Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <CACT4Y+apdswWOB1XW6HsG+AUowVhozhO1ZeHDeCRBCkY8gkYfg@mail.gmail.com>
References: <001a1144d6e854b3c90562668d74@google.com> <20180124174723.25289-1-joelaf@google.com>
 <CACT4Y+apdswWOB1XW6HsG+AUowVhozhO1ZeHDeCRBCkY8gkYfg@mail.gmail.com>
From:   Joel Fernandes <joelaf@google.com>
Date:   Mon, 29 Jan 2018 19:05:00 -0800
Message-ID: <CAJWu+opxXDJ8FHHeuTZHeRRR9LJa65P2xk2F24w=9F+hEyVdXw@mail.gmail.com>
Subject: Re: possible deadlock in shmem_file_llseek
To:     Dmitry Vyukov <dvyukov@google.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        syzbot <syzbot+8ec30bb7bf1a981a2012@syzkaller.appspotmail.com>,
        Hugh Dickins <hughd@google.com>, Linux-MM <linux-mm@kvack.org>,
        syzkaller-bugs@googlegroups.com
Content-Type: multipart/mixed; boundary="94eb2c0af81ae4641f0563f5a026"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

--94eb2c0af81ae4641f0563f5a026
Content-Type: text/plain; charset="UTF-8"

On Wed, Jan 24, 2018 at 10:40 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
> On Wed, Jan 24, 2018 at 6:47 PM, Joel Fernandes <joelaf@google.com> wrote:
>>
>> #syz test: https://github.com/joelagnel/linux.git test-ashmem

Here's an updated patch. Just wanted to test it once more.

thanks,

- Joel

--94eb2c0af81ae4641f0563f5a026
Content-Type: text/x-patch; charset="US-ASCII"; 
	name="0001-ashmem-Fix-lockdep-issue-during-llseek.patch"
Content-Disposition: attachment; 
	filename="0001-ashmem-Fix-lockdep-issue-during-llseek.patch"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_jd127f2q1
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==
--94eb2c0af81ae4641f0563f5a026--