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

goroutine 128 [running]:
panic({0x315f60, 0xc0008f3500})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0005c6f10 sp=0xc0005c6e50 pc=0x11de9db
runtime.panicdottypeE(...)
	GOROOT/src/runtime/iface.go:262
runtime.panicdottypeI(0xc000487590?, 0x46b9c0, 0x360b40)
	GOROOT/src/runtime/iface.go:272 +0x7c fp=0xc0005c6f38 sp=0xc0005c6f10 pc=0x11b2d3c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).MkdirAt(0xc000487540, {0x7bade0, 0xc000801500}, 0xc000927200, {0x73a8?, 0x5c?})
	pkg/sentry/fsimpl/kernfs/filesystem.go:412 +0x885 fp=0xc0005c7190 sp=0xc0005c6f38 pc=0x17e4a25
gvisor.dev/gvisor/pkg/sentry/fsimpl/sys.(*filesystem).MkdirAt(0xc000487540, {0x7bade0, 0xc000801500}, 0xc000927200?, {0x0?, 0x0?})
	<autogenerated>:1 +0x77 fp=0xc0005c71e8 sp=0xc0005c7190 pc=0x21e7677
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MkdirAt(0xc000039f40?, {0x7bade0, 0xc000801500}, 0xc0002e8400?, 0xc0005c7388, 0xc0005c72fc)
	pkg/sentry/vfs/vfs.go:367 +0x29f fp=0xc0005c7270 sp=0xc0005c71e8 pc=0x174429f
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.mkdirat(0xc000801500, 0x121ac37?, 0x101a6f878?, 0x1ff)
	pkg/sentry/syscalls/linux/sys_file.go:947 +0x274 fp=0xc0005c7438 sp=0xc0005c7270 pc=0x1c68ab4
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Mkdirat(0xc000801500?, 0x1219079?, {{0xffffff9c}, {0x7f9815c865c0}, {0x1ff}, {0x0}, {0x3}, {0x7f9815c862d7}})
	pkg/sentry/syscalls/linux/sys_file.go:934 +0x3e fp=0xc0005c7480 sp=0xc0005c7438 pc=0x1c687de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000801500, 0x102, {{0xffffff9c}, {0x7f9815c865c0}, {0x1ff}, {0x0}, {0x3}, {0x7f9815c862d7}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9c2 fp=0xc0005c7960 sp=0xc0005c7480 pc=0x1a701a2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000801500, 0x0?, {{0xffffff9c}, {0x7f9815c865c0}, {0x1ff}, {0x0}, {0x3}, {0x7f9815c862d7}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0005c79f8 sp=0xc0005c7960 pc=0x1a71f9d
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000520000?, 0xc0008e02d0?, {{0xffffff9c}, {0x7f9815c865c0}, {0x1ff}, {0x0}, {0x3}, {0x7f9815c862d7}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc0005c7a70 sp=0xc0005c79f8 pc=0x1a7194f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000801500)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc0005c7b98 sp=0xc0005c7a70 pc=0x1a714e5
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000801500?, 0xc000801500)
	pkg/sentry/kernel/task_run.go:269 +0x1d4b fp=0xc0005c7e70 sp=0xc0005c7b98 pc=0x1a5baeb
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000801500, 0x16)
	pkg/sentry/kernel/task_run.go:98 +0x41b fp=0xc0005c7fb0 sp=0xc0005c7e70 pc=0x1a5937b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:390 +0x48 fp=0xc0005c7fe0 sp=0xc0005c7fb0 pc=0x1a6dca8
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0005c7fe8 sp=0xc0005c7fe0 pc=0x12178c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:390 +0x1ad