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,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 64990C43603 for ; Wed, 11 Dec 2019 07:12:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3947120836 for ; Wed, 11 Dec 2019 07:12:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728018AbfLKHML (ORCPT ); Wed, 11 Dec 2019 02:12:11 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:39454 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726487AbfLKHML (ORCPT ); Wed, 11 Dec 2019 02:12:11 -0500 Received: by mail-io1-f72.google.com with SMTP id u13so15108274iol.6 for ; Tue, 10 Dec 2019 23:12:10 -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=oITAxVx01UjLKT6LF7gSG0kUX8s9d4rOI6R//omwyJA=; b=YGtfwz03UzLiFJoWI/ZuNXi6uCrlgZKnEKKK8zpjwBmYx59XZk76/VildXAWqoyeQm O6vLZglcQ9rP+CaqAvTB0QKYf10yj0JVHWLjwuhrU11COYLFmiEruXINR5D6Nyq1+T2J 4qOButBa+KOqYI/cVU/0wj2kNt44WIbi+PxzNiHbQ/9OidGDYFO/VOvuApWs+1BCNS4V RWF7/5x5anN0vJdfpo/UHaWcivWtew1t5ztA6mg0cvi+P5zXcn5LfN9XjfxSn4nX0JDW ykwXtVmgAakvdCxRRFZCSgAkw9O1j5SALXY4wy6E4vViHnhiecmlaka1au9sQYoPaZtC +uig== X-Gm-Message-State: APjAAAWhAvYZElC7m9e9cz/vmflPjj5E4u1dCxOLoOmcxX5Bq/lj+0Oo E435/gNksmxu2mTPWQJf+/lDe4nOQkO3vxGfSNBeBcRe8RwQ X-Google-Smtp-Source: APXvYqzVw/tvl8u3vJhDPpFplVsPLjIxrcX9Pb/21GFnqSK10BgjwOOjIBIAtUAOAL+9RNCOMXp4sNANQ+8yz4lvi8xGyRA1gMD4 MIME-Version: 1.0 X-Received: by 2002:a02:2a8b:: with SMTP id w133mr1686532jaw.42.1576048330005; Tue, 10 Dec 2019 23:12:10 -0800 (PST) Date: Tue, 10 Dec 2019 23:12:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000dbe36f05996858db@google.com> Subject: BUG: unable to handle kernel paging request in insert_char From: syzbot To: daniel.vetter@ffwll.ch, ghalat@redhat.com, gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, nico@fluxnic.net, sam@ravnborg.org, syzkaller-bugs@googlegroups.com, textshell@uchuujin.de 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: 6794862a Merge tag 'for-5.5-rc1-kconfig-tag' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16fa0232e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d dashboard link: https://syzkaller.appspot.com/bug?extid=6a8d618862e1fc55313d 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+6a8d618862e1fc55313d@syzkaller.appspotmail.com BUG: unable to handle page fault for address: 000000010000000e #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 4626b067 P4D 4626b067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3941 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memset16 arch/x86/include/asm/string_64.h:25 [inline] RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline] RIP: 0010:insert_char+0x23d/0x400 drivers/tty/vt/vt.c:840 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc900048ef858 EFLAGS: 00010202 RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 1ffff11013834279 RSI: 000000010000000e RDI: 000000010000000e RBP: ffffc900048ef8a0 R08: ffff888077c10600 R09: ffff888077c10e90 R10: fffffbfff14f3330 R11: ffffffff8a799987 R12: 0000000000000000 R13: ffff88809c1a1000 R14: ffff88809c1a1334 R15: 000000010000000e FS: 00007fc656c1b700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000000e CR3: 000000009687a000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csi_at drivers/tty/vt/vt.c:1964 [inline] do_con_trol+0x41a6/0x61b0 drivers/tty/vt/vt.c:2431 do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797 do_con_write drivers/tty/vt/vt.c:2565 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a849 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc656c1ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a849 RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc656c1b6d4 R13: 00000000004cbd0f R14: 00000000004e59d8 R15: 00000000ffffffff Modules linked in: CR2: 000000010000000e ---[ end trace 9752a0c790a2f44f ]--- RIP: 0010:memset16 arch/x86/include/asm/string_64.h:25 [inline] RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline] RIP: 0010:insert_char+0x23d/0x400 drivers/tty/vt/vt.c:840 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc900048ef858 EFLAGS: 00010202 RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 1ffff11013834279 RSI: 000000010000000e RDI: 000000010000000e RBP: ffffc900048ef8a0 R08: ffff888077c10600 R09: ffff888077c10e90 R10: fffffbfff14f3330 R11: ffffffff8a799987 R12: 0000000000000000 R13: ffff88809c1a1000 R14: ffff88809c1a1334 R15: 000000010000000e FS: 00007fc656c1b700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000000e CR3: 000000009687a000 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#status for how to communicate with syzbot.