WARNING: DATA RACE
Write at 0x00c000269718 by goroutine 568:
  sync/atomic.CompareAndSwapInt32()
      bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/linux_amd64_static_race_stripped/stdlib%/src/runtime/race_amd64.s:293 +0xb
  sync.(*Mutex).Lock()
      GOROOT/src/sync/mutex.go:74 +0x4d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel/shm.(*Shm).RemoveMapping()
      pkg/sentry/kernel/shm/shm.go:422 +0x47
  gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked()
      pkg/sentry/mm/vma.go:371 +0x565
  gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked()
      pkg/sentry/mm/vma.go:346 +0x8b
  gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers()
      pkg/sentry/mm/lifecycle.go:231 +0x27e
DIAGNOSIS:
I0402 09:48:28.566169   34698 x:0] ***************************
I0402 09:48:28.569931   34698 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 -platform=ptrace -file-access=exclusive -overlay -network=host debug -stacks ci-gvisor-kvm-direct-overlay-host-race-3]
I0402 09:48:28.570036   34698 x:0] Version release-20190304.1-70-g1df3fa699774
I0402 09:48:28.570084   34698 x:0] PID: 34698
I0402 09:48:28.570145   34698 x:0] UID: 0, GID: 0
I0402 09:48:28.570194   34698 x:0] Configuration:
I0402 09:48:28.570223   34698 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0402 09:48:28.570249   34698 x:0] 		Platform: ptrace
I0402 09:48:28.570272   34698 x:0] 		FileAccess: exclusive, overlay: true
I0402 09:48:28.570312   34698 x:0] 		Network: host, logging: false
I0402 09:48:28.570363   34698 x:0] 		Strace: false, max size: 1024, syscalls: []
I0402 09:48:28.570402   34698 x:0] ***************************
D0402 09:48:28.570508   34698 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-3"
D0402 09:48:28.580101   34698 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-3": signal 0
D0402 09:48:28.580188   34698 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0402 09:48:28.580231   34698 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0402 09:48:28.580882   34698 x:0] urpc: successfully marshalled 120 bytes.
D0402 09:48:28.583187   34698 x:0] urpc: unmarshal success.
I0402 09:48:28.583437   34698 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-3", PID: 47212
I0402 09:48:28.583531   34698 x:0] Retrieving sandbox stacks
D0402 09:48:28.583575   34698 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0402 09:48:28.584219   34698 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0402 09:48:28.590379   34698 x:0] urpc: successfully marshalled 36 bytes.
D0402 09:48:28.925539   34698 x:0] urpc: unmarshal success.
I0402 09:48:28.927891   34698 x:0]      *** Stack dump ***
goroutine 1578066 [running]:
gvisor.googlesource.com/gvisor/pkg/log.Stacks(0x45c801, 0xc0002a2ba0, 0xc001217440, 0xc000a6e000)
	pkg/log/log.go:259 +0xb6
gvisor.googlesource.com/gvisor/runsc/boot.(*debug).Stacks(0x23dbc70, 0x23dbc70, 0xc0007240e0, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc0002a2ba0, 0xc0002a01d0, 0x13, 0x112e16b, 0x4, 0xc0014a9eb8, 0x3, 0x3, 0x4a864e, 0xfdf3c0, ...)
	GOROOT/src/reflect/value.go:447 +0x649
reflect.Value.Call(0xc0002a2ba0, 0xc0002a01d0, 0x13, 0xc0014a9eb8, 0x3, 0x3, 0x0, 0x23dbc70, 0x16)
	GOROOT/src/reflect/value.go:308 +0xc1
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleOne(0xc0002ae5a0, 0xc00158ed80, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x63f
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleRegistered(0xc0002ae5a0, 0xc00158ed80, 0xc0002ae5a0, 0xc00158ed80)
	pkg/urpc/urpc.go:420 +0x43
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc0002ae5a0, 0xc00158ed80)
	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, 17 minutes]:
sync.runtime_Semacquire(0xc0002a4264)
	GOROOT/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc0002a4264)
	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(0xc00029c140, 0x0, 0x0)
	runsc/boot/loader.go:781 +0x74
gvisor.googlesource.com/gvisor/runsc/cmd.(*Boot).Execute(0xc000234120, 0x12bfc20, 0xc0000ce008, 0xc000114b40, 0xc0001a50e0, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:252 +0x12e4
github.com/google/subcommands.(*Commander).Execute(0xc00012a000, 0x12bfc20, 0xc0000ce008, 0xc0001a50e0, 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