Q: xfs_db: invalid numrecs (*) in bmapbtd block

[Timofey Titovets]

Good time of day list,
i do regular check fragmentation on my servers and xfs_db show strange erros:

# xfs_db -c frag -r /dev/sdc1
invalid numrecs (51914) in bmapbtd block
invalid numrecs (2827) in bmapbtd block
invalid numrecs (65419) in bmapbtd block
invalid numrecs (9047) in bmapbtd block
invalid numrecs (26469) in bmapbtd block
invalid numrecs (17784) in bmapbtd block
invalid numrecs (17784) in bmapbtd block
invalid numrecs (13240) in bmapbtd block
invalid numrecs (60489) in bmapbtd block
invalid numrecs (23478) in bmapbtd block
invalid numrecs (24767) in bmapbtd block
invalid numrecs (33180) in bmapbtd block
invalid numrecs (25257) in bmapbtd block
invalid numrecs (20648) in bmapbtd block
invalid numrecs (23136) in bmapbtd block
invalid numrecs (25282) in bmapbtd block
invalid numrecs (24743) in bmapbtd block
invalid numrecs (56229) in bmapbtd block
invalid numrecs (42902) in bmapbtd block
invalid numrecs (12316) in bmapbtd block
invalid numrecs (1588) in bmapbtd block
invalid numrecs (7065) in bmapbtd block
invalid numrecs (65280) in bmapbtd block
invalid numrecs (3378) in bmapbtd block
invalid numrecs (61507) in bmapbtd block
invalid numrecs (56024) in bmapbtd block
invalid numrecs (25390) in bmapbtd block
invalid numrecs (25942) in bmapbtd block
invalid numrecs (12134) in bmapbtd block
invalid numrecs (26991) in bmapbtd block
invalid numrecs (43528) in bmapbtd block
invalid numrecs (10265) in bmapbtd block
invalid numrecs (44698) in bmapbtd block
invalid numrecs (15937) in bmapbtd block
actual 504454, ideal 126776, fragmentation factor 74.87%

I already google error, and can't find any answer or explanation what
is it, how danger it or something like.
It's a production servers with several TB of data and this output make
me unhappy. =.=
And i can't do fast stop it, unmount and check file system.
(this is nfs server for virtual machines images)

Thanks for any help, anyway.
-- 
Have a nice day,
Timofey.