It seems that one of the following two steps solved the issue, at least
when using kernel 4.4.0:
* upgrading the disks (model ST9900805SS) firmware to version CS0C
(hosts equipped with different models of disks didn't seem to be
affected by this problem);
* adding "mpt3sas.msix_disable=1" to kernel boot parameters.
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I/O error after mpt2sas fault_state 0x265d
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