[libvirt] Segfault problem with nwfilter-define in Libvirt

[Laine Stump]

On 08/08/2012 12:40 PM, [Vo2Labs] Jean-Charles Passard wrote:
> Hello,
>
> At first a big thanks to Laine, who kindly tried to help me !
>
> My problem is the following :
>
> I use a linux from scratch distro ( home made)
> pure X86_64
> glibc 2.10.1
> gcc 4.4.1
> uname -a SMP Sat Aug 4 20:07:49 CEST 2012 x86_64 x86_64 x86_64 GNU/Linux
>
> Each time I use nwfilter-define, libvirtd crash with a segfault. I
> tried nearly all version from 0.9.8 to 0.9.13 and even 0.10 with the
> same problem
> Here is a sample of newfilter.xml :
>
> <filter name='nova-base'>
>         <filterref filter='no-ip-spoofing'/>
> </filter>
>
> and here the bt unde gdb with v0.9.13
>
> #0  __pthread_mutex_lock (mutex=0x0) at pthread_mutex_lock.c:50
> #1  0x00007ffff77ba07e in virNWFilterCallbackDriversLock () at
> conf/nwfilter_conf.c:2846

I'm just doing a test build of a patch to fix this, and I'll send it as
a reply to this message when I'm done. (It contains a full explanation
of the cause of the crash).

Thanks for the complete bug report Jean Charles! This was fun to debug :-)