From: Masayoshi Mizuma <m.mizuma(a)jp.fujitsu.com&gt; QEMU_DOMAIN_DISK_PRIVATE(disk)->transientOverlayCreated flag gets true unexpectedly on qemuProcessSetupDisksTransientSnapshot() when the disk has <transient shareBacking='yes'> option. The flag should be enabled on qemuDomainAttachDiskGeneric() after the overlay setup is completed. Skip enabling transientOverlayCreated for the disk here. Fixes: 75871da0ecb8b552f9e304d0f83e216839bbf82d Signed-off-by: Masayoshi Mizuma <m.mizuma(a)jp.fujitsu.com&gt; --- src/qemu/qemu_process.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 9b069fe7ce..c37687f249 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -7039,7 +7039,8 @@ qemuProcessSetupDisksTransientSnapshot(virDomainObj *vm, for (i = 0; i < vm->def->ndisks; i++) { virDomainDiskDef *domdisk = vm->def->disks[i]; - if (!domdisk->transient) + if (!domdisk->transient || + domdisk->transientShareBacking == VIR_TRISTATE_BOOL_YES) continue; QEMU_DOMAIN_DISK_PRIVATE(domdisk)->transientOverlayCreated = true; -- 2.27.0