Hi, when trying to undefine a running qemu domain the domain name gets corrupted: $ ./virsh undefine system1 Name: /�em1 libvir: QEMU error /�em1: internal error cannot delete active domain error: Failed to undefine domain system1 the reaseon is that in qemud/remote.c the domain is freed after failure: remoteDispatchDomainUndefine (struct qemud_server *server ATTRIBUTE_UNUSED, ... { ... if (virDomainUndefine (dom) == -1) { virDomainFree(dom); return -1; } ... } This doesn't work out since remoteDispatchClient accesses the dom structure that was stored in the virtErrorPtr structure to report the error back to the client (This is just an example and hits any error path of functions in remote_dispatch_proc_switch.h that reference dom). There are two possible solutions I see: move the virtDomainFree down to the bottom of remoteDispatchClient or deep copy the dom structure in virDefaultErrorFunc. A patch for the later is attached since similar things seem to be possible in other drivers too. -- Guido