suspend/resume versus OpenZFS on USB

[Hans Petter Selasky]

On 2020-09-05 11:00, Graham Perrin wrote:
> On 04/09/2020 09:01, Hans Petter Selasky wrote:
>> On 2020-09-04 01:42, Graham Perrin wrote:
>>> This week for the first time I toyed with OpenZFS on a USB device: a 
>>> mobile hard disk drive connected to the dock of an HP EliteBook 8570p.
>>>
>>> A light test, with the pool imported but not writing to the dataset 
>>> at suspend time.
>>>
>>> At resume time (22:31), the device was still physically connected but 
>>> the pool suffered an I/O failure (and the keyboard and trackball on 
>>> USB were unusable).
> …
>> We need output from "procstat -akk" to see where ZFS/USB is hanging.
>>
>> --HPS
> 
> For test purposes I reproduced the behaviour with a different device, a 
> USB flash drive (connected to the same dock).
> 
> Attached:
> 
> 2020-09-05 09:27:55 procstat -akk.txt
> 
> – output from procstat -akk
> 
> 2020-09-05 09:17:59 suspend 09:26:49 resume.txt
> 
> – the output in context.
> 
> Thank you
> 
> Graham
> 
> 

Hi,

USB is not hanging.

It looks like a problem with USB resume, that no devices are recognized, 
until you re-plug them ...

--HPS