linux-kernel - [lkp] [drm/i915] 92826fcdfc: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

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Date:	Mon, 25 Jan 2016 10:27:36 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
CC:	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [lkp] [drm/i915] 92826fcdfc:
 [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
 underrun

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 92826fcdfc147a7d16766e987c12a9dfe1860c3f ("drm/i915: Calculate watermark related members in the crtc_state, v4.")

With your commit, there are following new message in kernel log.


<4>[   58.224586] Setting dangerous option prefault_disable - tainting kernel
<4>[   58.225430] Setting dangerous option prefault_disable - tainting kernel
<5>[   75.981870] random: nonblocking pool is initialized
<3>[   78.699663] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
<3>[   78.699692] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
<3>[   78.699711] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
<4>[   79.938904] Setting dangerous option prefault_disable - tainting kernel
<4>[   80.051631] Setting dangerous option prefault_disable - tainting kernel
<4>[   80.052652] Setting dangerous option prefault_disable - tainting kernel


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

View attachment "config-4.4.0-rc2-00283-g92826fc" of type "text/plain" (143052 bytes)

Download attachment "kmsg.xz" of type "application/x-xz" (21840 bytes)

View attachment "job.yaml" of type "text/plain" (2740 bytes)

Download attachment "reproduce.sh" of type "application/x-sh" (15362 bytes)