From: Lei Yang <yanglei209(a)huawei.com&gt; In process of iothread hotplug, qemuDomainHotplugAddIOThread() calls qemuProcessSetupIOThread(). When qemuProcessSetupIOThread() returned a failure, only the cgroup directory 'iothread' was cleaned up within the function. Right after that qemuDomainHotplugAddIOThread() would return failure directly without rolling back the livedef and iothread process that created previously. Further, when 'virsh schedinfo domain --live' requires schedinfo of such machine, the interface will always return a failure print as follows: 'Failed to create v1 controller cpu for group: No such file or directory'. The reason is qemuGetIOThreadsBWLive() using member vm->def->iothreadids[0]->iothread_id to findout the corresponding cgroup dircetory. In case mentioned previously, iothreadids[0] was not been cleaned up while whose cgroup directroy has already been removed. This patch rolls back the livedef and iothread process after qemuProcessSetupIOThread() returned a failure. Of course we are not limited to this function, we also perform the same rolling back after any exception proecss in qemuDomainHotplugAddIOThread(). Signed-off-by: Lei Yang <yanglei209(a)huawei.com&gt; Signed-off-by: Wang Xin <wangxinxin.wang(a)huawei.com&gt; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c old mode 100644 new mode 100755 index f1f961c51c..4f09e82a13 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -5293,6 +5293,7 @@ qemuDomainHotplugAddIOThread(virQEMUDriver *driver, qemuMonitorIOThreadInfo **new_iothreads = NULL; virDomainIOThreadIDDef *iothrid; virJSONValue *props = NULL; + bool objectHasAdded = false; if (!(alias = g_strdup_printf("iothread%u", iothread_id))) return -1; @@ -5305,6 +5306,8 @@ qemuDomainHotplugAddIOThread(virQEMUDriver *driver, if (qemuMonitorAddObject(priv->mon, &props, NULL) < 0) goto exit_monitor; + objectHasAdded = true; + exp_niothreads++; /* After hotplugging the IOThreads we need to re-detect the @@ -5352,6 +5355,13 @@ qemuDomainHotplugAddIOThread(virQEMUDriver *driver, ret = 0; cleanup: + if (ret < 0 && objectHasAdded) { + qemuDomainObjEnterMonitor(driver, vm); + if (qemuMonitorDelObject(priv->mon, alias, true) < 0) + VIR_WARN("del iothread %d of %s failed when cleanup", iothread_id, vm->def->name); + ignore_value(qemuDomainObjExitMonitor(driver, vm)); + } + if (new_iothreads) { for (idx = 0; idx < new_niothreads; idx++) VIR_FREE(new_iothreads[idx]); @@ -5360,6 +5370,8 @@ qemuDomainHotplugAddIOThread(virQEMUDriver *driver, virDomainAuditIOThread(vm, orig_niothreads, new_niothreads, "update", ret == 0); virJSONValueFree(props); + if (ret < 0) + virDomainIOThreadIDDel(vm->def, iothread_id); return ret; exit_monitor: -- 2.26.0.windows.1