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<body><span class="vcard"><a class="email" href="mailto:elizabethx.de.la.torre.mena@intel.com" title="Elizabeth <elizabethx.de.la.torre.mena@intel.com>"> <span class="fn">Elizabeth</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BAT][SKL] Serial console hung in kms_flip when running IGT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100258">bug 100258</a>
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<th>What</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BAT][SKL] Serial console hung in kms_flip when running IGT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100258#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BAT][SKL] Serial console hung in kms_flip when running IGT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100258">bug 100258</a>
from <span class="vcard"><a class="email" href="mailto:elizabethx.de.la.torre.mena@intel.com" title="Elizabeth <elizabethx.de.la.torre.mena@intel.com>"> <span class="fn">Elizabeth</span></a>
</span></b>
<pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=100258#c1">comment #1</a>)
<span class="quote">> Each character has a 1s timeout in wait_for_xmitr. If the string was log
> enough and the serial console bust, it can easily appear to be hung. As
> wait_for_xmitr keeps poking the nmi watchdog. the slow loop will not be
> caught. If that is correct, this appears to be a hw issue.
>
> An alternative hypothesis is that the usb device struct sent garbage to be
> printed and it really is stuck printing out all of memory, 1 character at a
> time. Kasan might help.
>
> I don't think the vtcon switch of modes is significant.
>
> What would be useful is the dmesg before to see if we can identify what usb
> event triggered.</span >
Hello,
Is this bug still valid? If so, could you attach the dmesg mentioned before or
any other relevant information? Thank you.</pre>
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