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

goroutine 109 [running]:
panic({0x104fae0, 0xc0006229c0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0006793d0 sp=0xc000679310 pc=0x436c9b
runtime.panicdottypeE(...)
	GOROOT/src/runtime/iface.go:262
runtime.panicdottypeI(0x7ff26ee1e5c0?, 0x119e6e0, 0x10996a0)
	GOROOT/src/runtime/iface.go:272 +0x7c fp=0xc0006793f8 sp=0xc0006793d0 pc=0x40b45c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).MkdirAt(0xc000790820, {0x13e6640, 0xc000630a80}, 0xc0007aad80, {0x7f40?, 0x3e?})
	pkg/sentry/fsimpl/kernfs/filesystem.go:412 +0x6be fp=0xc000679618 sp=0xc0006793f8 pc=0x7bb03e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*filesystem).MkdirAt(0xc0001cfde0?, {0x13e6640?, 0xc000630a80?}, 0xc0007aad80?, {0x0?, 0x0?})
	<autogenerated>:1 +0x2e fp=0xc000679650 sp=0xc000679618 pc=0xd24a0e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MkdirAt(0xc0007901e0?, {0x13e6640, 0xc000630a80}, 0xc0004bb800?, 0xc0004d2300?, 0xc000679744)
	pkg/sentry/vfs/vfs.go:367 +0x12b fp=0xc0006796b0 sp=0xc000679650 pc=0x75f66b
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.mkdirat(0xc000630a80, 0x4?, 0xc000630100?, 0x1ff)
	pkg/sentry/syscalls/linux/sys_file.go:947 +0x225 fp=0xc000679838 sp=0xc0006796b0 pc=0xa82d85
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Mkdirat(0xc000630a80?, 0x0?, {{0xffffff9c}, {0x7ebd5be825c0}, {0x1ff}, {0x0}, {0x3}, {0x7ebd5be822d7}})
	pkg/sentry/syscalls/linux/sys_file.go:934 +0x28 fp=0xc000679868 sp=0xc000679838 pc=0xa82b28
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000630a80, 0x102, {{0xffffff9c}, {0x7ebd5be825c0}, {0x1ff}, {0x0}, {0x3}, {0x7ebd5be822d7}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc000679c58 sp=0xc000679868 pc=0x94d435
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000630a80, 0xc0004fc6c0?, {{0xffffff9c}, {0x7ebd5be825c0}, {0x1ff}, {0x0}, {0x3}, {0x7ebd5be822d7}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc000679cb8 sp=0xc000679c58 pc=0x94e66a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000679e00?, 0xc83d99?, {{0xffffff9c}, {0x7ebd5be825c0}, {0x1ff}, {0x0}, {0x3}, {0x7ebd5be822d7}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc000679d18 sp=0xc000679cb8 pc=0x94e345
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0004ffe10?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc000679e10 sp=0xc000679d18 pc=0x94e0b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00061ae80?, 0xc000630a80)
	pkg/sentry/kernel/task_run.go:269 +0x101e fp=0xc000679f48 sp=0xc000679e10 pc=0x94215e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000630a80, 0x17)
	pkg/sentry/kernel/task_run.go:98 +0x1f8 fp=0xc000679fc0 sp=0xc000679f48 pc=0x940a98
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:390 +0x2a fp=0xc000679fe0 sp=0xc000679fc0 pc=0x94bc2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000679fe8 sp=0xc000679fe0 pc=0x46d6a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:390 +0xef