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[140.211.169.12]) by mx.google.com with ESMTPS id 17si3037851pgy.154.2019.03.11.16.37.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Mar 2019 16:37:50 -0700 (PDT) Received-SPF: pass (google.com: domain of akpm@linux-foundation.org designates 140.211.169.12 as permitted sender) client-ip=140.211.169.12; Authentication-Results: mx.google.com; spf=pass (google.com: domain of akpm@linux-foundation.org designates 140.211.169.12 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org Received: from localhost.localdomain (c-73-223-200-170.hsd1.ca.comcast.net [73.223.200.170]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 6555AD2E; Mon, 11 Mar 2019 23:37:49 +0000 (UTC) Date: Mon, 11 Mar 2019 16:37:47 -0700 From: Andrew Morton To: syzbot Cc: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, mhocko@suse.com, sfr@canb.auug.org.au, shakeelb@google.com, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com Subject: Re: KASAN: null-ptr-deref Read in reclaim_high Message-Id: <20190311163747.f56cceebd9c2661e4519bdfc@linux-foundation.org> In-Reply-To: <0000000000001fd5780583d1433f@google.com> References: <0000000000001fd5780583d1433f@google.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 11 Mar 2019 06:08:01 -0700 syzbot wrote: > syzbot has bisected this bug to: > > commit 29a4b8e275d1f10c51c7891362877ef6cffae9e7 > Author: Shakeel Butt > Date: Wed Jan 9 22:02:21 2019 +0000 > > memcg: schedule high reclaim for remote memcgs on high_work > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=155bf5db200000 > start commit: 29a4b8e2 memcg: schedule high reclaim for remote memcgs on.. > git tree: linux-next > final crash: https://syzkaller.appspot.com/x/report.txt?x=175bf5db200000 > console output: https://syzkaller.appspot.com/x/log.txt?x=135bf5db200000 > kernel config: https://syzkaller.appspot.com/x/.config?x=611f89e5b6868db > dashboard link: https://syzkaller.appspot.com/bug?extid=fa11f9da42b46cea3b4a > userspace arch: amd64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14259017400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=141630a0c00000 > > Reported-by: syzbot+fa11f9da42b46cea3b4a@syzkaller.appspotmail.com > Fixes: 29a4b8e2 ("memcg: schedule high reclaim for remote memcgs on > high_work") The following patch memcg-schedule-high-reclaim-for-remote-memcgs-on-high_work-v3.patch might have fixed this. Was it applied?