panic: Decrementing non-positive ref count 0xc0006ac000, owned by vfs.Filesystem

goroutine 165 [running]:
panic({0x298360?, 0xc000354b90?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc0005ccc90 sp=0xc0005ccbe0 pc=0x12bcd6c
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc0006ac000, 0xc0005ccd08)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/vfs/filesystem_refs.go:126 +0x12c fp=0xc0005cccf8 sp=0xc0005ccc90 pc=0x18422cc
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc0006ac000, {0x7efef8, 0xc0004bb500})
	pkg/sentry/vfs/filesystem.go:77 +0x69 fp=0xc0005ccd38 sp=0xc0005cccf8 pc=0x18418e9
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc00045c8d8, {0x7efef8, 0xc0004bb500})
	pkg/sentry/vfs/vfs.go:1030 +0x1e9 fp=0xc0005cce10 sp=0xc0005ccd38 pc=0x186bb29
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy.func1()
	pkg/sentry/vfs/mount.go:826 +0x50 fp=0xc0005cce50 sp=0xc0005cce10 pc=0x184e870
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc0005cce88 sp=0xc0005cce50 pc=0x12bbeb1
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc00025bd90, {0x7efef8, 0xc0004bb500})
	pkg/sentry/vfs/mount.go:839 +0x4ad fp=0xc0005ccfc0 sp=0xc0005cce88 pc=0x184e78d
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc00025bd90, {0x7efef8, 0xc0004bb500})
	pkg/sentry/vfs/mount.go:820 +0x79 fp=0xc0005ccfe8 sp=0xc0005ccfc0 pc=0x184e299
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).unlockMounts(0xc00045c8d8, {0x7efef8, 0xc0004bb500})
	pkg/sentry/vfs/vfs.go:1030 +0x1e9 fp=0xc0005cd0c0 sp=0xc0005ccfe8 pc=0x186bb29
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt.func2()
	pkg/sentry/vfs/mount.go:578 +0x50 fp=0xc0005cd100 sp=0xc0005cd0c0 pc=0x184cf10
runtime.deferreturn()
	GOROOT/src/runtime/panic.go:477 +0x31 fp=0xc0005cd138 sp=0xc0005cd100 pc=0x12bbeb1
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc00045c8d8, {0x7efef8, 0xc0004bb500}, 0xc000899320, 0xc0004c7200?, 0xc0005cd360)
	pkg/sentry/vfs/mount.go:602 +0x4aa fp=0xc0005cd2d8 sp=0xc0005cd138 pc=0x184cb2a
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc0004bb500, 0xc0005cd598?, {{0x7f89f191fa90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x3d1 fp=0xc0005cd4d8 sp=0xc0005cd2d8 pc=0x1e17cb1
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0004bb500, 0xa6, {{0x7f89f191fa90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x8b5 fp=0xc0005cd8f8 sp=0xc0005cd4d8 pc=0x1c09b15
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0004bb500, 0x253b240?, {{0x7f89f191fa90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x6c fp=0xc0005cd998 sp=0xc0005cd8f8 pc=0x1c0b94c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0005cdb58?, 0x2125e59?, {{0x7f89f191fa90}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x87 fp=0xc0005cda10 sp=0xc0005cd998 pc=0x1c0b307
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0004bb500)
	pkg/sentry/kernel/task_syscall.go:257 +0x4f0 fp=0xc0005cdb68 sp=0xc0005cda10 pc=0x1c0ae90
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0004bb500?, 0xc0004bb500)
	pkg/sentry/kernel/task_run.go:269 +0x1e08 fp=0xc0005cde70 sp=0xc0005cdb68 pc=0x1bf5708
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0004bb500, 0x9)
	pkg/sentry/kernel/task_run.go:98 +0x43b fp=0xc0005cdfb0 sp=0xc0005cde70 pc=0x1bf301b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x45 fp=0xc0005cdfe0 sp=0xc0005cdfb0 pc=0x1c078a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc0005cdfe8 sp=0xc0005cdfe0 pc=0x12f5d81
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 139
	pkg/sentry/kernel/task_start.go:391 +0x1ae