> On 26 Sep 2020, at 4:28 pm, Christian Hewitt <christianshewitt@xxxxxxxxx> wrote: > >> >> On 26 Sep 2020, at 4:13 pm, Jens Axboe <axboe@xxxxxxxxx> wrote: >> >> On 9/26/20 5:55 AM, Christian Hewitt wrote: >>>> >>>> On 26 Sep 2020, at 2:51 pm, Jens Axboe <axboe@xxxxxxxxx> wrote: >>>> >>>> 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@xxxxxxxxxx/ >>> >>> It still locks up approx. 25 seconds into the copy operation. Here’s the output in video again (a little blurry): >>> >>> https://www.dropbox.com/s/3j2czaq509arg6g/lockup_clip2.mov?dl=0 >> >> Can you try and set CONFIG_SLUB in your .config instead of CONFIG_SLAB? > > CONFIG_SLUB is already set, here’s the full defconfig http://paste.ubuntu.com/p/5BNdZv6J3c/ > > # dmesg | grep -i slub > [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1 > >> Also, just take a picture, should be easier to get readable than a video. >> And the static trace is all that is needed. > > This is from a GT-King Pro which someone reminded me has a large RS232 port on the rear: > > https://pastebin.com/raw/sGtzgreN from 5.9—rc7 https://pastebin.com/raw/nbHJmrqe Christian
