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Description of problem:
The RHELSA7.3 kernel is missing these important fixes that have gone upstream since Linux 4.5 was released:
6acfe68 dm: fix excessive dm-mq context switching
4df2bf4 dm snapshot: disallow the COW and origin devices from being identical
2eae9e4 dm thin metadata: don't issue prefetches if a transaction abort has failed
d14fcf3 dm cache: make sure every metadata function checks fail_io
98dbc9c dm: fix rq_end_stats() NULL pointer in dm_requeue_original_request()
9567366 dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros
6545b60 dm cache metadata: fix cmd_read_lock() acquiring write lock
602d165 dm verity fec: fix block calculation
bd9f55e dm: fix second blk_delay_queue() parameter to be in msec units not jiffies
99f3c90 dm flakey: error READ bios during the down_interval
7d9595d dm rq: fix the starting and stopping of blk-mq queues
eaf9a73 dm: set DMF_SUSPENDED* _before_ clearing DMF_NOFLUSH_SUSPENDING
299f623 dm flakey: fix reads to be issued if drop_writes configured
It should be noted that this small set of stable.org patch is a subset of the much larger 150+ DM patches that RHELSA7.3 doesn't have.
This work is snow-balling... there is code in the 4.5 kernel that I am _not_ willing to support (specifically we need upstream commit c5248f79f39 ("dm: remove support for stacking dm-mq on .request_fn device(s)")). Getting that commit to apply will require more extensive backport work.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-2145.html