linux-kernel - Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind

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Message-Id: <20160126124916.1f4ed291a6e4bcf19b74b7f7@linux-foundation.org>
Date:	Tue, 26 Jan 2016 12:49:16 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>,
	Doug Gilbert <dgilbert@...erlog.com>,
	David Rientjes <rientjes@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Shiraz Hashim <shashim@...eaurora.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	linux-scsi@...r.kernel.org
Subject: Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind

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