NO NO NO!
DO NOT UPDATE your kernel!
The BUG is in "stable" while the FIX has yet to reach Linus.
DO NOT UPDATE your kernel!
It's (another) Neil Brown special in the software raid code.
It:
Only affects filesystems on software raid (md/raid0) on SSD
Probably affects other filesystems.
First appeared in a "bugfix" patch committed in April and has been percolating down through the "stable" branches.
Is the consequence of a misdirected DISCARD instruction and can be avoided by disabling discard/trim or DOWNGRADING the kernel.
DO NOT UPDATE your kernel!