On 9/26/20 1:55 AM, Christian Hewitt wrote:

I am using an ARM SBC device with Amlogic S922X chip (Beelink
GS-King-X, an Android STB) to boot the Kodi mediacentre distro
LibreELEC (which I work on) although the issue is also reproducible
with Manjaro and Armbian on the same hardware, and with the GT-King
and GT-King Pro devices from the same vendor - all three devices are
using a common dtsi:

https://github.com/chewitt/linux/blob/amlogic-5.9-integ/arch/arm64/boot/dts/amlogic/meson-g12b-gsking-x.dts
https://github.com/chewitt/linux/blob/amlogic-5.9-integ/arch/arm64/boot/dts/amlogic/meson-g12b-gtking-pro.dts
https://github.com/chewitt/linux/blob/amlogic-5.9-integ/arch/arm64/boot/dts/amlogic/meson-g12b-gtking.dts
https://github.com/chewitt/linux/blob/amlogic-5.9-integ/arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi

I have schematics for the devices, but can only share those privately
on request.

For testing I am booting LibreELEC from SD card. The box has a 4TB
SATA drive internally connected with a USB > SATA bridge, see dmesg:
http://ix.io/2yLh and I connect a USB stick with a 4GB ISO file that I
copy to the internal SATA drive. Within 10-20 seconds of starting the
copy the box deadlocks needing a hard power cycle to recover. The
timing of the deadlock is variable but the device _always_ deadlocks.
Although I am using a simple copy use-case, there are similar reports
in Armbian forums performing tasks like installs/updates that involve
I/O loads.

Following advice in the #linux-amlogic IRC channel I added
CONFIG_SOFTLOCKUP_DETECTOR and CONFIG_DETECT_HUNG_TASK and was able to
get output on the HDMI screen (it is not possible to connect to UART
pins without destroying the box case). If you advance the following
video frame by frame in VLC you can see the output:

https://www.dropbox.com/s/klvcizim8cs5lze/lockup_clip.mov?dl=0

Try with this patch:

https://lore.kernel.org/linux-block/20200925191902.543953-1-shakeelb@google.com/ (local)

-- 
Jens Axboe