Summary of Bug
Given the usage of panics down below 
in this code section
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iter := sdk.KVStoreReversePrefixIterator(store, stakingtypes.ValidatorsKey) |
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counter := int16(0) |
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for ; iter.Valid(); iter.Next() { |
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addr := sdk.ValAddress(iter.Key()[1:]) |
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validator, found := app.StakingKeeper.GetValidator(ctx, addr) |
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if !found { |
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panic("expected validator, not found") |
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} |
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validator.UnbondingHeight = 0 |
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if applyAllowedAddrs && !allowedAddrsMap[addr.String()] { |
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validator.Jailed = true |
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} |
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app.StakingKeeper.SetValidator(ctx, validator) |
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counter++ |
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} |
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iter.Close() |
, despite having an iter.Close() down at Line 174, it is important to use defer iter.Close() which will allow for clean up by closing the store and releasing resources