FYI, we noticed the below changes on
https://github.com/0day-ci/linux Jan-Kara/printk-Make-printk-completely-async/20160303-000904
commit 35e4e3140fa952a074470ac4f06466c8b2f112c4 ("printk: Make printk() completely async")
[ 121.124939] Unregister pv shared memory for cpu 0
Elapsed time: 130
BUG: kernel boot crashed
qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-allyesdebian/gcc-5/35e4e3140fa952a074470ac4f06466c8b2f112c4/vmlinuz-4.5.0-rc6-00001-g35e4e31 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-client5-openwrt-ia32-12/bisect_boot-1-openwrt-i386.cgz-x86_64-allyesdebian-35e4e3140fa952a074470ac4f06466c8b2f112c4-20160303-26811-2ks6d5-2.yaml ARCH=x86_64 kconfig=x86_64-allyesdebian branch=linux-devel/devel-catchup-201603030044 commit=35e4e3140fa952a074470ac4f06466c8b2f112c4 BOOT_IMAGE=/pkg/linux/x86_64-allyesdebian/gcc-5/35e4e3140fa952a074470ac4f06466c8b2f112c4/vmlinuz-4.5.0-rc6-00001-g35e4e31 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-client5-openwrt-ia32/openwrt-i386.cgz/x86_64-allyesdebian/gcc-5/35e4e3140fa952a074470ac4f06466c8b2f112c4/0 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-client5-openwrt-ia32-12::dhcp drbd.minor_count=8' -initrd /fs/sda2/initrd-vm-client5-openwrt-ia32-12 -m 704 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sda2/disk0-vm-client5-openwrt-ia32-12,media=disk,if=virtio -drive file=/fs/sda2/disk1-vm-client5-openwrt-ia32-12,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-client5-openwrt-ia32-12 -serial file:/dev/shm/kboot/serial-vm-client5-openwrt-ia32-12 -daemonize -display none -monitor null
Thanks,
Kernel Test Robot