From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751063AbeEBHdG (ORCPT ); Wed, 2 May 2018 03:33:06 -0400 Received: from mail-io0-f198.google.com ([209.85.223.198]:50717 "EHLO mail-io0-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750895AbeEBHdC (ORCPT ); Wed, 2 May 2018 03:33:02 -0400 X-Google-Smtp-Source: AB8JxZpBqIC2wtkgz80ZpmMhiMYwTzwn5WDNKJFK7iEdxJNM+KqWhkF1fkHVrTu7PS4vE1jytq9qqwZvK6oP8+UgKK29aabdfKH/ MIME-Version: 1.0 Date: Wed, 02 May 2018 00:33:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cbaaf6056b341859@google.com> Subject: general protection fault in lo_ioctl (2) From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: fff75eb2a08c Merge tag 'errseq-v4.17' of git://git.kernel.o... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?id=5301511529693184 kernel config: https://syzkaller.appspot.com/x/.config?id=6493557782959164711 dashboard link: https://syzkaller.appspot.com/bug?extid=bf89c128e05dd6c62523 compiler: gcc (GCC) 8.0.1 20180413 (experimental) userspace arch: i386 syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?id=5000693362458624 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+bf89c128e05dd6c62523@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 10637 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #52 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:loop_set_fd drivers/block/loop.c:901 [inline] RIP: 0010:lo_ioctl+0x1ae8/0x2130 drivers/block/loop.c:1397 RSP: 0018:ffff8801bd6dfc08 EFLAGS: 00010202 RAX: 0000000000000037 RBX: ffff8801d296db00 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff84b2cd57 RDI: 00000000000001b8 RBP: ffff8801bd6dfc80 R08: ffff8801c46943c0 R09: ffffed003b5c46c2 R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801b58561a0 R15: ffff8801b58560c0 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f7f2eb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000008138024 CR3: 00000001d03df000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lo_compat_ioctl+0xc1/0x170 drivers/block/loop.c:1602 compat_blkdev_ioctl+0x3c2/0x1b20 block/compat_ioctl.c:406 __do_compat_sys_ioctl fs/compat_ioctl.c:1461 [inline] __se_compat_sys_ioctl fs/compat_ioctl.c:1407 [inline] __ia32_compat_sys_ioctl+0x221/0x640 fs/compat_ioctl.c:1407 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline] do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f32cb9 RSP: 002b:00000000f7f2e0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000004c00 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: e8 03 80 3c 08 00 0f 85 2c 02 00 00 4d 8b ad f0 00 00 00 48 b9 00 00 00 00 00 fc ff df 49 8d bd b8 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 f9 01 00 00 4d 8b ad b8 01 00 00 48 b9 00 00 RIP: loop_set_fd drivers/block/loop.c:901 [inline] RSP: ffff8801bd6dfc08 RIP: lo_ioctl+0x1ae8/0x2130 drivers/block/loop.c:1397 RSP: ffff8801bd6dfc08 ---[ end trace a15583efe355602c ]--- --- This bug is generated by a bot. 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