Re: tty-related oops in latest kernel(s)?

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To: Tero Roponen <teanropo@...>
Cc: <linux-kernel@...>, <akpm@...>, Alan Cox <alan@...>
Date: Monday, May 28, 2007 - 5:34 am

On 5/28/07, Pekka Enberg <penberg@cs.helsinki.fi> wrote:

[snip]

On 5/28/07, Pekka Enberg <penberg@cs.helsinki.fi> wrote:

I am getting this with your config:

(gdb) p vt_ioctl
$1 = {int (struct tty_struct *, struct file *, unsigned int, long
unsigned int)} 0xc01e404a <vt_ioctl>
(gdb) l *(0xc01e404a + 0xda8)
0xc01e4df2 is in vt_ioctl (drivers/char/vt_ioctl.c:720).
715             /*
716              * Returns the first available (non-opened) console.
717              */
718             case VT_OPENQRY:
719                     for (i = 0; i < MAX_NR_CONSOLES; ++i)
720                             if (! VT_IS_IN_USE(i))
721                                     break;
722                     ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
723                     goto setint;
724

Which seems to match the code dump in the OOPS as well. I am not sure
what %edx (which is zero and causes problems) should contain but I am
guessing tty_driver->ttys is corrupted which seems consistent with the
reference count sanity check failure. Unfortunately I am not familiar
enough with tty internals to immediately see why this is happening.
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Messages in current thread:
tty-related oops in latest kernel(s)?, Tero Roponen, (Sun May 27, 5:06 am)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Mon May 28, 3:22 am)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Mon May 28, 5:34 am)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Tue May 29, 12:04 pm)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Tue May 29, 2:57 pm)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Tue May 29, 11:57 pm)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Wed May 30, 1:54 am)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Wed May 30, 8:02 am)
Re: tty-related oops in latest kernel(s)?, Andrew Morton, (Wed May 30, 11:39 am)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Wed May 30, 12:01 pm)
Re: tty-related oops in latest kernel(s)?, Antonino A. Daplas, (Wed May 30, 7:17 pm)
Re: tty-related oops in latest kernel(s)?, Antonino A. Daplas, (Wed May 30, 6:14 pm)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Wed May 30, 2:13 pm)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Wed May 30, 2:27 pm)
Re: tty-related oops in latest kernel(s)?, Andrew Morton, (Wed May 30, 12:09 pm)
Re: tty-related oops in latest kernel(s)?, Alexey Dobriyan, (Wed May 30, 2:04 pm)
Re: tty-related oops in latest kernel(s)?, Antonino A. Daplas, (Wed May 30, 7:14 pm)
Re: [Linux-fbdev-devel] tty-related oops in latest kernel(s)?, Geert Uytterhoeven, (Thu May 31, 3:17 am)
Re: [Linux-fbdev-devel] tty-related oops in latest kernel(s)?, Antonino A. Daplas, (Thu May 31, 5:04 am)
Re: tty-related oops in latest kernel(s)?, David Miller, (Wed May 30, 7:18 pm)
Re: tty-related oops in latest kernel(s)?, Antonino A. Daplas, (Wed May 30, 7:28 pm)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Wed May 30, 2:00 am)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Wed May 30, 1:59 am)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Tue May 29, 11:43 pm)
Re: tty-related oops in latest kernel(s)?, Tero Roponen, (Mon May 28, 4:08 am)
Re: tty-related oops in latest kernel(s)?, Pekka Enberg, (Mon May 28, 3:47 am)