Bug 712046
| Summary: | Qemu allocates an existed macaddress to hotpluged nic | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Amos Kong <akong> |
| Component: | qemu-kvm | Assignee: | Marcelo Tosatti <mtosatti> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 6.2 | CC: | ailan, gcosta, juzhang, mkenneth, tburke, virt-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.176.el6 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-12-06 15:52:17 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 580954 | ||
This bug also exists in qemu-kvm upstream. Bug exists in qemu-kvm-0.12.1.2-2.171.el6.x86_64, and it could not be reproduced with qemu-kvm-0.12.1.2-2.176.el6.x86_64 So moving to VERIFIED. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2011-1531.html |
Description of problem: Boot up guest with no network related parameters, then guest would have a default rtl8139 nic with default macaddress(52:54:00:12:34:56). And try to hotplug a new nic to guest by monitor, but qemu also allocate (52:54:00:12:34:56) to the new nic. Version-Release number of selected component (if applicable): qemu-kvm-0.12.1.2-2.162.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. boot up guest with no network related parameters # qemu-kvm -boot n -monitor stdio (qemu) info network VLAN 0 devices: user.0: net=10.0.2.0, restricted=n rtl8139.0: model=rtl8139,macaddr=52:54:00:12:34:56 Devices not on any VLAN: 2. hotplug a new nic to guest (qemu) netdev_add tap,id=h1 (qemu) device_add virtio-net-pci,netdev=h1 3. check the network info by monitor (qemu) info network VLAN 0 devices: user.0: net=10.0.2.0, restricted=n rtl8139.0: model=rtl8139,macaddr=52:54:00:12:34:56 Devices not on any VLAN: h1: ifname=tap0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown peer=virtio-net-pci.0 virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:56 peer=h1 4. login guest and check the nic info guest)# ifconfig Actual results: The second nic got a same macaddress as 1th nic. Expected results: The second nic got a different macaddress. Additional info: default nic has a default mac address: net.c: 798 static int net_init_nic(QemuOpts *opts, 799 Monitor *mon, 800 const char *name, 801 VLANState *vlan) 802 { ..... 837 nd->macaddr[0] = 0x52; 838 nd->macaddr[1] = 0x54; 839 nd->macaddr[2] = 0x00; 840 nd->macaddr[3] = 0x12; 841 nd->macaddr[4] = 0x34; 842 nd->macaddr[5] = 0x56 + idx; ^ idx=0 hotpluged nic got mac from this function: net.c: 176 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 177 { 178 static int index = 0; 179 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 180 181 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) 182 return; 183 macaddr->a[0] = 0x52; 184 macaddr->a[1] = 0x54; 185 macaddr->a[2] = 0x00; 186 macaddr->a[3] = 0x12; 187 macaddr->a[4] = 0x34; 188 macaddr->a[5] = 0x56 + index++; ^ index=0