FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kaslr/memory commit 989b703b25e157c1ddfa61a7b697ed07d238832a ("x86/mm: Implement ASLR for kernel memory sections (x86_64)") on test machine: vm-vp-quantal-x86_64: 2 threads qemu-system-x86_64 -enable-kvm with 360M memory caused below changes: +------------------------------------------------+------------+------------+ | | 44daf23116 | 989b703b25 | +------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 8 | 6 | | IP-Config:Auto-configuration_of_network_failed | 8 | | | BUG:kernel_boot_crashed | 0 | 6 | +------------------------------------------------+------------+------------+ [ 0.330203] x86: Booting SMP configuration: [ 0.330764] .... node #0, CPUs: #1 Elapsed time: 10 BUG: kernel boot crashed qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/vmlinuz-4.7.0-rc3-00009-g989b703 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-x86_64-2/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-randconfig-s5-06141633-989b703b25e157c1ddfa61a7b697ed07d238832a-20160614-37875-2x4nlc-0.yaml~ ARCH=x86_64 kconfig=x86_64-randconfig-s5-06141633 branch=linux-devel/devel-hourly-2016061413 commit=989b703b25e157c1ddfa61a7b697ed07d238832a BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/vmlinuz-4.7.0-rc3-00009-g989b703 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/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-vp-quantal-x86_64-2::dhcp drbd.minor_count=8' -initrd /fs/sdh1/initrd-vm-vp-quantal-x86_64-2 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-x86_64-2 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-x86_64-2 -daemonize -display none -monitor null FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/vmlinuz-4.7.0-rc3-00009-g989b703 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-x86_64-2/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-randconfig-s5-06141633-989b703b25e157c1ddfa61a7b697ed07d238832a-20160614-37875-2x4nlc-0.yaml~ ARCH=x86_64 kconfig=x86_64-randconfig-s5-06141633 branch=linux-devel/devel-hourly-2016061413 commit=989b703b25e157c1ddfa61a7b697ed07d238832a BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/vmlinuz-4.7.0-rc3-00009-g989b703 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-randconfig-s5-06141633/gcc-6/989b703b25e157c1ddfa61a7b697ed07d238832a/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-vp-quantal-x86_64-2::dhcp drbd.minor_count=8' -initrd /fs/sdh1/initrd-vm-vp-quantal-x86_64-2 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-x86_64-2 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-x86_64-2 -daemonize -display none -monitor null Thanks, Kernel Test Robot