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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 22AD3C433DF for ; Wed, 10 Jun 2020 10:56:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 091F9206F7 for ; Wed, 10 Jun 2020 10:56:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728361AbgFJK4O (ORCPT ); Wed, 10 Jun 2020 06:56:14 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:39592 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728330AbgFJK4N (ORCPT ); Wed, 10 Jun 2020 06:56:13 -0400 Received: by mail-io1-f71.google.com with SMTP id 5so1301930iou.6 for ; Wed, 10 Jun 2020 03:56:12 -0700 (PDT) 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=LwSI8L+D98YJR3RL9cyL/ndGk3cpdIv1WYci/0oBLUw=; b=Fr16uMLYAtmz4jQIms/CjxIYUR6Oy3D3Mv/xy6lR8jePeqM+kJNXxBiVQwzoFwj3D0 QgCVNnMzbKa0y4M7Zpk3M1BmZVOsUlsid/gIcxUOXOfX7WBf7YugcHnE38XHO9OMi5nw QUGmaYA6xYAb9A/oj6MjzjrrR5QOlPQ9h69eP7XsK/gcvg6mDi3CgmY3XCVFQbGMSOZu 3vJf/zTKkQZU6pAtJRA9XSbdNYzVtxwgfptp7UfM7Yvh9EIxlb4ZQ5QuZZhzSqnZlOGD Dbfn7plpnRLQyTqpmRByX2nRHFHoTl4I1xFoTuMopbgb/PHaFX+NZgvff/+AQgyOL8qf LzFg== X-Gm-Message-State: AOAM530aKH6cB6sbtLe6qkD/QCI+/1b1ocf1OP5SzlNA9jENZCS2jrlU dwgBHF6S8f7xde4OnRRA9ubgyoiZgTHrobYXxUV0TTW/bYNJ X-Google-Smtp-Source: ABdhPJzzwGUERjgq/5SoOOh/LDcmjlfsZEiRVIrdfFLs/3z0l6dwlvS07MAqvb31OSyfcta1eXTL6DXT9oNnXSkM7Ev2fD0vIplj MIME-Version: 1.0 X-Received: by 2002:a5d:87c4:: with SMTP id q4mr2660123ios.169.1591786571921; Wed, 10 Jun 2020 03:56:11 -0700 (PDT) Date: Wed, 10 Jun 2020 03:56:11 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002d7ca605a7b8b1c5@google.com> Subject: general protection fault in proc_kill_sb From: syzbot To: adobriyan@gmail.com, ebiederm@xmission.com, gladkov.alexey@gmail.com, keescook@chromium.org, 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" 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: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16e12212100000 kernel config: https://syzkaller.appspot.com/x/.config?x=d195fe572fb15312 dashboard link: https://syzkaller.appspot.com/bug?extid=4abac52934a48af5ff19 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+4abac52934a48af5ff19@syzkaller.appspotmail.com RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 R13: 0000000000000751 R14: 00000000004ca3ea R15: 00007f8970ff76d4 general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 6840 Comm: syz-executor.2 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:proc_kill_sb+0x4d/0x110 fs/proc/root.c:267 Code: c1 ea 03 80 3c 02 00 0f 85 ad 00 00 00 49 8b ac 24 68 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a1 00 00 00 4c 8b 6d 08 4d 85 ed 74 0d e8 cb 51 RSP: 0018:ffffc90007b67d48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc9000d6d1000 RDX: 0000000000000001 RSI: ffffffff81e37c9d RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c347a2f R11: fffffbfff1868f45 R12: ffff888059e1a000 R13: 00000000fffffff4 R14: 0000000000000000 R15: ffff888059e1a068 FS: 00007f8970ff7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000073c138 CR3: 00000000588dc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: deactivate_locked_super+0x8c/0xf0 fs/super.c:335 vfs_get_super+0x258/0x2d0 fs/super.c:1212 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2874 [inline] do_mount+0x1306/0x1b40 fs/namespace.c:3199 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount fs/namespace.c:3386 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3386 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca69 Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8970ff6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f62c0 RCX: 000000000045ca69 RDX: 00000000200000c0 RSI: 0000000020000200 RDI: 0000000020000340 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 R13: 0000000000000751 R14: 00000000004ca3ea R15: 00007f8970ff76d4 Modules linked in: ---[ end trace 7f26d357bd21d77e ]--- RIP: 0010:proc_kill_sb+0x4d/0x110 fs/proc/root.c:267 Code: c1 ea 03 80 3c 02 00 0f 85 ad 00 00 00 49 8b ac 24 68 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a1 00 00 00 4c 8b 6d 08 4d 85 ed 74 0d e8 cb 51 RSP: 0018:ffffc90007b67d48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc9000d6d1000 RDX: 0000000000000001 RSI: ffffffff81e37c9d RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c347a2f R11: fffffbfff1868f45 R12: ffff888059e1a000 R13: 00000000fffffff4 R14: 0000000000000000 R15: ffff888059e1a068 FS: 00007f8970ff7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f19326ab000 CR3: 00000000588dc000 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.