Re: panic with -CURRENT _at_Boot [r259130]

On 10.12.13 03:52, Larry Rosenman wrote:
> On 2013-12-09 16:04, Aleksandr Rybalko wrote:
>> On Mon, 9 Dec 2013 10:36:34 -0600
>> Larry Rosenman <ler_at_lerctr.org> wrote:
>>
>>>
>>> Path: .
>>> Working Copy Root Path: /usr/src
>>> URL: svn://svn.freebsd.org/base/head
>>> Relative URL: ^/head
>>> Repository Root: svn://svn.freebsd.org/base
>>> Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
>>> Revision: 259130
>>> Node Kind: directory
>>> Schedule: normal
>>> Last Changed Author: ray
>>> Last Changed Rev: 259130
>>> Last Changed Date: 2013-12-09 09:28:34 -0600 (Mon, 09 Dec 2013)
>>>
>> [[cut]]
>>
>> Can you please share core and kernel with modules.
>> I'm not sure, but looks like it is related to vt (newcons).
>> So I have to investigate.
>>
>> Thanks!
>>
>> WBW
> I've passed ray_at_ credentials to get at the core/kernel/etc on the system 
> that generated it.

I have a +2, the same panic as Larry plus another one on my Thinkpads.

The second panic looks like this:


Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xffffffff807b8147
stack pointer           = 0x28:0xfffffe00dd97f8e0
frame pointer           = 0x28:0x333231302f2e2d2c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1132 (vidcontrol)


I 'fixed' this with the attached patch. I have to test tomorrow if the
first panic (the one Larry sees) on my Dell also goes away with this 'fix'.

I compared with syscons.c and there the ival/data assigment is always
done inside the case label and not at the end.

maybe I'm papering over ... but at least a starting point to investigate.

Andreas