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Date: Wed, 12 Jan 2005 16:19:48 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: David Cornejo <dave@dogwood.com>
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cc: Kris Kennaway <kris@obsecurity.org>
Subject: Re: Fast Data Access MMU Miss problem
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On Wed, Jan 12, 2005 at 01:45:21PM -1000, David Cornejo wrote:
> If I can help out by running the patch or anything, let me know...

http://bmilekic.unixdaemons.com/MemGuard.diff

Add options DEBUG_MEMGUARD to your kernel and rebuild.

The panic I've found is:

panic: trap: data access protection
cpuid = 2
KDB: enter: panic
[thread pid 19876 tid 100237 ]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> tr
Tracing pid 19876 tid 100237 td 0xfffff800072fb710
panic() at panic+0x19c
trap() at trap+0x16c
-- data access protection tar=0xc169e000 sfar=0xc169e120 sfsr=0x4002d %o7=0xc0136570 --
cpu_exit() at cpu_exit+0x30
exit1() at exit1+0x82c
sys_exit() at sys_exit+0x10
syscall() at syscall+0x220
-- syscall (1, FreeBSD ELF64, sys_exit) %o7=0x1185e4 --
userland() at 0x40633cc8
user trace: trap %o7=0x1185e4
pc 0x40633cc8, sp 0x7fdffffd231

which is currently being analyzed, so if you come up with something different let me know.

Kris

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