Hi back from my vacation. On 27.07.2017 04:04, Jason A. Donenfeld wrote:
Hey Mathias, While the oops has been fixed in the latest kernels, as of 4.12.3, I'm still having issues where USB "stops working" after a while. If I restart, then after a long while, it stops working again. If I simply rmmod all the USB-related modules and modprobe xhci_pci, things work again, but pretty soon after -- maybe 15ish minutes -- it's broken again. If it's of any help, I'm often plugging and unplugging a USB hub with quite a few devices on it. The message in my dmesg this time isn't an BUG, like in the previous kernels, but rather this more subdued set of messages: [529153.583731] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [529159.215731] xhci_hcd 0000:00:14.0: ERROR mismatched command completion event [529159.215768] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Odd, looks like something could still messed up with the comma queue, or events are received out of order. Or maybe we don't get the interrupt for command completion event. Any chance you could take traces of this? It would show more details about the queued commands and completions. xhci traces can be taken with: mount -t debugfs none /sys/kernel/debug echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable then after issue triggers send me the content of /sys/kernel/debug/tracing/trace (it will be huge) and dmesg Thanks Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
