This was reported by Oleg Bondarev on libvirt-users https://www.redhat.com/archives/libvirt-users/2014-April/msg00124.html It was easily reproduced on an F20 system - in short, if you start a domain that has an interface containing any <filterref>, then attempt to remove that filterref using "virsh update-device --live", libvirtd will crash. The gdb backtrace to aid anyone encountering the crash and doing a search: #0 __strcmp_ssse3 () at ../sysdeps/x86_64/strcmp.S:210 #1 0x00007f716cc65017 in virNWFilterObjFindByName ( nwfilters=nwfilters@entry=0x7f714803a900, name=name@entry=0x0) at conf/nwfilter_conf.c:2716 #2 0x00007f7153c49f92 in __virNWFilterInstantiateFilter ( driver=driver@entry=0x7f714803a8d0, vmuuid=vmuuid@entry=0x7f7148288638 "\257`Y\277\216\226K\031\224\266\016\v\225\374T\344@\214(Hq\177", teardownOld=teardownOld@entry=true, ifname=0x7f713c015e50 "vnet2", ifindex=37, linkdev=linkdev@entry=0x0, macaddr=macaddr@entry=0x7f713c002e24, filtername=0x0, filterparams=0x0, useNewFilter=useNewFilter@entry=INSTANTIATE_ALWAYS, forceWithPendingReq=forceWithPendingReq@entry=false, foundNewFilter=foundNewFilter@entry=0x7f715b5538b7) at nwfilter/nwfilter_gentech_driver.c:812 #3 0x00007f7153c4a7e2 in _virNWFilterInstantiateFilter ( driver=0x7f714803a8d0, vmuuid=0x7f7148288638 "\257`Y\277\216\226K\031\224\266\016\v\225\374T\344@\214(Hq\177", net=0x7f713c002e20, teardownOld=teardownOld@entry=true, useNewFilter=useNewFilter@entry=INSTANTIATE_ALWAYS, foundNewFilter=foundNewFilter@entry=0x7f715b5538b7) at nwfilter/nwfilter_gentech_driver.c:922 #4 0x00007f7153c4a94b in virNWFilterInstantiateFilter ( driver=<optimized out>, vmuuid=<optimized out>, net=<opti
Patch posted upstream: http://www.redhat.com/archives/libvir-list/2014-May/msg00005.html
I've pushed this upstream both to the head of master, as well as to all existing -maint branches as far back as v1.0.2-maint (there is no v1.0.1-maint branch) commit 0eac9d1e90fc3388030c6109aeb1f4860f108054 Author: Laine Stump <laine> Date: Thu May 1 11:40:41 2014 +0300 qemu: fix crash when removing <filterref> from interface with update-device If a domain network interface that contains a <filterref> is modified "live" using "virsh update-device --live", libvirtd would crash. This was because the code supporting live update of an interface's filterref was assuming that a filterref might be added or modified, but didn't account for removing the filterref, resulting in a null dereference of the filter name. Introduced with commit 258fb278, which was first in libvirt v1.0.1.
libvirt-1.1.3.5-1.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/libvirt-1.1.3.5-1.fc20
Package libvirt-1.1.3.5-1.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing libvirt-1.1.3.5-1.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-6018/libvirt-1.1.3.5-1.fc20 then log in and leave karma (feedback).
libvirt-1.1.3.5-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.