You can ignore the last set of files with a sample of 1. I got a nice sample of like 150 about 6 hours ago. The link I included in the previous reply contains the same filenames, just updated. The journal timestamps (to correspond with the trace times) go from "[513438.430253] computername kernel: xhci_hcd 0000:00:14.0: ERROR unknown event type 37" to "[513438.796965] computername kernel: xhci_hcd 0000:00:14.0: ERROR unknown event type 37" That's 150 of them in less than 1/2 second. On Wed, Jan 2, 2019 at 5:32 AM Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote: > > The event type 37 is a host controller event, most likely a event ring full error. > > So there are probably so many events that we fill the event ring before we can handle them. > > Could you take traces of this? > Note that the trace file will be huge. > > 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 > > copy the traces somewhere safe once the error is triggered: > cp /sys/kernel/debug/tracing/trace /<somewhere> > > -Mathias
