Re: [Qemu-devel] migration: QEMU aborts migration of "none" machine

[Thomas Huth]

On 25.01.2017 11:01, Ashijeet Acharya wrote:
> Hi Thomas,
> 
> I was able to reproduce the bug you encountered while trying to migrate
> a "none" machine.
> 
> After digging deep and debugging the problem with gdb, I found that
> bitmap_new() is the function that crashes qemu as it always has
> zero bits being passed to it.
> 
> I had a discussion with Dave on the IRC yesterday and he suggested the
> reason of crash being the absence of RAM ( since machine is "none")
> while attempting the migration.
> 
> I am not sure what the ideal solution will be in this case; Do any of
> the maintainers have any suggestions or even a starting point which I
> can ponder upon?

I'm not that familiar with the migration code either, but maybe you
could simply check for last_ram_offset() == 0 at the beginning of
ram_save_setup() and return with an error in that case?

 Thomas