Upboard hangs on reboot

Tone

I've installed the new Ubuntu 20.04 with your custom kernel, but noticed that the upboard hangs everytime I reboot it.
I've already tried to add those lines in the blacklist.conf (https://wiki.up-community.org/Ubuntu_20.04#Hang_on_Shutdown_or_Reboot_for_UP_Board), but it doesn't work for me.
What else could I do?

Tone

I get this message over and over again:
BUG: soft lockup - CPU#0 stuck for 22s! [systemd-shutdow:1]

Laurent DOUCHY

Hi Tone,

I'm facing the same issue have you found a solution by any chance?

Tone

No.
I've tried that:
https://wiki.archlinux.org/index.php/UP_Board#Reboot_causing_kernel_panic
but it didn't work.

And found an older kernel bug:
https://lore.kernel.org/patchwork/patch/817189/
But the kernel from aaeon is based on 5.4. so it is already fixed.

I've no idea. If I google the log-message it's probably a kernel problem

Here the complete log:

Tone

@Laurent DOUCHY: is Ubuntu also your second partition?

Tone

It seems to be the blacklist didn't work.
Look at the "RIP" line. dw_dmac_core hangs.

But I already updated my blacklist:

/etc/modprobe.d/blacklist.conf

blacklist dw_dmac
blacklist dw_dmac_core
install dw_dmac /bin/true
install dw_dmac_core /bin/true

do i need to do anything else to make it update?

SOLUTION:
After updating the blacklist I had to rebuild the kernel (I think?) with

sudo update-initramfs -u

Why isn't this in the Wiki?

waynepiekarski

I'm using Ubuntu 18.04 with the custom 5.4 kernel, and also needed to edit blacklist.conf as well for rebooting to work properly. However, I did not need to do sudo update-initramfs, just rebooting was enough for the change to take effect.
https://github.com/up-board/up-community/wiki/Ubuntu_18.04#Hang_on_Shutdown_or_Reboot_for_UP_Board