how to fix num_strays?

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Hi all,

Following some cephfs issues today we have a stable cluster but the
num_strays is incorrect.
After starting the mds, the values are reasonable, but they very soon
underflow and start showing 18E  (2^64 - a few)

---------------mds---------------- --mds_cache--- ------mds_log------
-mds_mem- ----mds_server----- mds_ ---objecter---
req  rlat fwd  inos caps exi  imi |stry recy recd|subm evts segs
repl|ino  dn  |hcr  hcs  hsr  cre |sess|actv rd   wr  |
129    0    0  253k 1.9k   0    0 |246    0    0 |  5  4.0k   5    0
|253k 254k|129    0    0    0 |119 |  3    1    2
8.2k   0    0  253k 1.9k   0    0 |129    0    0 |395  4.4k   7    0
|253k 254k|8.2k  11    0    0 |119 |  0   33  517
9.7k   0    0  253k 1.8k   0    0 |181    0    0 |302  4.7k   7    0
|253k 254k|9.7k   5    0    0 |119 |  1   44  297
 10k   0    0  253k 1.8k   0    0 |217    0    0 |382  5.1k   7    0
|253k 254k| 10k  11    0    0 |119 |  0   54  405
9.0k   0    0  253k 1.7k   0    0 |205    0    0 |386  5.5k   8    0
|253k 254k|9.0k   4    0    0 |119 |  1   46  431
8.2k   0    0  253k 1.7k   0    0 |161    0    0 |326  5.8k   8    0
|253k 254k|8.2k   6    0    0 |119 |  1   37  397
8.0k   0    0  253k 1.6k   0    0 |135    0    0 |279  6.1k   8    0
|253k 254k|8.0k   4    0    0 |119 |  1   31  317
9.2k   0    0  253k 1.6k   0    0 | 18E   0    0 |153  6.2k   8    0
|253k 254k|9.2k   6    0    0 |119 |  1    2  265
8.2k   0    0  253k 1.7k   0    0 | 18E   0    0 | 40  6.3k   8    0
|253k 254k|8.2k   5    0    0 |119 |  3    3   17

Is there a way to reset the num_strays to the correct number of strays ?

# for i in `seq 600 609`; do rados --cluster=dwight listomapvals -p
cephfs_metadata ${i}.00000000 2>&1 | wc -l; done
95
220
91
173
567
1578
1042
754
445
261

Cheers, Dan
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