From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6530EC2BA19 for ; Sat, 11 Apr 2020 21:38:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 374942084D for ; Sat, 11 Apr 2020 21:38:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726182AbgDKViM (ORCPT ); Sat, 11 Apr 2020 17:38:12 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:41595 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726025AbgDKViM (ORCPT ); Sat, 11 Apr 2020 17:38:12 -0400 Received: by mail-il1-f200.google.com with SMTP id c10so6255741ilq.8 for ; Sat, 11 Apr 2020 14:38:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=qVLd3Bd3uBVfJRLs8SbZxIzd9JmqnZ3Z/DLvPZ5BOss=; b=GTHCwl7Lzl0crCQ+91y41IfehLFUxbHA9ZtqONKUqVAkUwjNj5YWi6I0QuL/176gaf EdbLax/3eV5/d8Zn0SX1lAXhoOU6Zk8sG0japOCqdziruvExMMNMxbFITk95MHDh1oRc AL76cX30z1tBXxVy+t3e7x1ii5NoNe5AqigHU46Ocwx0kh+gp9eQJryUvm+xjW8JkSy/ c47mIpAzfL9pzTNSolhs8SNbEgh5xptEz5JWrJRBiHT6nqcepttYOKRWj5tfDykbU2rJ PgUzal1Fx1i4q4hWVBXUBqeO84w/V2z2leCXXl15g0b3POO5rE9RfMh2wJjp+En1VF7G uxGA== X-Gm-Message-State: AGi0PubwpjieEk5g06pj5gpU6ZRKiAws/o0ZHOsCKEf1+ukdjxfO1iui 9l2rcF1CWPB1oJrwth9CvzD8fASDIna4qLmHnO9+yrkvMI1b X-Google-Smtp-Source: APiQypKE0T7vpFvxOcOZvzhUT6OjWfzmqF/bePj9rviDb2ldU3gKgTG6RE46xsPctletAp6kcGWYAiCQogSANoSlVc30WUqilVoK MIME-Version: 1.0 X-Received: by 2002:a5d:8347:: with SMTP id q7mr10163952ior.172.1586641092063; Sat, 11 Apr 2020 14:38:12 -0700 (PDT) Date: Sat, 11 Apr 2020 14:38:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000adb83a05a30aaa04@google.com> Subject: WARNING: bad unlock balance in mptcp_shutdown From: syzbot To: davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, mathew.j.martineau@linux.intel.com, matthieu.baerts@tessares.net, mptcp@lists.01.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: f5e94d10 Merge tag 'drm-next-2020-04-08' of git://anongit... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17a5dbfbe00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ca75979eeebf06c2 dashboard link: https://syzkaller.appspot.com/bug?extid=6ebb6d4830e8f8815623 compiler: gcc (GCC) 9.0.0 20181231 (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+6ebb6d4830e8f8815623@syzkaller.appspotmail.com ===================================== WARNING: bad unlock balance detected! 5.6.0-syzkaller #0 Not tainted ------------------------------------- syz-executor.5/2215 is trying to release lock (sk_lock-AF_INET6) at: [] mptcp_shutdown+0x38b/0x550 net/mptcp/protocol.c:1889 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.5/2215: #0: ffff88804a22eda0 (slock-AF_INET6){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:358 [inline] #0: ffff88804a22eda0 (slock-AF_INET6){+.-.}-{2:2}, at: release_sock+0x1b/0x1b0 net/core/sock.c:2974 stack backtrace: CPU: 0 PID: 2215 Comm: syz-executor.5 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 __lock_release kernel/locking/lockdep.c:4633 [inline] lock_release+0x586/0x800 kernel/locking/lockdep.c:4941 sock_release_ownership include/net/sock.h:1539 [inline] release_sock+0x177/0x1b0 net/core/sock.c:2984 mptcp_shutdown+0x38b/0x550 net/mptcp/protocol.c:1889 __sys_shutdown+0xf3/0x1a0 net/socket.c:2208 __do_sys_shutdown net/socket.c:2216 [inline] __se_sys_shutdown net/socket.c:2214 [inline] __x64_sys_shutdown+0x50/0x70 net/socket.c:2214 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c889 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa67df32c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00007fa67df336d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b5e R14: 00000000004cd960 R15: 000000000076bfac --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.