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Mon, 02 Jul 2018 11:51:53 -0700 (PDT) Subject: Re: possible deadlock in sock_hash_free To: syzbot , ast@kernel.org, daniel@iogearbox.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000222dd6056d4c4dfc@google.com> From: John Fastabend Message-ID: <469337cb-432a-a03f-eb16-9b18852edc65@gmail.com> Date: Mon, 2 Jul 2018 11:50:38 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <000000000000222dd6056d4c4dfc@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/28/2018 04:16 PM, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    7a1a98c171ea Merge branch 'bpf-sendmsg-hook' > git tree:       bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=131f4067800000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c > dashboard link: https://syzkaller.appspot.com/bug?extid=83bdee62c80cc044cb1a > compiler:       gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=17a0be2f800000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=164cf10f800000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+83bdee62c80cc044cb1a@syzkaller.appspotmail.com > > > ====================================================== > WARNING: possible circular locking dependency detected > 4.17.0-rc6+ #25 Not tainted > ------------------------------------------------------ [...] #syz fix: bpf: sockhash fix omitted bucket lock in sock_close