FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git x86/fsgs-4
commit b6cbc5aadb1703692551af7d7cacf474816879bd ("x86: Add support for rd/wr fs/gs base")


+------------------------------------------------------------------+------------+------------+
|                                                                  | 4b7e0f7003 | b6cbc5aadb |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 0          | 0          |
| boot_failures                                                    | 20         | 20         |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 17         |            |
| backtrace:platform_device_register_full                          | 7          |            |
| backtrace:alsa_card_dummy_init                                   | 7          |            |
| backtrace:kernel_init_freeable                                   | 7          |            |
| Out_of_memory:Kill_process                                       | 13         |            |
| backtrace:do_fork                                                | 9          |            |
| backtrace:SyS_clone                                              | 9          |            |
| backtrace:do_execveat_common                                     | 1          |            |
| backtrace:compat_SyS_execve                                      | 1          |            |
| backtrace:vfs_read                                               | 2          |            |
| backtrace:SyS_read                                               | 2          |            |
| backtrace:do_mount                                               | 1          |            |
| backtrace:SyS_mount                                              | 1          |            |
| backtrace:do_execve                                              | 1          |            |
| backtrace:SyS_execve                                             | 1          |            |
| BUG:kernel_boot_crashed                                          | 0          | 20         |
+------------------------------------------------------------------+------------+------------+


[    0.201850] --------------------
[    0.202838]   remote IPI:  ok  |
[    0.204005]    local IPI:
BUG: kernel boot crashed
Elapsed time: 5
qemu-system-x86_64 -enable-kvm -cpu Westmere -kernel /kernel/x86_64-allyesdebian/869901a05dfe919071ad810b2652d2566afc67a4/vmlinuz-4.0.0-rc7-wl-ath-00709-g869901a -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-ia32-30/rand_boot-1-yocto-minimal-i386.cgz-x86_64-allyesdebian-869901a05dfe919071ad810b2652d2566afc67a4-1-20150410-109122-1anpoyz.yaml ARCH=x86_64 kconfig=x86_64-allyesdebian branch=linux-devel/devel-xian-x86_64-201504101813 commit=869901a05dfe919071ad810b2652d2566afc67a4 BOOT_IMAGE=/kernel/x86_64-allyesdebian/869901a05dfe919071ad810b2652d2566afc67a4/vmlinuz-4.0.0-rc7-wl-ath-00709-g869901a RESULT_ROOT=/result/vm-kbuild-yocto-ia32/boot/1/yocto-minimal-i386.cgz/x86_64-allyesdebian/869901a05dfe919071ad810b2652d2566afc67a4/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 rd.udev.log-priority=err systemd.log_target=journal systemd.log_level=warning 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-ia32-30::dhcp drbd.minor_count=8'  -initrd /fs/sdh1/initrd-vm-kbuild-yocto-ia32-30 -m 576 -smp 1 -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-ia32-30,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-ia32-30 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-ia32-30 -daemonize -display none -monitor null 



Thanks,
Ying Huang