File a1f38951-libxl-mig-job.patch of Package libvirt.11695

commit a1f389515c7995ce0412f5b2413e5ec3dba4ef98
Author: Jim Fehlig <jfehlig@suse.com>
Date:   Thu Nov 13 14:41:56 2014 -0700

    libxl: acquire job in migration finish phase
    
    Moving data reception of the perform phase of migration to a
    thread introduces a race with the finish phase, where checking
    if the domain is active races with the thread finishing the
    perform phase.  The race is easily solved by acquiring a job in
    the finish phase, which must wait for the perform phase job to
    complete.
    
    While wrapping the finish phase in a job, noticed the virDomainObj
    was being unlocked in a callee - libxlDomainMigrationFinish.  Move
    the unlocking to libxlDomainMigrateFinish3Params, where the lock
    is acquired.
    
    Signed-off-by: Jim Fehlig <jfehlig@suse.com>

Index: libvirt-1.2.5/src/libxl/libxl_driver.c
===================================================================
--- libvirt-1.2.5.orig/src/libxl/libxl_driver.c
+++ libvirt-1.2.5/src/libxl/libxl_driver.c
@@ -4659,6 +4659,7 @@ libxlDomainMigrateFinish3Params(virConne
     libxlDriverPrivatePtr driver = dconn->privateData;
     virDomainObjPtr vm = NULL;
     const char *dname = NULL;
+    virDomainPtr ret = NULL;
 
 #ifdef LIBXL_HAVE_NO_SUSPEND_RESUME
     virReportUnsupportedError();
@@ -4689,16 +4690,29 @@ libxlDomainMigrateFinish3Params(virConne
         return NULL;
     }
 
+    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0) {
+        virObjectUnlock(vm);
+        return NULL;
+    }
+
     if (!virDomainObjIsActive(vm)) {
         /* Migration failed if domain is inactive */
         virReportError(VIR_ERR_OPERATION_FAILED,
                        "%s", _("Migration failed. Domain is not running "
                                "on destination host"));
-        virObjectUnlock(vm);
-        return NULL;
+        goto endjob;
     }
 
-    return libxlDomainMigrationFinish(dconn, vm, flags, cancelled);
+    ret = libxlDomainMigrationFinish(dconn, vm, flags, cancelled);
+
+ endjob:
+    if (!libxlDomainObjEndJob(driver, vm))
+        vm = NULL;
+
+    if (vm)
+        virObjectUnlock(vm);
+
+    return ret;
 }
 
 static int
Index: libvirt-1.2.5/src/libxl/libxl_migration.c
===================================================================
--- libvirt-1.2.5.orig/src/libxl/libxl_migration.c
+++ libvirt-1.2.5/src/libxl/libxl_migration.c
@@ -566,8 +566,6 @@ libxlDomainMigrationFinish(virConnectPtr
  cleanup:
     if (event)
         libxlDomainEventQueue(driver, event);
-    if (vm)
-        virObjectUnlock(vm);
     virObjectUnref(cfg);
     return dom;
 }