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/i386-randconfig-c1-06230242/linux-devel:devel-hourly-2014062302:a920677c35627d1baac9776dfba0286e7a1e1f0f:bisect-linux4/.vmlinuz-a920677c35627d1baac9776dfba0286e7a1e1f0f-20140623053514-40-ivb42 branch=linux-devel/devel-hourly-2014062302 BOOT_IMAGE=/kernel/i386-randconfig-c1-06230242/a920677c35627d1baac9776dfba0286e7a1e1f0f/vmlinuz-3.16.0-rc1-00017-ga920677 drbd.minor_count=8
Early hang kernel: vmlinuz-3.16.0-rc1-00017-ga920677 3.16.0-rc1-00017-ga920677 #6
Elapsed time: 35
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel /kernel/i386-randconfig-c1-06230242/a920677c35627d1baac9776dfba0286e7a1e1f0f/vmlinuz-3.16.0-rc1-00017-ga920677 -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/i386-randconfig-c1-06230242/linux-devel:devel-hourly-2014062302:a920677c35627d1baac9776dfba0286e7a1e1f0f:bisect-linux4/.vmlinuz-a920677c35627d1baac9776dfba0286e7a1e1f0f-20140623053514-40-ivb42 branch=linux-devel/devel-hourly-2014062302 BOOT_IMAGE=/kernel/i386-randconfig-c1-06230242/a920677c35627d1baac9776dfba0286e7a1e1f0f/vmlinuz-3.16.0-rc1-00017-ga920677 drbd.minor_count=8'  -initrd /kernel-tests/initrd/quantal-core-i386.cgz -m 320 -smp 2 -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-ivb42-110 -serial file:/dev/shm/kboot/serial-quantal-ivb42-110 -daemonize -display none -monitor null