Re: Strange issues with USB device

[Marc SCHAEFER <schaefer@alphanet.ch>]

Hello,

On Sat, Aug 24, 2024 at 08:44:37AM +0200, Micha?? Pecio wrote:
> What sort of kernel is this?

5.10.0-32-amd64 #1 SMP Debian 5.10.223-1 (2024-08-10) x86_64 GNU/Linux

If required, I can try a backport 6.x, or even compile manually
a last stable 6.x

> Looks like there are some stream-related xhci_hcd bugs here. You may
> have more luck with UAS disabled if you need this system working ASAP.

There is no urgency, but yes, I will try that.

> Not only SMART is failing, but also ordinary block reads and maybe
> writes as well, so it could potentially be a risk of data loss.

I am test-qualifying this system for a few weeks now, and that bug
only happened under very high load, apparently.  So far no data
corruption (data comparison is part of the test).

> For debugging, it would help to have a reliable trigger, like "happens
> every time I run smartctl manually" or "every time I do it while
> 'cat /dev/sdc >/dev/null'" or at least "often while <some workload>".

This seems to be encountered when I do an array check with mdadm,
and when I adjust the min and max speed to the max.

> I am able to find the PCI adapter responsible for a USB bus like this:
> 
> $ ls -d /sys/bus/pci/devices/*/usb8
> /sys/bus/pci/devices/0000:02:00.0/usb8

Thank you.