[Xen-devel] Problem with the domain builder

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Hi,

I tried to start a rudimentary domU but got the following failure:
Error: (2, 'Invalid kernel', 'xc_dom_find_loader: no loader found\n')
In /var/log/xen/domain-builder-ng.log I found the line:
xc_dom_check_gzip: size (zip 4575, unzip 41219) looks insane, skip gunzip
I looked at the code in libxc/xc_dom_core.c and found the following check in 
the xc_dom_check_gzip() function:
if ( (unziplen < ziplen) || (unziplen > (ziplen * 8)) )
{
        xc_dom_printf
            ("%s: size (zip %zd, unzip %zd) looks insane, skip gunzip\n",
             __FUNCTION__, ziplen, unziplen);
        return 0;
}
So my question is, where is the factor 8 came from?
In my case the image is 41219 bytes and the zipped image is 4575 bytes and 
therewith the factor is 9 and the image got not started.
I removed the second check and all went fine.

Is there a real reason for this?
Thanks.

Dietmar

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