On 13.8.2025 12.48, Michał Pecio wrote:
On Wed, 13 Aug 2025 11:14:04 +0200, Marcus Rückert wrote:
Jul 24 15:56:34 kernel: usb 1-2: reset full-speed USB device number 14 using xhci_hcd Jul 24 15:56:35 kernel: usb 1-2: reset full-speed USB device number 14 using xhci_hcd Jul 24 15:56:36 kernel: usb 1-2: reset full-speed USB device number 14 using xhci_hcd Jul 24 15:56:37 kernel: usb 1-2: reset full-speed USB device number 14 using xhci_hcd Jul 24 15:57:56 kernel: xhci_hcd 0000:0e:00.0: HC died; cleaning up Jul 31 19:53:02 kernel: usb 1-2: reset full-speed USB device number 50 using xhci_hcd Jul 31 19:53:03 kernel: usb 1-2: reset full-speed USB device number 50 using xhci_hcd Jul 31 19:53:04 kernel: usb 1-2: reset full-speed USB device number 50 using xhci_hcd Jul 31 19:53:04 kernel: usb 1-2: reset full-speed USB device number 50 using xhci_hcd Jul 31 19:55:05 kernel: xhci_hcd 0000:0e:00.0: HC died; cleaning up Aug 06 16:51:34 kernel: usb 1-2: reset full-speed USB device number 12 using xhci_hcd Aug 06 16:51:35 kernel: usb 1-2: reset full-speed USB device number 12 using xhci_hcd Aug 06 16:51:36 kernel: usb 1-2: reset full-speed USB device number 12 using xhci_hcd Aug 06 16:51:36 kernel: usb 1-2: reset full-speed USB device number 12 using xhci_hcd Aug 06 16:52:50 kernel: xhci_hcd 0000:0e:00.0: HC died; cleaning up
all HC died events were connected to reset full-speed.
OK, three reset loops and three HC died in the last month, both at the same time, about once a week. Possibly not a coincidence ;)
Not sure if we can confidently say that reverting this patch helped, because a week is just passing today. But the same hardware worked fine for weeks/months/years? before a recent kernel upgrade, correct?
This patch also only concerns SuperSpeed and SuperSpeedPlus (USB 3) devices, so it's unlikely the real cause.
It is possible it reveals some existig race between the SuperSpeed bus and the slower High- and Full-speed bus. Both those buses are handled by the same xHCI controller.
In this setup usb1 is the high+fFull speed bus, and usb2 the SuperSpeed bus
Thanks -Mathias