[Bug 91960] [i915] kernel warning hsw_unclaimed_reg_debug intel_uncore.c:619

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91960

--- Comment #7 from Renan Birck <renan.ee.ufsm at gmail.com> ---
Ubuntu 16.04 mainline kernel, ASUS Z450LA laptop, has a similar error:

Ago 23 11:33:48 alpha kernel: ------------[ cut here ]------------
Ago 23 11:33:48 alpha kernel: WARNING: CPU: 2 PID: 3045 at
/mnt/disk2/xenial/drivers/gpu/drm/i915/intel_uncore.c:619
hsw_unclaimed_reg_debug+0x69/0x90 [i915]()
Ago 23 11:33:48 alpha kernel: Unclaimed register detected before reading
register 0x22384
Ago 23 11:33:48 alpha kernel: Modules linked in: rfcomm msr pci_stub
vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep binfmt_misc
nls_iso8859_1 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2
videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel intel_rapl
bluetooth x86_pkg_temp_thermal arc4 intel_powerclamp coretemp
snd_hda_codec_hdmi kvm_intel kvm rtl8723be(OE) btcoexist(OE) irqbypass
rtl_pci(OE) snd_hda_codec_realtek crct10dif_pclmul rtlwifi(OE) crc32_pclmul
mac80211 snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core
asus_nb_wmi asus_wmi snd_hwdep snd_pcm sparse_keymap aesni_intel cfg80211
snd_seq_midi snd_seq_midi_event aes_x86_64 lrw snd_rawmidi rtsx_pci_ms snd_seq
gf128mul glue_helper memstick ablk_helper cryptd snd_seq_device input_leds
joydev serio_raw snd_timer
Ago 23 11:33:48 alpha kernel:  dw_dmac snd dw_dmac_core soundcore mac_hid
mei_me int3402_thermal shpchp 8250_dw snd_soc_sst_acpi mei int3400_thermal
processor_thermal_device spi_pxa2xx_platform acpi_thermal_rel
int340x_thermal_zone intel_soc_dts_iosf intel_pch_thermal lpc_ich
i2c_designware_platform tpm_crb i2c_designware_core acpi_pad parport_pc ppdev
lp parport autofs4 hid_generic usbhid hid uas usb_storage rtsx_pci_sdmmc i915
psmouse i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt r8169
ahci fb_sys_fops mii libahci drm rtsx_pci wmi sdhci_acpi video sdhci fjes
Ago 23 11:33:48 alpha kernel: CPU: 2 PID: 3045 Comm: Xorg Tainted: G          
OE   4.4.0-34-generic #53
Ago 23 11:33:48 alpha kernel: Hardware name: ASUSTeK COMPUTER INC.
Z450LA/Z450LA, BIOS Z450LA.204 08/12/2015
Ago 23 11:33:48 alpha kernel:  0000000000000086 00000000f47942d3
ffff88024ed03cd8 ffffffff813f11b3
Ago 23 11:33:48 alpha kernel:  ffff88024ed03d20 ffffffffc025fde0
ffff88024ed03d10 ffffffff81081102
Ago 23 11:33:48 alpha kernel:  ffff880035ac0000 0000000000022384
ffff880035ac4568 0000000000022384
Ago 23 11:33:48 alpha kernel: Call Trace:
Ago 23 11:33:48 alpha kernel:  <IRQ>  [<ffffffff813f11b3>] dump_stack+0x63/0x90
Ago 23 11:33:48 alpha kernel:  [<ffffffff81081102>]
warn_slowpath_common+0x82/0xc0
Ago 23 11:33:48 alpha kernel:  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01d84b9>]
hsw_unclaimed_reg_debug+0x69/0x90 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01db0c9>] gen6_read32+0x59/0x1a0
[i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01ce655>]
intel_lrc_irq_handler+0xe5/0x240 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc018adc7>]
gen8_gt_irq_handler+0x217/0x240 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc018ae91>] gen8_irq_handler+0xa1/0x740
[i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffff810dab8d>]
handle_irq_event_percpu+0x8d/0x1d0
Ago 23 11:33:48 alpha kernel:  [<ffffffff810dad0e>] handle_irq_event+0x3e/0x60
Ago 23 11:33:48 alpha kernel:  [<ffffffff810de24d>] handle_edge_irq+0x7d/0x150
Ago 23 11:33:48 alpha kernel:  [<ffffffff810310fa>] handle_irq+0x1a/0x30
Ago 23 11:33:48 alpha kernel:  [<ffffffff8183095b>] do_IRQ+0x4b/0xd0
Ago 23 11:33:48 alpha kernel:  [<ffffffff8182ea42>] common_interrupt+0x82/0x82
Ago 23 11:33:48 alpha kernel:  <EOI>  [<ffffffffc01cf094>] ?
gen8_emit_request+0x224/0x320 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01bc667>]
__i915_add_request+0x147/0x210 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01b0c36>]
i915_gem_execbuffer_retire_commands+0x26/0x30 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01cf7fb>]
intel_execlists_submission+0x2eb/0x410 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01b05c0>]
i915_gem_do_execbuffer.isra.25+0xfa0/0x12a0 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01b1542>]
i915_gem_execbuffer2+0xb2/0x240 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01be0e2>] ?
i915_gem_busy_ioctl+0x92/0xe0 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc005a742>] drm_ioctl+0x152/0x540 [drm]
Ago 23 11:33:48 alpha kernel:  [<ffffffffc01b1490>] ?
i915_gem_execbuffer+0x310/0x310 [i915]
Ago 23 11:33:48 alpha kernel:  [<ffffffff81220c3f>] do_vfs_ioctl+0x29f/0x490
Ago 23 11:33:48 alpha kernel:  [<ffffffff81220ea9>] SyS_ioctl+0x79/0x90
Ago 23 11:33:48 alpha kernel:  [<ffffffff8182df72>]
entry_SYSCALL_64_fastpath+0x16/0x71
Ago 23 11:33:48 alpha kernel: ---[ end trace 62f496b552421664 ]---


PID 3045 is Xorg in this case.

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