[Bug 67813] [HSW bisected]igt/module_reload causes [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44004 and system hang with headless, with power well disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67813

--- Comment #54 from lu hua <huax.lu at intel.com> ---
Created attachment 99372
  --> https://bugs.freedesktop.org/attachment.cgi?id=99372&action=edit
dmesg

(In reply to comment #53)
> For reference Chris' patch:
> 
> http://patchwork.freedesktop.org/patch/16792/
> 
> Please test this patch.

Test this patch, the hang goes away.
It causes call trace.

output:
module successfully unloaded
module successfully loaded again

[   35.971940] WARNING: CPU: 4 PID: 4123 at drivers/gpu/drm/drm_crtc.c:4704
drm_mode_config_cleanup+0x164/0x212 [drm]()
[   35.971985] Modules linked in: ipv6 dm_mod snd_hda_codec_realtek
snd_hda_codec_hdmi snd_hda_codec_generic iTCO_wdt iTCO_vendor_support serio_raw
pcspkr i2c_i801 lpc_ich mfd_c
ore snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery wmi tpm_infineon tpm_tis tpm acpi_cpufreq i915(-) video button
drm_kms_helper drm [last un
loaded: snd_hda_intel]
[   35.973233] CPU: 4 PID: 4123 Comm: rmmod Not tainted
3.14.0_kcloud_f0122d_20140520+ #38
[   35.973276] Hardware name: ASUS All Series/Z87-EXPERT, BIOS 1008 05/17/2013
[   35.973318]  0000000000000006 ffffffff81709105 0000000000000000
ffffffff81033f78
[   35.973508]  ffffffffa000d305 ffff880251774000 ffff8802517743b8
ffff8802517742a0
[   35.973698]  ffff8802517743c8 ffffffffa000d305 ffff880251774000
ffff8802517742a0
[   35.973890] Call Trace:
[   35.974011]  [<ffffffff81709105>] ? dump_stack+0x41/0x51
[   35.974132]  [<ffffffff81033f78>] ? warn_slowpath_common+0x6f/0x84
[   35.974255]  [<ffffffffa000d305>] ? drm_mode_config_cleanup+0x164/0x212
[drm]
[   35.974379]  [<ffffffffa000d305>] ? drm_mode_config_cleanup+0x164/0x212
[drm]
[   35.974507]  [<ffffffffa00a6d15>] ? intel_modeset_cleanup+0xca/0xf0 [i915]
[   35.974633]  [<ffffffffa00c9000>] ? i915_driver_unload+0xaf/0x28e [i915]
[   35.974760]  [<ffffffffa000759e>] ? drm_dev_unregister+0x1e/0x8b [drm]
[   35.974883]  [<ffffffffa000775b>] ? drm_put_dev+0x45/0x4e [drm]
[   35.975004]  [<ffffffff812f3c79>] ? pci_device_remove+0x38/0x80
[   35.975126]  [<ffffffff813758ec>] ? __device_release_driver+0x7e/0xd4
[   35.975246]  [<ffffffff81375ec3>] ? driver_detach+0x71/0x9a
[   35.975367]  [<ffffffff81375657>] ? bus_remove_driver+0x60/0x7d
[   35.975487]  [<ffffffff812f3411>] ? pci_unregister_driver+0x17/0x75
[   35.975611]  [<ffffffffa0008ec8>] ? drm_pci_exit+0x37/0x96 [drm]
[   35.975733]  [<ffffffff8107caf0>] ? SyS_delete_module+0x10c/0x182
[   35.975855]  [<ffffffff810024f9>] ? do_notify_resume+0x4e/0x5d
[   35.975991]  [<ffffffff817138ea>] ? int_signal+0x12/0x17
[   35.976114]  [<ffffffff81713662>] ? system_call_fastpath+0x16/0x1b
[   35.976234] ---[ end trace c063e9f88c0c47fc ]---
[   35.976357] [drm:intel_crtc_cursor_set] cursor off
[   35.976358] [drm:intel_crtc_cursor_set] cursor off
[   35.976359] [drm:intel_crtc_cursor_set] cursor off
[   35.977844] ------------[ cut here ]------------

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