kvmtool: processes inside vm hang in D state

Hello,

I hope it's the right mailinglist, if not I apologize.

I can see strange thing inside lkvm virtual machine. The processes stuck in the D state after some time (few days or few hours):

root@testvm:~# ps ax | grep D
  PID TTY      STAT   TIME COMMAND
   20 ?        D      0:00 [kworker/u4:1+xfs-cil/vda1]
 1072 ?        D      0:00 [xfsaild/vda1]
 3237 ?        D      0:00 [kworker/0:1+xfs-sync/vda1]
 3309 ?        D      0:00 [kworker/u4:0+flush-254:0]
 3461 pts/0    S+     0:00 grep D

After that the vm is unusable.

I tested differrent filesystem, different distributions with the same
result (latest kvmtool git: https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git)

Is there any way how to debug it ?

Many thanks.

Best regards.

Please cc me, I am not a member.

Milan Kocian