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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67813#c54">Comment # 54</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67813">bug 67813</a>
from <span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=99372" name="attach_99372" title="dmesg">attachment 99372</a> <a href="attachment.cgi?id=99372&action=edit" title="dmesg">[details]</a></span>
dmesg
(In reply to <a href="show_bug.cgi?id=67813#c53">comment #53</a>)
<span class="quote">> For reference Chris' patch:
>
> <a href="http://patchwork.freedesktop.org/patch/16792/">http://patchwork.freedesktop.org/patch/16792/</a>
>
> Please test this patch.</span >
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 ]------------</pre>
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