FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kaslr/memory commit 66174bd03a6386eb82f304bea95d69e777144b0b ("x86/mm: Implement ASLR for kernel memory sections (x86_64)") on test machine: vm-kbuild-yocto-ia32: 1 threads qemu-system-x86_64 -enable-kvm -cpu Westmere with 320M memory caused below changes: +----------------+------------+------------+ | | a4f6fdb166 | 66174bd03a | +----------------+------------+------------+ | boot_successes | 12 | 0 | +----------------+------------+------------+ [ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes) [ 0.000000] BUG: unable to handle kernel paging request at fffff57810000004 [ 0.000000] IP: [<ffffffffa5c93436>] reserve_bootmem_region+0x282/0x2fd [ 0.000000] PGD 0 [ 0.000000] Oops: 0000 [#1] SMP KASAN [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.7.0-rc1-00031-g66174bd #1 [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 0.000000] task: ffffffffa6611a40 ti: ffffffffa6600000 task.ti: ffffffffa6600000 [ 0.000000] RIP: 0010:[<ffffffffa5c93436>] [<ffffffffa5c93436>] reserve_bootmem_region+0x282/0x2fd [ 0.000000] RSP: 0000:ffffffffa6607d70 EFLAGS: 00010802 [ 0.000000] RAX: ffffcbc080000020 RBX: dffffc0000000000 RCX: 0000000000000000 [ 0.000000] RDX: 1ffff97810000004 RSI: 0000000000000010 RDI: ffffffffa6aeac28 [ 0.000000] RBP: ffffffffa6607dc0 R08: ffffffffa6607d38 R09: ffffffffa6d81694 [ 0.000000] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 [ 0.000000] R13: ffffcbc080000000 R14: ffffffffa6673bc0 R15: 0000000000000000 [ 0.000000] FS: 0000000000000000(0000) GS:ffff923d4bc00000(0000) knlGS:0000000000000000 [ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.000000] CR2: fffff57810000004 CR3: 000000000e20a000 CR4: 00000000000006b0 [ 0.000000] Stack: [ 0.000000] 00000000ffffffff fffffbfff4cce778 ffffffffffffffff 0000000000000010 [ 0.000000] 0000000000000000 ffffffffa6607eb8 1ffffffff4cc0fe0 ffffffffa6607df8 [ 0.000000] ffffffffa6607e78 ffffffffa6607e38 ffffffffa6607ee0 ffffffffa6d9ffc7 [ 0.000000] Call Trace: [ 0.000000] [<ffffffffa6d9ffc7>] free_all_bootmem+0xe0/0x231 [ 0.000000] [<ffffffffa6d9fee7>] ? reset_all_zones_managed_pages+0xb5/0xb5 [ 0.000000] [<ffffffffa6d6b6e8>] ? check_iommu_entries+0xd3/0x133 [ 0.000000] [<ffffffffa6d82cd5>] mem_init+0x13/0x74 [ 0.000000] [<ffffffffa6d544f4>] start_kernel+0x30a/0x701 [ 0.000000] [<ffffffffa6d541ea>] ? thread_info_cache_init+0xb/0xb [ 0.000000] [<ffffffffa6d53120>] ? early_idt_handler_array+0x120/0x120 [ 0.000000] [<ffffffffa5c977e4>] ? memblock_reserve+0x59/0x5e [ 0.000000] [<ffffffffa6d53120>] ? early_idt_handler_array+0x120/0x120 [ 0.000000] [<ffffffffa6d5329a>] x86_64_start_reservations+0x29/0x2b [ 0.000000] [<ffffffffa6d533da>] x86_64_start_kernel+0x13e/0x14d [ 0.000000] Code: 57 20 48 89 f9 48 c1 e9 03 80 3c 19 00 74 0d 48 89 55 c0 e8 ad d5 1c ff 48 8b 55 c0 49 89 57 28 49 8d 45 20 48 89 c2 48 c1 ea 03 <80> 3c 1a 00 74 10 48 89 c7 48 89 45 c0 e8 88 d5 1c ff 48 8b 45 [ 0.000000] RIP [<ffffffffa5c93436>] reserve_bootmem_region+0x282/0x2fd [ 0.000000] RSP <ffffffffa6607d70> [ 0.000000] CR2: fffff57810000004 [ 0.000000] ---[ end trace 52fd474ee1adf4a2 ]--- [ 0.000000] Kernel panic - not syncing: Fatal exception FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Westmere -kernel /pkg/linux/x86_64-randconfig-s5-06011053/gcc-6/66174bd03a6386eb82f304bea95d69e777144b0b/vmlinuz-4.7.0-rc1-00031-g66174bd -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-ia32-4/rand_boot-1-yocto-minimal-i386.cgz-x86_64-randconfig-s5-06011053-66174bd03a6386eb82f304bea95d69e777144b0b-20160601-88682-jg99rm-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s5-06011053 branch=linux-devel/devel-hourly-2016060108 commit=66174bd03a6386eb82f304bea95d69e777144b0b BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-06011053/gcc-6/66174bd03a6386eb82f304bea95d69e777144b0b/vmlinuz-4.7.0-rc1-00031-g66174bd max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-ia32/yocto-minimal-i386.cgz/x86_64-randconfig-s5-06011053/gcc-6/66174bd03a6386eb82f304bea95d69e777144b0b/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-ia32-4::dhcp drbd.minor_count=8' -initrd /fs/sdd1/initrd-vm-kbuild-yocto-ia32-4 -m 320 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdd1/disk0-vm-kbuild-yocto-ia32-4,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-ia32-4 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-ia32-4 -daemonize -display none -monitor null Thanks, Kernel Test Robot