Subject: Re: Processor correctavke error?
To: Jason Thorpe <firstname.lastname@example.org>
From: Michael T. Stolarchuk <email@example.com>
Date: 06/10/1998 20:17:04
In message <199806102354.QAA26047@lestat.nas.nasa.gov>, Jason Thorpe writes:
>On Wed, 10 Jun 1998 16:45:45 -0700 (MST)
> Tim Rightnour <firstname.lastname@example.org> wrote:
> > fatal user trap:
> > trap entry = 0x2 (memory management fault)
> > a0 = 0xffffffffc8000004
> > a1 = 0x1
> > a2 = 0x1
> > pc = 0x1200205b0
> > ra = 0x12001a8d4
> > curproc = 0xfffffe0000229c00
> > pid = 22188, comm = make
> > Is this just a really long way of saying "SIGBUS" ? I got 2 of these (from the
> > same make pid) while compiling current this afternoon.
>No... if it had been an error in user space, it would have been SIGSEGV. But
>the address (a0) is in kernel space.
>Let's take a look at what we have here:
> a0 == 0xffffffffc8000004. That is in K1SEG, i.e. a mapped kernel
> a1 == 1. That means "access violation". The address is mapped
> and valid, but the user is not allowed to access it. (Makes sense;
> it's a kernel address :-)
> a2 == 1. That means "during a store".
ok, how do you interpret the pc address? is that in user space?
i have no idea yet, but is the kernel mapped while in user space?
if so, could it be the user space trying to do a store in kernel space?
What's the ra value indicate?