On 26.1.2016 21:28, Kirill A. Shutemov wrote:
> From 396ad132be07a2d2b9ec5d1d6ec9fe2fffe8105e Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov"
> Date: Tue, 26 Jan 2016 22:59:16 +0300
> Subject: [PATCH] sg: mark VMA as VM_IO to prevent migration
>
> Reduced testcase:
>
> #include
>
On Tue, Jan 26, 2016 at 12:48:23PM -0800, Andrew Morton wrote:
> On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov"
> wrote:
>
> > The patch below fixes the issue for me, but this bug makes me wounder how
> > many bugs like this we have in kernel... :-/
> >
> > Looks like we are too permis
On Tue, Jan 26, 2016 at 12:49:16PM -0800, Andrew Morton wrote:
> On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov"
> 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
> >
On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov"
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)
>
On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov"
wrote:
> The patch below fixes the issue for me, but this bug makes me wounder how
> many bugs like this we have in kernel... :-/
>
> Looks like we are too permissive about which VMA is migratable:
> vma_migratable() filters out VMA by VM_
On Tue, Jan 26, 2016 at 01:52:31PM +0100, Dmitry Vyukov wrote:
> Hello,
>
> The following program triggers the following bug:
>
> page:eab82240 count:0 mapcount:1 mapping:dead
> index:0x0 compound_mapcount: 0
> flags: 0x1fffc00()
> page dumped because: VM_BUG_ON_PAGE(P
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