Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind

From: Andrew Morton
Date: Tue Jan 26 2016 - 15:49:24 EST


On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> wrote:

> Let's mark the VMA as VM_IO to indicate to mm core that the VMA is
> migratable.
>
> ...
>
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -1261,7 +1261,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
> }
>
> sfp->mmap_called = 1;
> - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
> + vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
> vma->vm_private_data = sfp;
> vma->vm_ops = &sg_mmap_vm_ops;
> return 0;

I'll put cc:stable on this - I don't think we recently did anything to make
this happen?