FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit f5f3497cad8c8416a74b9aaceb127908755d020a ("x86/setup: Extend low identity map to cover whole kernel range")


+------------------------------------------------+------------+------------+
|                                                | 8a53554e12 | f5f3497cad |
+------------------------------------------------+------------+------------+
| boot_successes                                 | 19         | 10         |
| boot_failures                                  | 2          | 9          |
| IP-Config:Auto-configuration_of_network_failed | 2          | 2          |
| BUG:kernel_boot_crashed                        | 0          | 7          |
+------------------------------------------------+------------+------------+


[    0.053410] smpboot: CPU0: GenuineIntel GenuineIntel QEMU Virtual CPU version 2.4.0QEMU Virtual CPU version 2.4.0 (family: 0x6, model: 0x6 (family: 0x6, model: 0x6, stepping: 0x3)
, stepping: 0x3)
[    0.056666] Performance Events: 
[    0.056666] Performance Events: no PMU driver, software events only.
no PMU driver, software events only.
[    0.060520] CPU 1 irqstacks, hard=8a832000 soft=8a834000
[    0.060520] CPU 1 irqstacks, hard=8a832000 soft=8a834000
[    0.061605] x86: Booting SMP configuration:
[    0.061605] x86: Booting SMP configuration:
[    0.062445] .... node  #0, CPUs:  
[    0.062445] .... node  #0, CPUs:         #1 #1
Elapsed time: 10
BUG: kernel boot crashed
qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-i1-201543/gcc-4.9/f5f3497cad8c8416a74b9aaceb127908755d020a/vmlinuz-4.3.0-rc5-00039-gf5f3497 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-i386-64/bisect_boot-1-yocto-minimal-i386.cgz-i386-randconfig-i1-201543-f5f3497cad8c8416a74b9aaceb127908755d020a-20151028-63408-uxh2ow-0.yaml ARCH=i386 kconfig=i386-randconfig-i1-201543 branch=linus/master commit=f5f3497cad8c8416a74b9aaceb127908755d020a BOOT_IMAGE=/pkg/linux/i386-randconfig-i1-201543/gcc-4.9/f5f3497cad8c8416a74b9aaceb127908755d020a/vmlinuz-4.3.0-rc5-00039-gf5f3497 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-i386/yocto-minimal-i386.cgz/i386-randconfig-i1-201543/gcc-4.9/f5f3497cad8c8416a74b9aaceb127908755d020a/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-kbuild-yocto-i386-64::dhcp drbd.minor_count=8'  -initrd /fs/sdh1/initrd-vm-kbuild-yocto-i386-64 -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/sdh1/disk0-vm-kbuild-yocto-i386-64,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-i386-64 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-i386-64 -daemonize -display none -monitor null 





Thanks,
Ying Huang