panic: Decrementing non-positive ref count 0xc0009792b0, owned by vfs.Filesystem

goroutine 244 [running]:
panic({0x298660?, 0xc0006ae340?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc00085ac58 sp=0xc00085aba8 pc=0x12238ac
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc0009792b0, 0xc00085acc8)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/vfs/filesystem_refs.go:126 +0x13f fp=0xc00085acb8 sp=0xc00085ac58 pc=0x17f1c1f
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc0009792b0, {0x7295b8, 0xc00080ca80})
	pkg/sentry/vfs/filesystem.go:77 +0x7a fp=0xc00085acf8 sp=0xc00085acb8 pc=0x17f0f7a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc000697358, {0x7295b8, 0xc00080ca80})
	pkg/sentry/vfs/vfs.go:1030 +0x24d fp=0xc00085add0 sp=0xc00085acf8 pc=0x18209ed
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy.func1()
	pkg/sentry/vfs/mount.go:826 +0x50 fp=0xc00085ae10 sp=0xc00085add0 pc=0x18000d0
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc00085ae48 sp=0xc00085ae10 pc=0x12229f1
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc000215e40, {0x7295b8, 0xc00080ca80})
	pkg/sentry/vfs/mount.go:839 +0x58d fp=0xc00085af88 sp=0xc00085ae48 pc=0x17fffed
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc000215e40, {0x7295b8, 0xc00080ca80})
	pkg/sentry/vfs/mount.go:820 +0xca fp=0xc00085afb8 sp=0xc00085af88 pc=0x17ffa2a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc000697358, {0x7295b8, 0xc00080ca80})
	pkg/sentry/vfs/vfs.go:1030 +0x24d fp=0xc00085b090 sp=0xc00085afb8 pc=0x18209ed
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt.func2()
	pkg/sentry/vfs/mount.go:578 +0x50 fp=0xc00085b0d0 sp=0xc00085b090 pc=0x17fe2d0
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc00085b108 sp=0xc00085b0d0 pc=0x12229f1
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc000697358, {0x7295b8, 0xc00080ca80}, 0xc00081ef00, 0xc0007fc100?, 0xc00085b334)
	pkg/sentry/vfs/mount.go:602 +0x513 fp=0xc00085b2a8 sp=0xc00085b108 pc=0x17fdf93
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc00080ca80, 0x1256eee?, {{0x7f8a8d728a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x3a5 fp=0xc00085b4d0 sp=0xc00085b2a8 pc=0x1e41025
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00080ca80, 0xa6, {{0x7f8a8d728a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xaff fp=0xc00085b908 sp=0xc00085b4d0 pc=0x1c0593f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00080ca80, 0x1?, {{0x7f8a8d728a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc00085b9c0 sp=0xc00085b908 pc=0x1c079fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00080a0f0?, 0x125faa9?, {{0x7f8a8d728a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xbd fp=0xc00085ba38 sp=0xc00085b9c0 pc=0x1c072fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00080ca80)
	pkg/sentry/kernel/task_syscall.go:257 +0x55b fp=0xc00085bb70 sp=0xc00085ba38 pc=0x1c06e5b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00080ca80?, 0xc00080ca80)
	pkg/sentry/kernel/task_run.go:269 +0x2387 fp=0xc00085be60 sp=0xc00085bb70 pc=0x1befd47
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00080ca80, 0x7)
	pkg/sentry/kernel/task_run.go:98 +0x36a fp=0xc00085bfb0 sp=0xc00085be60 pc=0x1bed0aa
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x45 fp=0xc00085bfe0 sp=0xc00085bfb0 pc=0x1c031a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc00085bfe8 sp=0xc00085bfe0 pc=0x125c8c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 260
	pkg/sentry/kernel/task_start.go:391 +0x1ce