FYI, we noticed the following commit:

https://github.com/0day-ci/linux Michal-Hocko/fs-proc-optimize-smaps-output-formatting/20160819-181512
commit dd3b422c110260cf16491b8c5baad029c8a762c6 ("proc, meminfo: abstract show_val_kb")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 1G

caused below changes:


user  :notice: [  +6.170898] 20 Aug 04:48:28 ntpdate[337]: step time server 192.168.1.1 offset 5.245972 sec
user  :notice: [  +0.009497] /lkp/lkp/src/bin/run-lkp
user  :notice: [  +0.022923] RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-6/dd3b422c110260cf16491
b8c5baad029c8a762c6/0
user  :notice: [  +0.023769] job=/lkp/scheduled/vm-kbuild-1G-4/boot-1-debian-x86_64-2015-02-07.cgz-dd3b422c110260cf16491b8c5baad029c8a762
c6-20160820-77296-8ie4hi-0.yaml
user  :notice: [  +0.449549] run-job /lkp/scheduled/vm-kbuild-1G-4/boot-1-debian-x86_64-2015-02-07.cgz-dd3b422c110260cf16491b8c5baad029c8
a762c6-20160820-77296-8ie4hi-0.yaml
user  :err   : [  +5.618148] Signal 8 (FPE) caught by ps (procps-ng version 3.3.10).
user  :err   : [  +0.001869] ps:display.c:66: please report this bug
user  :err   : [  +0.002004] Floating point exception


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-rhel/gcc-6/dd3b422c110260cf16491b8c5baad029c8a762c6/vmlinuz-4.8.0-rc2-next-20160819-00001-gdd3b422 -append 'ip=::::vm-kbuild-1G-4::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-4/boot-1-debian-x86_64-2015-02-07.cgz-dd3b422c110260cf16491b8c5baad029c8a762c6-20160820-77296-8ie4hi-0.yaml ARCH=x86_64 kconfig=x86_64-rhel branch=linux-devel/devel-catchup-201608192016 commit=dd3b422c110260cf16491b8c5baad029c8a762c6 BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-6/dd3b422c110260cf16491b8c5baad029c8a762c6/vmlinuz-4.8.0-rc2-next-20160819-00001-gdd3b422 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-6/dd3b422c110260cf16491b8c5baad029c8a762c6/0 LKP_SERVER=inn 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 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw'  -initrd /fs/sdf1/initrd-vm-kbuild-1G-4 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23003-:22 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdf1/disk0-vm-kbuild-1G-4,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/sdf1/disk1-vm-kbuild-1G-4,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/sdf1/disk2-vm-kbuild-1G-4,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/sdf1/disk3-vm-kbuild-1G-4,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/sdf1/disk4-vm-kbuild-1G-4,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-4 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-4 -daemonize -display none -monitor null 


Thanks,
Xiaolong