[ale] checking for process in uninterruptable sleep state

[Boris Borisov]

Well keep us updated.
On May 10, 2016 4:29 PM, "Todor Fassl" <fassl.tod at gmail.com> wrote:

> [Sorry to top post but I am blind and it is very difficult for me to post
> in-line.]
>
> These workstations are in a lab and students  are plugging usb devices
> into them all the time. I was checking the logs on one machine last week
> and I saw that somebody had plugged a web cam in. I am guessing it was for
> skype and/or linphone. I will never be able to pin it down to a specific
> usb device.
>
> But every time a machine is hung, it is always that same file,
> /sys/bus/usb/devices/usb1/descriptors, that causes it to go into an
> uninterruptable sleep. So I think the defective usb device is the usb
> controller itself.
>
> Well, I set the kernel parameter to disable usb autosuspend. I'll post
> back if it works. I did manage to write a script to notifiy me when the
> problem occurs so if the script doesn't trigger in a couple of days, I'm
> going to say it's fixed.
>
>
>
>
>
> On 05/10/2016 10:16 AM, Phil Turmel wrote:
>
>> On 05/10/2016 10:39 AM, Todor Fassl wrote:
>>
>>> Details: I have 15 Dell workstations running ubuntu 15.10 (2 are running
>>> 16.04 -- that did not help). Occasionally, the keyboard and mouse
>>> freeze. Logging in remotely and running lsusb hangs such that you can't
>>> even control-c outand it cannot be killed even with a -9. The process
>>> goes into an uninterruptable sleep during a system call to open the file
>>> /sys/bus/usb/devices/usb1/descriptors. That file is part of the kernel's
>>> control files for the usb controller itself. So you can see why the
>>> keyboard and mouse are dead, the driver for the usb controller itself is
>>> hung.
>>>
>>
>> PS: I wouldn't mind ideas wrt the original problem either. Not that I
>>> hold out any hope for that.
>>>
>>
>> Ah, you have buggy USB devices.  I've run into this.  I used the kernel
>> boot parameter usbcore.autosuspend=-1 to globally disable USB per-device
>> power saving on my mythtv server.  If you can narrow it down to a
>> specific set of devices, you could create udev rules to prevent just
>> those from sleeping.
>>
>> Some links:
>>
>>
>> http://unix.stackexchange.com/questions/91027/how-to-disable-usb-autosuspend-on-kernel-3-7-10-or-above
>>
>>
>> http://askubuntu.com/questions/80638/how-to-disable-auto-power-off-of-usb-devices-like-usb-mouse
>>
>> Phil
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>>
> --
> Todd
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