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Created attachment 803188 [details] back trace of libvirtd crashed. Description libvirtd crashed when edit "backend model='egd' type='unix'" to guest xml file Version: libvirt-1.1.1-6.el7.x86_64 qemu-kvm-1.5.3-3.el7.x86_64 How reproducible: 100% Steps to Reproduce: # virsh edit guest add following xml to guest: " <rng model='virtio'> <rate bytes='1234' period='2000'/> <backend model='egd' type='unix'> <source mode='bind' service='1024'/> <source mode='connect' host='10.66.7.179' service='1024'/> </backend> </rng> " save then : error: End of file while reading data: Input/output error Failed. Try again? [y,n,f,?]: error: One or more references were leaked after disconnect from the hypervisor error: Failed to reconnect to the hypervisor Actual results： libvirtd crashed. Expected results: libvirtd not crash.
Fix posted upstream https://www.redhat.com/archives/libvir-list/2013-September/msg01551.html
This issue is now fixed upstream: commit 795527548fea79902ea4ce32747e069944cf3e61 Author: Peter Krempa <pkrempa> Date: Thu Sep 26 08:12:39 2013 +0200 conf: Don't crash on invalid chardev source definition of RNGs and other Since commit 297c99a5 an invalid source definition XML of a character device that is used as backend for RNG devices, smartcards and redirdevs causes crash of the daemon when parsing such a definition. The device types mentioned above are not a part of a regular character device but are backends for other types. Thus when parsing such device NULL is passed as the argument @chr_def. Later when checking the validity of the definition @chr_def was dereferenced when parsing a UNIX socket backend with missing path of the socket and crashed the daemon. Sample offending configuration: <devices> ... <rng model='virtio'> <backend model='egd' type='unix'> <source mode='bind' service='1024'/> </backend> </rng> </devices>
Reproduced with libvirt-1.1.1-6.el7.x86_64, Verified with package: libvirt-1.1.1-8.el7.x86_64 Test steps: 1. # virsh edit guest add following xml to guest: <rng model='virtio'> <rate bytes='1234' period='2000'/> <backend model='egd' type='unix'> <source mode='bind' service='1024'/> <source mode='connect' host='10.66.7.179' service='1024'/> </backend> </rng> save then: error: internal error: Missing source path attribute for char device Failed. Try again? [y,n,f,?]: 2. #virsh edit guest add following xml to guest: <rng model='virtio'> <backend model='egd' type='unix'> <source mode='bind' service='1024'/> </backend> </rng> save then: error: internal error: Missing source path attribute for char device Failed. Try again? [y,n,f,?]: Test results: no libvirt crash, change the status to VERIFIED
This request was resolved in Red Hat Enterprise Linux 7.0. Contact your manager or support representative in case you have further questions about the request.