Re: [libvirt] [PATCH 0/8] Various KVM PCI device assignment improvements

On Fri, Aug 14, 2009 at 04:09:32PM +0100, Mark McLoughlin wrote: > On Fri, 2009-08-14 at 16:41 +0200, Mirko Raasch wrote: > > Hi, > > > > thanks for you improvements. > > > > I updated libvirt with git and tried to passthrough two pci devices to a > > linux guest. > > > > <hostdev mode='subsystem' type='pci' managed='yes'> > > <source> > > <address domain='0x0000' bus='0x05' slot='0x01' function='0x0'/> > > </source> > > </hostdev> > > <hostdev mode='subsystem' type='pci' managed='yes'> > > <source> > > <address domain='0x0000' bus='0x05' slot='0x03' function='0x0'/> > > </source> > > </hostdev> > > > > In the guest, only one of them works and after the shutdown of the > > guest, i got a segfault on the host. > > > > libvirtd[15363]: segfault at 38 ip 0000000000421164 sp 00007fff59d1dfb0 > > error 4 in libvirtd[400000+6d000] > > > > I use kernel 2.6.30-4 on the host. > > > > What did i wrong? > > It's more a question of what *I* did wrong, probably :-) > > Did this work before? With what version? Is there any chance you could > use git-bisect to find out what commit introduced the regression? > > If not, please run libvirtd from the command line with LIBVIRT_DEBUG and > post the log file somewhere. Also, the guest log file > from /var/log/libvirt/qemu would help For segfault crashes, your best bet is actually to just run libvirtd under valgrind. That usually narrows down the problem more quickly than the debug modes