From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shuah Khan Subject: intel_check_page_flip() - WARN_ON(!in_interrupt()) Date: Thu, 28 May 2015 17:44:33 -0600 Message-ID: <5567A861.8080101@osg.samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: daniel.vetter@intel.com, jani.nikula@linux.intel.com Cc: "linux-kernel@vger.kernel.org" , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org I am seeing the following in the dmesg on 4.0.4 with rt patch [ 5.720319] ------------[ cut here ]------------ [ 5.720347] WARNING: CPU: 6 PID: 466 at drivers/gpu/drm/i915/intel_display.c:9748 intel_check_page_flip+0xaa/0xf0 [i915]() [ 5.720349] WARN_ON(!in_interrupt()) [ 5.720350] Modules linked in: [ 5.720376] binfmt_misc rfcomm bnep arc4 eeepc_wmi hid_generic asus_wmi sparse_keymap iwlmvm intel_powerclamp coretemp kvm_intel kvm mac80211 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul dm_multipath glue_helper snd_hda_codec_hdmi scsi_dh ablk_helper cryptd microcode btusb iwlwifi bluetooth serio_raw cfg80211 i915 snd_hda_codec_realtek snd_hda_codec_generic lpc_ich snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi drm_kms_helper snd_seq drm video snd_seq_device mac_hid snd_timer snd mei_me wmi mei shpchp soundcore i2c_algo_bit usbhid hid parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq psmouse dm_mirror r8169 ahci dm_region_hash libahci mii dm_log [ 5.720379] CPU: 6 PID: 466 Comm: irq/32-i915 Not tainted 4.0.4-rt1+ #8 [ 5.720380] Hardware name: System76, Inc. Wild Dog Performance/H87-PLUS, BIOS 0705 12/05/2013 [ 5.720382] 0000000000000009 ffff8803ea39bc98 ffffffff817c0694 0000000000000002 [ 5.720383] ffff8803ea39bce8 ffff8803ea39bcd8 ffffffff81073d8a 0000000000000001 [ 5.720384] ffff8803eb184000 ffff8800d7804800 0000000000000000 0000000000000000 [ 5.720385] Call Trace: [ 5.720390] [] dump_stack+0x4f/0x90 [ 5.720393] [] warn_slowpath_common+0x8a/0xe0 [ 5.720395] [] warn_slowpath_fmt+0x46/0x50 [ 5.720410] [] intel_check_page_flip+0xaa/0xf0 [i915] [ 5.720420] [] ironlake_irq_handler+0x2e8/0x1000 [i915] [ 5.720423] [] ? debug_smp_processor_id+0x17/0x20 [ 5.720424] [] ? pin_current_cpu+0x92/0x1d0 [ 5.720426] [] ? irq_thread_fn+0x50/0x50 [ 5.720428] [] irq_forced_thread_fn+0x27/0x80 [ 5.720429] [] irq_thread+0x10f/0x160 [ 5.720430] [] ? wake_threads_waitq+0x30/0x30 [ 5.720432] [] ? irq_thread_check_affinity+0x90/0x90 [ 5.720433] [] kthread+0xbb/0xe0 [ 5.720434] [] ? kthread_worker_fn+0x1a0/0x1a0 [ 5.720436] [] ret_from_fork+0x58/0x90 [ 5.720437] [] ? kthread_worker_fn+0x1a0/0x1a0 [ 5.720437] ---[ end trace 0000000000000002 ]--- There seem to be few past bug reports on this issue. Has this been fixed? Should I be concerned about this? thanks, -- Shuah -- Shuah Khan Sr. Linux Kernel Developer Open Source Innovation Group Samsung Research America (Silicon Valley) shuahkh@osg.samsung.com | (970) 217-8978