[vbox-dev] Memory initialization

Michal Necasek michal.necasek at oracle.com
Tue Jul 30 08:10:44 GMT 2019

  Can you provide a simple reproduction scenario? What does one have to 
do to see this?

  A VM reset should clear memory. A caveat is that a given guest OS may 
not perform a full reset but only a soft reboot, which does not clear 

     - Michal

On 7/28/2019 10:15 PM, b38911 wrote:
> Hello all.
> I was suggested to post my question here.
> Here my doubt:
> I noticed this behavior, which is probably expected: dumping the RAM of 
> a guest (with ".pgmphystofile" command) I saw that the memory is not 
> initialized between virtual powercycle, like if there was a real 
> powerdown. Sometimes, between restarts of the guest (with a shutdown and 
> then a restart), I find some memory artifacts belonging to processes 
> that shouldn't be there.
> I assume this happens because I'm not restarting the host system, so 
> probably the RAM is just remapped, but not initialized. This is a bit 
> annoying in some case, especially if you are using the system for 
> testing purposes.
> Is there a way to force the guest to initialize the allocated RAM to 
> zero (or something else), in order to emulate a real powerdown-powerup?
> Thanks for your help.
> cips
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