It's a bug in sanity test. I can look into the bug and send out a patch for
such condition checking.

Hi Richard,
I would like to add following check in sanity test to prevent such issue. Could you help to review?

diff --git a/scripts/qemuimage-testlib b/scripts/qemuimage-testlib
index c2c394d..2325237 100644
--- a/scripts/qemuimage-testlib
+++ b/scripts/qemuimage-testlib
@@ -365,8 +365,21 @@ Test_Create_Qemu()
        elif [ "$QEMUARCH" = "qemumips" ]; then
                KERNEL=$(Test_Find_Image -l ${DEPLOY_DIR}/images -k vmlinux -a ${QEMUARCH})
        fi
+
+       # If there is kernel image found, return failed directly
+       if [ $? -eq 1 ]; then
+               Test_Info "No kernel image file found under ${DEPLOY_DIR}/images for ${QEMUARCH}, pls. have a check"
+               return $ret
+       fi

        ROOTFS_IMAGE=$(Test_Find_Image -l ${DEPLOY_DIR}/images -t ${QEMUTARGET} -a ${QEMUARCH})
+
+       # If there is rootfs image found, return failed directly
+       if [ $? -eq 1 ]; then
+               Test_Info "No ${QEMUTARGET} rootfs image file found under ${DEPLOY_DIR}/images for ${QEMUARCH}, pls. have a check"
+               return $ret
+       fi
+
        TEST_ROOTFS_IMAGE="${TEST_TMP}/${QEMUTARGET}-${QEMUARCH}-test.ext3"

        CP=`which cp`
@@ -375,6 +388,11 @@ Test_Create_Qemu()
        fi
        $CP $ROOTFS_IMAGE $TEST_ROOTFS_IMAGE

+       if [ $? -ne 0 ]; then
+               Test_Info "Image ${ROOTFS_IMAGE} copy to ${TEST_ROOTFS_IMAGE} failed, return fail"
+               return $ret
+       fi
+
        export MACHINE=$QEMUARCH

        # Create Qemu in localhost VNC Port 1
@@ -402,6 +420,11 @@ Test_Create_Qemu()
        if [ ${up_time} -lt ${timeout} ]; then
                sleep 5
                TARGET_IPADDR=`Test_Fetch_Target_IP $PID`
+               # If IP address is 0, means there is no qemu process found
+               if [ ${TARGET_IPADDR} -eq 0 ]; then
+                       Test_Info "There is no qemu process or qemu ip address found, return failed"
+                       return $ret
+               fi
        fi

I've checked and the "If IP address is 0, means there is no qemu process found" test does ensure the problem I saw doesn't happen. Please send this patch as is a definite improvement on the existing code, thanks.

Fixing patch in master now, commit 236faced1d907b025a3136c5949a311104d3a661.