[ovs-discuss] Crash in openvswitch 2.0.2

[Marco Kuendig]

thanks James for the answer. No problem. 

Let me know if I can test anything and I will give it a try.

cheers
marco


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> On 20 Apr 2015, at 17:23, James Page <james.page at ubuntu.com> wrote:
> 
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> Hi Marco
> 
> Not ignoring you - just a bit busy with Ubuntu 15.04 release at the
> moment - so apologies for any lag.
> 
> On 16/04/15 21:13, Marco Kuendig wrote:
>> #2  0x0000000000460cd2 in format_odp_key_attr
>> (a=a at entry=0x19798d4, ma=ma at entry=0x0, ds=ds at entry=0x7ffc6c10bd10,
>> verbose=verbose at entry=true) at ../lib/odp-util.c:1332
> 
> The thing that has us puzzled is why at this point in the stack is the
> automatic variable 'is_exact' not true:
> 
>    case OVS_KEY_ATTR_UNSPEC:
>    case __OVS_KEY_ATTR_MAX:
>    default:
>        format_generic_odp_key(a, ds);
>        if (!is_exact) {
>            ds_put_char(ds, '/');
>            format_generic_odp_key(ma, ds);
>        }
>        break;
>    }
> 
> As the 'ma' parameter is 0, this should mean that is_exact follows:
> 
>    is_exact = ma ? odp_mask_attr_is_exact(ma) : true;
> 
> and as ma == 0 then is_exact should == true.  But for some reason its no
> t.
> 
> As you see this with the un-optimized package, we can't blame the
> optimizer - so something else must be happening - maybe an overflow?
> 
> That would have to happen in L952->L978 so not a huge amount of scope.
> 
> It might be good to see if we can determine whether namebuf is the
> culprit.
> 
> - -- 
> James Page
> Ubuntu and Debian Developer
> james.page at ubuntu.com
> jamespage at debian.org
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