From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-f70.google.com ([209.85.166.70]:46469 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725880AbeLCXKG (ORCPT ); Mon, 3 Dec 2018 18:10:06 -0500 Received: by mail-io1-f70.google.com with SMTP id n25so12659394iog.13 for ; Mon, 03 Dec 2018 15:10:05 -0800 (PST) MIME-Version: 1.0 Date: Mon, 03 Dec 2018 15:10:05 -0800 Message-ID: <000000000000d803f9057c263f74@google.com> Subject: WARNING in userfaultfd_ioctl From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: d8f190ee836a Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d5f293400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4602730af4f872ef dashboard link: https://syzkaller.appspot.com/bug?extid=06c7092e7d71218a2c16 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=112711a3400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=169eb87d400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+06c7092e7d71218a2c16@syzkaller.appspotmail.com audit: type=1800 audit(1543692860.969:30): pid=5864 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 IPVS: ftp: loaded support on port[0] = 21 WARNING: CPU: 1 PID: 6019 at fs/userfaultfd.c:1569 userfaultfd_unregister fs/userfaultfd.c:1569 [inline] WARNING: CPU: 1 PID: 6019 at fs/userfaultfd.c:1569 userfaultfd_ioctl+0x3d30/0x5610 fs/userfaultfd.c:1845 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6019 Comm: syz-executor263 Not tainted 4.20.0-rc4+ #358 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+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:userfaultfd_unregister fs/userfaultfd.c:1569 [inline] RIP: 0010:userfaultfd_ioctl+0x3d30/0x5610 fs/userfaultfd.c:1845 Code: 85 c0 f6 ff ff 48 c1 e8 03 42 80 3c 30 00 0f 84 a3 fa ff ff 48 8b bd c0 f6 ff ff e8 4a 60 db ff e9 92 fa ff ff e8 20 07 98 ff <0f> 0b e9 cd f7 ff ff e8 14 07 98 ff 48 8b 95 f0 f6 ff ff b9 01 00 RSP: 0018:ffff8881c1417270 EFLAGS: 00010293 RAX: ffff8881c1e32300 RBX: 00000000080000d0 RCX: ffffffff81e77b7b RDX: 0000000000000000 RSI: ffffffff81e783b0 RDI: 0000000000000007 RBP: ffff8881c1417c00 R08: ffff8881c1e32300 R09: 0000000000000008 R10: 0000000000003cb4 R11: ffff8881c1e32300 R12: 0000000020011000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8881c2b6e460 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440ad9 Code: 23 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 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 0b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00000000007dff68 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffc8f046ee0 RCX: 0000000000440ad9 RDX: 0000000020d62fe0 RSI: 000000008010aa01 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000402270 R13: 0000000000402300 R14: 0000000000000000 R15: 0000000000000000 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. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches