From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Murphy <lists@colorremedies.com>
Subject: Re: Linux 5.5 Breaks Raid1 on Device instead of Partition, Unusable I/O
Date: Mon, 2 Mar 2020 00:08:11 -0700
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smart also reports for /de/sdc

  40 53 00 ff ff ff 0f  Error: UNC at LBA = 0x0fffffff = 268435455


So I'm suspicious of timeout mismatch as well.
https://raid.wiki.kernel.org/index.php/Timeout_Mismatch


Chris Murphy