linux-kernel - PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due to timer wheel rework

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Date:   Fri, 21 Oct 2016 17:29:02 +0200
From:   Michael Thayer <michael.thayer@...cle.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Michal Necasek <michal.necasek@...cle.com>,
        "Knut St. Osmundsen" <knut.osmundsen@...cle.com>
Subject: PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due to
 timer wheel rework

Hello Alan (LKML on CC),

Contacting you about this on Thomas Gleixner's (also on CC) suggestion. 
The short summary is that when Linux 4.8.0 (also tested with a few later 
kernels) is run on a VirtualBox virtual machine with USB enabled, OHCI 
fails with the log messages "frame counter not updated; disabled" and 
"HC died; cleaning up".  This seems to be due to the 250 ms interval 
watchdog running with far too short intervals, which we think is a 
consequence of the timer wheel code rework.  I will refer you to a bug 
filed in Launchpad<1> for a longer description.

Hope this is of interest to you.

Regards,

Michael

<1> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634737
-- 
Michael Thayer | VirtualBox engineer
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