Hello, As a variant to fix this issue, please consider using attached patch. Hope, it's simple enough to be accepted upstream.
On nonzero mismatch_cnt it makes log entry like this:
-->8---
Dec 6 22:52:42 squeeze mdadm[2376]: RebuildFinished event detected on md
device /dev/md0, component device mismatches found: 128 (on raid level 1)
---->8--
Thus, you can filter this out in logcheck rules _only_ for raid1/raid10:
----->8----
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ mdadm(\[[[:digit:]]+\])?:
Rebuild((Start|Finish)ed|[[:digit:]]+) event detected on md device
/dev/[-_./[:alnum:]]+, component device mismatches found: [0-9]+ \(on raid
level (1|10)\)$
---->8---
This patch also can be useful for #588516.
report-level-on-rebuildfinished.diff
Description: Binary data
