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

goroutine 286 [running]:
panic({0x1167ac0, 0xc000c160c0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000b83470 sp=0xc000b833b0 pc=0x436abb
runtime.panicdottypeE(...)
	GOROOT/src/runtime/iface.go:262
runtime.panicdottypeI(0xc000b834b0?, 0x12b6640, 0x11b1600)
	GOROOT/src/runtime/iface.go:272 +0x7c fp=0xc000b83498 sp=0xc000b83470 pc=0x40b45c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).MkdirAt(0xc000240e60, {0x15350c0, 0xc000871500}, 0xc0002bd200, {0xc780?, 0xbe?})
	pkg/sentry/fsimpl/kernfs/filesystem.go:412 +0x805 fp=0xc000b836c8 sp=0xc000b83498 pc=0x806b25
gvisor.dev/gvisor/pkg/sentry/fsimpl/sys.(*filesystem).MkdirAt(0xc000251360?, {0x15350c0?, 0xc000871500?}, 0xc0002bd200?, {0x0?, 0x0?})
	<autogenerated>:1 +0x2e fp=0xc000b83700 sp=0xc000b836c8 pc=0xf1158e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MkdirAt(0xc000bec780?, {0x15350c0, 0xc000871500}, 0xc000781c00?, 0xc000bc0000?, 0xc000b837f4)
	pkg/sentry/vfs/vfs.go:367 +0x191 fp=0xc000b83760 sp=0xc000b83700 pc=0x796e91
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.mkdirat(0xc000871500, 0x4?, 0xc000870100?, 0x1ff)
	pkg/sentry/syscalls/linux/sys_file.go:947 +0x28b fp=0xc000b838e8 sp=0xc000b83760 pc=0xb3f06b
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Mkdirat(0xc000871500?, 0x0?, {{0xffffff9c}, {0x7f5d0ab835c0}, {0x1ff}, {0x0}, {0x3}, {0x7f5d0ab832d7}})
	pkg/sentry/syscalls/linux/sys_file.go:934 +0x50 fp=0xc000b83918 sp=0xc000b838e8 pc=0xb3edb0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000871500, 0x102, {{0xffffff9c}, {0x7f5d0ab835c0}, {0x1ff}, {0x0}, {0x3}, {0x7f5d0ab832d7}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc000b83c58 sp=0xc000b83918 pc=0x9d72cb
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000871500, 0x85?, {{0xffffff9c}, {0x7f5d0ab835c0}, {0x1ff}, {0x0}, {0x3}, {0x7f5d0ab832d7}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc000b83cb8 sp=0xc000b83c58 pc=0x9d88b4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x852a6f?, 0x0?, {{0xffffff9c}, {0x7f5d0ab835c0}, {0x1ff}, {0x0}, {0x3}, {0x7f5d0ab832d7}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc000b83d18 sp=0xc000b83cb8 pc=0x9d84a5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0004b9a00?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc000b83e10 sp=0xc000b83d18 pc=0x9d816c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000176e80?, 0xc000871500)
	pkg/sentry/kernel/task_run.go:269 +0x144a fp=0xc000b83f48 sp=0xc000b83e10 pc=0x9c9c2a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000871500, 0x17)
	pkg/sentry/kernel/task_run.go:98 +0x25c fp=0xc000b83fc0 sp=0xc000b83f48 pc=0x9c80dc
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:390 +0x2a fp=0xc000b83fe0 sp=0xc000b83fc0 pc=0x9d574a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000b83fe8 sp=0xc000b83fe0 pc=0x46d4c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:390 +0x105