panic: Decrementing non-positive ref count 0xc00022eea0, owned by vfs.Filesystem

goroutine 238 [running]:
panic({0x298360?, 0xc00034c9a0?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc000022c90 sp=0xc000022be0 pc=0x12bcd6c
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc00022eea0, 0xc000022d08)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/vfs/filesystem_refs.go:126 +0x12c fp=0xc000022cf8 sp=0xc000022c90 pc=0x18422cc
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc00022eea0, {0x7efef8, 0xc0009baa80})
	pkg/sentry/vfs/filesystem.go:77 +0x69 fp=0xc000022d38 sp=0xc000022cf8 pc=0x18418e9
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc0004561d8, {0x7efef8, 0xc0009baa80})
	pkg/sentry/vfs/vfs.go:1030 +0x1e9 fp=0xc000022e10 sp=0xc000022d38 pc=0x186bb29
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy.func1()
	pkg/sentry/vfs/mount.go:826 +0x50 fp=0xc000022e50 sp=0xc000022e10 pc=0x184e870
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc000022e88 sp=0xc000022e50 pc=0x12bbeb1
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc0002549a0, {0x7efef8, 0xc0009baa80})
	pkg/sentry/vfs/mount.go:839 +0x4ad fp=0xc000022fc0 sp=0xc000022e88 pc=0x184e78d
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc0002549a0, {0x7efef8, 0xc0009baa80})
	pkg/sentry/vfs/mount.go:820 +0x79 fp=0xc000022fe8 sp=0xc000022fc0 pc=0x184e299
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc0004561d8, {0x7efef8, 0xc0009baa80})
	pkg/sentry/vfs/vfs.go:1030 +0x1e9 fp=0xc0000230c0 sp=0xc000022fe8 pc=0x186bb29
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt.func2()
	pkg/sentry/vfs/mount.go:578 +0x50 fp=0xc000023100 sp=0xc0000230c0 pc=0x184cf10
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc000023138 sp=0xc000023100 pc=0x12bbeb1
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc0004561d8, {0x7efef8, 0xc0009baa80}, 0xc0009898c0, 0xc000517600?, 0xc000023360)
	pkg/sentry/vfs/mount.go:602 +0x4aa fp=0xc0000232d8 sp=0xc000023138 pc=0x184cb2a
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc0009baa80, 0xc000023598?, {{0x7f0de9edca90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x3d1 fp=0xc0000234d8 sp=0xc0000232d8 pc=0x1e17cb1
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0009baa80, 0xa6, {{0x7f0de9edca90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x8b5 fp=0xc0000238f8 sp=0xc0000234d8 pc=0x1c09b15
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0009baa80, 0x253b240?, {{0x7f0de9edca90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x6c fp=0xc000023998 sp=0xc0000238f8 pc=0x1c0b94c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000023b58?, 0x2125e59?, {{0x7f0de9edca90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x87 fp=0xc000023a10 sp=0xc000023998 pc=0x1c0b307
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0009baa80)
	pkg/sentry/kernel/task_syscall.go:257 +0x4f0 fp=0xc000023b68 sp=0xc000023a10 pc=0x1c0ae90
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0009baa80?, 0xc0009baa80)
	pkg/sentry/kernel/task_run.go:269 +0x1e08 fp=0xc000023e70 sp=0xc000023b68 pc=0x1bf5708
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0009baa80, 0x7)
	pkg/sentry/kernel/task_run.go:98 +0x43b fp=0xc000023fb0 sp=0xc000023e70 pc=0x1bf301b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x45 fp=0xc000023fe0 sp=0xc000023fb0 pc=0x1c078a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc000023fe8 sp=0xc000023fe0 pc=0x12f5d81
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 274
	pkg/sentry/kernel/task_start.go:391 +0x1ae