FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git topic/renesas-overlays commit 03282deca12a1a3ac947445a95606af51df53a69 ("kbuild: Enable DT symbols when CONFIG_OF_OVERLAY is used") on test machine: vm-kbuild-1G: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 1G memory caused below changes: [ 9.890292] ### dt-test ### unittest_data_add: Failed to resolve phandles (rc=-22) [ 9.890292] ### dt-test ### unittest_data_add: Failed to resolve phandles (rc=-22) FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-randconfig-n0-05312127/gcc-6/03282deca12a1a3ac947445a95606af51df53a69/vmlinuz-4.7.0-rc1-00030-g03282de -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-6/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-randconfig-n0-05312127-03282deca12a1a3ac947445a95606af51df53a69-20160602-106516-uu872i-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-n0-05312127 branch=renesas-drivers/topic/renesas-overlays commit=03282deca12a1a3ac947445a95606af51df53a69 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-n0-05312127/gcc-6/03282deca12a1a3ac947445a95606af51df53a69/vmlinuz-4.7.0-rc1-00030-g03282de max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-randconfig-n0-05312127/gcc-6/03282deca12a1a3ac947445a95606af51df53a69/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-1G-6::dhcp' -initrd /fs/sdh1/initrd-vm-kbuild-1G-6 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23005-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdh1/disk0-vm-kbuild-1G-6,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdh1/disk1-vm-kbuild-1G-6,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdh1/disk2-vm-kbuild-1G-6,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdh1/disk3-vm-kbuild-1G-6,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdh1/disk4-vm-kbuild-1G-6,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-6 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-6 -daemonize -display none -monitor null Thanks, Xiaolong