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Re: [Qemu-devel] [PATCH] migrate: Migration aborts abruptly for machine

From: Ashijeet Acharya
Subject: Re: [Qemu-devel] [PATCH] migrate: Migration aborts abruptly for machine "none"
Date: Sun, 29 Jan 2017 01:06:47 +0530

On Sun, Jan 29, 2017 at 12:11 AM, Greg Kurz <address@hidden> wrote:
> On Thu, 26 Jan 2017 14:46:52 +0530
> Ashijeet Acharya <address@hidden> wrote:
>> Migration of a "none" machine with no RAM crashes abruptly as
>> bitmap_new() fails and thus aborts. Instead, place a check for
>> last_ram_offset() being '0' at the start of ram_save_setup() and
>> error out with a meaningful error message.
>> Signed-off-by: Ashijeet Acharya <address@hidden>
>> ---

cc'ing Paolo in : I had an IRC chat with him and he has a very
interesting twist in the tale to add here.

> Maybe a naive question: why a "none" machine with zero RAM should fail to
> migrate ?

Assuming you are referring to why its failing ATM; it fails because
g_try_malloc0() inside bitmap_try_new() returns a NULL pointer for
zero bits and thus the check for NULL inside bitmap_new() becomes true
and it aborts. Check bitmap_new() for convenience.

Ignore the noise if you already knew this! :-)


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