0] 		FileAccess: shared, overlay: false
I0501 08:56:04.559435    4600 x:0] 		Network: sandbox, logging: false
I0501 08:56:04.559466    4600 x:0] 		Strace: false, max size: 1024, syscalls: []
I0501 08:56:04.559492    4600 x:0] ***************************
D0501 08:56:04.559547    4600 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0501 08:56:04.566770    4600 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0501 08:56:04.566858    4600 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0501 08:56:04.566907    4600 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0501 08:56:04.567346    4600 x:0] urpc: successfully marshalled 117 bytes.
D0501 08:56:04.568522    4600 x:0] urpc: unmarshal success.
I0501 08:56:04.568615    4600 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 44005
I0501 08:56:04.568685    4600 x:0] Retrieving sandbox stacks
D0501 08:56:04.568702    4600 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0501 08:56:04.568740    4600 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0501 08:56:04.568895    4600 x:0] urpc: successfully marshalled 36 bytes.
D0501 08:56:04.754450    4600 x:0] urpc: unmarshal success.
I0501 08:56:04.754599    4600 x:0]      *** Stack dump ***
goroutine 462996 [running]:
gvisor.googlesource.com/gvisor/pkg/log.Stacks(0x45c801, 0xc0002737a0, 0xc0014207b0, 0xc000fae380)
	pkg/log/log.go:259 +0xb6
gvisor.googlesource.com/gvisor/runsc/boot.(*debug).Stacks(0x2427e60, 0x2427e60, 0xc0000f0650, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc0002737a0, 0xc00013eac0, 0x13, 0x115a58b, 0x4, 0xc000da1eb8, 0x3, 0x3, 0x4a864e, 0x10074e0, ...)
	GOROOT/src/reflect/value.go:447 +0x649
reflect.Value.Call(0xc0002737a0, 0xc00013eac0, 0x13, 0xc000da1eb8, 0x3, 0x3, 0x0, 0x2427e60, 0x16)
	GOROOT/src/reflect/value.go:308 +0xc1
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleOne(0xc000263e00, 0xc001273290, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x63f
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleRegistered(0xc000263e00, 0xc001273290, 0xc000263e00, 0xc001273290)
	pkg/urpc/urpc.go:420 +0x43
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc000263e00, 0xc001273290)
	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, 3 minutes]:
sync.runtime_Semacquire(0xc0002c2214)
	GOROOT/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc0002c2214)
	GOROOT/src/sync/waitgroup.go:130 +0xb2
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Kernel).WaitExited(...)
	pkg/sentry/kernel/kernel.go:896
gvisor.googlesource.com/gvisor/runsc/boot.(*Loader).WaitExit(0xc0002c0140, 0x0, 0x0)
	runsc/boot/loader.go:785 +0x74
gvisor.googlesource.com/gvisor/runsc/cmd.(*Boot).Execute(0xc00026c120, 0x12f0300, 0xc00013a010, 0xc0002722a0, 0xc00022a6e0, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:252 +0x12e4
github.com/google/subcommands.(*Commander).Execute(0xc000146000, 0x12f0300, 0xc00013a010, 0xc00022a6e0, 0x2, 0x2, 0xc000142880)
	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:245 +0x254e