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We're seeing cpu livelocks in block shrinking where counters show that a single block cache shrink call is only getting EAGAIN from repeated rhashtable walk attempts. It occurred to me that the running task might be preventing an RCU grace period from ending by never blocking. The hope of this commit is that by waiting for rcu callbacks to run we'll ensure that any pending rebalance callback runs before we retry the rhashtable walk again. I haven't been able to reproduce this easily so this is a stab in the dark. Signed-off-by: Zach Brown <zab@versity.com>