[gentoo-user] System cold crashing when too much memory is used?

[gentoo-user] System cold crashing when too much memory is used?

[Konstantinos Agouros]

hi,

I am running a Xen host with gentoo sources 3.4.9. I've had issues
that the box cold reboots on me and suspected memory use. Today I 
ran the following little perl script:

my $a = "a" x 1000; 
$b = $a x 1000;

while(1)
{
  $b .= $b;
}

2 Minutes about 2G swapped out (Dom0 has about 6GB of ram and lots of swap)
and boom cold boot. No panic message on the screen before.

Anybody has an idea what might be causing this?

During on of these episodes I ran memtest86 on the box without error.

CPU is an AMD Phenom 6core.

Regards,

Konstantin

-- 
Dipl-Inf. Konstantin Agouros aka Elwood Blues. Internet: elwood@agouros.de
Altersheimerstr. 1, 81545 Muenchen, Germany. Tel +49 89 69370185
----------------------------------------------------------------------------
"Captain, this ship will not survive the forming of the cosmos." B'Elana Torres

Re: [gentoo-user] System cold crashing when too much memory is used?

[Robert David]

Hi, 

what rebooted Dom0 or DomU? Have you some special need to run kernel 3.4.9, 
try 3.0.35, I dont have any issue on server with 3.0.x.

Other thing, try to disable swap and run the script. Could be disk problem or 
bus/controller problem when copying pages from swap.


Robert.



On Friday 19 of October 2012 18:45:32 Konstantinos Agouros wrote:
> hi,
> 
> I am running a Xen host with gentoo sources 3.4.9. I've had issues
> that the box cold reboots on me and suspected memory use. Today I
> ran the following little perl script:
> 
> my $a = "a" x 1000;
> $b = $a x 1000;
> 
> while(1)
> {
>   $b .= $b;
> }
> 
> 2 Minutes about 2G swapped out (Dom0 has about 6GB of ram and lots of swap)
> and boom cold boot. No panic message on the screen before.
> 
> Anybody has an idea what might be causing this?
> 
> During on of these episodes I ran memtest86 on the box without error.
> 
> CPU is an AMD Phenom 6core.
> 
> Regards,
> 
> Konstantin