From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Fastabend Subject: Re: possible deadlock in bpf_tcp_close Date: Mon, 2 Jul 2018 11:52:40 -0700 Message-ID: <281d181c-ccc4-33aa-0e30-d6d555b15d13@gmail.com> References: <000000000000ca8a42056d4530a5@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit To: syzbot , ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Return-path: Received: from mail-it0-f68.google.com ([209.85.214.68]:36469 "EHLO mail-it0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753420AbeGBSxy (ORCPT ); Mon, 2 Jul 2018 14:53:54 -0400 Received: by mail-it0-f68.google.com with SMTP id h19-v6so4953405itf.1 for ; Mon, 02 Jul 2018 11:53:54 -0700 (PDT) In-Reply-To: <000000000000ca8a42056d4530a5@google.com> Content-Language: en-US Sender: netdev-owner@vger.kernel.org List-ID: On 05/28/2018 07:47 AM, 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=10fd82d7800000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c > dashboard link: https://syzkaller.appspot.com/bug?extid=47ed903f50684f046b15 > compiler:       gcc (GCC) 8.0.1 20180413 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+47ed903f50684f046b15@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