On 12/14/2014 10:09 PM, Luyao Huang wrote: > https://bugzilla.redhat.com/show_bug.cgi?id=1174053 > > When we use attach-device to coldplug a network iscsi hostdev, > libvirt will check if there is already a device in XML. But if > the 'b' is a host iscsi hostdev and 'a' is a network iscsi hostdev > , libvirtd will crash in virDomainHostdevMatchSubsysSCSIiSCSI, > because 'b' doesn't have a hostname. > > Add a check in virDomainHostdevMatchSubsys, if the a's protocol > and b's protocol is not the same. > > backtrace like this: > > 0 0x00007f850d6bc307 in virDomainHostdevMatchSubsysSCSIiSCSI at conf/domain_conf.c:10889 > 1 virDomainHostdevMatchSubsys at conf/domain_conf.c:10911 > 2 virDomainHostdevMatch at conf/domain_conf.c:10973 > 3 virDomainHostdevFind at conf/domain_conf.c:10998 > 4 0x00007f84f6a10560 in qemuDomainAttachDeviceConfig at qemu/qemu_driver.c:7223 > 5 qemuDomainAttachDeviceFlags at qemu/qemu_driver.c:7554 > > Signed-off-by: Luyao Huang <lhuang(a)redhat.com&gt; > --- > src/conf/domain_conf.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c > index 5cf0b1a..eb63c93 100644 > --- a/src/conf/domain_conf.c > +++ b/src/conf/domain_conf.c > @@ -11184,7 +11184,9 @@ static int > virDomainHostdevMatchSubsys(virDomainHostdevDefPtr a, > virDomainHostdevDefPtr b) > { > - if (a->source.subsys.type != b->source.subsys.type) > + if (a->source.subsys.type != b->source.subsys.type || > + (a->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI && > + a->source.subsys.u.scsi.protocol != b->source.subsys.u.scsi.protocol)) While the check works - it's in the wrong place. It should be in the subsequent switch. I'll clean it up a bit and also reference the commit id that introduced the issue as part of the commit message

John > return 0; > > switch (a->source.subsys.type) { >