I'm only posting to say I'm still waiting... The error came up while I slept, and when I copied that log and looked at it (yes, it WAS huge, just as you said), the timestamps at the head/tail were much later than the journal logged times. So I made a little script to monitor the journal kernel entries for that message and have it copy the file after maybe 5 seconds. And now, I'm just waiting for that error to occur again. 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
