WARNING: DATA RACE
Write at 0x00c08837dd48 by goroutine 712:
  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:421 +0x47
  gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked()
      pkg/sentry/mm/vma.go:371 +0x51a
  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:226 +0x27e
DIAGNOSIS:
I0312 00:54:31.723714   12990 x:0] ***************************
I0312 00:54:31.723916   12990 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-1]
I0312 00:54:31.724040   12990 x:0] Git Revision: bc9b979b9412ad5852872c1a9bee462f73d2455e
I0312 00:54:31.724116   12990 x:0] PID: 12990
I0312 00:54:31.724150   12990 x:0] UID: 0, GID: 0
I0312 00:54:31.724168   12990 x:0] Configuration:
I0312 00:54:31.724182   12990 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0312 00:54:31.724221   12990 x:0] 		Platform: ptrace
I0312 00:54:31.724271   12990 x:0] 		FileAccess: exclusive, overlay: true
I0312 00:54:31.724302   12990 x:0] 		Network: host, logging: false
I0312 00:54:31.724411   12990 x:0] 		Strace: false, max size: 1024, syscalls: []
I0312 00:54:31.724522   12990 x:0] ***************************
D0312 00:54:31.724631   12990 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-1"
D0312 00:54:31.735447   12990 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-1": signal 0
D0312 00:54:31.735632   12990 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0312 00:54:31.735847   12990 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0312 00:54:31.738637   12990 x:0] urpc: successfully marshalled 120 bytes.
D0312 00:54:31.738878   12990 x:0] urpc: unmarshal success.
I0312 00:54:31.740145   12990 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-1", PID: 64453
I0312 00:54:31.740554   12990 x:0] Retrieving sandbox stacks
D0312 00:54:31.740653   12990 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0312 00:54:31.740704   12990 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0312 00:54:31.741180   12990 x:0] urpc: successfully marshalled 36 bytes.
D0312 00:54:32.207348   12990 x:0] urpc: unmarshal success.
I0312 00:54:32.208252   12990 x:0]      *** Stack dump ***
goroutine 3497991 [running]:
gvisor.googlesource.com/gvisor/pkg/log.Stacks(0x45c001, 0xc000312840, 0xc08a3c2ae0, 0xc0011a5c00)
	pkg/log/log.go:259 +0xb6
gvisor.googlesource.com/gvisor/runsc/boot.(*debug).Stacks(0x23a8a78, 0x23a8a78, 0xc086c5adf0, 0x0, 0x0)
	runsc/boot/debug.go:26 +0x38
reflect.Value.call(0xc000312840, 0xc000010aa8, 0x13, 0x110be05, 0x4, 0xc0025b7eb8, 0x3, 0x3, 0x4a765e, 0xfbfba0, ...)
	GOROOT/src/reflect/value.go:447 +0x63f
reflect.Value.Call(0xc000312840, 0xc000010aa8, 0x13, 0xc0025b7eb8, 0x3, 0x3, 0x0, 0x23a8a78, 0x16)
	GOROOT/src/reflect/value.go:308 +0xc1
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleOne(0xc00024d380, 0xc08a0db5c0, 0x0, 0x0)
	pkg/urpc/urpc.go:325 +0x63f
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).handleRegistered(0xc00024d380, 0xc08a0db5c0, 0xc00024d380, 0xc08a0db5c0)
	pkg/urpc/urpc.go:420 +0x43
gvisor.googlesource.com/gvisor/pkg/urpc.(*Server).StartHandling.func1(0xc00024d380, 0xc08a0db5c0)
	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, 36 minutes]:
sync.runtime_Semacquire(0xc0002a2264)
	GOROOT/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc0002a2264)
	GOROOT/src/sync/waitgroup.go:130 +0xb2
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Kernel).WaitExited(...)
	pkg/sentry/kernel/kernel.go:813
gvisor.googlesource.com/gvisor/runsc/boot.(*Loader).WaitExit(0xc0002a8140, 0x0, 0x0)
	runsc/boot/loader.go:757 +0x74
gvisor.googlesource.com/gvisor/runsc/cmd.(*Boot).Execute(0xc000230120, 0x1294a60, 0xc0000d0008, 0xc000108c00, 0xc0001a10e0, 0x2, 0x2, 0x0)
	runsc/cmd/boot.go:236 +0x1191
github.com/google/subcommands.(*Commander).Execute(0xc000126000, 0x1294a60, 0xc0000d0008, 0xc0001a10e0, 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:229 +0x246f