FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/gcc-plugins commit 26627f05b7df43dfd0586ddb5fe568463658c5da ("Add sancov plugin") [ 0.000000] DMA zone: 3998 pages, LIFO batch:0 [ 0.000000] DMA32 zone: 3528 pages used for memmap [ 0.000000] DMA32 zone: 258016 pages, LIFO batch:31 [ 0.000000] BUG: unable to handle kernel NULL pointer dereference at (null) [ 0.000000] IP: [] native_set_pgd+0x22/0x30 [ 0.000000] PGD 0 [ 0.000000] Oops: 0002 [#1] PREEMPT SMP KASAN [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.6.0-rc3-00023-g26627f05 #1 [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 0.000000] task: ffffffffa6217e80 ti: ffffffffa6200000 task.ti: ffffffffa6200000 [ 0.000000] RIP: 0010:[] [] native_set_pgd+0x22/0x30 [ 0.000000] RSP: 0000:ffffffffa6207d30 EFLAGS: 00010097 [ 0.000000] RAX: ffffffffa6217e80 RBX: 0000000000000000 RCX: ffffffffa4896452 [ 0.000000] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 0.000000] RBP: ffffffffa6207d40 R08: 0000000000000000 R09: 0000000000000000 [ 0.000000] R10: 0000000000000000 R11: 000000002620b067 R12: 0000000000000000 [ 0.000000] R13: fffffc0000000000 R14: 0000008000000000 R15: ffffffffa715a660 [ 0.000000] FS: 0000000000000000(0000) GS:ffffffffa6fef000(0000) knlGS:0000000000000000 [ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.000000] CR2: 0000000000000000 CR3: 0000000027093000 CR4: 00000000000406b0 [ 0.000000] Stack: [ 0.000000] ffffec0000000000 0000000000000000 ffffffffa6207d78 ffffffffa703c97f [ 0.000000] ffffffffa6207ec8 ffffffffa6207e08 000000003ff7ec00 ffffffffa6207dc8 [ 0.000000] ffffffffa715a660 ffffffffa6207ef0 ffffffffa701b3c0 0000000000000006 [ 0.000000] Call Trace: [ 0.000000] [] kasan_init+0xf1/0x3b0 [ 0.000000] [] setup_arch+0x1491/0x168b [ 0.000000] [] ? reserve_standard_io_resources+0x50/0x50 [ 0.000000] [] ? vprintk_default+0x30/0x40 [ 0.000000] [] ? printk+0xb6/0xdd [ 0.000000] [] ? kzalloc+0x2b/0x2b [ 0.000000] [] ? __asan_store8+0x4e/0x140 [ 0.000000] [] ? __asan_load1+0x4b/0xe0 [ 0.000000] [] ? check_preemption_disabled+0x43/0x1d0 [ 0.000000] [] start_kernel+0xd3/0x7e0 [ 0.000000] [] ? thread_info_cache_init+0x12/0x12 [ 0.000000] [] ? memblock_reserve+0x7c/0x8f [ 0.000000] [] ? early_idt_handler_array+0x120/0x120 [ 0.000000] [] x86_64_start_reservations+0x59/0x63 [ 0.000000] [] x86_64_start_kernel+0x16f/0x183 [ 0.000000] Code: 5c 5d c3 66 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb 49 89 f4 e8 ce 69 16 00 48 89 df 48 83 05 73 39 92 02 01 e8 7e 6e 24 00 <4c> 89 23 5b 41 5c 5d c3 66 0f 1f 44 00 00 55 48 89 e5 41 54 53 [ 0.000000] RIP [] native_set_pgd+0x22/0x30 [ 0.000000] RSP [ 0.000000] CR2: 0000000000000000 [ 0.000000] ---[ end trace f1542b5b1e40bd14 ]--- [ 0.000000] Kernel panic - not syncing: Fatal exception FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-randconfig-s4-04130305/gcc-5/26627f05b7df43dfd0586ddb5fe568463658c5da/vmlinuz-4.6.0-rc3-00023-g26627f05 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-3/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-randconfig-s4-04130305-26627f05b7df43dfd0586ddb5fe568463658c5da-20160413-41841-dknpvw-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s4-04130305 branch=linux-devel/devel-catchup-201604130329 commit=26627f05b7df43dfd0586ddb5fe568463658c5da BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s4-04130305/gcc-5/26627f05b7df43dfd0586ddb5fe568463658c5da/vmlinuz-4.6.0-rc3-00023-g26627f05 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-randconfig-s4-04130305/gcc-5/26627f05b7df43dfd0586ddb5fe568463658c5da/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-1G-3::dhcp' -initrd /fs/sdd1/initrd-vm-kbuild-1G-3 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23002-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdd1/disk0-vm-kbuild-1G-3,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdd1/disk1-vm-kbuild-1G-3,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdd1/disk2-vm-kbuild-1G-3,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdd1/disk3-vm-kbuild-1G-3,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdd1/disk4-vm-kbuild-1G-3,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-3 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-3 -daemonize -display none -monitor null Thanks, Kernel Test Robot