From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751870AbeFEJDf (ORCPT ); Tue, 5 Jun 2018 05:03:35 -0400 Received: from mail-db5eur01on0134.outbound.protection.outlook.com ([104.47.2.134]:28864 "EHLO EUR01-DB5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751442AbeFEJDc (ORCPT ); Tue, 5 Jun 2018 05:03:32 -0400 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=ktkhai@virtuozzo.com; Subject: Re: INFO: task hung in ip6gre_exit_batch_net To: Dmitry Vyukov , syzbot Cc: Christian Brauner , David Miller , David Ahern , Florian Westphal , Jiri Benc , LKML , Xin Long , mschiffer@universe-factory.net, netdev , syzkaller-bugs , Vladislav Yasevich References: <0000000000006e4595056dd23c16@google.com> From: Kirill Tkhai Message-ID: Date: Tue, 5 Jun 2018 12:03:25 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; 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On 04.06.2018 18:22, Dmitry Vyukov wrote: > On Mon, Jun 4, 2018 at 5:03 PM, syzbot > wrote: >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: bc2dbc5420e8 Merge branch 'akpm' (patches from Andrew) >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=164e42b7800000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=982e2df1b9e60b02 >> dashboard link: https://syzkaller.appspot.com/bug?extid=bf78a74f82c1cf19069e >> 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+bf78a74f82c1cf19069e@syzkaller.appspotmail.com > > Another hang on rtnl lock: > > #syz dup: INFO: task hung in netdev_run_todo > > May be related to "unregister_netdevice: waiting for DEV to become free": > https://syzkaller.appspot.com/bug?id=1a97a5bd119fd97995f752819fd87840ab9479a9 > > Any other explanations for massive hangs on rtnl lock for minutes? To exclude the situation, when a task exists with rtnl_mutex held: would the pr_warn() from print_held_locks_bug() be included in the console output if they appear? Kirill