panic: Decrementing non-positive ref count 0x40000fdee0, owned by vfs.Filesystem

goroutine 133 [running]:
panic({0xb34e80?, 0x4000192640?})
	GOROOT/src/runtime/panic.go:1017 +0x3cc fp=0x4000461360 sp=0x40004612b0 pc=0x49cec
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0x40000fdee0, 0x400088ea50?)
	bazel-out/aarch64-fastbuild/bin/pkg/sentry/vfs/filesystem_refs.go:126 +0x134 fp=0x40004613d0 sp=0x4000461360 pc=0x340704
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0x4000461458?, {0xfaae68?, 0x40005ec000?})
	pkg/sentry/vfs/filesystem.go:77 +0x4c fp=0x4000461410 sp=0x40004613d0 pc=0x33feac
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0x4000207a78, {0xfaae68, 0x40005ec000})
	pkg/sentry/vfs/vfs.go:1030 +0x120 fp=0x40004614c0 sp=0x4000461410 pc=0x3593b0
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy.func1()
	pkg/sentry/vfs/mount.go:826 +0x30 fp=0x40004614f0 sp=0x40004614c0 pc=0x3480c0
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0x40004204d0, {0xfaae68, 0x40005ec000})
	pkg/sentry/vfs/mount.go:839 +0x208 fp=0x40004615a0 sp=0x40004614f0 pc=0x348018
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0x40004204d0, {0xfaae68, 0x40005ec000})
	pkg/sentry/vfs/mount.go:820 +0x8c fp=0x40004615d0 sp=0x40004615a0 pc=0x347ddc
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0x4000207a78, {0xfaae68, 0x40005ec000})
	pkg/sentry/vfs/vfs.go:1030 +0x120 fp=0x4000461680 sp=0x40004615d0 pc=0x3593b0
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt.func2()
	pkg/sentry/vfs/mount.go:578 +0x30 fp=0x40004616b0 sp=0x4000461680 pc=0x347200
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0x4000207a78, {0xfaae68, 0x40005ec000}, 0x0?, 0x4000461838?, 0x40004617cc)
	pkg/sentry/vfs/mount.go:602 +0x284 fp=0x4000461780 sp=0x40004616b0 pc=0x347014
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0x40005ec000, 0x40005b04e0?, {{0xfbc1a1ea0a10}, {0xa}, {0x0}, {0xd66795e03e4d}, {0xd66795dad030}, {0x8080808080808080}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x1d4 fp=0x40004618d0 sp=0x4000461780 pc=0x68dfd4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0x40005ec000, 0x27, {{0xfbc1a1ea0a10}, {0xa}, {0x0}, {0xd66795e03e4d}, {0xd66795dad030}, {0x8080808080808080}})
	pkg/sentry/kernel/task_syscall.go:142 +0x4fc fp=0x4000461c10 sp=0x40004618d0 pc=0x5651ac
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0x40005ec000, 0x40005c2118?, {{0xfbc1a1ea0a10}, {0xa}, {0x0}, {0xd66795e03e4d}, {0xd66795dad030}, {0x8080808080808080}})
	pkg/sentry/kernel/task_syscall.go:322 +0x3c fp=0x4000461c70 sp=0x4000461c10 pc=0x56612c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x40005c6878?, 0x40005c6878?, {{0xfbc1a1ea0a10}, {0xa}, {0x0}, {0xd66795e03e4d}, {0xd66795dad030}, {0x8080808080808080}})
	pkg/sentry/kernel/task_syscall.go:282 +0x58 fp=0x4000461cd0 sp=0x4000461c70 pc=0x565da8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0x40005ae410?)
	pkg/sentry/kernel/task_syscall.go:257 +0x274 fp=0x4000461dd0 sp=0x4000461cd0 pc=0x565b64
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x40005b2600?, 0x40005ec000)
	pkg/sentry/kernel/task_run.go:269 +0xd7c fp=0x4000461f20 sp=0x4000461dd0 pc=0x55a3ec
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0x40005ec000, 0x8)
	pkg/sentry/kernel/task_run.go:98 +0x1e4 fp=0x4000461fb0 sp=0x4000461f20 pc=0x558fd4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x2c fp=0x4000461fd0 sp=0x4000461fb0 pc=0x563bcc
runtime.goexit()
	src/runtime/asm_arm64.s:1197 +0x4 fp=0x4000461fd0 sp=0x4000461fd0 pc=0x81834
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 166
	pkg/sentry/kernel/task_start.go:391 +0xe4