[Bug 95311] New: Unclaimed register detected before reading register 0x44200

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=95311

            Bug ID: 95311
           Summary: Unclaimed register detected before reading register
                    0x44200
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0.0-rc4+
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: adrian.v.owen at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 171801
  --> https://bugzilla.kernel.org/attachment.cgi?id=171801&action=edit
log of output from drm.debug

Hi, I get these stack traces in dmesg.  I've attached a text file with output
from drm.debug=0xe if it is of some help.


Mar 23 09:51:22 notebook kernel: ------------[ cut here ]------------
Mar 23 09:51:22 notebook kernel: WARNING: CPU: 0 PID: 0 at
drivers/gpu/drm/i915/intel_uncore.c:551
hsw_unclaimed_reg_debug.isra.13+0x78/0x90 [i915]()
Mar 23 09:51:22 notebook kernel: Unclaimed register detected before reading
register 0x44200
Mar 23 09:51:22 notebook kernel: Modules linked in: xen_acpi_processor usbhid
snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel
snd_hda_controller snd_hda_codec btusb i915 snd_hwdep snd_pcm snd_timer
thinkpad_acpi ehci_pci snd ehci_hcd iwlmvm xhci_pci xhci_hcd drm_kms_helper drm
iwlwifi usbcore iTCO_wdt lpc_ich i2c_i801 usb_common x86_pkg_temp_thermal
coretemp
Mar 23 09:51:22 notebook kernel: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G      
 W       4.0.0-rc4+ #4
Mar 23 09:51:22 notebook kernel: Hardware name: LENOVO 20BVCTO1WW/20BVCTO1WW,
BIOS JBET45WW (1.10 ) 02/03/2015
Mar 23 09:51:22 notebook kernel:  ffffffffa0370858 ffff88022ee03ca8
ffffffff817a9078 0000000000000000
Mar 23 09:51:22 notebook kernel:  ffff88022ee03cf8 ffff88022ee03ce8
ffffffff81076a05 ffff8800a22d3f58
Mar 23 09:51:22 notebook kernel:  ffff8800adc90060 ffff8800adc90000
ffff8800adc90068 ffff8800adc90060
Mar 23 09:51:22 notebook kernel: Call Trace:
Mar 23 09:51:22 notebook kernel:  <IRQ>  [<ffffffff817a9078>]
dump_stack+0x45/0x57
Mar 23 09:51:22 notebook kernel:  [<ffffffff81076a05>]
warn_slowpath_common+0x85/0xc0
Mar 23 09:51:22 notebook kernel:  [<ffffffff81076a81>]
warn_slowpath_fmt+0x41/0x50
Mar 23 09:51:22 notebook kernel:  [<ffffffffa02fa2e8>]
hsw_unclaimed_reg_debug.isra.13+0x78/0x90 [i915]
Mar 23 09:51:22 notebook kernel:  [<ffffffffa02fba27>] gen6_read32+0x57/0x1b0
[i915]
Mar 23 09:51:22 notebook kernel:  [<ffffffffa02e9dba>]
gen8_irq_handler+0x4a/0x4a0 [i915]
Mar 23 09:51:22 notebook kernel:  [<ffffffff8100a31c>] ?
xen_timer_interrupt+0x10c/0x150
Mar 23 09:51:22 notebook kernel:  [<ffffffff810be357>]
handle_irq_event_percpu+0x47/0x1a0
Mar 23 09:51:22 notebook kernel:  [<ffffffff810be4e5>]
handle_irq_event+0x35/0x60
Mar 23 09:51:22 notebook kernel:  [<ffffffff810c10d7>]
handle_edge_irq+0x77/0x110
Mar 23 09:51:22 notebook kernel:  [<ffffffff810bd9e6>]
generic_handle_irq+0x26/0x40
Mar 23 09:51:22 notebook kernel:  [<ffffffff813abf12>]
evtchn_fifo_handle_events+0x162/0x170
Mar 23 09:51:22 notebook kernel:  [<ffffffff813a9127>]
__xen_evtchn_do_upcall+0x47/0x80
Mar 23 09:51:22 notebook kernel:  [<ffffffff813aad2f>]
xen_evtchn_do_upcall+0x2f/0x50
Mar 23 09:51:22 notebook kernel:  [<ffffffff817b32ce>]
xen_do_hypervisor_callback+0x1e/0x40
Mar 23 09:51:22 notebook kernel:  <EOI>  [<ffffffff810013aa>] ?
xen_hypercall_sched_op+0xa/0x20
Mar 23 09:51:22 notebook kernel:  [<ffffffff810013aa>] ?
xen_hypercall_sched_op+0xa/0x20
Mar 23 09:51:22 notebook kernel:  [<ffffffff8100a020>] ?
xen_safe_halt+0x10/0x20
Mar 23 09:51:22 notebook kernel:  [<ffffffff8101d89e>] ? default_idle+0x1e/0xb0
Mar 23 09:51:22 notebook kernel:  [<ffffffff8101e21a>] ? arch_cpu_idle+0xa/0x10
Mar 23 09:51:22 notebook kernel:  [<ffffffff810ade04>] ?
cpu_startup_entry+0x274/0x400
Mar 23 09:51:22 notebook kernel:  [<ffffffff817a1a92>] ? rest_init+0x72/0x80
Mar 23 09:51:22 notebook kernel:  [<ffffffff81ceb095>] ?
start_kernel+0x43c/0x449
Mar 23 09:51:22 notebook kernel:  [<ffffffff81ceaa49>] ? set_init_arg+0x55/0x55
Mar 23 09:51:22 notebook kernel:  [<ffffffff81cea5ee>] ?
x86_64_start_reservations+0x2a/0x2c
Mar 23 09:51:22 notebook kernel:  [<ffffffff81cee54b>] ?
xen_start_kernel+0x542/0x54e
Mar 23 09:51:22 notebook kernel: ---[ end trace c236e86d5a039bd6 ]---

Thanks,

Adrian Owen

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