[PATCH] qemu: backup: Use 'async' monitor in 'qemuBackupDiskDataCleanupOne'

[Peter Krempa <pkrempa@xxxxxxxxxx>]

'qemuBackupDiskDataCleanupOne()' is entering the monitor while we're in
the async backup job inside 'qemuBackupBegin()' which is semantically
wrong and per upstream report causes crashes if some monitoring commands
are run in parallel.

Use qemuDomainObjEnterMonitorAsync() instead.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_backup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_backup.c b/src/qemu/qemu_backup.c
index 81391c29f7..5eb2cbe306 100644
--- a/src/qemu/qemu_backup.c
+++ b/src/qemu/qemu_backup.c
@@ -125,7 +125,8 @@ qemuBackupDiskDataCleanupOne(virDomainObj *vm,

     if (!dd->started) {
         if (dd->added) {
-            qemuDomainObjEnterMonitor(vm);
+            if (qemuDomainObjEnterMonitorAsync(vm, VIR_ASYNC_JOB_BACKUP) < 0)
+                return;
             qemuBlockStorageSourceAttachRollback(priv->mon, dd->crdata->srcdata[0]);
             qemuDomainObjExitMonitor(vm);
         }
-- 
2.46.0