[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 #15 from Paul Alesius (paul@unnservice.com) ---
(In reply to Alan Stern from comment #14)
> Have you tried disabling runtime PM?  Run any of the test scenarios after
> booting with "usbcore.autosuspend=-1" on the boot command line.

Disabling runtime PM for USB has eliminated the freeze, tested with hammering
all devices too for 40 minutes.

---- Other logs:

With runtime PM enabled, I see this in dmesg on every boot:
[   17.918387] xhci_hcd 0000:78:00.0: WARN: xHC CMD_RUN timeout
[   17.918508] xhci_hcd 0000:78:00.0: PM: suspend_common(): xhci_pci_suspend
returns -110
[   17.918586] xhci_hcd 0000:78:00.0: can't suspend (hcd_pci_runtime_suspend
returned -110)

But 0000:78:00.0 is a different controller than the root hub that triggers the
freeze. Here's lsusb with controller information:

0000:0e:00.0 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
0000:0e:00.0 Bus 001 Device 002: ID 13d3:3588 IMC Networks Wireless_Device
(Internal)
0000:0e:00.0 Bus 001 Device 003: ID 0b05:19af ASUSTek Computer, Inc. AURA LED
Controller (Internal)
0000:0e:00.0 Bus 001 Device 004: ID 046d:c548 Logitech, Inc. Logi Bolt Receiver
(Plugged in)
0000:0e:00.0 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
0000:10:00.0 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
0000:10:00.0 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
0000:78:00.0 Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
(xhci_pci_suspend -110)
0000:78:00.0 Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
(xhci_pci_suspend -110)
0000:7a:00.3 Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
0000:7a:00.3 Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
0000:7a:00.4 Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
0000:7a:00.4 Bus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
(Triggers freeze with runtime PM)
0000:7b:00.0 Bus 011 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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