The cpuModels member of _virQEMUCapsAccel struct is not a virObject but regular struct with a free function defined: qemuMonitorCPUDefsFree(). Use that when clearing parent structure instead of virObjectUnref() to avoid a memleak: ==212322== 57,275 (48 direct, 57,227 indirect) bytes in 3 blocks are definitely lost in loss record 623 of 627 ==212322== at 0x4838B86: calloc (vg_replace_malloc.c:762) ==212322== by 0x554A158: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.6000.6) ==212322== by 0x17B14BF5: qemuMonitorCPUDefsNew (qemu_monitor.c:3587) ==212322== by 0x17B27BA7: qemuMonitorJSONGetCPUDefinitions (qemu_monitor_json.c:5616) ==212322== by 0x17B14B0B: qemuMonitorGetCPUDefinitions (qemu_monitor.c:3559) ==212322== by 0x17A6AFBB: virQEMUCapsFetchCPUDefinitions (qemu_capabilities.c:2571) ==212322== by 0x17A6B2CC: virQEMUCapsProbeQMPCPUDefinitions (qemu_capabilities.c:2629) ==212322== by 0x17A70C00: virQEMUCapsInitQMPMonitorTCG (qemu_capabilities.c:4769) ==212322== by 0x17A70DDF: virQEMUCapsInitQMPSingle (qemu_capabilities.c:4820) ==212322== by 0x17A70E99: virQEMUCapsInitQMP (qemu_capabilities.c:4848) ==212322== by 0x17A71044: virQEMUCapsNewForBinaryInternal (qemu_capabilities.c:4891) ==212322== by 0x17A7119C: virQEMUCapsNewData (qemu_capabilities.c:4923) Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_capabilities.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index e5f19ddcaa..f65af5c228 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -1798,7 +1798,7 @@ virQEMUCapsAccelClear(virQEMUCapsAccelPtr caps) VIR_FREE(caps->machineTypes); virQEMUCapsHostCPUDataClear(&caps->hostCPU); - virObjectUnref(caps->cpuModels); + qemuMonitorCPUDefsFree(caps->cpuModels); }