[BUG] rbd hard lookup -> kernel crush by some crush maps

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Sorry list, i just can't find how send bugs to tracking system -_-

How reporduce:
1. Use crush rule
rule replicated_ruleset {
  ruleset 0
  type replicated
  min_size 1
  max_size 10
  step take default
  step choose firstn 0 type room
  step choose firstn 0 type rack
  step choose firstn 0 type host
  step chooseleaf firstn 0 type osd
  step emit
}
2. inject into cluster
3. do:
rbd map <rbd name>

crushtool passed test successful, but if you inject map into cluster
(i use 0.94.1)
All kernel rbd Clients who use rbd map, immadentely crush.
i don't know which kernel not affected, but i catch it with 4.0.1

With long stucktrace in kernel and message like "Hard lookup detected"
Sorry but i realy have a problems with find logs =_=



-- 
Have a nice day,
Timofey.
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