Hi Daniel,

FYI, we noticed the below changes on

commit 62ff94a5492175759546f8bc61383189d6b49122 ("drm/crtc-helper: remove LOCKING from kerneldoc")

testbox/testcase/testparams: snb-drag/piglit/igt-007

9fd93784f1719532  62ff94a5492175759546f8bc61  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
           :1          100%           5:5     kmsg.WARNING:at_drivers/gpu/drm/drm_crtc_helper.c:drm_helper_probe_single_connector_modes_drm_kms_helper()
           :1          100%           5:5     dmesg.WARNING:at_drivers/gpu/drm/drm_crtc_helper.c:drm_helper_probe_single_connector_modes_drm_kms_helper()
          1:5          -20%            :5     kmsg.Spurious_LAPIC_timer_interrupt_on_cpu

[   76.535023] [drm] This can cause pipe underruns and display issues.
[   76.541349] [drm] Please upgrade your BIOS to fix this.
[   76.546656] ------------[ cut here ]------------
[   76.551339] WARNING: CPU: 2 PID: 254 at drivers/gpu/drm/drm_crtc_helper.c:131 drm_helper_probe_single_connector_modes+0x371/0x3a0 [drm_kms_helper]()
[   76.566126] Modules linked in: eeepc_wmi asus_wmi snd_hda_intel(+) sparse_keymap snd_hda_codec rfkill snd_hwdep i915(+) parport_pc snd_pcm ata_piix pata_via snd_timer snd drm_kms_helper parport video tpm_infineon i2c_i801 soundcore libata pcspkr serio_raw drm wmi
[   76.591030] CPU: 2 PID: 254 Comm: modprobe Not tainted 3.14.0-g9a952a0 #1
[   76.597879] Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 1002 04/01/2011
[   76.607100]  0000000000000009 ffff8801bd4c5818 ffffffff8183d636 0000000000000000
[   76.614804]  ffff8801bd4c5850 ffffffff8106bd7d 0000000000000001 ffff8801bd312400
[   76.622520]  ffff880099d99800 ffff8801bd46ce28 ffffffffa0247a00 ffff8801bd4c5860
[   76.630237] Call Trace:
[   76.632755]  [<ffffffff8183d636>] dump_stack+0x4d/0x66
[   76.637955]  [<ffffffff8106bd7d>] warn_slowpath_common+0x7d/0xa0
[   76.644016]  [<ffffffff8106be5a>] warn_slowpath_null+0x1a/0x20
[   76.649912]  [<ffffffffa01a9341>] drm_helper_probe_single_connector_modes+0x371/0x3a0 [drm_kms_helper]
[   76.659293]  [<ffffffffa01ac030>] drm_fb_helper_probe_connector_modes+0x50/0x70 [drm_kms_helper]
[   76.668765]  [<ffffffffa01acdfd>] drm_fb_helper_initial_config+0x18d/0x4f0 [drm_kms_helper]
[   76.677208]  [<ffffffffa01f497f>] ? gen6_read32+0x6f/0x120 [i915]
[   76.683364]  [<ffffffffa01f4ca2>] ? gen6_write32+0x72/0x100 [i915]
[   76.689606]  [<ffffffffa01f4ca2>] ? gen6_write32+0x72/0x100 [i915]
[   76.695853]  [<ffffffffa021837f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[   76.703060]  [<ffffffffa0238503>] i915_driver_load+0xf03/0xf50 [i915]
[   76.709568]  [<ffffffffa002d4dd>] drm_dev_register+0xad/0x100 [drm]
[   76.715894]  [<ffffffffa003010d>] drm_get_pci_dev+0x9d/0x210 [drm]
[   76.722139]  [<ffffffffa01b77eb>] i915_pci_probe+0x3b/0x60 [i915]
[   76.728289]  [<ffffffff8141d625>] local_pci_probe+0x45/0xa0
[   76.733917]  [<ffffffff8141e815>] ? pci_match_device+0xc5/0xd0
[   76.739807]  [<ffffffff8141e931>] pci_device_probe+0xd1/0x120
[   76.745610]  [<ffffffff814eecdd>] driver_probe_device+0x8d/0x3c0
[   76.751680]  [<ffffffff814ef0db>] __driver_attach+0x8b/0x90
[   76.757316]  [<ffffffff814ef050>] ? __device_attach+0x40/0x40
[   76.761145] ata5: SATA link down (SStatus 0 SControl 310)
[   76.768581]  [<ffffffff814ecb2b>] bus_for_each_dev+0x6b/0xb0
[   76.774297]  [<ffffffff814ee73e>] driver_attach+0x1e/0x20
[   76.779753]  [<ffffffff814ee300>] bus_add_driver+0x180/0x250
[   76.785467]  [<ffffffffa0129000>] ? 0xffffffffa0128fff
[   76.790663]  [<ffffffff814ef754>] driver_register+0x64/0xf0
[   76.796292]  [<ffffffffa0129000>] ? 0xffffffffa0128fff
[   76.801489]  [<ffffffff8141cebc>] __pci_register_driver+0x4c/0x50
[   76.807638]  [<ffffffffa003039a>] drm_pci_init+0x11a/0x130 [drm]
[   76.813707]  [<ffffffffa0129000>] ? 0xffffffffa0128fff
[   76.818908]  [<ffffffffa012906a>] i915_init+0x6a/0x6c [i915]
[   76.824626]  [<ffffffff81002142>] do_one_initcall+0xd2/0x1a0
[   76.830341]  [<ffffffff8105b473>] ? set_memory_nx+0x43/0x50
[   76.835971]  [<ffffffff810eee1b>] load_module+0x133b/0x1990
[   76.841597]  [<ffffffff810ea5c0>] ? store_uevent+0x40/0x40
[   76.847140]  [<ffffffff810ef606>] SyS_finit_module+0x86/0xb0
[   76.852855]  [<ffffffff8184efe9>] system_call_fastpath+0x16/0x1b
[   76.858915] ---[ end trace decc4f53056ad5c3 ]---
[   76.897652] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 193



Thanks,
Fengguang