[Bug 221103] xhci_hcd: System lockup under CPU load during usbfs polling of USB devices on AMD platforms

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221103

S. Davar (gtschemer@gmail.com) changed:

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                 CC|                            |gtschemer@gmail.com

--- Comment #25 from S. Davar (gtschemer@gmail.com) ---
I have been supporting users on an atomic distribution, so no one has tried the
test patch.

However, 4+ users who had this freeze behavior on ASUS motherboards with Ryzen
5 / 7 / 9 CPUs seem to have 100% success manually setting all the xHCI
controllers to "on" instead of "auto".

All of those users froze very quickly with the usb_poll test, and never froze
after changing the xHCI power control behavior.  Most have a B650M or similar
motherboard.


Was anyone with the freeze able to try the test patch?  Also, are there any
concerns that a small delay might still be unreliable, e.g. long enough in some
cases but not long enough in others?  Could it potentially cause a performance
hit in some cases, or is it expected to be called rarely enough that it doesn't
matter?

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