From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751968AbeEFA5H (ORCPT ); Sat, 5 May 2018 20:57:07 -0400 Received: from mail-it0-f72.google.com ([209.85.214.72]:43898 "EHLO mail-it0-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751846AbeEFA5D (ORCPT ); Sat, 5 May 2018 20:57:03 -0400 X-Google-Smtp-Source: AB8JxZrf8QCFzJYmcEG6DjBSzJ43sJRxbWXkwzLzEkrUZrD8oHmMoWzo9UJTB4q+HGM1SF7HnF9+lr8B+QpyURfqzSdjr1edq3CO MIME-Version: 1.0 Date: Sat, 05 May 2018 17:57:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000019f50056b7f0890@google.com> Subject: kernel panic: EXT4-fs (device loop0): panic forced after error From: syzbot To: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu 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: c1c07416cdd4 Merge tag 'kbuild-fixes-v4.17' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11a8a07b800000 kernel config: https://syzkaller.appspot.com/x/.config?x=5a1dc06635c10d27 dashboard link: https://syzkaller.appspot.com/bug?extid=a9a45987b8b2daabdc88 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=164fa297800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13635c37800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a9a45987b8b2daabdc88@syzkaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) EXT4-fs error (device loop0): ext4_iget:4756: inode #2: comm syz-executor909: root inode unallocated Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error CPU: 1 PID: 4451 Comm: syz-executor909 Not tainted 4.17.0-rc3+ #34 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 ext4_handle_error.part.120.cold.128+0x1d/0x1d fs/ext4/super.c:431 ext4_handle_error fs/ext4/super.c:408 [inline] __ext4_error_inode+0x351/0x730 fs/ext4/super.c:494 ext4_iget+0xe82/0x3dd0 fs/ext4/inode.c:4756 ext4_fill_super+0x733c/0xd810 fs/ext4/super.c:4208 mount_bdev+0x30c/0x3e0 fs/super.c:1164 ext4_mount+0x34/0x40 fs/ext4/super.c:5740 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x442dda RSP: 002b:00007ffdadaf1e38 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442dda RDX: 0000000020000480 RSI: 0000000020000100 RDI: 00007ffdadaf1e40 RBP: 0000000000000004 R08: 0000000020000440 R09: 000000000000000a R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000401c40 R13: 0000000000401cd0 R14: 0000000000000000 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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. 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 If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. 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.