Re: kernel BUG at fs/userfaultfd.c:LINE! (2)

[Mike Rapoport]

On Tue, Jul 17, 2018 at 12:28:06PM -0700, Eric Biggers wrote:
> [+Cc userfaultfd developers and linux-mm]
> 
> The reproducer hits the BUG_ON() in userfaultfd_release():
> 
> 	BUG_ON(!!vma->vm_userfaultfd_ctx.ctx ^
> 	       !!(vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP)));

Thanks for the CC.

The fix is below.

--
Sincerely yours,
Mike.