[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 #13 from Paul Alesius (paul@unnservice.com) ---
(In reply to Michał Pecio from comment #12)
> 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.

I just triggered the system freeze three times with dynamic debug and dmesg -W.
Each time, the last message shown in the console is:

"Setting command ring address to 0x10e427001"

Dmesg logs "Setting command ring address" twice, and all three freezes occured
after the first of the two log records of "Setting command address"

Demsg example below, it did not flush to disk so the "dmesg -W" to the terminal
has newer log records but this is what I see in the console:

------ dmesg -W

...
[ 1139.446048] xhci_hcd 0000:7a:00.4: xhci_suspend: stopping usb9 port polling.
[ 1139.446066] xhci_hcd 0000:7a:00.4: Setting command ring address to
0x10e427001
[ 1139.561526] xhci_hcd 0000:7a:00.4: Setting command ring address to
0x10e427001
[ 1139.562304] xhci_hcd 0000:7a:00.4: xhci_resume: starting usb9 port polling.
[ 1139.562306] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb10 port
polling
[ 1139.562308] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb9 port
polling
[ 1139.585922] xhci_hcd 0000:7a:00.4: Get port status 10-1 read: 0x2a0, return
0x2a0
[ 1139.585931] xhci_hcd 0000:7a:00.4: Get port status 10-2 read: 0x2a0, return
0x2a0
[ 1139.792600] xhci_hcd 0000:7a:00.4: set port remote wake mask, actual port
10-1 status  = 0xe0002a0
[ 1139.792619] xhci_hcd 0000:7a:00.4: set port remote wake mask, actual port
10-2 status  = 0xe0002a0
[ 1139.792662] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb10 port
polling
[ 1139.792667] xhci_hcd 0000:7a:00.4: config port 10-1 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1139.792683] xhci_hcd 0000:7a:00.4: config port 10-2 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1139.792705] xhci_hcd 0000:7a:00.4: config port 9-1 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1139.792726] xhci_hcd 0000:7a:00.4: config port 9-2 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1139.792727] xhci_hcd 0000:7a:00.4: xhci_suspend: stopping usb9 port polling.
[ 1139.792746] xhci_hcd 0000:7a:00.4: Setting command ring address to
0x10e427001
[ 1139.821295] xhci_hcd 0000:7a:00.4: Setting command ring address to
0x10e427001
[ 1139.822070] xhci_hcd 0000:7a:00.4: xhci_resume: starting usb9 port polling.
[ 1139.822072] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb10 port
polling
[ 1139.822074] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb9 port
polling
[ 1139.845924] xhci_hcd 0000:7a:00.4: Get port status 10-1 read: 0x2a0, return
0x2a0
[ 1139.845931] xhci_hcd 0000:7a:00.4: Get port status 10-2 read: 0x2a0, return
0x2a0
[ 1140.052603] xhci_hcd 0000:7a:00.4: set port remote wake mask, actual port
10-1 status  = 0xe0002a0
[ 1140.052621] xhci_hcd 0000:7a:00.4: set port remote wake mask, actual port
10-2 status  = 0xe0002a0
[ 1140.052664] xhci_hcd 0000:7a:00.4: xhci_hub_status_data: stopping usb10 port
polling
[ 1140.052670] xhci_hcd 0000:7a:00.4: config port 10-1 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1140.052685] xhci_hcd 0000:7a:00.4: config port 10-2 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1140.052706] xhci_hcd 0000:7a:00.4: config port 9-1 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1140.052727] xhci_hcd 0000:7a:00.4: config port 9-2 wake bits, portsc:
0xa0002a0, write: 0xa0202a0
[ 1140.052728] xhci_hcd 0000:7a:00.4: xhci_suspend: stopping usb9 port polling.
[ 1140.052747] xhci_hcd 0000:7a:00.4: Setting command ring address to
0x10e427001

-- On plugged-in USB devices

There are 3 devices plugged in to USB, two are internal:

noname@devbox ~ $ sudo lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 13d3:3588 IMC Networks Wireless_Device (INTERNAL M.2
WiFi & Bluetooth)
Bus 001 Device 003: ID 0b05:19af ASUSTek Computer, Inc. AURA LED Controller
(INTERNAL)
Bus 001 Device 004: ID 046d:c548 Logitech, Inc. Logi Bolt Receiver (I have this
one plugged in for mouse and keyboard)
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 011 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I changed the port of the Logitech Bolt Receiver during these three tests with
system freeze, and plugged it into a USB 2.0 port, but the system still freezes
on that root hub.

---------

If there's anything else to try to get more diagnostics, I can do that too,
otherwise we'll have to wait until I receive the adapter for netconsole.

I am unable to remove the M.2 wifi card at present because I need to
disassemble the entire computer and take out the MB because it's behind
shielding covers that are not meant to be removed.

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