Suddenly poweroff in 11-Current r300097

I got a suddenly poweroff in r300097 (and previous revision in April and
May) when I built textproc/docproj.
My machine is Macbook Pro 13 2011 early. I have checked the Apple website.
My bios is the latest version.
Actually it also happened in 10.3-STABLE.
It happened when the machine load was heavy. Before it shutdown, the fan
started to run very loudly. After several seconds (20 or 30 seconds), my
laptop shutdown (poweroff directly) suddenly. It seems not happen with the
AC power supply connected.

I installed both Mac OSX and FreeBSD (dual boot). It never happened in Mac
OSX.

My dmesg:
http://pastebin.com/QjZmbGCB

My sysctl hw.acpi:

hw.acpi.acline: 0
hw.acpi.battery.info_expire: 5
hw.acpi.battery.units: 1
hw.acpi.battery.state: 1
hw.acpi.battery.time: 87
hw.acpi.battery.life: 59
hw.acpi.cpu.cx_lowest: C8
hw.acpi.reset_video: 0
hw.acpi.handle_reboot: 1
hw.acpi.disable_on_reboot: 0
hw.acpi.verbose: 0
hw.acpi.s4bios: 0
hw.acpi.sleep_delay: 1
hw.acpi.suspend_state: S3
hw.acpi.standby_state: NONE
hw.acpi.lid_switch_state: NONE
hw.acpi.sleep_button_state: S3
hw.acpi.power_button_state: S5
hw.acpi.supported_sleep_state: S3 S4 S5




My acpidump:
https://drive.google.com/open?id=0B143oZhcZhxMWHAtcGJ0VENwLTQ

Thanks

-- 
"Life is like a snowball. The important thing is finding wet snow and a
really long hill."

"Price is what you pay. Value is what you get."

"The first rule of Investing is don't lose money; the second rule is don't
forget rule #1..."

"Wall Street is the only place that people ride to work in a Rolls-Royce to
get advice from those who take the subway..."


— Warren Buffett.