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From: Janick.Taillandier@ratp.fr (Janick TAILLANDIER)
Message-Id: <199612042137.WAA22931@minos.noisy.ratp>
Subject: Trap 12
To: freebsd-smp@freebsd.org
Date: Wed, 4 Dec 1996 22:37:21 +0100 (MET)
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Hello,

I have installed the latest patches and I am still having trap 12
a few seconds after starting the second CPU. Everything seems ok 
with only one CPU.
The machine is a Dell Optiplex GXpro with 2 P6 200 MHz, 32MB,
SCSI disk on Adaptec 2940UW.

I am using the following options :

options         SMP
options         "NCPU=2"
options         APIC_IO
options         "NBUS=3"
options         "NAPIC=1"
options         "NINTR=36"
options         SMP_INVLTLB

With all these options, here is what I get :

Stopped at _pmap_enter+0x8f:          movl   0(%ecx),%ecx

trace gives:

_pmap_enter(f13ad064,efbfd000,17c8000,7,0) at  _pmap_enter+0x8f
_vm_fault(f13ad000,efbfd000,3,0,0) at _vm_fault+xxd`b
_trap_pfault(efbfffbc,1) at _trap_pfault+0xd4
_trap(27,27,50274,1,efbfd5F4) at _trap+0x14b
calltrap() at calltrap+0x1a
--- trap 12, eip = 0xe9fc, ebp =0xefbfd5f4 ---
--- curproc = 0xf13e9a00, pid = 1561 ---

I have similar crash without APIC_IO or SMP_INVLTLB.

Janick