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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 ACA7FC33CA9 for ; Tue, 14 Jan 2020 06:33:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8032220678 for ; Tue, 14 Jan 2020 06:33:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728757AbgANGdL (ORCPT ); Tue, 14 Jan 2020 01:33:11 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:33046 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726169AbgANGdL (ORCPT ); Tue, 14 Jan 2020 01:33:11 -0500 Received: by mail-il1-f197.google.com with SMTP id s9so9788402ilk.0 for ; Mon, 13 Jan 2020 22:33:11 -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=1B6lSJjlT3qeD8LwfG4NOmFDkwn4iixmNKRIjQoa5eg=; b=mAmRzzp0NwdbcGBx4KVkpkw23CMroMH9JEjUu2Dbi8uP06wgLKmFYtXk0OGNHSVtgV s+qH4GV0LQEEPNceSUQ5awSwbU9HxYAjz3zFPaGmQ4hmBnltu0pgCENicQRLLTF4axHc rV/yI6CnZFhy3bL/SkZCsaSlws5YqxQ8L9bKU0/0EmbNzta2iL2wdcOwFAxecBd8V/LZ 1B+uijkyMML4Hksh9KMMQLSlEH26nJuRzg5XSf1Z7ZRTF4Tg3VLAZkpJm8wdH4BrfuKj M9aORm53snxoUQonr7v7fnUw/r804CpzDaOdomU/VbjdszJy6R5Dnq2yQUIKfk1uiSPg FhhA== X-Gm-Message-State: APjAAAUWaorb2JKvthrei+4eLMa0HhUA6CaK1B7rbw7bSePkaSe6fTo4 MB399Op4/RRbvojzJzvrh2xwTkan44ri9busIxfvGM2VPjt0 X-Google-Smtp-Source: APXvYqzPA9c9XLOtvMAC27kM7KWkxv7n/oeTOITAnpsSmaEOmA6zr4CwynmYa1QgPjVWZpE/sB2aBOUrm6+IhgLcUYi/vd6XdtNd MIME-Version: 1.0 X-Received: by 2002:a05:6638:6a6:: with SMTP id d6mr17724624jad.132.1578983590726; Mon, 13 Jan 2020 22:33:10 -0800 (PST) Date: Mon, 13 Jan 2020 22:33:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000008132d059c13c47b@google.com> Subject: kernel BUG at fs/namei.c:LINE! 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-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: 8a28e614 Add linux-next specific files for 20200113 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12d5fa59e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c529c4d6ca1b2f3a dashboard link: https://syzkaller.appspot.com/bug?extid=79eb0f3df962caf839ed 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+79eb0f3df962caf839ed@syzkaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at fs/namei.c:684! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9764 Comm: syz-executor.0 Not tainted 5.5.0-rc5-next-20200113-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unlazy_walk+0x306/0x3b0 fs/namei.c:684 Code: ff ff ff e8 6c 3f a1 ff e8 e7 d8 b3 ff 48 c7 c6 74 6c c1 81 48 c7 c7 00 f7 ba 89 e8 e4 97 99 ff e9 d8 fe ff ff e8 ca d8 b3 ff <0f> 0b e8 c3 d8 b3 ff 0f 0b e8 bc d8 b3 ff e8 27 86 a0 ff 31 ff 89 RSP: 0018:ffffc900064cfba0 EFLAGS: 00010293 RAX: ffff88808e912040 RBX: ffffc900064cfc60 RCX: ffffffff81c16a16 RDX: 0000000000000000 RSI: ffffffff81c16ca6 RDI: 0000000000000005 RBP: ffffc900064cfbd0 R08: ffff88808e912040 R09: ffff88808e9128d8 R10: fffffbfff1549b88 R11: ffffffff8aa4dc47 R12: 0000000000000009 R13: ffffc900064cfc68 R14: ffff888096b5d9e0 R15: 0000000000000000 FS: 0000000002454940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0004a9000 CR3: 000000007d640000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: path_mountpoint.isra.0+0x1d5/0x340 fs/namei.c:2788 filename_mountpoint+0x181/0x380 fs/namei.c:2809 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2839 ksys_umount+0x164/0xef0 fs/namespace.c:1683 __do_sys_umount fs/namespace.c:1709 [inline] __se_sys_umount fs/namespace.c:1707 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1707 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d977 Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcf6064738 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d977 RDX: 0000000000403720 RSI: 0000000000000002 RDI: 00007ffcf60647e0 RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000000e R10: 000000000000000a R11: 0000000000000206 R12: 00007ffcf6065870 R13: 0000000002455940 R14: 0000000000000000 R15: 00007ffcf6065870 Modules linked in: ---[ end trace b7d2f0f09e464864 ]--- RIP: 0010:unlazy_walk+0x306/0x3b0 fs/namei.c:684 Code: ff ff ff e8 6c 3f a1 ff e8 e7 d8 b3 ff 48 c7 c6 74 6c c1 81 48 c7 c7 00 f7 ba 89 e8 e4 97 99 ff e9 d8 fe ff ff e8 ca d8 b3 ff <0f> 0b e8 c3 d8 b3 ff 0f 0b e8 bc d8 b3 ff e8 27 86 a0 ff 31 ff 89 RSP: 0018:ffffc900064cfba0 EFLAGS: 00010293 RAX: ffff88808e912040 RBX: ffffc900064cfc60 RCX: ffffffff81c16a16 RDX: 0000000000000000 RSI: ffffffff81c16ca6 RDI: 0000000000000005 RBP: ffffc900064cfbd0 R08: ffff88808e912040 R09: ffff88808e9128d8 R10: fffffbfff1549b88 R11: ffffffff8aa4dc47 R12: 0000000000000009 R13: ffffc900064cfc68 R14: ffff888096b5d9e0 R15: 0000000000000000 FS: 0000000002454940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd56da0a70 CR3: 000000007d640000 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#status for how to communicate with syzbot.