qemuDomainDefFormatBufInternal function wasn't testing whether the CPU was actually defined in the XML and saving such a domain resulted in the following backtrace: 0 in qemuDomainMakeCPUMigratable (cpu=0x0) 1 in qemuDomainDefFormatBufInternal() 2 in qemuDomainDefFormatXMLInternal() 3 in qemuDomainDefFormatLive() 4 in qemuDomainSaveInternal() 5 in qemuDomainSaveFlags() 6 in qemuDomainSave() 7 in virDomainSave() Signed-off-by: Erik Skultety <eskultet(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index e14b414518..ed2a5cc7b6 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -9105,7 +9105,7 @@ qemuDomainDefFormatBufInternal(virQEMUDriverPtr driver, goto cleanup; } - if (qemuDomainMakeCPUMigratable(def->cpu) < 0) + if (def->cpu && qemuDomainMakeCPUMigratable(def->cpu) < 0) goto cleanup; } -- 2.23.0