panic: interface conversion: vfs.DentryImpl is *tmpfs.dentry, not *kernfs.Dentry

goroutine 44 [running]:
panic({0x104fae0, 0xc000a8edb0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000a393d0 sp=0xc000a39310 pc=0x436c9b
runtime.panicdottypeE(...)
	GOROOT/src/runtime/iface.go:262
runtime.panicdottypeI(0x3fecafcec5c0?, 0x119e6e0, 0x10996a0)
	GOROOT/src/runtime/iface.go:272 +0x7c fp=0xc000a393f8 sp=0xc000a393d0 pc=0x40b45c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).MkdirAt(0xc00015a6e0, {0x13e6640, 0xc0006f5500}, 0xc000381200, {0x8f00?, 0x98?})
	pkg/sentry/fsimpl/kernfs/filesystem.go:412 +0x6be fp=0xc000a39618 sp=0xc000a393f8 pc=0x7bb03e
gvisor.dev/gvisor/pkg/sentry/fsimpl/sys.(*filesystem).MkdirAt(0xc0002e61e0?, {0x13e6640?, 0xc0006f5500?}, 0xc000381200?, {0x0?, 0x0?})
	<autogenerated>:1 +0x2e fp=0xc000a39650 sp=0xc000a39618 pc=0xdfb0ee
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MkdirAt(0xc000ace140?, {0x13e6640, 0xc0006f5500}, 0xc0007e0400?, 0xc000779f00?, 0xc000a39744)
	pkg/sentry/vfs/vfs.go:367 +0x12b fp=0xc000a396b0 sp=0xc000a39650 pc=0x75f66b
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.mkdirat(0xc0006f5500, 0x4?, 0xc0006f0100?, 0x1ff)
	pkg/sentry/syscalls/linux/sys_file.go:947 +0x225 fp=0xc000a39838 sp=0xc000a396b0 pc=0xa82d85
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Mkdirat(0xc0006f5500?, 0x0?, {{0xffffff9c}, {0x7fff709895c0}, {0x1ff}, {0x0}, {0x3}, {0x7fff709892d7}})
	pkg/sentry/syscalls/linux/sys_file.go:934 +0x28 fp=0xc000a39868 sp=0xc000a39838 pc=0xa82b28
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0006f5500, 0x102, {{0xffffff9c}, {0x7fff709895c0}, {0x1ff}, {0x0}, {0x3}, {0x7fff709892d7}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc000a39c58 sp=0xc000a39868 pc=0x94d435
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0006f5500, 0x0?, {{0xffffff9c}, {0x7fff709895c0}, {0x1ff}, {0x0}, {0x3}, {0x7fff709892d7}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc000a39cb8 sp=0xc000a39c58 pc=0x94e66a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003fab40?, 0xc000a39e00?, {{0xffffff9c}, {0x7fff709895c0}, {0x1ff}, {0x0}, {0x3}, {0x7fff709892d7}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc000a39d18 sp=0xc000a39cb8 pc=0x94e345
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0006f60b0?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc000a39e10 sp=0xc000a39d18 pc=0x94e0b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0005b0600?, 0xc0006f5500)
	pkg/sentry/kernel/task_run.go:269 +0x101e fp=0xc000a39f48 sp=0xc000a39e10 pc=0x94215e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0006f5500, 0x1a)
	pkg/sentry/kernel/task_run.go:98 +0x1f8 fp=0xc000a39fc0 sp=0xc000a39f48 pc=0x940a98
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:390 +0x2a fp=0xc000a39fe0 sp=0xc000a39fc0 pc=0x94bc2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000a39fe8 sp=0xc000a39fe0 pc=0x46d6a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:390 +0xef