I've made some tests meanwhile with the latest 4.14 ubuntu kernel
package, but could not reproduce the bug with the tests under that
kernel so far, but that does not really and realiably mean anything,
because

- the kernel freeze occures occasionally only, therefore difficult to
prove the absence by a few tests.

- the machine needs zfs to use it's additional disks and I don't get the
zfs kernel modules with that 4.14 package, so it's unclear whether the
bug is somehow caused by zfs modules. Furthermore, I cannot test the
machine intensively (and under similar usage) without zfs.


To be comparable, the 4.14 kernel package would need to be compiled in the very 
same way as the 4.4 kernel that comes with 16.04.

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https://bugs.launchpad.net/bugs/1731693

Title:
  kernel crash/freeze during shutdown

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