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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW][EXT] igt@kms_flip@vblank-vs-dpms-suspend-interruptible hard LOCKUP on cpu 3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100419#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW][EXT] igt@kms_flip@vblank-vs-dpms-suspend-interruptible hard LOCKUP on cpu 3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100419">bug 100419</a>
from <span class="vcard"><a class="email" href="mailto:libin.yang@intel.com" title="Libin Yang <libin.yang@intel.com>"> <span class="fn">Libin Yang</span></a>
</span></b>
<pre>I will debug on this issue. This is really strange that it shows:
<4>[ 1211.603059] ? delay_tsc+0x3d/0xc0
<4>[ 1211.603059] __delay+0xa/0x10
<4>[ 1211.603060] __const_udelay+0x31/0x40
<4>[ 1211.603060] snd_hdac_bus_stop_cmd_io+0x96/0xe0 [snd_hda_core]
>From my knowledge snd_hdac_bus_stop_cmd_io() will not cause such issue. So my
opinion is that maybe audio use udelay while delay_tsc() cause this issue
(which is the last dump of the oops). Maybe the tsc is off when audio is still
waiting for its response? What's your suggestion? If so, I think we can ask
kernel team to involve?</pre>
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