tests: wait for udev to minize race windows

mkfs can complain about volume in use when meets udev rule processing.

diff --git a/test/shell/snapshot-merge-stack.sh b/test/shell/snapshot-merge-stack.sh
index 6eca2a06ae00a651dea3536378f9498c40a073c8..fe208655ebdc0689d9a192d1a122bfdbeff69231 100644 (file)
--- a/test/shell/snapshot-merge-stack.sh
+++ b/test/shell/snapshot-merge-stack.sh
@@ -26,6 +26,7 @@ aux prepare_vg 2 100
 snap_and_merge() {
        lvcreate -s -n $lv2 -L20 $vg/$lv1 "$dev2"
        #dd if=/dev/zero of="$DM_DEV_DIR/$vg/$lv1" bs=1M count=10 conv=fdatasync
+       aux udev_wait
        mkfs.ext3 "$DM_DEV_DIR/$vg/$lv2"
        sync
        lvs -a $vg