ceph fs with backtrace damage

[Fyodor Ustinov <ufm@xxxxxx>]

Hi!

After MDS scrub I got error:
1 MDSs report damaged metadata

#ceph tell mds.0 damage ls 

[
    {
        "damage_type": "backtrace",
        "id": 712325338,
        "ino": 1099526730308,
        "path": "/erant/smb/public/docs/3. Zvity/1. Prodazhi/~$Data-center 2019.08.xlsx"
    },
    {
        "damage_type": "backtrace",
        "id": 1513472891,
        "ino": 1099526730309,
        "path": "/erant/smb/public/docs/3. Zvity/2. Menedzhery/2019/2019_09/Berezovskyh/Berezovskyh_2019_09_10.xlsx"
    }
]

What is a "backtrace" damage?
What caused it?
How to fix it?

Help me, please!

WBR,
    Fyodor.
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