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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 B4039C282D7 for ; Wed, 30 Jan 2019 10:35:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F8D3218AC for ; Wed, 30 Jan 2019 10:35:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730816AbfA3KfF (ORCPT ); Wed, 30 Jan 2019 05:35:05 -0500 Received: from mail-it1-f199.google.com ([209.85.166.199]:59001 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730656AbfA3KfF (ORCPT ); Wed, 30 Jan 2019 05:35:05 -0500 Received: by mail-it1-f199.google.com with SMTP id p21so18486124itb.8 for ; Wed, 30 Jan 2019 02:35:04 -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=8CVKFpzzeIHCAPqNxKHlEmfwxxxTS4D1fzV4Sk20aMY=; b=RvohVLYFE+IFqeGob3ZR8YpfZbQ1QouL0rD+8E5soH8rDW3HCDR601yDL0Cv/ZgblV WvjqxZAeumYLtB/QnMNQ9NMejvkSEfeIFXFhjYU4WkwpEbsXSVFaXbhDmz+UPNCsDMsj VbO5uDXfVncbID3Yd7LJFopES+MNgnAG93+IIWyfxftnNwt5LQTiMfFzqAs6I7NVCaU8 Znf1a0vLCMmiG+UXMmn+q1oErpkQtomfLO1mgcYOEhRnx37PUAWBl4y724W1re/hrG0M Hp2ms5kvs7iRxxctD4BzIPbO0aznQY3zo+CoCGvzFVvPZ0xVDMQ36C4vQGGzPUoqxFB6 Q7JQ== X-Gm-Message-State: AHQUAub33u6SecEQNSY43TPmnsvv+H8Y5BIx2H8xTpd3Dc9gqUgAJ4uP Eaxx139fPm+67q5SzhU5JVHp3BP0hrYkvArEI0GS6vLr8igP X-Google-Smtp-Source: AHgI3IaE4q1p55gxMkvbxqGZrU59yz5ggRXf1T4Zc4f/Tuvn8SFYNZidgQYc6iChLUsEsPVBDGSoxrguJwyMI0hMykKgYDsBWDHb MIME-Version: 1.0 X-Received: by 2002:a24:5dd4:: with SMTP id w203mr5599578ita.8.1548844504318; Wed, 30 Jan 2019 02:35:04 -0800 (PST) Date: Wed, 30 Jan 2019 02:35:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007e10c50580aa7684@google.com> Subject: general protection fault in __dentry_path 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: 02495e76ded5 Add linux-next specific files for 20190130 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17e8d80f400000 kernel config: https://syzkaller.appspot.com/x/.config?x=a2b2e9c0bc43c14d dashboard link: https://syzkaller.appspot.com/bug?extid=7857962b4d45e602b8ad 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+7857962b4d45e602b8ad@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] PREEMPT SMP KASAN CPU: 0 PID: 445 Comm: syz-executor3 Not tainted 5.0.0-rc4-next-20190130 #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__dentry_path+0x2a5/0xaa0 fs/d_path.c:344 Code: 00 00 e8 1e 9d 9f ff 48 c7 c7 68 26 81 89 e8 72 c4 14 06 e8 0d 9d 9f ff 48 8b 85 00 ff ff ff 48 8d 78 40 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 b0 07 00 00 48 8b 85 00 ff ff ff 4c 8b 68 40 RSP: 0018:ffff8881c21bf8a8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffc90005b5c000 RDX: 0000000000002edf RSI: ffffffff81e27c43 RDI: 000000000000002f RBP: ffff8881c21bf9d0 R08: ffff88806b30a040 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881c21bf9a8 R13: 0000000000000000 R14: 0000000000009674 R15: dffffc0000000000 FS: 00007f27af88b700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f722000 CR3: 0000000218991000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dentry_path_raw+0x26/0x30 fs/d_path.c:371 kvm_uevent_notify_change.part.0+0x213/0x440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4050 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:4017 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3355 [inline] kvm_dev_ioctl+0x137a/0x1a60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3377 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f27af88ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f27af88b6d4 R13: 00000000004c0bcf R14: 00000000004d2890 R15: 00000000ffffffff Modules linked in: ---[ end trace 1701fe85f04d676b ]--- RIP: 0010:__dentry_path+0x2a5/0xaa0 fs/d_path.c:344 Code: 00 00 e8 1e 9d 9f ff 48 c7 c7 68 26 81 89 e8 72 c4 14 06 e8 0d 9d 9f ff 48 8b 85 00 ff ff ff 48 8d 78 40 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 b0 07 00 00 48 8b 85 00 ff ff ff 4c 8b 68 40 RSP: 0018:ffff8881c21bf8a8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffc90005b5c000 RDX: 0000000000002edf RSI: ffffffff81e27c43 RDI: 000000000000002f RBP: ffff8881c21bf9d0 R08: ffff88806b30a040 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881c21bf9a8 R13: 0000000000000000 R14: 0000000000009674 R15: dffffc0000000000 FS: 00007f27af88b700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001f80f70 CR3: 0000000218991000 CR4: 00000000001426f0 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#bug-status-tracking for how to communicate with syzbot.