[lkp] [drm/i915] 3a03dfb057: [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring

[lkp] [drm/i915] 3a03dfb057: [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring

[kernel test robot]

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FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 3a03dfb057d0ee5f3146ffe40179af3ed7e48213 ("drm/i915: Calculate vblank timestamping constants before enabling vblank.")

[   29.944531] [drm] Driver supports precise vblank timestamp query.
[   29.954553] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   29.986458] [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!
[   31.008632] [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring
[   32.022144] [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring
[   32.031521] [drm:init_ring_common [i915]] *ERROR* failed to set render ring head to zero ctl 0001f001 head 00000064 tail 000000c0 start 00012000
[   32.047317] [drm:i915_gem_init [i915]] *ERROR* Failed to initialize GPU, declaring it wedged
[   32.059922] fbcon: inteldrmfb (fb0) is primary device
[   32.066662] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[   32.067027] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6

To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml


Thanks,
Ying Huang

[-- Attachment #2: kmsg.xz --]
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[-- Attachment #3: job.yaml --]
[-- Type: application/octet-stream, Size: 3294 bytes --]

---
LKP_SERVER: inn
LKP_CGI_PORT: 80
LKP_CIFS_PORT: 139
testcase: will-it-scale
default-monitors:
  wait: activate-monitor
  kmsg: 
  uptime: 
  iostat: 
  vmstat: 
  numa-numastat: 
  numa-vmstat: 
  numa-meminfo: 
  proc-vmstat: 
  proc-stat:
    interval: 10
  meminfo: 
  slabinfo: 
  interrupts: 
  lock_stat: 
  latency_stats: 
  softirqs: 
  bdi_dev_mapping: 
  diskstats: 
  nfsstat: 
  cpuidle: 
  cpufreq-stats: 
  turbostat: 
  pmeter: 
  sched_debug:
    interval: 60
cpufreq_governor: performance
default-watchdogs:
  oom-killer: 
  watchdog: 
commit: ed0f2387a5d871b4cbca764dad6d22e6e4752a7f
model: Broadwell ULT
nr_cpu: 4
memory: 4G
nr_ssd_partitions: 1
ssd_partitions: "/dev/disk/by-id/ata-INTEL_SSDSC2CW120A3_CVCV252505YF120BGN-part1"
rootfs_partition: "/dev/disk/by-id/ata-INTEL_SSDSC2CW120A3_CVCV252505YF120BGN-part2"
category: benchmark
perf-profile:
  freq: 800
will-it-scale:
  test: eventfd1
queue: cyclic
testbox: lkp-bdw03
tbox_group: lkp-bdw03
kconfig: x86_64-rhel
enqueue_time: 2015-07-22 11:48:23.265235898 +08:00
user: lkp
compiler: gcc-4.9
head_commit: ed0f2387a5d871b4cbca764dad6d22e6e4752a7f
base_commit: cbfe8fa6cd672011c755c3cd85c9ffd4e2d10a6f
branch: linux-devel/devel-hourly-2015073008
kernel: "/pkg/linux/x86_64-rhel/gcc-4.9/ed0f2387a5d871b4cbca764dad6d22e6e4752a7f/vmlinuz-4.2.0-rc4-02295-ged0f238"
rootfs: debian-x86_64-2015-02-07.cgz
result_root: "/result/will-it-scale/performance-eventfd1/lkp-bdw03/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/ed0f2387a5d871b4cbca764dad6d22e6e4752a7f/0"
job_file: "/lkp/scheduled/lkp-bdw03/cyclic_will-it-scale-performance-eventfd1-x86_64-rhel-CYCLIC_HEAD-ed0f2387a5d871b4cbca764dad6d22e6e4752a7f-20150722-48323-18912gm-0.yaml"
dequeue_time: 2015-07-31 16:45:32.431700690 +08:00
max_uptime: 1500
initrd: "/osimage/debian/debian-x86_64-2015-02-07.cgz"
bootloader_append:
- root=/dev/ram0
- user=lkp
- job=/lkp/scheduled/lkp-bdw03/cyclic_will-it-scale-performance-eventfd1-x86_64-rhel-CYCLIC_HEAD-ed0f2387a5d871b4cbca764dad6d22e6e4752a7f-20150722-48323-18912gm-0.yaml
- ARCH=x86_64
- kconfig=x86_64-rhel
- branch=linux-devel/devel-hourly-2015073008
- commit=ed0f2387a5d871b4cbca764dad6d22e6e4752a7f
- BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-4.9/ed0f2387a5d871b4cbca764dad6d22e6e4752a7f/vmlinuz-4.2.0-rc4-02295-ged0f238
- max_uptime=1500
- RESULT_ROOT=/result/will-it-scale/performance-eventfd1/lkp-bdw03/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/ed0f2387a5d871b4cbca764dad6d22e6e4752a7f/0
- LKP_SERVER=inn
- |2-


  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
lkp_initrd: "/lkp/lkp/lkp-x86_64.cgz"
modules_initrd: "/pkg/linux/x86_64-rhel/gcc-4.9/ed0f2387a5d871b4cbca764dad6d22e6e4752a7f/modules.cgz"
bm_initrd: "/osimage/deps/debian-x86_64-2015-02-07.cgz/lkp.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/run-ipconfig.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/turbostat.cgz,/lkp/benchmarks/turbostat.cgz,/lkp/benchmarks/will-it-scale.cgz"
job_state: finished
loadavg: 4.57 2.66 1.14 1/96 4630
start_time: '1438332734'
end_time: '1438333038'
version: "/lkp/lkp/.src-20150731-141803"

[-- Attachment #4: reproduce --]
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echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
./runtest.py eventfd1 32 both 1 2 3 4