trap 12 with interrupts disabled, need help

[Andrew Duane]

Obvious question: is your stack set up properly, and is it big enough?
It could be that you haven't set up a bigger kernel stack yet, and have
overrun the small boot stack that the processor was running on. Do you
know what the stack pointer is? If it is a few bytes below a page
boundary, then overrunning the stack is a good guess.

/Andrew
 
> -----Original Message-----
> From: owner-freebsd-hackers at freebsd.org [mailto:owner-freebsd-
> hackers at freebsd.org] On Behalf Of Sharad Chandra
> Sent: Friday, December 28, 2007 12:58 AM
> To: freebsd-hackers at freebsd.org
> Cc: chandrabhagat at gmail.com
> Subject: trap 12 with interrupts disabled, need help
> 
> Hi,
> 
> 	I got a message on first boot "pid <no> (<name>): trap 12 with
> interrupts
> disabled", then it hanged and hard boot is required.
> It does not appears all the time.
> 
> I tried to figure out the problem, trap 12 is stack exception, find at
the
> last
> http://www.acm.uiuc.edu/sigops/roll_your_own/i386/idt.html
> and is coming from kernel,
> The location of this message is /usr/src/
> sys/amd64/amd64/trap.c:                     "pid %ld (%s): trap %d
with
> interrupts disabled\n",
> 
> What does this exception mean, and what could be possible reason that
my
> program is doing wrong? How to handle it
> 
> Platform: freebsd 6.1 on amd64
> 
> --
> 
> Thanks
> Sharad Chandra
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