[libvirt] Re: Libvirt PHP binding

[Daniel P. Berrange]

On Tue, Apr 14, 2009 at 04:00:18PM +0100, Daniel P. Berrange wrote:
> On Tue, Apr 14, 2009 at 03:56:28PM +0200, Radek Hladik wrote:
> > 
> > When running from command line everything seems to work fine. This is of 
> > course singlethreaded and potential resource leaks need not to cause a 
> > problem. However when running from webserver, the result is much more 
> > interesting. When connecting to qemu:///system (via local socket) using
> > <?
> > libvirt_connect($uri,true);
> > ?>
> > I can crash the libvirt daemon after cca 10 page reloads - sometimes 
> > with message
> > Apr 13 15:32:44 kvmtest kernel: libvirtd[8263]: segfault at 4 ip 
> > 00000039d7223fc0 sp 00007fa6fbc29a88 error 6 in 
> > libdbus-1.so.3.4.0[39d7200000+3c000]
> > in system log, sometimes without any message.
> 
> Crashing the libvirtd daemon is not your fault !  It is supposed to be
> completely robust against whatever bad stuff the client may throw at
> it. So even if the client has a bug, then it shouldn't crash the daemon.
> 
> If possible it'd be helpful if you can get a stack trace from the daemon.
> You can do this by stopping the demon '/etc/init.d/libvirtd stop' and
> then running it under GDB directly
> 
>   'gdb /usr/sbin/libvirtd'
> 
> make sure you have libvirt-debuginfo RPM installed if using Fedora, or 
> have built with '-g' debug option if built manually.

Actually now that I remember, there were a definitely a couple of
libvirtd crashing bugs in the 0.6.0 release. So well worth upgrading
before trying to debug this in any detail

> > httpd-2.2.11-6.x86_64
> > php-5.2.9-1.fc11.x86_64
> > php-devel-5.2.9-1.fc11.x86_64
> > libvirt-0.6.0-2.fc11.x86_64
> > qemu-0.9.1-12.fc11.x86_64
> > libvirt-devel-0.6.0-2.fc11.x86_64
> 
> I'd recommend updating to the latest libvirt 0.6.2 release that should be
> available in rawhide now. It fixed quite a few crashes & leaks, which 
> you may be unlucky enough to be hitting


Daniel
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