panic: kernfs.Dentry.DecRef() called without holding a reference

goroutine 1219633 [running]:
panic(0x11d1600, 0x15654e8)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc00311d7d8 sp=0xc00311d710 pc=0x437c65
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc01564cc60, 0x15aa460, 0xc00fddaa80)
	pkg/sentry/fsimpl/kernfs/kernfs.go:312 +0x11f fp=0xc00311d800 sp=0xc00311d7d8 pc=0x8a979f
gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc01564cc60, 0x15aa460, 0xc00fddaa80)
	pkg/sentry/vfs/dentry.go:163 +0x52 fp=0xc00311d828 sp=0xc00311d800 pc=0x771ed2
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc00022f078, 0x15aa460, 0xc00fddaa80, 0xc000f04360, 0xc00285f700, 0x7, 0xc00285f600, 0x6, 0xc00311dab0, 0xc002e824e0, ...)
	pkg/sentry/vfs/mount.go:226 +0x2cc fp=0xc00311d8f8 sp=0xc00311d828 pc=0x783aec
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc00022f078, 0x15aa460, 0xc00fddaa80, 0xc000f04360, 0xc00285f700, 0x7, 0xc00311dae0, 0xc00285f600, 0x6, 0xc00311dab0, ...)
	pkg/sentry/vfs/mount.go:307 +0xde fp=0xc00311d998 sp=0xc00311d8f8 pc=0x78415e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc00fddaa80, 0x20000280, 0x20000280, 0x20000180, 0x2008010, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x618 fp=0xc00311dba8 sp=0xc00311d998 pc=0xf2d818
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00fddaa80, 0xa5, 0x20000280, 0x20000280, 0x20000180, 0x2008010, 0x0, 0x0, 0xc000001fa0, 0x13ddd80, ...)
	pkg/sentry/kernel/task_syscall.go:115 +0x1b9 fp=0xc00311dc68 sp=0xc00311dba8 pc=0xa66619
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00fddaa80, 0xa5, 0x20000280, 0x20000280, 0x20000180, 0x2008010, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:290 +0x70 fp=0xc00311dcf0 sp=0xc00311dc68 pc=0xa678f0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00fddaa80, 0xa5, 0x20000280, 0x20000280, 0x20000180, 0x2008010, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:237 +0xb4 fp=0xc00311dd50 sp=0xc00311dcf0 pc=0xa673d4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00fddaa80, 0x2, 0xc00fddaa80)
	pkg/sentry/kernel/task_syscall.go:204 +0x198 fp=0xc00311de20 sp=0xc00311dd50 pc=0xa66cb8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00fddaa80, 0x157e4a0, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xe15 fp=0xc00311df60 sp=0xc00311de20 pc=0xa59b75
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00fddaa80, 0x50d9)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc00311dfd0 sp=0xc00311df60 pc=0xa58602
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc00311dfd8 sp=0xc00311dfd0 pc=0x472861
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:380 +0x116