From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id E9DE06B0007 for ; Thu, 5 Jul 2018 03:18:41 -0400 (EDT) Received: by mail-wm0-f72.google.com with SMTP id q8-v6so3689083wmc.2 for ; Thu, 05 Jul 2018 00:18:41 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id y5-v6sor2638536wrs.28.2018.07.05.00.18.40 for (Google Transport Security); Thu, 05 Jul 2018 00:18:40 -0700 (PDT) Date: Thu, 5 Jul 2018 09:18:39 +0200 From: Oscar Salvador Subject: Re: kernel BUG at mm/gup.c:LINE! Message-ID: <20180705071839.GB30187@techadventures.net> References: <000000000000fe4b15057024bacd@google.com> <20180704111731.GJ22503@dhcp22.suse.cz> <20180704121107.GL22503@dhcp22.suse.cz> <20180704151529.GA23317@techadventures.net> <20180705064335.GA32658@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180705064335.GA32658@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Zi Yan , Tetsuo Handa , syzbot , akpm@linux-foundation.org, aneesh.kumar@linux.vnet.ibm.com, dan.j.williams@intel.com, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mst@redhat.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, ying.huang@intel.com > This is more than unexpected. The patch merely move the alignment check > up. I will try to investigate some more but I am off for next four days > and won't be online most of the time. > > Btw. does the same happen if you keep do_brk helper and add the length > sanitization there as well? I will give it a try and I will let you know. -- Oscar Salvador SUSE L3