Messages in this thread | | | Date | Fri, 21 Oct 2016 12:54:09 -0400 (EDT) | From | Alan Stern <> | Subject | Re: PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due to timer wheel rework |
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On Fri, 21 Oct 2016, Michael Thayer wrote:
> 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
That bug description says the watchdog timer routine can be called twice in a 4-ms period, even though it requests a 250-ms delay. Is this really true? If it is, it sounds like a real bug in the timer core.
Bryan Paluch reported a similar problem and said that increasing the timeout value to 275 ms fixed it:
http://marc.info/?l=linux-usb&m=147670889009451&w=2
Does that patch also fix the "frame counter not updating" problem?
Alan Stern
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