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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 7D03BC43387 for ; Tue, 8 Jan 2019 06:40:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C0E02087E for ; Tue, 8 Jan 2019 06:40:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727996AbfAHGkE (ORCPT ); Tue, 8 Jan 2019 01:40:04 -0500 Received: from mail-it1-f198.google.com ([209.85.166.198]:35386 "EHLO mail-it1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727961AbfAHGkD (ORCPT ); Tue, 8 Jan 2019 01:40:03 -0500 Received: by mail-it1-f198.google.com with SMTP id v188so2897915ita.0 for ; Mon, 07 Jan 2019 22:40:03 -0800 (PST) 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=N7MAIkCdjy9BI09dEx01pMPuwa7sPa8Pwqcod+00hfM=; b=IH+5lLuF5ejWyAqhkqqiMwsl1Iz/Bacj9yC7t5nIUm2PaH7X6kwTCoquNn3RNEkMof KGk4zMU/9s2RP5TVWkymkaQOt7nsq8ngKj40hRt0XMzHqgSsWH7nU8kXKjiLv2y02VCY h1Cvdb26oOgO8P7vdOnI/fzQ/SWnD1SDGjvBFFJT67RTn4DQL9jvzGC0vZmB4FzT/EJo mBQldUUp1mra4FWRDjgIAmH0FwMfgz55yZULJBGesyMOVjpz2q2xD9gAt9aGnhtgl3n9 QrHuy0hXtpWHmLUqY4CvyR12I8F/KHQQmm2b5JLhP3UyG17Lj2A/AZ4z31njfcM2XDsP bPtw== X-Gm-Message-State: AJcUukf9cUzCLythcCgrtpfgnTjG3/aesO6DGlWLLSDbPmLw+Ezj3mIm NWVOnLUb3nsDzFKeNJ08zB+4dGVIvP3vWwwJvPabNmCIRIa+ X-Google-Smtp-Source: ALg8bN4VSYmnZd90mvn+4unAAhpyQVwV6+RE4vaIDrri51goqzy0VlFyaakM45vj07Uh5fKzcIeWfdYHQPZMOgT+avyEhon+O3hZ MIME-Version: 1.0 X-Received: by 2002:a24:4e4b:: with SMTP id r72mr565050ita.18.1546929602763; Mon, 07 Jan 2019 22:40:02 -0800 (PST) Date: Mon, 07 Jan 2019 22:40:02 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000077264c057eec9ddd@google.com> Subject: general protection fault in ax25_send_control From: syzbot To: davem@davemloft.net, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, ralf@linux-mips.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=174ccdbb400000 kernel config: https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76 dashboard link: https://syzkaller.appspot.com/bug?extid=d0b03d6dbe11a950e0ce 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+d0b03d6dbe11a950e0ce@syzkaller.appspotmail.com ax25_connect(): syz-executor5 uses autobind, please contact jreuter@yaina.de ax25_connect(): syz-executor4 uses autobind, please contact jreuter@yaina.de kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN kobject: 'loop5' (000000000a8c8c40): kobject_uevent_env CPU: 0 PID: 13309 Comm: syz-executor0 Not tainted 4.20.0+ #3 kobject: 'loop5' (000000000a8c8c40): fill_kobj_path: path = '/devices/virtual/block/loop5' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_send_control+0x5a/0x560 net/ax25/ax25_subr.c:155 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 b1 04 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 28 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 83 04 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b RSP: 0018:ffff888042c377f8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000043 RCX: ffffc90005de9000 RDX: 0000000000000001 RSI: ffffffff87058725 RDI: 0000000000000008 RBP: ffff888042c37830 R08: ffff888064a5c380 R09: ffff888064a5cc48 R10: ffff888064a5c380 R11: 0000000000000000 R12: 0000000000000000 kobject: 'loop4' (000000005a2eed4e): kobject_uevent_env R13: ffff88808baaa040 R14: 0000000000000001 R15: ffff88808baaa068 FS: 00007f25a1e3a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001f01e80 CR3: 00000000a4311000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop4' (000000005a2eed4e): fill_kobj_path: path = '/devices/virtual/block/loop4' DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ax25_release+0x503/0x680 net/ax25/af_ax25.c:974 __sock_release+0xd3/0x250 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1141 __fput+0x3c5/0xaf0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 get_signal+0x168d/0x19b0 kernel/signal.c:2347 do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f25a1e39c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000048 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f25a1e3a6d4 R13: 00000000004be2ae R14: 00000000004ce648 R15: 00000000ffffffff Modules linked in: ---[ end trace dcff9655958a2d47 ]--- RIP: 0010:ax25_send_control+0x5a/0x560 net/ax25/ax25_subr.c:155 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 b1 04 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 28 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 83 04 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b RSP: 0018:ffff888042c377f8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000043 RCX: ffffc90005de9000 RDX: 0000000000000001 RSI: ffffffff87058725 RDI: 0000000000000008 RBP: ffff888042c37830 R08: ffff888064a5c380 R09: ffff888064a5cc48 R10: ffff888064a5c380 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88808baaa040 R14: 0000000000000001 R15: ffff88808baaa068 FS: 00007f25a1e3a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff3c6de5db8 CR3: 00000000a4311000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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#bug-status-tracking for how to communicate with syzbot.