From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: Re: unregister_netdevice: waiting for DEV to become free Date: Fri, 20 Apr 2018 16:59:02 -0700 Message-ID: <000000000000ed9844056a507832@google.com> References: <000000000000d71bf6056a34b628@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes To: ddstreet@ieee.org, dvyukov@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Return-path: In-Reply-To: <000000000000d71bf6056a34b628@google.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org syzbot has found reproducer for the following crash on https://github.com/google/kmsan.git/master commit 48c6a2b0ab1b752451cdc40b5392471ed1a2a329 (Mon Apr 16 08:42:26 2018 +0000) mm/kmsan: fix origin calculation in kmsan_internal_check_memory syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=2dfb68e639f0621b19fb So far this crash happened 180 times on https://github.com/google/kmsan.git/master, net-next, upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4936564132020224 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5817131010621440 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6313498770407424 Kernel config: https://syzkaller.appspot.com/x/.config?id=6627248707860932248 compiler: clang version 7.0.0 (trunk 329391) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2dfb68e639f0621b19fb@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state unregister_netdevice: waiting for lo to become free. Usage count = 3