From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753508AbeDSRGV (ORCPT ); Thu, 19 Apr 2018 13:06:21 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:38424 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753230AbeDSRGC (ORCPT ); Thu, 19 Apr 2018 13:06:02 -0400 X-Google-Smtp-Source: AB8JxZpeWRsvDLKCltz1DlHhjlD5zvsLYvGmxXRkFbDXyVIGGN/jJ1yFgn2BSOSUUgugz8JbS3dSfIC7BKgWMw0kBvreHTbH8dmn MIME-Version: 1.0 Date: Thu, 19 Apr 2018 10:06:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001558f3056a369689@google.com> Subject: WARNING in __device_add_disk 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 hit the following crash on upstream commit 87ef12027b9b1dd0e0b12cf311fbcb19f9d92539 (Wed Apr 18 19:48:17 2018 +0000) Merge tag 'ceph-for-4.17-rc2' of git://github.com/ceph/ceph-client syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=3337db851ace689ceb50 Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5356500264419328 Kernel config: https://syzkaller.appspot.com/x/.config?id=1808800213120130118 compiler: gcc (GCC) 8.0.1 20180413 (experimental) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3337db851ace689ceb50@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. RAX: ffffffffffffffda RBX: 00007fee9fefc6d4 RCX: 0000000000455329 RDX: 0000000020000000 RSI: 0000000000004c80 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000000002a2 R14: 00000000006f6fd0 R15: 0000000000000036 WARNING: CPU: 1 PID: 30128 at block/genhd.c:685 __device_add_disk+0x104a/0x1340 block/genhd.c:685 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 30128 Comm: syz-executor3 Not tainted 4.17.0-rc1+ #8 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+0x1b9/0x294 lib/dump_stack.c:113 panic+0x22f/0x4de kernel/panic.c:184 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 RIP: 0010:__device_add_disk+0x104a/0x1340 block/genhd.c:685 RSP: 0018:ffff8801b320f8a8 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8801d7fbe880 RCX: ffffc90007714000 RDX: 0000000000040000 RSI: ffffffff83434d6a RDI: 0000000000000005 RBP: ffff8801b320fa78 R08: ffff8801a9364400 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 00000000fffffff4 R13: ffff8801b320fa50 R14: ffff8801d7fbede0 R15: ffff8801d7fbe884 device_add_disk+0x22/0x30 block/genhd.c:705 add_disk include/linux/genhd.h:397 [inline] loop_add+0x70b/0x9c0 drivers/block/loop.c:1873 loop_control_ioctl+0x178/0x500 drivers/block/loop.c:1970 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455329 RSP: 002b:00007fee9fefbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fee9fefc6d4 RCX: 0000000000455329 RDX: 0000000020000000 RSI: 0000000000004c80 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000000002a2 R14: 00000000006f6fd0 R15: 0000000000000036 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.