Re: System freezes when RAM is full (64-bit)

[Michal Hocko <mhocko@suse.cz>]

On Mon 01-04-13 21:14:40, Ivan Danov wrote:
> The system freezes when RAM gets completely full. By using MATLAB, I
> can get all 8GB RAM of my laptop full and it immediately freezes,
> needing restart using the hardware button.

Do you use swap (file/partition)? How big? Could you collect
/proc/meminfo and /proc/vmstat (every few seconds)[1]?
What does it mean when you say the system freezes? No new processes can
be started or desktop environment doesn't react on your input? Do you
see anything in the kernel log? OOM killer e.g.
In case no new processes could be started what does sysrq+m say when the
system is frozen?

What is your kernel config?

> Other people have
> reported the bug at since 2007. It seems that only the 64-bit
> version is affected and people have reported that enabling DMA in
> BIOS settings solve the problem. However, my laptop lacks such an
> option in the BIOS settings, so I am unable to test it. More
> information about the bug could be found at:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1162073 and
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/159356.
> 
> Best Regards,
> Ivan
> 

---
[1] E.g. by
while true
do
	STAMP=`date +%s`
	cat /proc/meminfo > meminfo.$STAMP
	cat /proc/vmscan > meminfo.$STAMP
	sleep 2s
done
-- 
Michal Hocko
SUSE Labs

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