Same problem on Fedora 23 $ uname -r 4.7.10-100.fc23.x86_64 $ sudo ./sg_mmap_read -d /dev/sg0 -l 0 | od -t x1 0000000 eb 63 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 ... $ sudo ./sg_mmap_read -d /dev/sg0 -l 0 -m | od -t x1 0000000 eb 63 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 ... $ sudo ./sg_mmap_read -d /dev/sg0 -l 0 -m -b | od -t x1 0000000 00 63 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 ... 2016-11-22 10:37 GMT+02:00 Johannes Thumshirn <jthumshirn@xxxxxxx>: > On Mon, Nov 21, 2016 at 01:24:02PM -0500, Ewan Milne wrote: >> On Mon, 2016-11-21 at 12:34 -0500, Douglas Gilbert wrote: >> > There was also this change which seems closer to the problem area: >> > >> > commit 461c7fa126794157484dca48e88effa4963e3af3 >> > Author: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> >> > Date: Tue Feb 2 16:57:35 2016 -0800 >> > >> > drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration >> > ... >> > >> > diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c >> > index 503ab8b..5e82067 100644 >> > --- 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; >> > >> > Doug Gilbert >> > >> >> Neither this change nor "sg: fix dxferp in from_to case" appears to >> fix the issue when applied on top of 4.4. Still looking... > > This brings bad memories from commit 2d99b55d3 back to live, but this is > applied on all test kernels I have. > > I too will run some bisection as well now that we have an easy reproducer and > my timezone is somewhat ahead. Let's see if we can stretch the workday a bit. > > Byte, > Johannes > > -- > Johannes Thumshirn Storage > jthumshirn@xxxxxxx +49 911 74053 689 > SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg > GF: Felix Imendörffer, Jane Smithard, Graham Norton > HRB 21284 (AG Nürnberg) > Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
