drm/i915/intel_drv.h - RPM wakelock ref not held during HW access

Andrea Gelmini andrea.gelmini at gelma.net
Tue Jan 5 07:03:38 PST 2016 

Hi everybody,
   on my laptop I'm using 4.4.0-rc8 + drm-intel-nightly from git://anongit.freedesktop.org/drm-intel
   (commit 0417da5e6f56078d87d366d5f959f8290ae9d16d).

   Found this after few hours (dunno if it's a false positive, something to ignore or not):

[Tue Jan  5 15:15:44 2016] ------------[ cut here ]------------
[Tue Jan  5 15:15:44 2016] WARNING: CPU: 2 PID: 38 at drivers/gpu/drm/i915/intel_drv.h:1457 gen6_ggtt_clear_range+0x2fb/0x460 [i915]()
[Tue Jan  5 15:15:44 2016] RPM wakelock ref not held during HW access
[Tue Jan  5 15:15:44 2016] Modules linked in:
[Tue Jan  5 15:15:44 2016]  xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables x_tables nf_nat nf_conntrack br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio loop binfmt_misc snd_hrtimer snd_hda_codec_hdmi uvcvideo intel_rapl iosf_mbi videobuf2_vmalloc videobuf2_memops x86_pkg_temp_thermal intel_powerclamp videobuf2_v4l2 videobuf2_core coretemp v4l2_common arc4 videodev cdc_mbim iwldvm cdc_ncm media usbnet mac80211 mii cdc_wdm input_leds cdc_acm joydev snd_hda_codec_realtek snd_hda_codec_generic serio_raw snd_hda_intel iwlwifi snd_hda_codec thinkpad_acpi sg snd_hda_core nvram cfg80211 snd_seq_midi snd_hwdep snd_seq_midi_event lpc_ich snd_pcm snd_rawmidi snd_seq snd_seq_device snd_timer
[Tue Jan  5 15:15:44 2016]  snd soundcore tpm_tis tpm kvm_intel kvm irqbypass sunrpc autofs4 algif_skcipher af_alg sr_mod sd_mod cdrom i915 crct10dif_pclmul crc32_pclmul i2c_algo_bit drm_kms_helper syscopyarea sysfillrect jitterentropy_rng sysimgblt drbg fb_sys_fops ansi_cprng drm aesni_intel sdhci_pci aes_x86_64 e1000e lrw sdhci gf128mul glue_helper ablk_helper psmouse ahci intel_gtt cryptd mmc_core ptp libahci agpgart pps_core i2c_core wmi fjes video
[Tue Jan  5 15:15:44 2016] CPU: 2 PID: 38 Comm: kswapd0 Not tainted 4.4.0-rc8-KASan-01354-g3041cce #6
[Tue Jan  5 15:15:44 2016] Hardware name: LENOVO 2356LRG/2356LRG, BIOS G7ETA4WW (2.64 ) 10/08/2015
[Tue Jan  5 15:15:44 2016]  ffffffffc08a7320 ffff88035f9e7558 ffffffff86a2adea ffff88035f9e75c8
[Tue Jan  5 15:15:44 2016]  ffff88035f9e7598 ffffffff8610bccc ffffffffc06a9b2b ffffed006bf3ceb5
[Tue Jan  5 15:15:44 2016]  ffffc900011f9084 ffff88035e6b0000 ffff88035e6b9cd8 0000000000000002
[Tue Jan  5 15:15:44 2016] Call Trace:
[Tue Jan  5 15:15:44 2016]  [<ffffffff86a2adea>] dump_stack+0x4e/0x84
[Tue Jan  5 15:15:44 2016]  [<ffffffff8610bccc>] warn_slowpath_common+0xbc/0x120
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06a9b2b>] ? gen6_ggtt_clear_range+0x2fb/0x460 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffff8610bdbf>] warn_slowpath_fmt+0x8f/0xb0
[Tue Jan  5 15:15:44 2016]  [<ffffffff8610bd30>] ? warn_slowpath_common+0x120/0x120
[Tue Jan  5 15:15:44 2016]  [<ffffffff8642821c>] ? kfree+0x19c/0x1b0
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06a9b2b>] gen6_ggtt_clear_range+0x2fb/0x460 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06a410a>] ggtt_unbind_vma+0x24a/0x2e0 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06a1de2>] ? i915_gem_object_put_fence+0x62/0x270 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06ca49b>] __i915_vma_unbind+0x1fb/0x980 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06cac2e>] i915_vma_unbind+0xe/0x10 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06d7bce>] i915_gem_shrink+0x3ae/0x790 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06d7820>] ? i915_gem_shrinker_count+0x6c0/0x6c0 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffff86aa2e43>] ? __this_cpu_preempt_check+0x13/0x20
[Tue Jan  5 15:15:44 2016]  [<ffffffff861ddbac>] ? trace_hardirqs_on_caller+0x28c/0x5e0
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06d811a>] i915_gem_shrinker_scan+0x16a/0x1c0 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffffc06d7fb0>] ? i915_gem_shrink+0x790/0x790 [i915]
[Tue Jan  5 15:15:44 2016]  [<ffffffff863b5001>] ? __list_lru_count_one.isra.0+0xd1/0x140
[Tue Jan  5 15:15:44 2016]  [<ffffffff86471352>] ? super_cache_count+0x142/0x260
[Tue Jan  5 15:15:44 2016]  [<ffffffff87585d4c>] ? _raw_spin_unlock+0x2c/0x50
[Tue Jan  5 15:15:44 2016]  [<ffffffff86380522>] shrink_slab.part.7+0x2f2/0x530
[Tue Jan  5 15:15:44 2016]  [<ffffffff86380230>] ? inactive_anon_is_low+0x1e0/0x1e0
[Tue Jan  5 15:15:44 2016]  [<ffffffff86388610>] shrink_zone+0x7a0/0xae0
[Tue Jan  5 15:15:44 2016]  [<ffffffff87585e58>] ? _raw_spin_unlock_irq+0x38/0x50
[Tue Jan  5 15:15:44 2016]  [<ffffffff86387e70>] ? shrink_lruvec+0xf20/0xf20
[Tue Jan  5 15:15:44 2016]  [<ffffffff8635ea51>] ? zone_watermark_ok_safe+0x1c1/0x280
[Tue Jan  5 15:15:44 2016]  [<ffffffff8638a85d>] kswapd+0x9ad/0x1110
[Tue Jan  5 15:15:44 2016]  [<ffffffff86389eb0>] ? mem_cgroup_shrink_node_zone+0x290/0x290
[Tue Jan  5 15:15:44 2016]  [<ffffffff86aa2e43>] ? __this_cpu_preempt_check+0x13/0x20
[Tue Jan  5 15:15:44 2016]  [<ffffffff87585e58>] ? _raw_spin_unlock_irq+0x38/0x50
[Tue Jan  5 15:15:44 2016]  [<ffffffff861c9390>] ? wake_atomic_t_function+0x270/0x270
[Tue Jan  5 15:15:44 2016]  [<ffffffff86389eb0>] ? mem_cgroup_shrink_node_zone+0x290/0x290
[Tue Jan  5 15:15:44 2016]  [<ffffffff8615f3b8>] kthread+0x218/0x2e0
[Tue Jan  5 15:15:44 2016]  [<ffffffff8615f1a0>] ? kthread_create_on_node+0x460/0x460
[Tue Jan  5 15:15:44 2016]  [<ffffffff8615f1a0>] ? kthread_create_on_node+0x460/0x460
[Tue Jan  5 15:15:44 2016]  [<ffffffff87586c2f>] ret_from_fork+0x3f/0x70
[Tue Jan  5 15:15:44 2016]  [<ffffffff8615f1a0>] ? kthread_create_on_node+0x460/0x460
[Tue Jan  5 15:15:44 2016] ---[ end trace 074b4bd8168aac27 ]---

   In attachment all the hardware details. Also you can find compiled kernel here:
   http://mail.gelma.net/i915

Thanks a lot for your work,
Andrea
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