[Bug 100258] [BAT][SKL] Serial console hung in kms_flip when running IGT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100258

Elizabeth <elizabethx.de.la.torre.mena at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
(In reply to Chris Wilson from comment #1)
> 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.

Hello,
Is this bug still valid? If so, could you attach the dmesg mentioned before or
any other relevant information? Thank you.

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