Bug#946195: Kernel 4.19 bug soft lookup CPU stuck

[Salvi Loris <salvi.loris@bsi.sm>]

    Package: linux-image-4.19.0-6-amd64

Version: 4.19.67-2+deb10u2

After i've upgraded some computers from stretch to buster i got strange CPU error when i switch on or off the machine.

This is the error i got:

systemd-journald[287]: Failed to send WATCHDOG=1 notification message: Connection refused.
rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 1-....: (5249 ticks this GP) idle=bce/1/0x40000000000000002 softirq=103055/103055 fqs=2374
rcu: (t=5250 jiffies g=179473 q=1)
watchdog: BUG: soft lookup - CPU#1 stuck for 22s! [systemd-shutdown:1]

    If this issue show up when i turn on the computer, i have to force
    the shutdown and turn on again (hoping it wouldn't show up again).
    
    If this issue show up when i turn off the machine, instead, it
    simply remains stucked until someone don't force the shut down.

I tried to change kernel to buster-backports linux-image-5.2.0-0.bpo.3-rt-amd64, this error disappeared but i got some issues with third party java's application.
So i tried to modify some kernel params:

sysctl -w kernel.watchdog_thresh=20
sysctl -w kernel.nmi_watchdog=0

and

echo blacklist sp5100_tco > /etc/modprobe.d/nmi-blacklist.conf

in /etc/default/grub i changed

GRUB_CMDLINE_LINUX_DEFAULT="nmi_watchdog=0 memory_corruption_check=0 quiet"

but nothing happened.

In the end, i was forced to install kernel 4.9 from stretch (4.9.0-11-amd64) and this error disappeared.

There is something i can try to fix this?

Thank you,

    Lori
  

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