Re: kernel: xhci_hcd 0000:00:14.0: ERROR unknown event type 37 - Kernel 4.19.13

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On 01.01.2019 20:57, Nathan Royce wrote:
Kernel 4.19.13

00:14.0 USB controller: Intel Corporation 9 Series Chipset Family USB
xHCI Controller

Around 400 "unknown event type 37" messages logged in a 2 second span.
*****
Jan 01 02:08:07 computername tvheadend[2370]: linuxdvb: Auvitek AU8522
QAM/8VSB Frontend #0 : ATSC-T #0 - poll TIMEOUT
Jan 01 02:08:00 computername tvheadend[2370]: linuxdvb: Auvitek AU8522
QAM/8VSB Frontend #0 : ATSC-T #0 - poll TIMEOUT
Jan 01 02:07:56 computername kernel: xhci_hcd 0000:00:14.0: ERROR
unknown event type 37
...
Jan 01 02:07:55 computername kernel: xhci_hcd 0000:00:14.0: ERROR
unknown event type 37
Jan 01 02:07:55 computername kernel: xhci_hcd 0000:00:14.0: ERROR
unknown event type 37
Jan 01 02:07:52 computername tvheadend[2370]: linuxdvb: Auvitek AU8522
QAM/8VSB Frontend #0 : ATSC-T #0 - poll TIMEOUT
Jan 01 02:07:44 computername tvheadend[2370]: linuxdvb: Auvitek AU8522
QAM/8VSB Frontend #0 : ATSC-T #0 - poll TIMEOUT
*****

I question whether this also caused kemleak to crash as well (will
post after this).

Regarding my tv tuner, it isn't supported by the kernel specifically,
but is close enough that all I have to do is alter a single source
file to include my device's pid, and it works just fine almost all of
the time.


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



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