panic: Decrementing non-positive ref count 0xc0009ab860, owned by vfs.Filesystem

goroutine 246 [running]:
panic({0x298660?, 0xc000af8a40?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc0008b4c58 sp=0xc0008b4ba8 pc=0x12238ac
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc0009ab860, 0xc0008b4cc8)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/vfs/filesystem_refs.go:126 +0x13f fp=0xc0008b4cb8 sp=0xc0008b4c58 pc=0x17f1c1f
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc0009ab860, {0x7295b8, 0xc000834a80})
	pkg/sentry/vfs/filesystem.go:77 +0x7a fp=0xc0008b4cf8 sp=0xc0008b4cb8 pc=0x17f0f7a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc0002ed358, {0x7295b8, 0xc000834a80})
	pkg/sentry/vfs/vfs.go:1030 +0x24d fp=0xc0008b4dd0 sp=0xc0008b4cf8 pc=0x18209ed
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy.func1()
	pkg/sentry/vfs/mount.go:826 +0x50 fp=0xc0008b4e10 sp=0xc0008b4dd0 pc=0x18000d0
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc0008b4e48 sp=0xc0008b4e10 pc=0x12229f1
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc0005acfd0, {0x7295b8, 0xc000834a80})
	pkg/sentry/vfs/mount.go:839 +0x58d fp=0xc0008b4f88 sp=0xc0008b4e48 pc=0x17fffed
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc0005acfd0, {0x7295b8, 0xc000834a80})
	pkg/sentry/vfs/mount.go:820 +0xca fp=0xc0008b4fb8 sp=0xc0008b4f88 pc=0x17ffa2a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc0002ed358, {0x7295b8, 0xc000834a80})
	pkg/sentry/vfs/vfs.go:1030 +0x24d fp=0xc0008b5090 sp=0xc0008b4fb8 pc=0x18209ed
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt.func2()
	pkg/sentry/vfs/mount.go:578 +0x50 fp=0xc0008b50d0 sp=0xc0008b5090 pc=0x17fe2d0
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc0008b5108 sp=0xc0008b50d0 pc=0x12229f1
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc0002ed358, {0x7295b8, 0xc000834a80}, 0xc00087cae0, 0xc000ba6100?, 0xc0008b5334)
	pkg/sentry/vfs/mount.go:602 +0x513 fp=0xc0008b52a8 sp=0xc0008b5108 pc=0x17fdf93
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc000834a80, 0x1256eee?, {{0x7fc54fe93a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x3a5 fp=0xc0008b54d0 sp=0xc0008b52a8 pc=0x1e41025
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000834a80, 0xa6, {{0x7fc54fe93a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xaff fp=0xc0008b5908 sp=0xc0008b54d0 pc=0x1c0593f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000834a80, 0x1?, {{0x7fc54fe93a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0008b59c0 sp=0xc0008b5908 pc=0x1c079fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00082e0f0?, 0x125faa9?, {{0x7fc54fe93a90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xbd fp=0xc0008b5a38 sp=0xc0008b59c0 pc=0x1c072fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000834a80)
	pkg/sentry/kernel/task_syscall.go:257 +0x55b fp=0xc0008b5b70 sp=0xc0008b5a38 pc=0x1c06e5b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000834a80?, 0xc000834a80)
	pkg/sentry/kernel/task_run.go:269 +0x2387 fp=0xc0008b5e60 sp=0xc0008b5b70 pc=0x1befd47
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000834a80, 0x7)
	pkg/sentry/kernel/task_run.go:98 +0x36a fp=0xc0008b5fb0 sp=0xc0008b5e60 pc=0x1bed0aa
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x45 fp=0xc0008b5fe0 sp=0xc0008b5fb0 pc=0x1c031a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc0008b5fe8 sp=0xc0008b5fe0 pc=0x125c8c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 277
	pkg/sentry/kernel/task_start.go:391 +0x1ce