Downgraded the server to Ubuntu 14.04.5: no issues with the following
kernel versions:

* linux-image-3.13.0-96-generic
* linux-image-4.2.0-42-generic

I am attaching some lines from dmesg where the "fault_state(0x265d)" is
present but does not lead to I/O errors or filesystems mounted read
only: even under high load the system behaves normally.

As stated before I am unable to run apport-collect (or any other
command) after that I/O errors have been noticed.

** Attachment added: "Behaviour with kernel 4.2.0 on trusty"

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  I/O error after mpt2sas fault_state 0x265d

Status in linux package in Ubuntu:

Bug description:
  After a write intensive operation (like dd if=/dev/zero of=bigfile) an
  I/O error is issued and the filesystem is mounted read-only. Further
  read attempts from the storage result in more I/O errors.

  The RAID controller is a Dell/LSI SAS2008 FWVersion(,
  ChipRevision(0x03), BiosVersion( managing just one RAID10
  array with four disks.

  The following kernels have been tried and gave the same problem:

  * linux-image-4.4.0-36-generic
  * linux-image-4.7.4-040704-generic
  * linux-image-4.8.0-040800rc7-generic

  All disks are clean when inspected with smartctl.

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