2.5.40 bug related to virtual consoles

From: David Ashley (dash@xdr.com)
Date: Mon Oct 07 2002 - 17:53:40 EST


Please cc me on replies.

I'm running 2.5.40 on a cutting edge via embedded C3 motherboard. When I
turn off CONFIG_FB and CONFIG_VGA_CONSOLE I get this during bootup:
Unable to handle kernel NULL pointer dereference at virtual address 00000004
 printing eip:
c01e5a1d
*pde = 00000000
Oops: 0000
                                                                                
CPU: 0
EIP: 0060:[<c01e5a1d>] Not tainted
EFLAGS: 00010246
eax: c6ee4a00 ebx: 00000000 ecx: 00000001 edx: 00000000
esi: 00000000 edi: 00000000 ebp: c0399dc0 esp: c116fe70
ds: 0068 es: 0068 ss: 0068
Process init (pid: 1, threadinfo=c116e000 task=c116c040)
Stack: c6ee4a00 00000001 c6ee4a00 00000000 c01e5af8 00000000 00000001 00000000
       c6427000 00000000 00000401 c116fec0 c01e924f 00000000 c6427000 00000001
       c01d8b58 c6427000 c6ed9120 01024180 c6427000 c6bba2d0 00000006 c116ff70
Call Trace: [<c01e5af8>] [<c01e924f>] [<c01d8b58>] [<c014813d>] [<c013de06>] [<]
Code: ff 52 04 8b 83 c0 9d 39 c0 5a 59 66 83 78 22 00 75 17 ba 00
 <0>Kernel panic: Attempted to kill init!

This is inside drivers/char/vt.c in vc_allocate just after the visual_init
call.

Related configs are:
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_SERIAL_8250_CONSOLE=y

If I turn either CONFIG_FB or CONFIG_VGA_CONSOLE back on it boots fine.
With CONFIG_FB I don't actually have any other FB related settings on and
I never actually use the frame buffer device.

Let me know if more information is needed. Thanks!
-Dave
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