linux-kernel - Re: general protection fault in rds_ib_get

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Message-ID: <20180705070641.ske6jjvk4zp5kg2f@linux-x5ow.site>
Date:   Thu, 5 Jul 2018 09:06:41 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
Cc:     Eric Biggers <ebiggers3@...il.com>, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com,
        syzbot <syzbot+b51c77ef956678a65834@...kaller.appspotmail.com>,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in rds_ib_get_mr

On Wed, Jul 04, 2018 at 05:32:20PM -0700, santosh.shilimkar@...cle.com wrote:
> On 7/4/18 2:35 PM, Eric Biggers wrote:
> > On Sun, May 13, 2018 at 10:46:37PM -0700, santosh.shilimkar@...cle.com 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.

Thanks,
	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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