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I have a Pi that has recently developed a habit of maxing the SD card with syslog messages (somewhere in the hundreds per second) of the message: "Date/Time user kernel: [ 2257.432445] rc rc0: IR event FIFO is full!"

I found this bug report and it was closed in Feb 2019 as "resolved". I looked at the change log for kernel version "linux/4.9.228-1" and found these 3 lines that seem possibly-related but nothing definitive:

    - USB: serial: ir-usb: add missing endpoint sanity check
    - USB: serial: ir-usb: fix link-speed handling
    - USB: serial: ir-usb: fix IrLAP framing

I also found this bug report and tried adding the following items to /etc/modprobe.d/blacklist-ir_event_fifo_is_full.conf and rebooted:

blacklist ir_lirc_codec
blacklist lirc_dev
blacklist sunxi-cir

I then discovered which mods are active with lsmod | grep "ir", revealing:

Module                  Size  Used by
ir_rc6_decoder         16384  0

So I tried adding that to the blacklist file and rebooted:

blacklist ir_rc6_decoder

And still, this doesn't seem to keep it from loading or stop the logs from filling up. Both /var/log/kern.log and /var/log/syslog fill with these same messages.

I haven't found anything recent where this was happening and have exhausted my searching abilities. I mean, searching for "rc rc0: IR event FIFO is full!" in Google with quotes yields 5 results that all seem to be log files.

I'm looking for any guidance on how to stop these messages from accumulating and filling up the SD card.

Peace, Kevin

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  • Any guidance on what? What is the question? – joan May 2 at 9:29
  • @joan, I updated it to be more clear. I need to stop the logging for that particular message so it stops filling up the SD card. It's currently at a rate of many megabits per minute. So after a few hours, the SD card is completely full. – Beez May 3 at 22:39
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The way I would approach this problem, if it is just one specific/consistent log message causing trouble, would be to use the filter conditions built into rsyslog. Here is an example of an expression-based filter structure I've used from the relevant rsyslog documentation:

if expr then action-part-of-selector-line

Use the expression arg to capture the message giving your poor SD card grief, and set the selector action to '/dev/null' for example. Pop that filter into a configuration file that defines the log where the message is being stored and that should solve your issue.

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