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 1D4C8C83004 for ; Tue, 28 Apr 2020 04:55:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0245420661 for ; Tue, 28 Apr 2020 04:55:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726338AbgD1EzT (ORCPT ); Tue, 28 Apr 2020 00:55:19 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:49403 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725792AbgD1EzS (ORCPT ); Tue, 28 Apr 2020 00:55:18 -0400 Received: by mail-il1-f200.google.com with SMTP id z18so21921976ilp.16 for ; Mon, 27 Apr 2020 21:55:16 -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=9lT/0KhJbhdFCWET24hPlWEPdDkGKOlKMSulFeVo/pc=; b=aE9DfucGVrn0lIxcSSw5/Jbjv0N59n6M3G/nQGLtMQMEppF92ea+5sFqp6BeOewIC+ kMDrVnInOIajtuhHtBxIxUdWWil6tjzED3scbUTwT24w9K+iZsaPVr+zIWwHlp7Slb9F 9J04Ear9OV1HOgJxu6u0+O8W4vwHznvLf/5w60zYcW0QXAP8RCTg7daunfEkb/NczlCg PXo9eoUMUtbok5OAWC3S5Q8Uj76pxeF8TPQCUgOzUPGjjopm+PEKjEls3q0nbCt5UUEK IiMtLlSwdC7HqUXiaQHxWzkxQvutwVFdMhUGMTjBzsNI6GDMRe4Yjs0PZfIg59p4MKlv xJsA== X-Gm-Message-State: AGi0PuaO1ykA6qSjF/bjXgRpMhpxLgisU/zgCABQIXLnH7WwTuYomoh3 9tpzQ02EqUV1W4Xk7Y8ODgDQyhGOVoAdqw4jWRoakYL7zkQe X-Google-Smtp-Source: APiQypK/7QIDeHnrv4sVkoxXejYnJlgztxzRKQNReLR1VStIjXuplBygPaz6ebMuQqT8dGQGWUK3rjiXNGxFMlKN1r7JN44dZN84 MIME-Version: 1.0 X-Received: by 2002:a5d:9505:: with SMTP id d5mr24216054iom.185.1588049716016; Mon, 27 Apr 2020 21:55:16 -0700 (PDT) Date: Mon, 27 Apr 2020 21:55:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000357a2005a452a302@google.com> Subject: stack segment fault in redraw_screen From: syzbot To: daniel.vetter@ffwll.ch, ebiggers@google.com, gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, sam@ravnborg.org, syzkaller-bugs@googlegroups.com 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: b2768df2 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17bb4fc8100000 kernel config: https://syzkaller.appspot.com/x/.config?x=78a7d8adda44b4b dashboard link: https://syzkaller.appspot.com/bug?extid=a2ae636def3ebbeae7c1 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) 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+a2ae636def3ebbeae7c1@syzkaller.appspotmail.com stack segment: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events console_callback RIP: 0010:add_softcursor drivers/tty/vt/vt.c:865 [inline] RIP: 0010:set_cursor drivers/tty/vt/vt.c:907 [inline] RIP: 0010:redraw_screen+0xe44/0x16f0 drivers/tty/vt/vt.c:1025 Code: 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 e0 9c b6 fd 4c 8b 2b 4c 89 ed 48 c1 ed 03 48 bb 00 00 00 00 00 fc ff df <8a> 44 1d 00 84 c0 0f 85 90 07 00 00 45 0f b7 75 00 4c 89 64 24 18 RSP: 0018:ffffc90000cbfbc0 EFLAGS: 00010206 RAX: 1ffff1100860827e RBX: dffffc0000000000 RCX: ffff8880a99a4140 RDX: 0000000000000000 RSI: 00000000000000c0 RDI: ffff888043041000 RBP: 000000001fffffee R08: ffffffff83faa792 R09: ffffed10148b8a84 R10: ffffed10148b8a84 R11: 0000000000000000 R12: ffff888043041000 R13: 00000000ffffff70 R14: 1ffff1100860829a R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005633a6f64f08 CR3: 00000000a2ddc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: complete_change_console+0xb1/0x720 drivers/tty/vt/vt_ioctl.c:1274 console_callback+0x106/0x330 drivers/tty/vt/vt.c:2844 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414 kthread+0x353/0x380 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 2eb94778444607de ]--- RIP: 0010:add_softcursor drivers/tty/vt/vt.c:865 [inline] RIP: 0010:set_cursor drivers/tty/vt/vt.c:907 [inline] RIP: 0010:redraw_screen+0xe44/0x16f0 drivers/tty/vt/vt.c:1025 Code: 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 e0 9c b6 fd 4c 8b 2b 4c 89 ed 48 c1 ed 03 48 bb 00 00 00 00 00 fc ff df <8a> 44 1d 00 84 c0 0f 85 90 07 00 00 45 0f b7 75 00 4c 89 64 24 18 RSP: 0018:ffffc90000cbfbc0 EFLAGS: 00010206 RAX: 1ffff1100860827e RBX: dffffc0000000000 RCX: ffff8880a99a4140 RDX: 0000000000000000 RSI: 00000000000000c0 RDI: ffff888043041000 RBP: 000000001fffffee R08: ffffffff83faa792 R09: ffffed10148b8a84 R10: ffffed10148b8a84 R11: 0000000000000000 R12: ffff888043041000 R13: 00000000ffffff70 R14: 1ffff1100860829a R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005633a6f64f08 CR3: 00000000a2ddc000 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.