BUG: kernel early hang without any printk output
Command line: hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 softlockup_panic=1 nmi_watchdog=panic  prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal  root=/dev/ram0 rw link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-s1-05080402/linux-devel:devel-hourly-2014050720:89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd:bisect-linux7/.vmlinuz-89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd-20140508201820-22-f1 branch=linux-devel/devel-hourly-2014050720 BOOT_IMAGE=/kernel/x86_64-randconfig-s1-05080402/89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd/vmlinuz-3.15.0-rc4 drbd.minor_count=8
Early hang kernel: vmlinuz-3.15.0-rc4 3.15.0-rc4 #1
Elapsed time: 35
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel /kernel/x86_64-randconfig-s1-05080402/89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd/vmlinuz-3.15.0-rc4 -append 'hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 softlockup_panic=1 nmi_watchdog=panic  prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal  root=/dev/ram0 rw link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-s1-05080402/linux-devel:devel-hourly-2014050720:89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd:bisect-linux7/.vmlinuz-89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd-20140508201820-22-f1 branch=linux-devel/devel-hourly-2014050720 BOOT_IMAGE=/kernel/x86_64-randconfig-s1-05080402/89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd/vmlinuz-3.15.0-rc4 drbd.minor_count=8'  -initrd /kernel-tests/initrd/quantal-core-x86_64.cgz -m 256 -smp 48 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-quantal-f1-53 -serial file:/dev/shm/kboot/serial-quantal-f1-53 -daemonize -display none -monitor null