FYI, we noticed the below changes on

https://github.com/0day-ci/linux Arnd-Bergmann/lz4c-shut-up-lz4c-output/20160229-204336
commit d327806d6ec53b7dfa578112dcd4874704a0d32a ("lz4c: shut up lz4c output")


+----------------------+------------+------------+
|                      | c2fd1465f3 | d327806d6e |
+----------------------+------------+------------+
| boot_successes       | 7          | 0          |
| boot_failures        | 0          | 8          |
| System_halted        | 0          | 8          |
| BUG:kernel_boot_hang | 0          | 8          |
+----------------------+------------+------------+




invalid header

 -- System halted
Elapsed time: 440
BUG: kernel boot hang
Linux version 4.5.0-rc1-00019-gd327806 #2
Command line: root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-client9-yocto-i386-1/bisect_boot-1-yocto-minimal-i386.cgz-i386-randconfig-r0-201609-d327806d6ec53b7dfa578112dcd4874704a0d32a-20160301-23742-1sncyj7-0.yaml ARCH=i386 kconfig=i386-randconfig-r0-201609 branch=linux-devel/devel-spot-201603010408 commit=d327806d6ec53b7dfa578112dcd4874704a0d32a BOOT_IMAGE=/pkg/linux/i386-randconfig-r0-201609/gcc-5/d327806d6ec53b7dfa578112dcd4874704a0d32a/vmlinuz-4.5.0-rc1-00019-gd327806 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-client9-yocto-i386/yocto-minimal-i386.cgz/i386-randconfig-r0-201609/gcc-5/d327806d6ec53b7dfa578112dcd4874704a0d32a/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-client9-yocto-i386-1::dhcp drbd.minor_count=8
qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-r0-201609/gcc-5/d327806d6ec53b7dfa578112dcd4874704a0d32a/vmlinuz-4.5.0-rc1-00019-gd327806 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-client9-yocto-i386-1/bisect_boot-1-yocto-minimal-i386.cgz-i386-randconfig-r0-201609-d327806d6ec53b7dfa578112dcd4874704a0d32a-20160301-23742-1sncyj7-0.yaml ARCH=i386 kconfig=i386-randconfig-r0-201609 branch=linux-devel/devel-spot-201603010408 commit=d327806d6ec53b7dfa578112dcd4874704a0d32a BOOT_IMAGE=/pkg/linux/i386-randconfig-r0-201609/gcc-5/d327806d6ec53b7dfa578112dcd4874704a0d32a/vmlinuz-4.5.0-rc1-00019-gd327806 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-client9-yocto-i386/yocto-minimal-i386.cgz/i386-randconfig-r0-201609/gcc-5/d327806d6ec53b7dfa578112dcd4874704a0d32a/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-client9-yocto-i386-1::dhcp drbd.minor_count=8'  -initrd /fs/sda3/initrd-vm-client9-yocto-i386-1 -m 320 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sda3/disk0-vm-client9-yocto-i386-1,media=disk,if=virtio -drive file=/fs/sda3/disk1-vm-client9-yocto-i386-1,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-client9-yocto-i386-1 -serial file:/dev/shm/kboot/serial-vm-client9-yocto-i386-1 -daemonize -display none -monitor null 





Thanks,
yexl