Re: general protection fault in rds_ib_get_mr

[Santosh Shilimkar]

On 7/5/2018 12:06 AM, Johannes Thumshirn wrote:
> On Wed, Jul 04, 2018 at 05:32:20PM -0700, santosh.shilimkar@xxxxxxxxxx wrote:
> > On 7/4/18 2:35 PM, Eric Biggers wrote:
> > > On Sun, May 13, 2018 at 10:46:37PM -0700, santosh.shilimkar@xxxxxxxxxx wrote:
> > > > On 5/13/18 2:10 PM, Eric Biggers wrote:
> > > > > On Wed, Mar 21, 2018 at 09:00:01AM -0700, syzbot wrote:
> > > >
> > > > [...]
> > > >
> > > >
> > > > > Still reproducible on Linus' tree (commit 66e1c94db3cd4) and linux-next
> > > > > (next-20180511).  Here's a simplified reproducer:
> > > > Thanks for the test case !!
> >
> > [...]
> >
> > > Ping; this RDS bug is still unfixed.  The same reproducer I gave earlier still
> > > works, even when run as a non-root user.  I tested upstream commit
> > > fc36def997cfd6 (v4.18-rc3-113-gfc36def997cfd), and linux-next commit
> > > bce40927669338 (next-20180704).
> > Yeah I haven't sent a fix for this yet. Downstream we have refactored
> > MR code and I wanted to get that upstream. With that this bug will
> > also get addressed. I was hoping to get that series but since some
> > optimisation is still pending investigations its getting delayed.
> >
> > Will find out if I can fix this panic in meantime with smaller change.
> > Thanks for reminder.
>
> Oh please sent bug fixes _before_ refactoring in that area. Otherwise
> it's a pain for everybody backporting the fix to a stable kernel.
OK. we will look into it if an interim fix can be made....