Sorry, I had a stupid typo in that command - it should have been /storage/.cache/cores, not /storage/cache/.cores - this is what I get for not using copy&paste but typing stuff manually 
It looks like you already found the culprit, so I think you should be fine and we won't need more info.
so long,
Hias
Check the contents of the /storage/cache/.cores/ directory - the core file names should include the program name.
eg post the output of
ls -l /storage/cache/.cores/ | head -10When you notice that a new core file had been created it'd also be useful to post your journal - that should contain some additional info what crashed, and maybe why. run the following command and post the output:
journalctl -a | pastebinitBTW: probably the number one reason for unexplainable crashes on RPis is a bad power supply. The official RPi power supply is known to be good, use that if in doubt.
so long,
Hias
Can you upload the kodi log where you press some of those buttons?
My guess is the remote shows up as a keyboard in kodi and it's sending some keycodes that kodi doesn't handle - the logfile should tell us what's happening.
so long,
Hias
Also even after 9.1.002 update there still seems to be a very minor amount of stuttering on a 1080p x265 video. Is there any way to generate a report on this and upload it here?
A debug log might help. Enable debug logging in Kodi, reboot your RPi, play that file until you see the stuttering, then stop it and use the logfile upload function in LE settings and post the URL here.
See Provide Log File [LibreELEC.wiki] for details
so long,
Hias
I'm still missing full HBR audio support for RPi4. DTS HD MA is detected just like DTS and in option of Kodi there is no option to turn on DTS HD MA.
HBR audio isn't implemented yet for the RPi4. It's in the queue but will take a bit (probably months, not weeks).
so long,
Hias
I haven't looked at the temperatures but yesterday I experienced asynchronous video playback on a 1080p Netflix stream. Video was up to two seconds behind the audio but after a scene cut it was in sync again for 1 or 2 minutes. Maybe it has something to do with the cpu temperature.
I'm using the Pi4 without a case but I have a hifiberry on the GPIO
Quite certainly the CPU was maxed out and the RPi couldn't keep up with decoding the video.
While that can be caused by high temperature (and thus throttling, in which case you should see the thermometer icon pop up) I've also seen that with some streams (eg Black Mirror S01E02 at around 59:30-1:00:00) which have very high peak bitrate scenes.
The RPi4 probably needs to be overclocked to keep up with this - or switch to the next lower bitrate stream (IIRC the ~7Mbit/sec 1080p Black Mirror stream peaked to about 11-13Mbit/sec and ran into a/v sync issues, the ~6Mbit/sec 1080p stream played fine). Limiting the max bitrate may also help with that.
so long,
Hias
This is what I assumed, but also read that libreelec ships with upgraded firmware. So, is that true? Does it flash the (Pi Hardware) firmware on (Libreelec) version updates?
LE 9.1.002 ships with updated VideoCore / VPU firmware - the other 2 firmwares (bootloader and USB chip) which are in flash chips aren't touched.
so long,
Hias
Try disabling the pvr client addon, reboot and check if you still have high CPU usage.
Can't recommend anything else ATM without seeing your full debug log.
so long,
Hias
Can you post kodi debug log as well? perf top shows some hefty xml prcessing going on - could be pvr/xmltv addon for example.
so long,
Hias
You can run perf top and check kodi debug log to get some more detailed info. Such high CPU load is definitely not normal - most of the time that's caused by some misbehaving/broken addon.
so long,
Hias
Easiest way is to enable debug logging in kodi and then watch kodi log as you press buttons. eg
tail -f .kodi/temp/kodi.logYou can also use evtest from the system tools addon, but you have to make sure you've stopped kodi and eventlircd as both of them might grab the input device and thus evtest doesn't report any buttons/keys (evtest will warn you about that). BTW: If eventlircd grabbed the remote input button presses will show up as LIRC events instead of keyboard/input events in kodi.
so long,
Hias
This is a known issue. With the updated firmware it's a lot better (but still not 100% perfect). An updated LibreELEC version (with new firmware) should be released real soon now.
BTW: You can also disable the slide animations in Estuary skin setting if the tearing is too annoying for you.
so long,
Hias
The LE kernel has a built-in initramfs, taking care of the early linux init steps of LE, so using it on another distro won't quite work (it'll have exactly the result you posted).
It's probably easiest to just build a kernel yourself, using the LE kernel config linux.arm.conf
so long,
Hias
Both of the mentioned log files don't seem to give any extra info and simply repeat the error I quoted here. Hopefully this will shed some light on the issue.
Please post the contents of the logfiles, sometimes they contain references to other logs (eg failed dependencies) so it's worth to check them, too.
If in doubt capture the full build log and upload it somewhere (it could be huge, though). eg
ARCH=arm PROJECT=RPi DEVICE=RPi4 make image 2>&1 | tee build.logso long,
Hias
How to build an image for the rpi4 from the Github source? I've tried the build instructions and used device=rpi4 but that doesn't seem to work.
"Doesn't seem to work" isn't too specific. I use this to build RPi4 images:
ARCH=arm PROJECT=RPi DEVICE=RPi4 make imageso long,
Hias
That's probably the well known issue with interlaced video. See here for a fix LibreELEC (Leia) 9.2 ALPHA1 with Raspberry Pi 4B Support or wait for the next LE release (which should be available soon).
so long,
Hias
I don't remember a post on the Milhouse build thread either. The fix was included added in kernel 5.0.8 (and 4.19.35). I found this post though from Matt "Mr. Chromebox" Devo where he wrote that the network issue is fixed in LE 9.0.2 ChromeBox Kodi E-Z Setup Script (LibreELEC/Linux+Kodi) [2017/02/21]
I don't have any Chromeboxes myself, just remembered that the network issue came up numerous times in the Milhouse x86 thread.
so long,
Hias
I haven't tested composite out myself yet but others reported on the RPi forums that they had issues with composite, too Extremly Poor performance with tvout enabled - Raspberry Pi Forums
It's currently being looked into, could be that some firmware fix is needed.
so long,
Hias