[libvirt] virConnectClose() sometimes seg faults libvirt 0.7.0

[Daniel Veillard]

On Wed, Aug 12, 2009 at 05:27:35PM -0700, Kaitlin Rupert wrote:
> Hi,
>
> I'm trying to track down a seg fault I'm seeing with the  
> libvirt-0.7.0-3.fc12.x86_64 rawhide version of libvirt.
>
> I'm having trouble finding the exact set of steps, as I see the behavior  
> when interacting with the libvirt-cim providers.
>
> Here's the stack trace I was able to get. Looks like the seg fault  
> actually occurs in netcf, which I haven't looked at much.  Has anyone  
> seen this?
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007fffe4004383 in ?? ()
> (gdb) bt
> #0  0x00007fffe4004383 in ?? ()
> #1  0x00007ffff6a5cbfc in xmlHashScanFull__internal_alias (
>     table=0x7fffe4005f50, f=<value optimized out>, data=<value optimized 
> out>)
>     at hash.c:849
> #2  0x00007ffff6a5cc4c in xmlHashScan__internal_alias  
> (table=0x7fffe400ef10,
>     f=<value optimized out>, data=<value optimized out>) at hash.c:818
> #3  0x00007ffff6ff5104 in xsltShutdownExts () from
> /usr/lib64/libxslt.so.1
> #4  0x00007ffff6fe3e3d in xsltFreeStylesheet () from
> /usr/lib64/libxslt.so.1
> #5  0x00007ffff7452961 in ?? () from /usr/lib64/libnetcf.so.1
> #6  0x00007ffff74501d1 in ncf_close () from /usr/lib64/libnetcf.so.1

  OMG ! You have no idea where it comes from ...
    I'm afraid it's related to
    http://bugzilla.gnome.org/show_bug.cgi?id=305913

a global variable, used in libxslt, itself used in netcf, itself used by
libvirt ....

  There is probably a workaround possible at the netcf level forcing
locking when XSLT transformations are run to avoid the multithread issue
but the real fix should be in libxslt, I'm working on libxml2/libxslt
bug fixes this week and will try to get this fixed in the next libxslt
release, hopefully by next week ... I will keep you posted !

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel at veillard.com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/