FYI, we noticed the following changes on: Test Machine: vm-vp-quantal-i386: 1 threads qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap with 360M memory https://github.com/0day-ci/linux Mark-Laws/Input-i8042-Fix-console-keyboard-support-on-Gen2-Hyper-V-VMs/20160418-233934 commit 3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d ("Input: i8042 - Fix console keyboard support on Gen2 Hyper-V VMs") As below, the log "i8042: Unable to get stable CTR read" showed with your commit. [ 8.267175] Silicon Labs C2 port support v. 0.51.0 - (C) 2007 Rodolfo Giometti [ 8.268891] L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue [ 8.269972] platform physmap-flash.0: failed to claim resource 0 [ 8.271055] HSI/SSI char device loaded [ 8.272373] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 [ 8.274135] i8042: Unable to get stable CTR read [ 8.274832] i8042: probe of i8042 failed with error -5 [ 8.276130] mousedev: PS/2 mouse device common for all mice [ 8.278051] rtc rtc0: alarm rollover: day [ 8.278637] rtc rtc0: invalid alarm value: 1900-1-19 0:0:0 [ 8.279527] rtc rtc0: test: dev (253:0) [ 8.280081] rtc-test rtc-test.0: rtc core: registered test as rtc0 [ 8.281062] rtc rtc1: alarm rollover: day [ 8.281607] rtc rtc1: invalid alarm value: 1900-1-19 0:0:0 [ 8.282460] rtc rtc1: test: dev (253:1) [ 8.283028] rtc-test rtc-test.1: rtc core: registered test as rtc1 FYI, raw QEMU command line is: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/i386-randconfig-r0-201616/gcc-5/3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d/vmlinuz-4.5.0-00061-g3bef6a7 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-i386-14/bisect_boot-1-quantal-core-i386.cgz-i386-randconfig-r0-201616-3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d-20160419-97230-vst2ul-1.yaml ARCH=i386 kconfig=i386-randconfig-r0-201616 branch=linux-devel/devel-catchup-201604190000 commit=3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d BOOT_IMAGE=/pkg/linux/i386-randconfig-r0-201616/gcc-5/3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d/vmlinuz-4.5.0-00061-g3bef6a7 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-i386/quantal-core-i386.cgz/i386-randconfig-r0-201616/gcc-5/3bef6a77abdb473e3201a4ade1c02bb5d7c8b29d/1 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-vp-quantal-i386-14::dhcp drbd.minor_count=8' -initrd /fs/sde1/initrd-vm-vp-quantal-i386-14 -m 360 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-i386-14 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-i386-14 -daemonize -display none -monitor null Thanks, Xiaolong Ye