[Bug 94171] Linux 4.3 Broadwell Unclaimed register detected before reading register 0x22394

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94171

--- Comment #1 from Arthur Țițeică <a.titeica at navx.com> ---
Created attachment 121782
  --> https://bugs.freedesktop.org/attachment.cgi?id=121782&action=edit
dmesg

Another trace with 'drm.debug=0x1e log_buf_len=1M' on the kernel command line.

cat /sys/class/drm/card0/error
no error state collected

I also attached the dmesg log.

------------[ cut here ]------------
WARNING: CPU: 2 PID: 0 at drivers/gpu/drm/i915/intel_uncore.c:620
hsw_unclaimed_reg_debug+0x82/0xa0 [i915]()
Unclaimed register detected before reading register 0x223a0
Modules linked in: ctr ccm joydev mousedev btusb btrtl btbcm btintel bluetooth
iptable_raw bridge stp llc ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat
nf_nat_ipv4 nf_nat iptable_mangle xt_limit snd_hda_codec_realtek xt_tcpudp 
 snd_hwdep toshiba_acpi ptp mei_me memstick lpc_ich snd_pcm mei pps_core shpchp
snd_timer thermal sparse_keymap toshiba_bluetooth toshiba_haps rfkill snd
soundcore fjes wmi dw_dmac dw_dmac_core i2c_designware_platform snd_soc_sst_a
 i8042 serio sdhci_acpi sdhci led_class video mmc_core button
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.3.5.201602092235-1-grsec #1
Hardware name: TOSHIBA SATELLITE Z30-B/SATELLITE Z30-B, BIOS Version 3.20  
04/09/2015
 ffffffff00000002 0de1c3e764217778 0000000000000000 ffffffffc03f8dd0
 ffff880221283cb0 ffffffff9e2d7360 ffff880221283cf8 ffff880221283ce8
 ffffffff9e064e18 ffffffffc03f8dd0 000000000000026c ffffffffc03f8d98
Call Trace:
 <IRQ>  [<ffffffff9e2d7360>] dump_stack+0x4b/0x8b
 [<ffffffff9e064e18>] warn_slowpath_common+0x78/0xb0
 [<ffffffff9e064ebb>] warn_slowpath_fmt+0x6b/0xa0
 [<ffffffffc0237ec2>] hsw_unclaimed_reg_debug+0x82/0xa0 [i915]
 [<ffffffffc023cb8d>] gen6_read32+0x4d/0x130 [i915]
 [<ffffffffc022da16>] intel_lrc_irq_handler+0x46/0x270 [i915]
 [<ffffffffc01f6c8f>] gen8_gt_irq_handler+0x20f/0x240 [i915]
 [<ffffffffc01f6d5f>] gen8_irq_handler+0x9f/0x5e0 [i915]
 [<ffffffff9e0bb5ea>] handle_irq_event_percpu+0x7a/0x130
 [<ffffffff9e0dac62>] ? clockevents_program_event+0x82/0x120
 [<ffffffff9e0bb6db>] handle_irq_event+0x3b/0x60
 [<ffffffff9e0be9c1>] handle_edge_irq+0xd1/0x190
 [<ffffffff9e006739>] handle_irq+0x29/0x40
 [<ffffffff9e005fa8>] do_IRQ+0x48/0xe0
 [<ffffffff9e5ece8e>] common_interrupt+0x8e/0x8e
 <EOI>  [<ffffffff9e45fc46>] ? cpuidle_enter_state+0x156/0x210
 [<ffffffff9e45fc3f>] ? cpuidle_enter_state+0x14f/0x210
 [<ffffffff9e45fd60>] cpuidle_enter+0x20/0x30
 [<ffffffff9e0ab307>] call_cpuidle+0x37/0x70
 [<ffffffff9e0ab4ed>] cpu_startup_entry+0x1ad/0x270
 [<ffffffff9e040b50>] ? lapic_get_maxlvt+0x40/0x40
 [<ffffffff9e047b90>] ? flat_init_apic_ldr+0x90/0x90
 [<ffffffff9e03eaf6>] start_secondary+0x1c6/0x200
---[ end trace abb82de0cb167d64 ]---

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