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Re: [Fedora-xen] virt-viewer crashing on F11 with Xen 3.4.1



On Tue, Aug 18, 2009 at 09:21:22PM +0100, Daniel P. Berrange wrote:
> On Tue, Aug 18, 2009 at 11:18:24PM +0300, Pasi K?rkk?inen wrote:
> > On Tue, Aug 18, 2009 at 01:18:23PM +0300, Pasi Kärkkäinen wrote:
> > > On Tue, Aug 18, 2009 at 10:25:28AM +0100, Daniel P. Berrange wrote:
> > > > On Tue, Aug 18, 2009 at 11:42:00AM +0300, Pasi K?rkk?inen wrote:
> > > > > Hello.
> > > > > 
> > > > > While continuing to test pv_ops dom0 kernels I also rebuilt 
> > > > > xen-3.4.1-1 src.rpm on F11.
> > > > > 
> > > > > I'm able to virt-install new centos 5.3 domU, but it seems virt-viewer
> > > > > doesn't work. It segfaults on startup. vncviewer works though, and I'm able
> > > > > to complete the installation with vncviewer.
> > > > > 
> > > > > http://pasik.reaktio.net/fedora/virt-viewer-crash.txt
> > > > > 
> > > > > virt-viewer works when used with the default xen-3.3.1 (which is included in F11).
> > > > 
> > > > strace logs aren't much help with crashes. Try to run it under valgrind and
> > > > capture the errors, or GDB and get a stack trace
> > > > 
> > > 
> > > Yeah, I was going to try gdb next.. just didn't have time yet. Thanks.
> > > 
> > 
> > (gdb) run test2vm
> > Starting program: /usr/bin/virt-viewer test2vm
> > [Thread debugging using libthread_db enabled]
> > [New Thread 0xb7c64b70 (LWP 2802)]
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > strcmp () at ../sysdeps/i386/i686/strcmp.S:40
> > 40      ../sysdeps/i386/i686/strcmp.S: No such file or directory.
> >         in ../sysdeps/i386/i686/strcmp.S
> > Current language:  auto; currently asm
> > (gdb) bt
> > #0  strcmp () at ../sysdeps/i386/i686/strcmp.S:40
> > #1  0xb7f237d2 in virEnumFromString (types=0xb7fb7074, ntypes=2, type=0x0) at util.c:1481
> > #2  0xb7f3ce4f in virDomainGraphicsTypeFromString (type=0x0) at domain_conf.c:150
> > #3  0xb7f77490 in xenDaemonParseSxprGraphicsNew (conn=<value optimized out>, def=<value optimized out>, 
> >     root=0x8089278) at xend_internal.c:2085
> > #4  0xb7f79c44 in xenDaemonParseSxpr (conn=<value optimized out>, root=<value optimized out>, 
> >     xendConfigVersion=4, cpus=0x0) at xend_internal.c:2452
> > #5  0xb7f7d079 in xenDaemonDomainFetch (conn=0x8079ca0, domid=1, name=0x808b190 "test2vm", cpus=0x0)
> >     at xend_internal.c:3372
> > #6  0xb7f7d180 in xenDaemonDomainDumpXML (domain=0x808b168, flags=0, cpus=0x0) at xend_internal.c:3416
> > #7  0xb7f74394 in xenUnifiedDomainDumpXML (dom=0x808b168, flags=0) at xen_unified.c:1034
> > #8  0xb7f357cf in virDomainGetXMLDesc (domain=0x808b168, flags=0) at libvirt.c:2621
> > #9  0x0804c116 in viewer_extract_vnc_graphics (port=<value optimized out>, dom=<value optimized out>)
> >     at main.c:709
> > #10 viewer_start (port=<value optimized out>, dom=<value optimized out>) at main.c:906
> > #11 0x0804ca07 in main (argc=2, argv=0xbffff1d4) at main.c:1037
> > (gdb) 
> > 
> > So something has changed in Xen 3.4.x and now virEnumFromString() fails? 
> 
> Yeah there will be something unexpected in the SEXPR from Xen, which
> then triggers a latent bug in libvirt code not doing proper sanity
> checking, resulting in the crash.  Can you file a bug against libvirt,
> and include the output of 'xm list --long $GUESTNAME' and xenstore-ls
> as attachments. It ought to be trivial to fix.
> 

Yeah I can do that.

Wondering if it's this bug:
http://www.mail-archive.com/libvir-list redhat com/msg14082.html

At least that patch adds check for type == 0, and that's what I have here..

-- Pasi


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