[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

--- Comment #37 from Andrew Skalski (voltara@gmail.com) ---
(In reply to Lovekesh Solanki from comment #36)
> I have posted a patch series that addresses
> https://lore.kernel.org/linux-usb/07435e6b-ee30-4c85-8c8b-
> 0ce3a4ead1d9@leemhuis.info/
> 
> It should fix your issue.
> 

I applied your patch to the 7.0 kernel on Ubuntu 26.04, and here are the
results:

OK: I ran "adb" in the background for about two hours without any problems
BAD: The "sleep 0.1; cat /dev/bus/usb/002/001" loop still triggers the lockup

For the "colord" test, I used a patched 6.8 kernel and Ubuntu 24.04 due to
differences in colord behavior between versions (the 24.04 version opened the
device nodes O_RDONLY, but the 26.04 version only tried O_RDWR and failed due
to EACCES.)

OK(?): I tested plugging/unplugging devices for about 10 minutes while colord
was running, without issues.
OK(?): I repeated the colord plug/unplug test with adb running in the
background.  No issues after 10-15 minutes of doing this.

While it doesn't prevent the lockup in all cases, it does improve things.

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