------- Comment From <email address hidden> 2016-12-22 10:04 EDT-------
Thanks for all your help !
I updated the system with the kernel from -proposed.
uname -a output after the update :
Linux s38lp65 4.4.0-58-generic #79-Ubuntu SMP Tue Dec 20 12:14:19 UTC 2016 s390x s390x s390x GNU/Linux
Then I ran my test and found, that the problem is gone.
Thank you.
------- Comment From <email address hidden> 2016-12-22 10:04 EDT-------
Thanks for all your help !
I updated the system with the kernel from -proposed.
uname -a output after the update :
Linux s38lp65 4.4.0-58-generic #79-Ubuntu SMP Tue Dec 20 12:14:19 UTC 2016 s390x s390x s390x GNU/Linux
Then I ran my test and found, that the problem is gone.
Thank you.