[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 #12 from Michał Pecio (michal.pecio@gmail.com) ---
Isn't the required serial cable identical as in 99% of motherboards? ASUS is
usually decent enough to show all details, including pinout, in the user
manual.

Maybe one thing worth trying is to enable dynamic debug and run an iteration or
a few to see what gets logged in dmesg, check if it changes or is always the
same and compare the "bad" root hub with good ones, particularly of the same
speed.

echo 'module xhci_hcd +p' >/proc/dynamic_debug/control
dmesg -W

The most interesting information may be missing if it actually crashes, but
maybe something will hint at any unusual patterns in your system.

One thing I see is that this code tries to check status of the ports, so your
crashes may (or may not) depend on some particular device being connected.

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