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Date: Wed, 15 Jun 2005 12:43:22 -0700
From: Julian Elischer <julian@elischer.org>
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To: Norbert Koch <NKoch@demig.de>
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Cc: "Freebsd-Hackers@Freebsd.Org" <freebsd-hackers@freebsd.org>
Subject: Re: kernel panic in usb0; was: RE: using vkbd device
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Norbert Koch wrote:

>>>>When quickly connecting/disconnecting
>>>>        
>>>>
>>>i guess you mean here unplug the keyboard and then immediately plug it 
>>>back, right?
>>>
>>>      
>>>
>>sounds like he means "repeatedly."
>>    
>>
>
>yes
>
>  
>
>>booting with -gd drops you into the (gdb) debugger immediatly..
>>
>>I presume you have a gdb looking at the  serial port and have a
>>serial debug port defined then?
>>    
>>
>
>Yes.
>That's what I did:
>
>boot -gd && gdb -k kernel.debug && target remote /dev/cuaa0
>
>In gdb "bt" only shows two entries. The function where the panic
>occurred and 0x0!
>  
>

that is normal
you don't want to jump into gdb that soon.
there is hardly anything set up.

use the sysctl to enter gdb later.

>BTW, after boot -gd, when gdb attaches I have a kernel panic too.
>But I can just enter "continue" and the kernel continues booting.
>Is that ok?
>  
>

what do you mean "panic"?
I never use -gd, just -g

then hitting ^ALT-ESC  or using th esysctl makes me enter the debugger 
when I need to.