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? Also, just take a picture, should be easier to get readable than a video. And the static trace is all that is needed. -- Jens Axboe
